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Review

Computational Structural Biology: Successes, Future Directions, and Challenges

by
Ruth Nussinov
1,2,*,
Chung-Jung Tsai
1,
Amarda Shehu
3 and
Hyunbum Jang
1
1
Computational Structural Biology Section, Basic Science Program, Frederick National Laboratory for Cancer Research, Frederick, MD 21702, USA
2
Sackler Institute of Molecular Medicine, Department of Human Genetics and Molecular Medicine, Sackler School of Medicine, Tel Aviv University, Tel Aviv 69978, Israel
3
Departments of Computer Science, Department of Bioengineering, and School of Systems Biology, George Mason University, Fairfax, VA 22030, USA
*
Author to whom correspondence should be addressed.
Molecules 2019, 24(3), 637; https://doi.org/10.3390/molecules24030637
Submission received: 11 January 2019 / Revised: 5 February 2019 / Accepted: 10 February 2019 / Published: 12 February 2019
(This article belongs to the Special Issue Selected Papers from the 11th Computational Structural Bioinformatics Workshop (CSBW-2018))
Review Reports Versions Notes

Abstract

:
Computational biology has made powerful advances. Among these, trends in human health have been uncovered through heterogeneous ‘big data’ integration, and disease-associated genes were identified and classified. Along a different front, the dynamic organization of chromatin is being elucidated to gain insight into the fundamental question of genome regulation. Powerful conformational sampling methods have also been developed to yield a detailed molecular view of cellular processes. when combining these methods with the advancements in the modeling of supramolecular assemblies, including those at the membrane, we are finally able to get a glimpse into how cells’ actions are regulated. Perhaps most intriguingly, a major thrust is on to decipher the mystery of how the brain is coded. Here, we aim to provide a broad, yet concise, sketch of modern aspects of computational biology, with a special focus on computational structural biology. We attempt to forecast the areas that computational structural biology will embrace in the future and the challenges that it may face. We skirt details, highlight successes, note failures, and map directions.

1. Introduction

Computational biology has made vast strides. Rather than being a ‘second fiddle’ to experiments, it now often leads research. When the number of candidate experimental targets is daunting, computational biology can come to the rescue to filter, prioritize, and provide data-based hypotheses and leads. Vast and heterogeneous data are increasingly accessible, and computational biology can efficiently integrate these diverse information-rich resources, evaluate, and interpret the outcomes [1,2]. With massive genomic, transcriptomic, and proteomic data, as well as structural foot printing, computational biology has also made great strides toward a more reliable multiscale biological modeling [3]. In addition, it has developed software for inferring molecular interactions and assembling them into interconnected cellular pathways [4,5,6,7,8,9,10,11]. Steps have also been taken toward the modeling of cells, gearing to blend molecular, cryo-electron microscopy (cryo-EM), cryo-electron tomography (cryo-ET), cellular, and systems/human scales [12,13,14,15,16] and to facilitate in situ structural biology studies on a proteomic scale [17]. Inspired by Da Vinci’s imagination, a symposium has even been organized on modeling and imaging the whole human body at the atomic scale to understand the human body (https://dornsife.usc.edu/bridge-at-usc-bak/da-vinci-symposium/). Computational biology has successfully identified disease-linked genes [18,19,20] and harnessed artificial intelligence neuron connectivity and electrical flow to model the brain. The sequencing of individuals has permitted comparisons of corresponding sequences in diseased and healthy tissues, and with the help of computational biology, technological advances have accomplished the imaging and tracking of molecules in action in single cells [21,22,23]. Network science has prospered and become widely used [24] in applications ranging from signaling networks in the cell to those regarding protein molecules in allosteric communications [25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44]. Compelling advances have also been made in modeling protein and RNA structures and in mapping chromatin and its dynamics at high resolution [45,46,47,48,49,50,51,52]. These advances are compelling since, despite the high-throughput data, understanding cell signaling networks is listed among the top unanswered questions of modern science. Computational biology has also taken up the complexity of diseases to understand their mechanisms, systemic behaviors, and linkages within an organism as well as epidemiology across populations. Computational and mathematical modeling of complex biological systems has flourished [53,54], and impressive progress has been made in synthesis and nanobiology. As a result, now computational biology is spearheading microbiome research. All this has been possible thanks to the vast advances in computing power (albeit still not enough) and machine architectures. Recently, we have commented on the advancements and challenges in computational biology [2,55]. As the references above indicate, the last 4–5 years have already seen shifts and giant leaps forward, especially with respect to the harnessing of big data and machine intelligence [56].
In line with the aim of this Special Issue, here, we focus on computational structural biology. It is convenient for scientists to consider biological molecules in terms of their sequences. Such a simplification bypasses the challenge of reliably modeling their structures on a large scale under diverse conditions and accounting for their function-related fluctuations. However, in reality, no molecule exists in the cell as a mere string with covalently linked chemical blocks. Biological macromolecules fold as they are being synthesized either into stable three-dimensional shapes or into multiple interconverting states to populate an ensemble of ‘intrinsically disordered’ states [57,58,59]. Thus, computational structural biology that considers these states—which are what the cell ‘sees’—is of fundamental importance, even though, sometimes, shoved to the sidelines to permit simplification and faster analysis. Here, our discussion initiates with computational biology and then moves on to computational structural biology, formulating what we perceive could be its directions in the future.

2. The Breadth of Computational Biology

Bob Murphy, the head of the Computational Biology Department at Carnegie Melon University (http://www.cbd.cmu.edu/about-us/what-is-computational-biology/), frames computational biology by asking the broad question of how to “learn and use models of biological systems constructed from experimental measurements”. The aim is not necessarily to increase the understanding of the system, which may be so complex that it may not be fully understood or predicted; instead, the aim can be the creation of the model itself, even if currently unproven. Nevertheless, as scientists, our quest is always to understand.
Areas encompassed by computational biology depend on the specific goals and the types of experimental data that are available, including sequence and structural analysis [60,61] and their correlation with function [62], evolution and population genomics, regulatory [63] and metabolic networks [64], image analysis [65], and disease [66]. Computational biology often addresses tasks by analyzing large genomic [67,68,69,70,71], proteomic, microarray, cell and tissue imaging, and clinical data [72,73] to produce robust statistical trends and correlate these with outcomes. It harnesses high-throughput genomic and proteomic methods to integrate data [74], to identify and validate biomarkers and novel therapeutic targets, and to rapidly translate the findings to the clinic. Recently, it has also made great strides in assembling many different data types, revolutionizing the impact and power of biological information [75]. Statistics reflect trends and correlations in the population. However, because the number of entries is limited, statistics are not able to provide a detailed description including co-occurrences of multiple features for an individual entity; thus, statistics are unable to explain trends and observed biases [76], which may restrict the predictive power for individual patients [77]. To understand observations, there is a need to look at individual molecules or cells. At the other end of the spectrum are experimental approaches, which are often less quantitative and less detailed. Typically, studies deal with molecules, pathways, cells, and tissues. Crystal structures, and recently their cryo-EM images, are often presented; however, their ensembles are often overlooked, as are considerations of how different environmental conditions affect conformational distributions, which in turn determine the molecular functions.

3. The Quest to Understand the Molecular Mechanisms

A structural biology approach is based on the free-energy landscape. “Population shift”, or the redistribution of the conformational substates in the ensemble, links basic physicochemical principles to physiological functions and dysfunctions in disease [78]. This conformational view forms the basis for many computational structural biology projects, leading to their distinctiveness and to conceptual innovative advances. Computational structural biology can be harnessed to reveal the mechanisms of mutations and signaling specificity [79]. The outcome illustrates that computational structural biology may reach a level of mechanistic detail that is hard or impossible for experiments or nonstructural approaches to attain. Cancer treatment decisions would benefit from marrying statistical analysis with genetic and the structural analyses. Together with experimental approaches, statistical ‘big data’, genetic, and clinical analyses, and fundamental theory, computational structural biology can help coin and establish new paradigms to elucidate the basis of cancer and innovate treatments.
Computational biologists are driven by a fundamental ‘quest to understand.’ They exploit ‘big data’ and statistical trends for leads and search the experimental literature for functional observations. When possible, they cross-feed with experimental collaborators. This approach spawns more robust prediction schemes and allows reconciling experimental observations. It additionally leads to deeper understanding and innovative ideas, such as, for instance, the role of calmodulin in phosphatidylinositol-4,5-bisphosphate 3-kinase α (PI3Kα) activation in oncogenic KRas signaling and signaling selectivity at the membrane [35,80,81,82,83]. The structural view also underlies innovative interface-based pathogen–host protein interaction prediction methods [84]. Distinct from others, the approach in reference [58] is not based on the protein sequence nor on its entire structure, but on binding interfaces, which adopt favored motif architectures. This focus also guides studies of pathogen target-specific recognition, as well as other projects, including allostery in the T cell receptor (TCR)–CD3 complex (with crystallographers/NMR collaborators [85]), amyloid seeding [86], and recognition by homologous antibodies [87]. Other examples include elucidating the conformational heterogeneity of the ATP-binding cassette (ABC) transporter and its functional relevance [88], the crystal structure of the C2 domain of PI3Kα in complex with the phosphoinositide head-group mimic inositol hexaphosphate, revealing two distinct pockets for membrane binding [89] and a replacement of moieties inducing a molecular switch which transforms the molecule from a negative allosteric modulator of a receptor into an activator of Wnt signaling [90]. Additional examples with strong wet-lab components include disulfide tethering of a non-natural cysteine (KRasM72C) identifying a new Switch-II pocket binding ligand (2C07) of the active GTP-bound state, transforming the pocket to that observed in the GDP-bound state [91], and experimentally confirming that KRas populates conformational states different from its isoform HRas and the oncogenic mutant KRasG12D [92], as can be expected considering that the sequences are not identical. Further examples that combine experiments with computations include uncovering the isoform-specific signatures in Ras interactions [93], redefining the protein kinase conformational space with machine learning [94], developing covalent inhibitors of epidermal growth factor receptor (EGFR) [95], proposing c-Jun N-terminal kinase (JNK) signaling as a therapeutic target for Alzheimer’s disease [96,97], describing bacterial Ras/Rap1 site-specific endopeptidase cleavage of Ras disrupting Ras/extracellular signal-regulated kinase (ERK) signaling through an atypical mechanism [98], and finally, the remarkable observation of the biased antagonism of the CXC chemokine receptor type 4 (CXCR4) [99]. Additional examples, not detailed here are described in other works [34,100,101,102,103,104,105,106,107,108,109,110,111].

4. Challenges in Computational Structural Biology

Intertwined with computational biology, computational structural biology has continued to chart its path. After 50–60 years, the problem of predicting the three-dimensional structures of proteins from their sequences remains unsolved. With the apparent stalling in the progress of the ‘true’ ab-initio folding from ‘first principles’, focus has shifted to three components in modeling algorithms: the energy function, the conformational search, and the model selection [112,113,114,115,116]. Great progress was reported recently by AlphaFold, a deep learning approach by Google’s DeepMind team that outperformed other teams for about half of the targets in the 2018 Critical Assessment on protein Structure Prediction (CASP) community-wide competition [117]. Yet, even the impressive performance of a two-year effort by Google’s dedicated team of AI and machine learning researchers failed on more than half the targets and considered, like most approaches, a narrow version of the structure prediction problem. To appreciate the narrow context, it should be noted that, broadly, computational structural biology deals with structures of biological macromolecules and their interactions not only with each other but also with water, ions, lipids, or small molecule effectors in solution or at (on or in) the membrane, and with the consequences of their modifications and mutations. Especially, computational structural biology aims to model and exploit the structural landscape to understand protein function and dysfunction by harnessing the active and inactive states and considering the shape of the free-energy landscape, identifying the conformations at its minima, the metastable states, and the barriers which need to be crossed to switch between the states [118,119,120,121,122]. It also considers how mutations and other events alter the landscape, by populating previously hidden states. Structural dynamics, which embraces fluctuations between states, is essential for functional elucidation. Any structure-based study needs to consider the complexity of the environment and its impact on the structural dynamics of any uncomplexed or complexed molecular system. This is no short order, even for the most sophisticated machine learning approaches.

5. Some Emerging Principles in Computational Structural Biology

Among the tenets that computational structural biology may increasingly embrace in the next few years are integrated deep neural networks, Markov state models, and metastable states for sampling conformational space, which will permit mining the entire free-energy landscape, thus providing insight into biological macromolecular actions, including catalysis [123,124,125,126,127,128,129] and dynamic networks [130]. Other topics of interest are integrative or hybrid modeling across disparate scales [131,132,133,134,135,136], including organelles, cells, and tissues, and archiving of the models [137]; harnessing machine intelligence to extract trends and predict outcomes; making headway in precision medicine [138,139]; improving software for imaging technologies and analysis and unveiling the mechanisms, on the structural level, through which the microbiota can hijack host signaling and impact human health. Finally, integration with experimental structural data, such as cryo-EM and spectroscopy at different scales, are emerging as key to the successful modeling of multimolecular assemblies [3].
There are also older topics which are still awaiting a solution. A central problem in molecular dynamics simulations is that it is not possible yet to compute the free energy from standard simulations (i.e. from end-point simulations). Even enhanced sampling methods providing free-energy landscape are not able to dissect the contributions to free energy. Similar to other free-energy methods, these are very slow. Entropy can be now accurately addressed for solutes by the kth nearest-neighbor and maximum information spanning tree method, but still, solvation entropy is not computable from standard simulations. Implicit solvent methods could play an important role in this field. Indeed, with more refined solvation models, several proteins could be correctly folded (as shown by the Simmerling group [140,141]). Free-energy calculations are a vastly important and challenging open problem. Much effort has also been invested in forcefield development, but there is still much room for further improvement.

6. Areas that May Take the Center Stage

Below, we list some of the areas that we foresee as taking the center stage and gaining momentum in the next years. In many, machine intelligence and an increasing level of automation are expected to become methodological requisites. In particular, we posit that a combination of deep neural networks (DNN) and Markov state models (MSM) is applicable to most of the topics on the list:
(a)
Modeling large molecular assemblies and critically figuring out their assembly–disassembly processes in the cell to regulate its functions
(b)
Modeling chromatin structure and dynamics and, especially, figuring out their regulation
(c)
Regulation of signaling in key protein nodes and between them in the cell
(d)
Modeling and prediction of drug resistance
(e)
Integration of experimental statistical ‘big data’ and the structural landscapes to model cells (tissues) behavior and system complexity
(f)
Precision medicine, to identify and predict drug targets, and drug discovery
(g)
Figuring out how the microbiota hijacks cell signaling and cell response to infection
(h)
Efficient sampling of the conformational space
(i)
Modeling across scales
(j)
Figuring out molecular mechanisms in detail and how these are commandeered by mutations in disease
(k)
Untangling redundant signaling pathways in the cell
(l)
Designing functional molecules and cells
(m)
Generating detailed, high-fidelity, synthetic biological data in silico to test hypotheses and advance model building, testing, and biological knowledge.

7. Conclusions

Bioinformatics is undergoing a revolution. Traditional statistical approaches increasingly give way to advanced algorithms. Advances in machine learning have been shown capable of representing potential-energy surfaces by fitting large data sets from electronic structure calculations [142], and a ‘Machine Learning in Health and Biomedicine’ collection was conjointly published in PLOS Medicine, PLOS Computational Biology, PLOS ONE (https://collections.plos.org/mlforhealth), and other journals [143], illustrating the usefulness and diversity in bioinformatics’ applications toward improving human health. This is coupled to the vast increase in the generation of data and computational power, without which machine learning cannot be reliably executed. Machine learning-based methods are powerful, and their comparisons with the more traditional strategies illustrate their advantages. Are these going to replace the traditional approaches? Biology has long strived to shift from a descriptive to a quantitative science. However, the increasing availability of data—due to automation in experimental approaches—is leading to a paradigm shift in computational biology, forcefully pushing biology not only from a descriptive to a quantitative science but also from a descriptive to an automated science.
Nonetheless, the hallmarks have not changed. The key is to solve the questions that are still unanswered. The quest is to understand observations at the detailed level and to predict them. The paradigm underlying computational structural biology argues that to truly understand, one must have knowledge of the structure. Computational structural biology is a vast field. In this review, large areas of research are only sketched, and some are altogether missing. Our aim is to indicate highly important tasks that can be addressed by structural modeling and simulation and can thus be inspiring for the readers. Examples are provided to show that the methods and computational power are (and will be more and more) adequate for the tasks listed.

Funding

This project has been funded in whole or in part with federal funds from the National Cancer Institute, National Institutes of Health, under contract number HHSN261200800001E. This research was supported by the National Science Foundation Grant Nos. 1763233 and 1821154 and a Jeffress Memorial Trust Award to AS. The content of this publication does not necessarily reflect the views or policies of the Department of Health and Human Services, nor does mention of trade names, commercial products, or organizations imply endorsement by the U.S. Government. This research was supported [in part] by the Intramural Research Program of the NIH, National Cancer Institute, Center for Cancer Research.

Conflicts of Interest

The authors declare no conflict of interest.

References

  1. Jakobsson, E. The Top Ten Advances of the Last Decade & The Top Ten Challenges of the Next Decade. Biomed. Comput. Rev. 2005, 1, 11–15. [Google Scholar]
  2. Nussinov, R. Advancements and challenges in computational biology. PLoS Comput. Biol. 2015, 11, e1004053. [Google Scholar] [CrossRef] [PubMed]
  3. Ozdemir, E.S.; Nussinov, R.; Gursoy, A.; Keskin, O. Developments in integrative modeling with dynamical interfaces. Curr. Opin. Struct. Biol. 2018, 56, 11–17. [Google Scholar] [CrossRef] [PubMed]
  4. Dimura, M.; Peulen, T.O.; Hanke, C.A.; Prakash, A.; Gohlke, H.; Seidel, C.A. Quantitative FRET studies and integrative modeling unravel the structure and dynamics of biomolecular systems. Curr. Opin. Struct. Biol. 2016, 40, 163–185. [Google Scholar] [CrossRef]
  5. Gaalswyk, K.; Muniyat, M.I.; MacCallum, J.L. The emerging role of physical modeling in the future of structure determination. Curr. Opin. Struct. Biol. 2018, 49, 145–153. [Google Scholar] [CrossRef] [PubMed]
  6. Webb, B.; Viswanath, S.; Bonomi, M.; Pellarin, R.; Greenberg, C.H.; Saltzberg, D.; Sali, A. Integrative structure modeling with the Integrative Modeling Platform. Protein Sci. 2018, 27, 245–258. [Google Scholar] [CrossRef]
  7. Russel, D.; Lasker, K.; Webb, B.; Velazquez-Muriel, J.; Tjioe, E.; Schneidman-Duhovny, D.; Peterson, B.; Sali, A. Putting the pieces together: Integrative modeling platform software for structure determination of macromolecular assemblies. PLoS Biol. 2012, 10, e1001244. [Google Scholar] [CrossRef] [PubMed]
  8. Baspinar, A.; Cukuroglu, E.; Nussinov, R.; Keskin, O.; Gursoy, A. PRISM: A web server and repository for prediction of protein-protein interactions and modeling their 3D complexes. Nucleic Acids Res. 2014, 42, W285–W289. [Google Scholar] [CrossRef]
  9. Kuzu, G.; Keskin, O.; Nussinov, R.; Gursoy, A. PRISM-EM: Template interface-based modelling of multi-protein complexes guided by cryo-electron microscopy density maps. Acta Crystallogr. D Struct. Biol. 2016, 72, 1137–1148. [Google Scholar] [CrossRef]
  10. Tyagi, M.; Hashimoto, K.; Shoemaker, B.A.; Wuchty, S.; Panchenko, A.R. Large-scale mapping of human protein interactome using structural complexes. EMBO Rep. 2012, 13, 266–271. [Google Scholar] [CrossRef] [Green Version]
  11. Frank, J. Time-resolved cryo-electron microscopy: Recent progress. J. Struct. Biol. 2017, 200, 303–306. [Google Scholar] [CrossRef] [PubMed]
  12. Szigeti, B.; Roth, Y.D.; Sekar, J.A.P.; Goldberg, A.P.; Pochiraju, S.C.; Karr, J.R. A blueprint for human whole-cell modeling. Curr. Opin. Syst. Biol. 2018, 7, 8–15. [Google Scholar] [CrossRef] [PubMed]
  13. Resasco, D.C.; Gao, F.; Morgan, F.; Novak, I.L.; Schaff, J.C.; Slepchenko, B.M. Virtual Cell: Computational tools for modeling in cell biology. Wiley Interdiscip Rev. Syst. Biol. Med. 2012, 4, 129–140. [Google Scholar] [CrossRef] [PubMed]
  14. Cowan, A.E.; Moraru, I.I.; Schaff, J.C.; Slepchenko, B.M.; Loew, L.M. Spatial modeling of cell signaling networks. Methods Cell Biol. 2012, 110, 195–221. [Google Scholar] [PubMed]
  15. Thurley, K.; Wu, L.F.; Altschuler, S.J. Modeling Cell-to-Cell Communication Networks Using Response-Time Distributions. Cell Syst. 2018, 6, 355–367. [Google Scholar] [CrossRef]
  16. Engblom, S.; Wilson, D.B.; Baker, R.E. Scalable population-level modelling of biological cells incorporating mechanics and kinetics in continuous time. Royal Soc. Open Sci. 2018, 5, 180379. [Google Scholar] [CrossRef]
  17. Doerr, A. Cryo-electron tomography. Nat. Methods 2017, 14, 34. [Google Scholar] [CrossRef]
  18. Lant, J.T.; Berg, M.D.; Heinemann, I.U.; Brandl, C.J.; O′Donoghue, P. Pathways to disease from natural variations in human cytoplasmic tRNAs. J. Biol. Chem. 2019. [Google Scholar] [CrossRef]
  19. Hwang, S.; Kim, C.Y.; Yang, S.; Kim, E.; Hart, T.; Marcotte, E.M.; Lee, I. HumanNet v2: Human gene networks for disease research. Nucleic Acids Res. 2019, 47, D573–D580. [Google Scholar] [CrossRef]
  20. Kim, M.J.; Deng, H.X.; Wong, Y.C.; Siddique, T.; Krainc, D. The Parkinson′s disease-linked protein TMEM230 is required for Rab8a-mediated secretory vesicle trafficking and retromer trafficking. Hum. Mol. Genet. 2017, 26, 729–741. [Google Scholar]
  21. Muller, T.G.; Sakin, V.; Muller, B. A Spotlight on Viruses-Application of Click Chemistry to Visualize Virus-Cell Interactions. Molecules 2019, 24, 481. [Google Scholar] [CrossRef] [PubMed]
  22. Hattab, G.; Wiesmann, V.; Becker, A.; Munzner, T.; Nattkemper, T.W. A Novel Methodology for Characterizing Cell Subpopulations in Automated Time-lapse Microscopy. Front. Bioeng. Biotechnol. 2018, 6, 17. [Google Scholar] [CrossRef] [PubMed]
  23. Yang, S.J.; Berndl, M.; Michael Ando, D.; Barch, M.; Narayanaswamy, A.; Christiansen, E.; Hoyer, S.; Roat, C.; Hung, J.; Rueden, C.T.; et al. Assessing microscope image focus quality with deep learning. BMC Bioinformatics 2018, 19, 77. [Google Scholar] [CrossRef] [PubMed]
  24. Ideker, T.; Nussinov, R. Network approaches and applications in biology. PLoS Comput. Biol. 2017, 13, e1005771. [Google Scholar] [CrossRef]
  25. Tsai, C.J.; Nussinov, R. Allosteric activation of RAF in the MAPK signaling pathway. Curr. Opin. Struct. Biol. 2018, 53, 100–106. [Google Scholar] [CrossRef]
  26. Paul, M.D.; Hristova, K. The RTK Interactome: Overview and Perspective on RTK Heterointeractions. Chem. Rev. 2018. [Google Scholar] [CrossRef] [PubMed]
  27. Nussinov, R.; Zhang, M.; Tsai, C.J.; Liao, T.J.; Fushman, D.; Jang, H. Autoinhibition in Ras effectors Raf, PI3Kα, and RASSF5: A comprehensive review underscoring the challenges in pharmacological intervention. Biophys. Rev. 2018, 10, 1263–1282. [Google Scholar] [CrossRef]
  28. Vieira, M.S.; Goulart, V.A.M.; Parreira, R.C.; Oliveira-Lima, O.C.; Glaser, T.; Naaldijk, Y.M.; Ferrer, A.; Savanur, V.H.; Reyes, P.A.; Sandiford, O.; et al. Decoding Epigenetic Cell Signaling in Neuronal Differentiation. Semin. Cell Dev. Biol. 2018. [Google Scholar] [CrossRef] [PubMed]
  29. Verkhivker, G.M. Biophysical simulations and structure-based modeling of residue interaction networks in the tumor suppressor proteins reveal functional role of cancer mutation hotspots in molecular communication. Biochim. Biophys. Acta Gen. Subj. 2019, 1863, 210–225. [Google Scholar] [CrossRef] [PubMed]
  30. Pantsar, T.; Rissanen, S.; Dauch, D.; Laitinen, T.; Vattulainen, I.; Poso, A. Assessment of mutation probabilities of KRAS G12 missense mutants and their long-timescale dynamics by atomistic molecular simulations and Markov state modeling. PLoS Comput. Biol. 2018, 14, e1006458. [Google Scholar] [CrossRef] [PubMed]
  31. Liu, L.; Fan, S.; Li, W.; Tao, W.; Shi, T.; Zhao, Y.L. Theoretical Investigation of the Structural Characteristics in Active State of Akt1 Kinase. J. Chem. Inf. Model. 2018. [Google Scholar] [CrossRef]
  32. Cheng, F.; Nussinov, R. KRAS Activating Signaling Triggers Arteriovenous Malformations. Trends Biochem. Sci. 2018, 43, 481–483. [Google Scholar] [CrossRef] [PubMed]
  33. Hong, L.; Li, Y.; Liu, Q.; Chen, Q.; Chen, L.; Zhou, D. The Hippo Signaling Pathway in Regenerative Medicine. Methods Mol. Biol. 2019, 1893, 353–370. [Google Scholar] [PubMed]
  34. Li, S.; Jang, H.; Zhang, J.; Nussinov, R. Raf-1 Cysteine-Rich Domain Increases the Affinity of K-Ras/Raf at the Membrane, Promoting MAPK Signaling. Structure 2018, 26, 513–525. [Google Scholar] [CrossRef] [PubMed]
  35. Nussinov, R.; Tsai, C.J.; Jang, H. Oncogenic Ras Isoforms Signaling Specificity at the Membrane. Cancer Res. 2018, 78, 593–602. [Google Scholar] [CrossRef]
  36. Zhou, H.; Dong, Z.; Tao, P. Recognition of protein allosteric states and residues: Machine learning approaches. J. Comput. Chem. 2018, 39, 1481–1490. [Google Scholar] [CrossRef] [PubMed]
  37. Guven-Maiorov, E.; Tsai, C.J.; Nussinov, R. Structural host-microbiota interaction networks. PLoS Comput. Biol. 2017, 13, e1005579. [Google Scholar] [CrossRef]
  38. Nussinov, R.; Jang, H.; Tsai, C.J.; Liao, T.J.; Li, S.; Fushman, D.; Zhang, J. Intrinsic protein disorder in oncogenic KRAS signaling. Cell. Mol. Life Sci. 2017, 74, 3245–3261. [Google Scholar] [CrossRef]
  39. Guven-Maiorov, E.; Keskin, O.; Gursoy, A.; VanWaes, C.; Chen, Z.; Tsai, C.J.; Nussinov, R. The Architecture of the TIR Domain Signalosome in the Toll-like Receptor-4 Signaling Pathway. Sci. Rep. 2015, 5, 13128. [Google Scholar] [CrossRef] [Green Version]
  40. Csermely, P.; Korcsmaros, T.; Nussinov, R. Intracellular and intercellular signaling networks in cancer initiation, development and precision anti-cancer therapy: RAS acts as contextual signaling hub. Semin. Cell Dev. Biol. 2016, 58, 55–59. [Google Scholar] [CrossRef]
  41. Trivedi, S.; Starz-Gaiano, M. Drosophila Jak/STAT Signaling: Regulation and Relevance in Human Cancer and Metastasis. Int. J. Mol. Sci. 2018, 19, 4056. [Google Scholar] [CrossRef] [PubMed]
  42. Nussinov, R.; Tsai, C.J. The Role of Allostery in the Termination of Second Messenger Signaling. Biophys. J. 2015, 109, 1080–1081. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  43. Capriotti, E.; Ozturk, K.; Carter, H. Integrating molecular networks with genetic variant interpretation for precision medicine. Wiley Interdiscip. Rev. Syst. Biol. Med. 2018, 12, e1443. [Google Scholar] [CrossRef] [PubMed]
  44. Chavan, T.S.; Muratcioglu, S.; Marszalek, R.; Jang, H.; Keskin, O.; Gursoy, A.; Nussinov, R.; Gaponenko, V. Plasma membrane regulates Ras signaling networks. Cell Logist. 2015, 5, e1136374. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  45. Nishiyama, T. Cohesion and cohesin-dependent chromatin organization. Curr. Opin. Cell Biol. 2018, 58, 8–14. [Google Scholar] [CrossRef] [PubMed]
  46. Zhou, K.; Gaullier, G.; Luger, K. Nucleosome structure and dynamics are coming of age. Nat. Struct. Mol. Biol. 2018. [Google Scholar] [CrossRef] [PubMed]
  47. Fu, I.; Smith, D.J.; Broyde, S. Rotational and translational positions determine the structural and dynamic impact of a single ribonucleotide incorporated in the nucleosome. DNA Repair (Amst.) 2019, 73, 155–163. [Google Scholar] [CrossRef]
  48. Di Pierro, M.; Cheng, R.R.; Lieberman Aiden, E.; Wolynes, P.G.; Onuchic, J.N. De novo prediction of human chromosome structures: Epigenetic marking patterns encode genome architecture. Proc. Natl. Acad Sci. USA 2017, 114, 12126–12131. [Google Scholar] [CrossRef] [Green Version]
  49. Di Pierro, M.; Zhang, B.; Aiden, E.L.; Wolynes, P.G.; Onuchic, J.N. Transferable model for chromosome architecture. Proc. Natl. Acad. Sci. USA 2016, 113, 12168–12173. [Google Scholar] [CrossRef]
  50. Gursoy, G.; Xu, Y.; Kenter, A.L.; Liang, J. Computational construction of 3D chromatin ensembles and prediction of functional interactions of alpha-globin locus from 5C data. Nucleic Acids Res. 2017, 45, 11547–11558. [Google Scholar] [CrossRef] [Green Version]
  51. Weiner, A.; Hsieh, T.H.; Appleboim, A.; Chen, H.V.; Rahat, A.; Amit, I.; Rando, O.J.; Friedman, N. High-resolution chromatin dynamics during a yeast stress response. Mol. Cell 2015, 58, 371–386. [Google Scholar] [CrossRef] [PubMed]
  52. Gursoy, G.; Xu, Y.; Kenter, A.L.; Liang, J. Spatial confinement is a major determinant of the folding landscape of human chromosomes. Nucleic Acids Res. 2014, 42, 8223–8230. [Google Scholar] [CrossRef] [PubMed]
  53. Erez, A.; Vogel, R.; Mugler, A.; Belmonte, A.; Altan-Bonnet, G. Modeling of cytometry data in logarithmic space: When is a bimodal distribution not bimodal? Cytometry A 2018, 93, 611–619. [Google Scholar] [CrossRef]
  54. Angelin-Bonnet, O.; Biggs, P.J.; Vignes, M. Gene Regulatory Networks: A Primer in Biological Processes and Statistical Modelling. Methods Mol. Biol. 2019, 1883, 347–383. [Google Scholar] [PubMed]
  55. Nussinov, R. A top 12 list for Biocomputing. A decade of progress and challenges ahead. Biomed. Comput. Rev. 2014, 1, 17–22. [Google Scholar]
  56. Zitnik, M.; Nguyen, F.; Wang, B.; Leskovec, J.; Goldenberg, A.; Hoffman, M.M. Machine Learning for Integrating Data in Biology and Medicine: Principles, Practice, and Opportunities. Inf. Fusion 2019, 50, 71–91. [Google Scholar] [CrossRef] [PubMed]
  57. Fuxreiter, M. Towards a Stochastic Paradigm: From Fuzzy Ensembles to Cellular Functions. Molecules 2018, 23, 3008. [Google Scholar] [CrossRef] [PubMed]
  58. Wei, G.; Xi, W.; Nussinov, R.; Ma, B. Protein Ensembles: How Does Nature Harness Thermodynamic Fluctuations for Life? The Diverse Functional Roles of Conformational Ensembles in the Cell. Chem. Rev. 2016, 116, 6516–6551. [Google Scholar] [CrossRef] [PubMed]
  59. Papaleo, E.; Saladino, G.; Lambrughi, M.; Lindorff-Larsen, K.; Gervasio, F.L.; Nussinov, R. The Role of Protein Loops and Linkers in Conformational Dynamics and Allostery. Chem. Rev. 2016, 116, 6391–6423. [Google Scholar] [CrossRef] [Green Version]
  60. Mason, S.; Chen, B.Y.; Jagodzinski, F. Exploring Protein Cavities through Rigidity Analysis. Molecules 2018, 23, 351. [Google Scholar] [CrossRef]
  61. Chen, B.Y. VASP-E: Specificity annotation with a volumetric analysis of electrostatic isopotentials. PLoS Comput. Biol. 2014, 10, e1003792. [Google Scholar] [CrossRef] [PubMed]
  62. Bignon, E.; Allega, M.F.; Lucchetta, M.; Tiberti, M.; Papaleo, E. Computational Structural Biology of S-nitrosylation of Cancer Targets. Front. Oncol. 2018, 8, 272. [Google Scholar] [CrossRef] [PubMed]
  63. Cosin-Tomas, M.; Alvarez-Lopez, M.J.; Companys-Alemany, J.; Kaliman, P.; Gonzalez-Castillo, C.; Ortuno-Sahagun, D.; Pallas, M.; Grinan-Ferre, C. Temporal Integrative Analysis of mRNA and microRNAs Expression Profiles and Epigenetic Alterations in Female SAMP8, a Model of Age-Related Cognitive Decline. Front. Genet. 2018, 9, 596. [Google Scholar] [CrossRef] [PubMed]
  64. Aggarwal, S.; Gabrovsek, L.; Langeberg, L.K.; Golkowski, M.; Ong, S.E.; Smith, F.D.; Scott, J.D. Depletion of dAKAP1-protein kinase A signaling islands from the outer mitochondrial membrane alters breast cancer cell metabolism and motility. J. Biol. Chem. 2018. [Google Scholar] [CrossRef] [PubMed]
  65. Schwen, L.O.; Andersson, E.; Korski, K.; Weiss, N.; Haase, S.; Gaire, F.; Hahn, H.K.; Homeyer, A.; Grimm, O. Data-Driven Discovery of Immune Contexture Biomarkers. Front. Oncol. 2018, 8, 627. [Google Scholar] [CrossRef] [PubMed]
  66. Hu, J.X.; Helleberg, M.; Jensen, A.B.; Brunak, S.; Lundgren, J. A large-cohort, longitudinal study determines pre-cancer disease routes across different cancer types. Cancer Res. 2018. [Google Scholar] [CrossRef] [PubMed]
  67. Garud, N.R.; Good, B.H.; Hallatschek, O.; Pollard, K.S. Evolutionary dynamics of bacteria in the gut microbiome within and across hosts. PLoS Biol. 2019, 17, e3000102. [Google Scholar] [CrossRef]
  68. Hjelmso, M.H.; Mollerup, S.; Jensen, R.H.; Pietroni, C.; Lukjancenko, O.; Schultz, A.C.; Aarestrup, F.M.; Hansen, A.J. Metagenomic analysis of viruses in toilet waste from long distance flights-A new procedure for global infectious disease surveillance. PLoS ONE 2019, 14, e0210368. [Google Scholar] [CrossRef]
  69. Thissen, J.B.; Isshiki, M.; Jaing, C.; Nagao, Y.; Lebron Aldea, D.; Allen, J.E.; Izui, M.; Slezak, T.R.; Ishida, T.; Sano, T. A novel variant of torque teno virus 7 identified in patients with Kawasaki disease. PLoS ONE 2018, 13, e0209683. [Google Scholar] [CrossRef]
  70. Bradley, P.H.; Nayfach, S.; Pollard, K.S. Phylogeny-corrected identification of microbial gene families relevant to human gut colonization. PLoS Comput. Biol. 2018, 14, e1006242. [Google Scholar] [CrossRef]
  71. Higashi, K.; Suzuki, S.; Kurosawa, S.; Mori, H.; Kurokawa, K. Latent environment allocation of microbial community data. PLoS Comput. Biol. 2018, 14, e1006143. [Google Scholar] [CrossRef] [PubMed]
  72. Kidzinski, L.; Delp, S.; Schwartz, M. Automatic real-time gait event detection in children using deep neural networks. PLoS ONE 2019, 14, e0211466. [Google Scholar] [CrossRef] [PubMed]
  73. Michel, L.L.; Sommer, L.; Gonzalez Silos, R.; Lorenzo Bermejo, J.; von Au, A.; Seitz, J.; Hennigs, A.; Smetanay, K.; Golatta, M.; Heil, J.; et al. Prediction of local recurrence risk after neoadjuvant chemotherapy in patients with primary breast cancer: Clinical utility of the MD Anderson Prognostic Index. PLoS ONE 2019, 14, e0211337. [Google Scholar] [CrossRef] [PubMed]
  74. Pedersen, H.K.; Forslund, S.K.; Gudmundsdottir, V.; Petersen, A.O.; Hildebrand, F.; Hyotylainen, T.; Nielsen, T.; Hansen, T.; Bork, P.; Ehrlich, S.D.; et al. A computational framework to integrate high-throughput ’-omics’ datasets for the identification of potential mechanistic links. Nat. Protoc. 2018, 13, 2781–2800. [Google Scholar] [CrossRef] [PubMed]
  75. Ma, S.; Jiang, T.; Jiang, R. Constructing tissue-specific transcriptional regulatory networks via a Markov random field. BMC Genomics 2018, 19, 884. [Google Scholar] [CrossRef] [PubMed]
  76. Budu-Aggrey, A.; Brumpton, B.; Tyrrell, J.; Watkins, S.; Modalsli, E.H.; Celis-Morales, C.; Ferguson, L.D.; Vie, G.A.; Palmer, T.; Fritsche, L.G.; et al. Evidence of a causal relationship between body mass index and psoriasis: A mendelian randomization study. PLoS Med. 2019, 16, e1002739. [Google Scholar] [CrossRef] [PubMed]
  77. Nussinov, R.; Jang, H.; Tsai, C.J. The structural basis for cancer treatment decisions. Oncotarget 2014, 5, 7285–7302. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  78. Nussinov, R.; Tsai, C.J. Allostery in disease and in drug discovery. Cell 2013, 153, 293–305. [Google Scholar] [CrossRef] [PubMed]
  79. Nussinov, R.; Tsai, C.J.; Liu, J. Principles of allosteric interactions in cell signaling. J. Am. Chem. Soc. 2014, 136, 17692–17701. [Google Scholar] [CrossRef] [PubMed]
  80. Nussinov, R.; Muratcioglu, S.; Tsai, C.J.; Jang, H.; Gursoy, A.; Keskin, O. The Key Role of Calmodulin in KRAS-Driven Adenocarcinomas. Mol. Cancer Res. 2015, 13, 1265–1273. [Google Scholar] [CrossRef] [Green Version]
  81. Nussinov, R.; Muratcioglu, S.; Tsai, C.J.; Jang, H.; Gursoy, A.; Keskin, O. K-Ras4B/calmodulin/PI3Kalpha: A promising new adenocarcinoma-specific drug target? Expert Opin. Ther. Targets 2016, 20, 831–842. [Google Scholar] [CrossRef] [PubMed]
  82. Nussinov, R.; Wang, G.; Tsai, C.J.; Jang, H.; Lu, S.; Banerjee, A.; Zhang, J.; Gaponenko, V. Calmodulin and PI3K Signaling in KRAS Cancers. Trends Cancer 2017, 3, 214–224. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  83. Jang, H.; Muratcioglu, S.; Gursoy, A.; Keskin, O.; Nussinov, R. Membrane-associated Ras dimers are isoform-specific: K-Ras dimers differ from H-Ras dimers. Biochem. J. 2016, 473, 1719–1732. [Google Scholar] [CrossRef] [PubMed]
  84. Guven-Maiorov, E.; Tsai, C.J.; Ma, B.; Nussinov, R. Interface-Based Structural Prediction of Novel Host-Pathogen Interactions. Methods Mol. Biol. 2019, 1851, 317–335. [Google Scholar] [PubMed]
  85. Rangarajan, S.; He, Y.; Chen, Y.; Kerzic, M.C.; Ma, B.; Gowthaman, R.; Pierce, B.G.; Nussinov, R.; Mariuzza, R.A.; Orban, J. Peptide-MHC (pMHC) binding to a human antiviral T cell receptor induces long-range allosteric communication between pMHC- and CD3-binding sites. J. Biol. Chem. 2018, 293, 15991–16005. [Google Scholar] [CrossRef] [PubMed]
  86. Weismiller, H.A.; Murphy, R.; Wei, G.; Ma, B.; Nussinov, R.; Margittai, M. Structural disorder in four-repeat Tau fibrils reveals a new mechanism for barriers to cross-seeding of Tau isoforms. J. Biol. Chem. 2018, 293, 17336–17348. [Google Scholar] [CrossRef] [PubMed]
  87. Zhao, J.; Nussinov, R.; Ma, B. Mechanisms of recognition of amyloid-beta (Aβ) monomer, oligomer, and fibril by homologous antibodies. J. Biol. Chem. 2017, 292, 18325–18343. [Google Scholar] [CrossRef] [PubMed]
  88. Yang, M.; Livnat Levanon, N.; Acar, B.; Aykac Fas, B.; Masrati, G.; Rose, J.; Ben-Tal, N.; Haliloglu, T.; Zhao, Y.; Lewinson, O. Single-molecule probing of the conformational homogeneity of the ABC transporter BtuCD. Nat. Chem. Biol. 2018, 14, 715–722. [Google Scholar] [CrossRef]
  89. Chen, K.E.; Tillu, V.A.; Chandra, M.; Collins, B.M. Molecular Basis for Membrane Recruitment by the PX and C2 Domains of Class II Phosphoinositide 3-Kinase-C2α. Structure 2018, 26, 1612–1625. [Google Scholar] [CrossRef]
  90. Riccio, G.; Bottone, S.; La Regina, G.; Badolati, N.; Passacantilli, S.; Rossi, G.B.; Accardo, A.; Dentice, M.; Silvestri, R.; Novellino, E.; et al. A Negative Allosteric Modulator of WNT Receptor Frizzled 4 Switches into an Allosteric Agonist. Biochemistry 2018, 57, 839–851. [Google Scholar] [CrossRef]
  91. Gentile, D.R.; Rathinaswamy, M.K.; Jenkins, M.L.; Moss, S.M.; Siempelkamp, B.D.; Renslo, A.R.; Burke, J.E.; Shokat, K.M. Ras Binder Induces a Modified Switch-II Pocket in GTP and GDP States. Cell Chem. Biol. 2017, 24, 1455–1466. [Google Scholar] [CrossRef]
  92. Parker, J.A.; Volmar, A.Y.; Pavlopoulos, S.; Mattos, C. K-Ras Populates Conformational States Differently from Its Isoform H-Ras and Oncogenic Mutant K-RasG12D. Structure 2018, 26, 810–820. [Google Scholar] [CrossRef] [PubMed]
  93. Nakhaeizadeh, H.; Amin, E.; Nakhaei-Rad, S.; Dvorsky, R.; Ahmadian, M.R. The RAS-Effector Interface: Isoform-Specific Differences in the Effector Binding Regions. PLoS ONE 2016, 11, e0167145. [Google Scholar] [CrossRef] [PubMed]
  94. Ung, P.M.; Rahman, R.; Schlessinger, A. Redefining the Protein Kinase Conformational Space with Machine Learning. Cell Chem. Biol. 2018, 25, 916–924. [Google Scholar] [CrossRef] [PubMed]
  95. Ward, R.A.; Anderton, M.J.; Ashton, S.; Bethel, P.A.; Box, M.; Butterworth, S.; Colclough, N.; Chorley, C.G.; Chuaqui, C.; Cross, D.A.; et al. Structure- and reactivity-based development of covalent inhibitors of the activating and gatekeeper mutant forms of the epidermal growth factor receptor (EGFR). J. Med. Chem. 2013, 56, 7025–7048. [Google Scholar] [CrossRef] [PubMed]
  96. Yarza, R.; Vela, S.; Solas, M.; Ramirez, M.J. c-Jun N-terminal Kinase (JNK) Signaling as a Therapeutic Target for Alzheimer′s Disease. Front. Pharmacol. 2015, 6, 321. [Google Scholar] [PubMed]
  97. Zeke, A.; Misheva, M.; Remenyi, A.; Bogoyevitch, M.A. JNK Signaling: Regulation and Functions Based on Complex Protein-Protein Partnerships. Microbiol. Mol. Biol. Rev. 2016, 80, 793–835. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  98. Biancucci, M.; Minasov, G.; Banerjee, A.; Herrera, A.; Woida, P.J.; Kieffer, M.B.; Bindu, L.; Abreu-Blanco, M.; Anderson, W.F.; Gaponenko, V.; et al. The bacterial Ras/Rap1 site-specific endopeptidase RRSP cleaves Ras through an atypical mechanism to disrupt Ras-ERK signaling. Sci. Signal. 2018, 11, eaat8335. [Google Scholar] [CrossRef]
  99. Hitchinson, B.; Eby, J.M.; Gao, X.; Guite-Vinet, F.; Ziarek, J.J.; Abdelkarim, H.; Lee, Y.; Okamoto, Y.; Shikano, S.; Majetschak, M.; et al. Biased antagonism of CXCR4 avoids antagonist tolerance. Sci. Signal. 2018, 11, eaat2214. [Google Scholar] [CrossRef]
  100. Liu, Y.; Ebalunode, J.O.; Briggs, J.M. Insights into the substrate binding specificity of quorum-quenching acylase PvdQ. J. Mol. Graph. Model. 2019, 88, 104–120. [Google Scholar] [CrossRef]
  101. Mitra, M.; Asad, M.; Kumar, S.; Yadav, K.; Chaudhary, S.; Bhavesh, N.S.; Khalid, S.; Thukral, L.; Bajaj, A. Distinct Intramolecular Hydrogen Bonding Dictates Antimicrobial Action of Membrane-Targeting Amphiphiles. J. Phys. Chem. Lett. 2019. [Google Scholar] [CrossRef] [PubMed]
  102. Bonhenry, D.; Schober, R.; Schmidt, T.; Waldherr, L.; Ettrich, R.H.; Schindl, R. Mechanistic insights into the Orai channel by molecular dynamics simulations. Semin. Cell Dev. Biol. 2019. [Google Scholar] [CrossRef] [PubMed]
  103. Oshima, H.; Re, S.; Sakakura, M.; Takahashi, H.; Sugita, Y. Population Shift Mechanism for Partial Agonism of AMPA Receptor. Biophys. J. 2019, 116, 57–68. [Google Scholar] [CrossRef] [PubMed]
  104. Lu, C.; Liu, X.; Zhang, C.S.; Gong, H.; Wu, J.W.; Wang, Z.X. Structural and Dynamic Insights into the Mechanism of Allosteric Signal Transmission in ERK2-Mediated MKP3 Activation. Biochemistry 2017, 56, 6165–6175. [Google Scholar] [CrossRef]
  105. Jambrina, P.G.; Rauch, N.; Pilkington, R.; Rybakova, K.; Nguyen, L.K.; Kholodenko, B.N.; Buchete, N.V.; Kolch, W.; Rosta, E. Phosphorylation of RAF Kinase Dimers Drives Conformational Changes that Facilitate Transactivation. Angew. Chem. Int. Ed. Engl. 2016, 55, 983–986. [Google Scholar] [CrossRef] [PubMed]
  106. Barr, D.; Oashi, T.; Burkhard, K.; Lucius, S.; Samadani, R.; Zhang, J.; Shapiro, P.; MacKerell, A.D.; van der Vaart, A. Importance of domain closure for the autoactivation of ERK2. Biochemistry 2011, 50, 8038–8048. [Google Scholar] [CrossRef] [PubMed]
  107. Ozdemir, E.S.; Jang, H.; Gursoy, A.; Keskin, O.; Li, Z.; Sacks, D.B.; Nussinov, R. Unraveling the molecular mechanism of interactions of the Rho GTPases Cdc42 and Rac1 with the scaffolding protein IQGAP2. J. Biol. Chem. 2018, 293, 3685–3699. [Google Scholar] [CrossRef] [Green Version]
  108. Echeverria, I.; Liu, Y.; Gabelli, S.B.; Amzel, L.M. Oncogenic mutations weaken the interactions that stabilize the p110α-p85α heterodimer in phosphatidylinositol 3-kinase α. FEBS J. 2015, 282, 3528–3542. [Google Scholar] [CrossRef] [PubMed]
  109. Fetics, S.K.; Guterres, H.; Kearney, B.M.; Buhrman, G.; Ma, B.; Nussinov, R.; Mattos, C. Allosteric effects of the oncogenic RasQ61L mutant on Raf-RBD. Structure 2015, 23, 505–516. [Google Scholar] [CrossRef]
  110. Li, Z.L.; Prakash, P.; Buck, M. A “Tug of War” Maintains a Dynamic Protein-Membrane Complex: Molecular Dynamics Simulations of C-Raf RBD-CRD Bound to K-Ras4B at an Anionic Membrane. ACS Cent. Sci. 2018, 4, 298–305. [Google Scholar] [CrossRef]
  111. Skinner, J.J.; Wang, S.; Lee, J.; Ong, C.; Sommese, R.; Sivaramakrishnan, S.; Koelmel, W.; Hirschbeck, M.; Schindelin, H.; Kisker, C.; et al. Conserved salt-bridge competition triggered by phosphorylation regulates the protein interactome. Proc. Natl. Acad. Sci. USA 2017, 114, 13453–13458. [Google Scholar] [CrossRef] [PubMed]
  112. Lee, J.; Wu, S.; Zhang, Y. Ab Initio Protein Structure Prediction. In From Protein Structure to Function with Bioinformatics; Rigden, D.J., Ed.; Springer: Dordrecht, The Netherlands, 2009; pp. 3–35. [Google Scholar]
  113. Lensink, M.F.; Velankar, S.; Baek, M.; Heo, L.; Seok, C.; Wodak, S.J. The challenge of modeling protein assemblies: The CASP12-CAPRI experiment. Proteins 2018, 86, 257–273. [Google Scholar] [PubMed]
  114. Shehu, A.; Nussinov, R. Computational Methods for Exploration and Analysis of Macromolecular Structure and Dynamics. PLoS Comput. Biol. 2015, 11, e1004585. [Google Scholar] [CrossRef] [PubMed]
  115. Maximova, T.; Moffatt, R.; Ma, B.; Nussinov, R.; Shehu, A. Principles and Overview of Sampling Methods for Modeling Macromolecular Structure and Dynamics. PLoS Comput. Biol. 2016, 12, e1004619. [Google Scholar] [CrossRef] [PubMed]
  116. Tan, Z.W.; Guarnera, E.; Berezovsky, I.N. Exploring chromatin hierarchical organization via Markov State Modelling. PLoS Comput. Biol. 2018, 14, e1006686. [Google Scholar] [CrossRef] [PubMed]
  117. Service, R.F. Google’s DeepMind aces protein folding. Available online: http://www.sciencemag.org/news/2018/12/google-s-deepmind-aces-protein-folding (accessed on 6 December 2018).
  118. Qiao, W.; Akhter, N.; Fang, X.; Maximova, T.; Plaku, E.; Shehu, A. From mutations to mechanisms and dysfunction via computation and mining of protein energy landscapes. BMC Genomics 2018, 19, 671. [Google Scholar] [CrossRef] [PubMed]
  119. Akhter, N.; Shehu, A. From Extraction of Local Structures of Protein Energy Landscapes to Improved Decoy Selection in Template-Free Protein Structure Prediction. Molecules 2018, 23, 216. [Google Scholar] [CrossRef] [PubMed]
  120. Sapin, E.; Carr, D.B.; De Jong, K.A.; Shehu, A. Comput. ing energy landscape maps and structural excursions of proteins. BMC Genomics 2016, 17, 546. [Google Scholar] [CrossRef]
  121. Gardino, A.K.; Villali, J.; Kivenson, A.; Lei, M.; Liu, C.F.; Steindel, P.; Eisenmesser, E.Z.; Labeikovsky, W.; Wolf-Watz, M.; Clarkson, M.W.; et al. Transient non-native hydrogen bonds promote activation of a signaling protein. Cell 2009, 139, 1109–1118. [Google Scholar] [CrossRef] [PubMed]
  122. Villali, J.; Kern, D. Choreographing an enzyme′s dance. Curr. Opin. Chem. Biol. 2010, 14, 636–643. [Google Scholar] [CrossRef]
  123. Curado-Carballada, C.; Feixas, F.; Iglesias-Fernandez, J.; Osuna, S. Hidden Conformations in Aspergillus niger Monoamine Oxidase are Key for Catalytic Efficiency. Angew. Chem. Int. Ed. Engl. 2019. [Google Scholar] [CrossRef]
  124. Zarrabi, N.; Schluesche, P.; Meisterernst, M.; Borsch, M.; Lamb, D.C. Analyzing the Dynamics of Single TBP-DNA-NC2 Complexes Using Hidden Markov Models. Biophys. J. 2018, 115, 2310–2326. [Google Scholar] [CrossRef] [PubMed]
  125. Crooks, J.E.; Boughter, C.T.; Scott, L.R.; Adams, E.J. The Hypervariable Loops of Free TCRs Sample Multiple Distinct Metastable Conformations in Solution. Front. Mol. Biosci. 2018, 5, 95. [Google Scholar] [CrossRef] [PubMed]
  126. Narayan, B.; Herbert, C.; Yuan, Y.; Rodriguez, B.J.; Brooks, B.R.; Buchete, N.V. Conformational analysis of replica exchange MD: Temperature-dependent Markov networks for FF amyloid peptides. J. Chem. Phys. 2018, 149, 072323. [Google Scholar] [CrossRef] [PubMed]
  127. Biswas, M.; Lickert, B.; Stock, G. Metadynamics Enhanced Markov Modeling of Protein Dynamics. J. Phys. Chem. B 2018, 122, 5508–5514. [Google Scholar] [CrossRef] [PubMed]
  128. Zimmerman, M.I.; Hart, K.M.; Sibbald, C.A.; Frederick, T.E.; Jimah, J.R.; Knoverek, C.R.; Tolia, N.H.; Bowman, G.R. Prediction of New Stabilizing Mutations Based on Mechanistic Insights from Markov State Models. ACS Cent. Sci. 2017, 3, 1311–1321. [Google Scholar] [CrossRef]
  129. Olsson, S.; Wu, H.; Paul, F.; Clementi, C.; Noe, F. Combining experimental and simulation data of molecular processes via augmented Markov models. Proc. Natl. Acad. Sci. USA 2017, 114, 8265–8270. [Google Scholar] [CrossRef] [Green Version]
  130. Khrenova, M.G.; Kots, E.D.; Varfolomeev, S.D.; Lushchekina, S.V.; Nemukhin, A.V. Three Faces of N-Acetylaspartate: Activator, Substrate, and Inhibitor of Human Aspartoacylase. J. Phys. Chem. B 2017, 121, 9389–9397. [Google Scholar] [CrossRef]
  131. Ho, K.C.; Hamelberg, D. Combinatorial Coarse-Graining of Molecular Dynamics Simulations for Detecting Relationships between Local Configurations and Overall Conformations. J. Chem. Theory Comput. 2018, 14, 6026–6034. [Google Scholar] [CrossRef]
  132. Katkar, H.H.; Davtyan, A.; Durumeric, A.E.P.; Hocky, G.M.; Schramm, A.C.; De La Cruz, E.M.; Voth, G.A. Insights into the Cooperative Nature of ATP Hydrolysis in Actin Filaments. Biophys. J. 2018, 115, 1589–1602. [Google Scholar] [CrossRef]
  133. Bian, Y.; Ren, W.; Song, F.; Yu, J.; Wang, J. Exploration of the folding dynamics of human telomeric G-quadruplex with a hybrid atomistic structure-based model. J. Chem. Phys. 2018, 148, 204107. [Google Scholar] [CrossRef] [PubMed]
  134. Lerner, E.; Ingargiola, A.; Weiss, S. Characterizing highly dynamic conformational states: The transcription bubble in RNAP-promoter open complex as an example. J. Chem. Phys. 2018, 148, 123315. [Google Scholar] [CrossRef] [PubMed]
  135. Wang, A.; Chan Miller, C.; Szostak, J.W. Core-Shell Modeling of Light Scattering by Vesicles: Effect of Size, Contents, and Lamellarity. Biophys. J. 2019. [Google Scholar] [CrossRef] [PubMed]
  136. Liu, W.; Wang, X. Prediction of functional microRNA targets by integrative modeling of microRNA binding and target expression data. Genome Biol. 2019, 20, 18. [Google Scholar] [CrossRef] [PubMed]
  137. Berman, H.M.; Trewhella, J.; Vallat, B.; Westbrook, J.D. Archiving of Integrative Structural Models. Adv. Exp. Med. Biol. 2018, 1105, 261–272. [Google Scholar] [PubMed]
  138. Nussinov, R.; Jang, H.; Tsai, C.J.; Cheng, F. Precision medicine review: Rare driver mutations and their biophysical classification. Biophys. Rev. 2019. [Google Scholar] [CrossRef] [PubMed]
  139. Cheng, F.; Liang, H.; Butte, A.J.; Eng, C.; Nussinov, R. Personal Mutanomes Meet Modern Oncology Drug Discovery and Precision Health. Pharmacol. Rev. 2019, 71, 1–19. [Google Scholar] [CrossRef] [PubMed]
  140. Huang, H.; Simmerling, C. Fast Pairwise Approximation of Solvent Accessible Surface Area for Implicit Solvent Simulations of Proteins on CPUs and GPUs. J. Chem. Theory Comput. 2018, 14, 5797–5814. [Google Scholar] [CrossRef] [PubMed]
  141. Nguyen, H.; Perez, A.; Bermeo, S.; Simmerling, C. Refinement of Generalized Born Implicit Solvation Parameters for Nucleic Acids and Their Complexes with Proteins. J. Chem. Theory Comput. 2015, 11, 3714–3728. [Google Scholar] [CrossRef] [Green Version]
  142. Behler, J. Perspective: Machine learning potentials for atomistic simulations. J. Chem. Phys. 2016, 145, 170901. [Google Scholar] [CrossRef] [Green Version]
  143. Veltri, D.; Kamath, U.; Shehu, A. Deep learning improves antimicrobial peptide recognition. Bioinformatics 2018, 34, 2740–2747. [Google Scholar] [CrossRef] [PubMed]

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Nussinov, R.; Tsai, C.-J.; Shehu, A.; Jang, H. Computational Structural Biology: Successes, Future Directions, and Challenges. Molecules 2019, 24, 637. https://doi.org/10.3390/molecules24030637

AMA Style

Nussinov R, Tsai C-J, Shehu A, Jang H. Computational Structural Biology: Successes, Future Directions, and Challenges. Molecules. 2019; 24(3):637. https://doi.org/10.3390/molecules24030637

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Nussinov, Ruth, Chung-Jung Tsai, Amarda Shehu, and Hyunbum Jang. 2019. "Computational Structural Biology: Successes, Future Directions, and Challenges" Molecules 24, no. 3: 637. https://doi.org/10.3390/molecules24030637

APA Style

Nussinov, R., Tsai, C. -J., Shehu, A., & Jang, H. (2019). Computational Structural Biology: Successes, Future Directions, and Challenges. Molecules, 24(3), 637. https://doi.org/10.3390/molecules24030637

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