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Marine Drugs
Special Issues
Enzyme Inhibitors of Marine Origin
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Enzyme Inhibitors of Marine Origin

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

Deadline for manuscript submissions: closed (28 February 2017) | Viewed by 33930

Special Issue Editor

Prof. Dr. Sadanandan E. E. Velu

E-Mail Website
Guest Editor
Department of Chemistry, University of Alabama at Birmingham, Birmingham, AL, USA
Interests: organic/medicinal chemistry; drug discovery and development; anti-cancer and anti-infective agents; synthesis of marine natural products and their analogs; structure based drug design; SAR studies and lead optimization
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Marine natural products have recently received increased attention as a source of lead compounds for drug discovery. These compounds are initially identified based on bioactivity screens and their mode of action is largely unknown. Discerning their mode of action is a critical step in their further development as potential drugs. Many of such lead compounds are enzyme inhibitors. This Special Issue focuses on such marine-derived natural products or their analogs that are enzyme inhibitors. The coverage includes the biological activities of the lead compounds, identification of the target enzyme, location of the enzyme binding site and the mechanistic details of the enzyme inhibition. We aim to publish both original research articles and review articles in this Special Issue.

Prof. Dr. Sadanandan E. Velu
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Marine Drugs is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2900 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • marine alkaloid
  • analog
  • synthesis
  • cytotoxic
  • anticancer
  • anti-inflammatory
  • antibacterial
  • antimalarial
  • antiviral
  • enzyme inhibitor
  • non-specific
  • specific
  • irreversible
  • reversible
  • competitive
  • non-competitive
  • allosteric

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Published Papers (5 papers)

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Research

5474 KiB  
Article
Identification of Tight-Binding Plasmepsin II and Falcipain 2 Inhibitors in Aqueous Extracts of Marine Invertebrates by the Combination of Enzymatic and Interaction-Based Assays
by Emir Salas-Sarduy, Yasel Guerra, Giovanni Covaleda Cortés, Francesc Xavier Avilés and María A. Chávez Planes
Mar. Drugs 2017, 15(4), 123; https://doi.org/10.3390/md15040123 - 21 Apr 2017
Cited by 7 | Viewed by 4937
Abstract
Natural products from marine origin constitute a very promising and underexplored source of interesting compounds for modern biotechnological and pharmaceutical industries. However, their evaluation is quite challenging and requires specifically designed assays to reliably identify the compounds of interest in a highly heterogeneous [...] Read more.
Natural products from marine origin constitute a very promising and underexplored source of interesting compounds for modern biotechnological and pharmaceutical industries. However, their evaluation is quite challenging and requires specifically designed assays to reliably identify the compounds of interest in a highly heterogeneous and interfering context. In the present study, we describe a general strategy for the confident identification of tight-binding protease inhibitors in the aqueous extracts of 62 Cuban marine invertebrates, using Plasmodium falciparum hemoglobinases Plasmepsin II and Falcipain 2 as model enzymes. To this end, we first developed a screening strategy that combined enzymatic with interaction-based assays and then validated screening conditions using five reference extracts. Interferences were evaluated and minimized. The results from the massive screening of such extracts, the validation of several hits by a variety of interaction-based assays and the purification and functional characterization of PhPI, a multifunctional and reversible tight-binding inhibitor for Plasmepsin II and Falcipain 2 from the gorgonian Plexaura homomalla, are presented. Full article
(This article belongs to the Special Issue Enzyme Inhibitors of Marine Origin)
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1840 KiB  
Article
Optimization of Bromelain-Aided Production of Angiotensin I-Converting Enzyme Inhibitory Hydrolysates from Stone Fish Using Response Surface Methodology
by Shehu Muhammad Auwal, Mohammad Zarei, Azizah Abdul-Hamid and Nazamid Saari
Mar. Drugs 2017, 15(4), 104; https://doi.org/10.3390/md15040104 - 31 Mar 2017
Cited by 41 | Viewed by 6306
Abstract
The stone fish is an under-utilized sea cucumber with many nutritional and ethno-medicinal values. This study aimed to establish the conditions for its optimum hydrolysis with bromelain to generate angiotensin I-converting enzyme (ACE)-inhibitory hydrolysates. Response surface methodology (RSM) based on a central composite [...] Read more.
The stone fish is an under-utilized sea cucumber with many nutritional and ethno-medicinal values. This study aimed to establish the conditions for its optimum hydrolysis with bromelain to generate angiotensin I-converting enzyme (ACE)-inhibitory hydrolysates. Response surface methodology (RSM) based on a central composite design was used to model and optimize the degree of hydrolysis (DH) and ACE-inhibitory activity. Process conditions including pH (4–7), temperature (40–70 °C), enzyme/substrate (E/S) ratio (0.5%–2%) and time (30–360 min) were used. A pH of 7.0, temperature of 40 °C, E/S ratio of 2% and time of 240 min were determined using a response surface model as the optimum levels to obtain the maximum ACE-inhibitory activity of 84.26% at 44.59% degree of hydrolysis. Hence, RSM can serve as an effective approach in the design of experiments to improve the antihypertensive effect of stone fish hydrolysates, which can thus be used as a value-added ingredient for various applications in the functional foods industries. Full article
(This article belongs to the Special Issue Enzyme Inhibitors of Marine Origin)
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1077 KiB  
Article
New Enzyme-Inhibitory Triterpenoid from Marine Macro Brown Alga Padina boergesenii Allender & Kraft
by Liaqat Ali, Abdul Latif Khan, Muhammad Al-Broumi, Rashid Al-Harrasi, Lubna Al-Kharusi, Javid Hussain and Ahmed Al-Harrasi
Mar. Drugs 2017, 15(1), 19; https://doi.org/10.3390/md15010019 - 18 Jan 2017
Cited by 13 | Viewed by 5920
Abstract
In continuation to our study of the chemical and biological potential of the secondary metabolites isolated from Omani seaweeds, we investigated a marine brown alga, Padina boergesenii. The phytochemical investigation resulted in the isolation of a new secondary metabolite, padinolic acid ( [...] Read more.
In continuation to our study of the chemical and biological potential of the secondary metabolites isolated from Omani seaweeds, we investigated a marine brown alga, Padina boergesenii. The phytochemical investigation resulted in the isolation of a new secondary metabolite, padinolic acid (1), along with some other semi-pure fractions and sub-fractions. The planar structure was confirmed through MS and NMR (1D and 2D) spectral data. The NOESY experiments coupled with the biogenetic consideration were helpful in assigning the stereochemistry in the molecule. Compound 1 was subjected to enzyme inhibition studies using urease, lipid peroxidase, and alpha-glucosidase enzymes. Compound 1 showed low to moderate α-glucosidase and urease enzyme inhibition, respectively, and moderate anti-lipid peroxidation activities. The current study indicates the potential of this seaweed and provides the basis for further investigation. Full article
(This article belongs to the Special Issue Enzyme Inhibitors of Marine Origin)
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1067 KiB  
Article
Natural Products from Microalgae with Potential against Alzheimer’s Disease: Sulfolipids Are Potent Glutaminyl Cyclase Inhibitors
by Stephanie Hielscher-Michael, Carola Griehl, Mirko Buchholz, Hans-Ulrich Demuth, Norbert Arnold and Ludger A. Wessjohann
Mar. Drugs 2016, 14(11), 203; https://doi.org/10.3390/md14110203 - 2 Nov 2016
Cited by 53 | Viewed by 10020
Abstract
In recent years, many new enzymes, like glutaminyl cyclase (QC), could be associated with pathophysiological processes and represent targets for many diseases, so that enzyme-inhibiting properties of natural substances are becoming increasingly important. In different studies, the pathophysiology connection of QC to various [...] Read more.
In recent years, many new enzymes, like glutaminyl cyclase (QC), could be associated with pathophysiological processes and represent targets for many diseases, so that enzyme-inhibiting properties of natural substances are becoming increasingly important. In different studies, the pathophysiology connection of QC to various diseases including Alzheimer’s disease (AD) was described. Algae are known for the ability to synthesize complex and highly-diverse compounds with specific enzyme inhibition properties. Therefore, we screened different algae species for the presence of QC inhibiting metabolites using a new “Reverse Metabolomics” technique including an Activity-correlation Analysis (AcorA), which is based on the correlation of bioactivities to mass spectral data with the aid of mathematic informatics deconvolution. Thus, three QC inhibiting compounds from microalgae belonging to the family of sulfolipids were identified. The compounds showed a QC inhibition of 81% and 76% at concentrations of 0.25 mg/mL and 0.025 mg/mL, respectively. Thus, for the first time, sulfolipids are identified as QC inhibiting compounds and possess substructures with the required pharmacophore qualities. They represent a new lead structure for QC inhibitors. Full article
(This article belongs to the Special Issue Enzyme Inhibitors of Marine Origin)
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1034 KiB  
Article
Different Culture Metabolites of the Red Sea Fungus Fusarium equiseti Optimize the Inhibition of Hepatitis C Virus NS3/4A Protease (HCV PR)
by Usama W. Hawas, Radwan Al-Farawati, Lamia T. Abou El-Kassem and Adnan J. Turki
Mar. Drugs 2016, 14(10), 190; https://doi.org/10.3390/md14100190 - 20 Oct 2016
Cited by 26 | Viewed by 5995
Abstract
The endophytic fungus Fusarium equiseti was isolated from the brown alga Padina pavonica, collected from the Red Sea. The fungus was identified by its morphology and 18S rDNA. Cultivation of this fungal strain in biomalt-peptone medium led to isolation of 12 known [...] Read more.
The endophytic fungus Fusarium equiseti was isolated from the brown alga Padina pavonica, collected from the Red Sea. The fungus was identified by its morphology and 18S rDNA. Cultivation of this fungal strain in biomalt-peptone medium led to isolation of 12 known metabolites of diketopeprazines and anthraquinones. The organic extract and isolated compounds were screened for their inhibition of hepatitis C virus NS3/4A protease (HCV PR). As a result, the fungal metabolites showed inhibition of HCV protease (IC50 from 19 to 77 μM), and the fungus was subjected to culture on Czapek’s (Cz) media, with a yield of nine metabolites with potent HCV protease inhibition ranging from IC50 10 to 37 μM. The Cz culture extract exhibited high-level inhibition of HCV protease (IC50 27.6 μg/mL) compared to the biomalt culture extract (IC50 56 μg/mL), and the most potent HCV PR isolated compound (Griseoxanthone C, IC50 19.8 μM) from the bio-malt culture extract showed less of an inhibitory effect compared to isolated ω-hydroxyemodin (IC50 10.7 μM) from the optimized Cz culture extract. Both HCV PR active inhibitors ω-hydroxyemodin and griseoxanthone C were considered as the lowest selective safe constituents against Trypsin inhibitory effect with IC50 48.5 and 51.3 μM, respectively. Full article
(This article belongs to the Special Issue Enzyme Inhibitors of Marine Origin)
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