Application of Circular Dichroism to Define Stereostructures of Marine Bioactives

A special issue of Marine Drugs (ISSN 1660-3397).

Deadline for manuscript submissions: closed (15 November 2020) | Viewed by 4389

Special Issue Editor


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Guest Editor
Instituto de Ciências Biomédicas de Abel Salazar, Universidade do Porto, Porto, Portugal
Interests: application of experimental and simulated spectroscopic methods (ECD, NMR, UV, IR, etc.) to the structural elucidation of cellular metabolites

Special Issue Information

Dear Colleagues,

Oceans are a rich source of specialized carbon compounds, synthesised by marine life. This is apparent in the large and increasing number of papers dedicated to the isolation and structural elucidation of marine natural products. Almost all of these works also include bioactivity assays, mainly directed at pharmacological applications. As such, the elucidation of the stereochemical fine details of bio-tested marine natural products is of utmost importance, because bioactivity is a function not only of molecular structure but also of molecular stereoisomery.

In the field of natural products, stereochemistry-sensitive experimental data is predominantly obtained from spectroscopic techniques, such as polarimetry, nuclear magnetic resonance (NMR), and electronic circular dichroism (ECD). Although NMR data is analysed and interpreted by applying relatively straightforward empirical models, it cannot provide absolute configurations, except if the data can be referred to at least one chirality centre whose configuration is known in advance. ECD data, on the other hand, enables absolute configuration elucidation "from scratch", but its analysis poses a quite different challenge than NMR data, because it requires sophisticated theoretical models. Computational molecular modelling, conformational search, and spectral simulation are all essential parts of ECD spectral analysis, based on quantum chemistry for more exact predictions.

In this context, and for this Special Issue, we invite manuscript submissions that highlight the detailed application of circular dichroism methods to the stereochemical elucidation of marine bioactive natural products.

Assist. Prof. José Augusto Pereira
Guest Editor

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Keywords

  • marine bioactives
  • molecular modelling
  • electronic circular dichroism
  • nuclear magnetic resonance
  • structure elucidation
  • stereochemical elucidation
  • polarimetry
  • conformational search

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Published Papers (1 paper)

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Research

13 pages, 1507 KiB  
Article
Donghaecyclinones A–C: New Cytotoxic Rearranged Angucyclinones from a Volcanic Island-Derived Marine Streptomyces sp.
by Munhyung Bae, Joon Soo An, Seong-Heon Hong, Eun Seo Bae, Beomkoo Chung, Yun Kwon, Suckchang Hong, Ki-Bong Oh, Jongheon Shin, Sang Kook Lee and Dong-Chan Oh
Mar. Drugs 2020, 18(2), 121; https://doi.org/10.3390/md18020121 - 18 Feb 2020
Cited by 17 | Viewed by 3906
Abstract
Chemical profiling of the Streptomyces sp. strain SUD119, which was isolated from a marine sediment sample collected from a volcanic island in Korea, led to the discovery of three new metabolites: donghaecyclinones A–C (13). The structures of 1 [...] Read more.
Chemical profiling of the Streptomyces sp. strain SUD119, which was isolated from a marine sediment sample collected from a volcanic island in Korea, led to the discovery of three new metabolites: donghaecyclinones A–C (13). The structures of 13 were found to be rearranged, multicyclic, angucyclinone-class compounds according to nuclear magnetic resonance (NMR) and mass spectrometry (MS) analyses. The configurations of their stereogenic centers were successfully assigned using a combination of quantum mechanics–based computational methods for calculating the NMR shielding tensor (DP4 and CP3) as well as electronic circular dichroism (ECD) along with a modified version of Mosher’s method. Donghaecyclinones A–C (13) displayed cytotoxicity against diverse human cancer cell lines (IC50: 6.7–9.6 μM for 3). Full article
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