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Bishoyi AK, Mandhata CP, Sahoo CR, Paidesetty SK, Padhy RN. Nanosynthesis, phycochemical constituents, and pharmacological properties of cyanobacterium Oscillatoria sp. NAUNYN-SCHMIEDEBERG'S ARCHIVES OF PHARMACOLOGY 2024; 397:1347-1375. [PMID: 37712972 DOI: 10.1007/s00210-023-02719-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Accepted: 09/08/2023] [Indexed: 09/16/2023]
Abstract
The Oscillatoria sp., a blue-green alga or cyanobacterium, consists of about 305 species distributed globally. Cyanobacteria are prokaryotes possessing several secondary metabolites that have industrial and biomedical applications. Particularly, the published reviews on Oscillatoria sp. have not recorded any pharmacology, or possible details, while the detailed chemical structures of the alga are reported in the literature. Hence, this study considers pertinent pharmacological activities of the plethora of bioactive components of Oscillatoria sp. Furthermore, the metallic nanoparticles produced with Oscillatoria sp. were documented for plausible antibacterial, antifungal, antioxidant, anticancer, and cytotoxic effects against several cultured human cell lines. The antimicrobial activities of solvent extracts of Oscillatoria sp. and the biotic activities of its derivatives, pyridine, acridine, fatty acids, and triazine were structurally described in detail. To understand the connotations with research gaps and provide some pertinent prospective suggestions for further research on cyanobacteria as potent sources of pharmaceutical utilities, attempts were documented. The compounds of Oscillatoria sp. are a potent source of secondary metabolites that inhibit the cancer cell lines, in vitro. It could be expected that by holistic exploitation, the natural Oscillatoria products, as the source of chemical varieties and comparatively more potent inhibitors, would be explored against pharmacological activities with the integument of SARs.
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Affiliation(s)
- Ajit Kumar Bishoyi
- Central Research Laboratory, Institute of Medical Sciences and SUM Hospital, Siksha 'O' Anusandhan Deemed to Be University, Bhubaneswar, 751003, Odisha, India
- Department of Medicinal Chemistry, School of Pharmaceutical Sciences, Siksha 'O' Anusandhan Deemed to Be University, Bhubaneswar, 751003, Odisha, India
| | - Chinmayee Priyadarsani Mandhata
- Central Research Laboratory, Institute of Medical Sciences and SUM Hospital, Siksha 'O' Anusandhan Deemed to Be University, Bhubaneswar, 751003, Odisha, India
| | - Chita Ranjan Sahoo
- Central Research Laboratory, Institute of Medical Sciences and SUM Hospital, Siksha 'O' Anusandhan Deemed to Be University, Bhubaneswar, 751003, Odisha, India
- Department of Medicinal Chemistry, School of Pharmaceutical Sciences, Siksha 'O' Anusandhan Deemed to Be University, Bhubaneswar, 751003, Odisha, India
| | - Sudhir Kumar Paidesetty
- Department of Medicinal Chemistry, School of Pharmaceutical Sciences, Siksha 'O' Anusandhan Deemed to Be University, Bhubaneswar, 751003, Odisha, India
| | - Rabindra Nath Padhy
- Central Research Laboratory, Institute of Medical Sciences and SUM Hospital, Siksha 'O' Anusandhan Deemed to Be University, Bhubaneswar, 751003, Odisha, India.
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2
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Saide A, Damiano S, Ciarcia R, Lauritano C. Promising Activities of Marine Natural Products against Hematopoietic Malignancies. Biomedicines 2021; 9:645. [PMID: 34198841 PMCID: PMC8228764 DOI: 10.3390/biomedicines9060645] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Revised: 05/31/2021] [Accepted: 06/01/2021] [Indexed: 02/06/2023] Open
Abstract
According to the WHO classification of tumors, more than 150 typologies of hematopoietic and lymphoid tumors exist, and most of them remain incurable diseases that require innovative approaches to improve therapeutic outcome and avoid side effects. Marine organisms represent a reservoir of novel bioactive metabolites, but they are still less studied compared to their terrestrial counterparts. This review is focused on marine natural products with anticancer activity against hematological tumors, highlighting recent advances and possible perspectives. Until now, there are five commercially available marine-derived compounds for the treatment of various hematopoietic cancers (e.g., leukemia and lymphoma), two molecules in clinical trials, and series of compounds and/or extracts from marine micro- and macroorganisms which have shown promising properties. In addition, the mechanisms of action of several active compounds and extracts are still unknown and require further study. The continuous upgrading of omics technologies has also allowed identifying enzymes with possible bioactivity (e.g., l-asparaginase is currently used for the treatment of leukemia) or the enzymes involved in the synthesis of bioactive secondary metabolites which can be the target of heterologous expression and genetic engineering.
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Affiliation(s)
- Assunta Saide
- Marine Biotechnology Department, Stazione Zoologica Anton Dohrn, Villa Comunale, 80121 Napoli, Italy;
| | - Sara Damiano
- Department of Veterinary Medicine and Animal Productions, University of Naples “Federico II”, 80137 Naples, Italy;
| | - Roberto Ciarcia
- Department of Veterinary Medicine and Animal Productions, University of Naples “Federico II”, 80137 Naples, Italy;
| | - Chiara Lauritano
- Marine Biotechnology Department, Stazione Zoologica Anton Dohrn, Villa Comunale, 80121 Napoli, Italy;
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3
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In vitro screening of antimicrobial, antioxidant, cytotoxic activities, and characterization of bioactive substances from freshwater cyanobacteria Oscillatoria sp. SSCM01 and Phormidium sp. SSCM02. BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY 2020. [DOI: 10.1016/j.bcab.2020.101772] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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4
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Dahiya R, Dahiya S, Fuloria NK, Kumar S, Mourya R, Chennupati SV, Jankie S, Gautam H, Singh S, Karan SK, Maharaj S, Fuloria S, Shrivastava J, Agarwal A, Singh S, Kishor A, Jadon G, Sharma A. Natural Bioactive Thiazole-Based Peptides from Marine Resources: Structural and Pharmacological Aspects. Mar Drugs 2020; 18:md18060329. [PMID: 32599909 PMCID: PMC7345825 DOI: 10.3390/md18060329] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Revised: 06/18/2020] [Accepted: 06/19/2020] [Indexed: 12/11/2022] Open
Abstract
Peptides are distinctive biomacromolecules that demonstrate potential cytotoxicity and diversified bioactivities against a variety of microorganisms including bacteria, mycobacteria, and fungi via their unique mechanisms of action. Among broad-ranging pharmacologically active peptides, natural marine-originated thiazole-based oligopeptides possess peculiar structural features along with a wide spectrum of exceptional and potent bioproperties. Because of their complex nature and size divergence, thiazole-based peptides (TBPs) bestow a pivotal chemical platform in drug discovery processes to generate competent scaffolds for regulating allosteric binding sites and peptide–peptide interactions. The present study dissertates on the natural reservoirs and exclusive structural components of marine-originated TBPs, with a special focus on their most pertinent pharmacological profiles, which may impart vital resources for the development of novel peptide-based therapeutic agents.
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Affiliation(s)
- Rajiv Dahiya
- School of Pharmacy, Faculty of Medical Sciences, The University of the West Indies, St. Augustine, Trinidad & Tobago; (S.J.); (S.M.); (S.S.)
- Correspondence: (R.D.); (S.D.); Tel.: +1-868-493-5655 (R.D.); +1-787-758-2525 (ext. 5413) (S.D.)
| | - Sunita Dahiya
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Puerto Rico, Medical Sciences Campus, San Juan, PR 00936, USA
- Correspondence: (R.D.); (S.D.); Tel.: +1-868-493-5655 (R.D.); +1-787-758-2525 (ext. 5413) (S.D.)
| | - Neeraj Kumar Fuloria
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, AIMST University, Semeling, Bedong 08100, Kedah, Malaysia; (N.K.F.); (S.F.)
| | - Suresh Kumar
- Institute of Pharmaceutical Sciences, Kurukshetra University, Kurukshetra 136119, Haryana, India;
| | - Rita Mourya
- School of Pharmacy, College of Medicine and Health Sciences, University of Gondar, P.O. Box 196, Gondar 6200, Ethiopia;
| | - Suresh V. Chennupati
- Department of Pharmacy, College of Medical and Health Sciences, Wollega University, P.O. Box 395, Nekemte, Ethiopia;
| | - Satish Jankie
- School of Pharmacy, Faculty of Medical Sciences, The University of the West Indies, St. Augustine, Trinidad & Tobago; (S.J.); (S.M.); (S.S.)
| | - Hemendra Gautam
- Arya College of Pharmacy, Dr. A.P.J. Abdul Kalam Technical University, Nawabganj, Bareilly 243407, Uttar Pardesh, India;
| | - Sunil Singh
- Department of Pharmaceutical Chemistry, Ideal Institute of Pharmacy, Wada, Palghar 421303, Maharashtra, India;
| | - Sanjay Kumar Karan
- Department of Pharmaceutical Chemistry, Seemanta Institute of Pharmaceutical Sciences, Jharpokharia, Mayurbhanj 757086, Orissa, India;
| | - Sandeep Maharaj
- School of Pharmacy, Faculty of Medical Sciences, The University of the West Indies, St. Augustine, Trinidad & Tobago; (S.J.); (S.M.); (S.S.)
| | - Shivkanya Fuloria
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, AIMST University, Semeling, Bedong 08100, Kedah, Malaysia; (N.K.F.); (S.F.)
| | - Jyoti Shrivastava
- Department of Pharmaceutical Chemistry, The Oxford College of Pharmacy, Hongasandra, Bangalore 560068, Karnataka, India;
| | - Alka Agarwal
- Department of Pharmaceutical Chemistry, U.S. Ostwal Institute of Pharmacy, Mangalwad, Chittorgarh 313603, Rajasthan, India;
| | - Shamjeet Singh
- School of Pharmacy, Faculty of Medical Sciences, The University of the West Indies, St. Augustine, Trinidad & Tobago; (S.J.); (S.M.); (S.S.)
| | - Awadh Kishor
- Department of Pharmaceutical Biotechnology, Shrinathji Institute of Pharmacy, Nathdwara 313301, Rajsamand, Rajasthan, India;
| | - Gunjan Jadon
- Department of Pharmaceutical Chemistry, Shrinathji Institute of Pharmacy, Nathdwara 313301, Rajsamand, Rajasthan, India;
| | - Ajay Sharma
- Department of Pharmacognosy and Phytochemistry, School of Pharmaceutical Sciences, Delhi Pharmaceutical Sciences and Research University, New Delhi 110017, India;
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5
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Structure-Based Design, Synthesis and Bioactivity of a New Anti-TNFα Cyclopeptide. Molecules 2020; 25:molecules25040922. [PMID: 32093030 PMCID: PMC7071015 DOI: 10.3390/molecules25040922] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Revised: 02/09/2020] [Accepted: 02/14/2020] [Indexed: 02/07/2023] Open
Abstract
As opposed to small molecules, macrocyclic peptides possess a large surface area and are recognised as promising candidates to selectively treat diseases by disrupting specific protein–protein interactions (PPIs). Due to the difficulty in predicting cyclopeptide conformations in solution, the de novo design of bioactive cyclopeptides remains significantly challenging. In this study, we used the combination of conformational analyses and molecular docking studies to design a new cyclopeptide inhibitor of the interaction between the human tumour necrosis factor alpha (TNFα) and its receptor TNFR-1. This interaction is a key in mediating the inflammatory response to tissue injury and infection in humans, and it is also an important causative factor of rheumatoid arthritis, psoriasis and inflammatory bowel disease. The solution state NMR structure of the cyclopeptide was determined, which helped to deduce its mode of interaction with TNFα. TNFα sensor cells were used to evaluate the biological activity of the peptide.
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6
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Giordano D, Costantini M, Coppola D, Lauritano C, Núñez Pons L, Ruocco N, di Prisco G, Ianora A, Verde C. Biotechnological Applications of Bioactive Peptides From Marine Sources. Adv Microb Physiol 2018; 73:171-220. [PMID: 30262109 DOI: 10.1016/bs.ampbs.2018.05.002] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
This review is an overview on marine bioactive peptides with promising activities for the development of alternative drugs to fight human pathologies. In particular, we focus on potentially prolific producers of peptides in microorganisms, including sponge-associated bacteria and marine photoautotrophs such as microalgae and cyanobacteria. Microorganisms are still poorly explored for drug discovery, even if they are highly metabolically plastic and potentially amenable to culturing. This offers the possibility of obtaining a continuous source of bioactive compounds to satisfy the challenging demands of pharmaceutical industries. This review targets peptides because of the variety of potent biological activities demonstrated by these molecules, including antiviral, antimicrobial, antifungal, antioxidant, anticoagulant, antihypertensive, anticancer, antidiabetic, antiobesity, and calcium-binding bioactivities. Several of these peptides have already gained recognition as effective drug agents in recent years. We also focus on cutting-edge omic approaches for the discovery of novel compounds for pharmacological applications. With rapid depletion of natural resources, omic technologies may be the solution to efficiently produce a vast variety of novel peptides with unique pharmacological potential.
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Affiliation(s)
- Daniela Giordano
- Institute of Biosciences and BioResources (IBBR), CNR, Napoli, Italy; Department of Biology and Evolution of Marine Organisms, Stazione Zoologica Anton Dohrn, Napoli, Italy
| | - Maria Costantini
- Institute of Biosciences and BioResources (IBBR), CNR, Napoli, Italy; Department of Biology and Evolution of Marine Organisms, Stazione Zoologica Anton Dohrn, Napoli, Italy
| | - Daniela Coppola
- Institute of Biosciences and BioResources (IBBR), CNR, Napoli, Italy
| | - Chiara Lauritano
- Department of Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Napoli, Italy
| | - Laura Núñez Pons
- Department of Biology and Evolution of Marine Organisms, Stazione Zoologica Anton Dohrn, Napoli, Italy
| | - Nadia Ruocco
- Department of Biology and Evolution of Marine Organisms, Stazione Zoologica Anton Dohrn, Napoli, Italy; Department of Biology, University of Napoli Federico II, Complesso Universitario di Monte Sant'Angelo, Via Cinthia, Napoli, Italy; Bio-Organic Chemistry Unit, Institute of Biomolecular Chemistry-CNR, Napoli, Italy
| | - Guido di Prisco
- Institute of Biosciences and BioResources (IBBR), CNR, Napoli, Italy
| | - Adrianna Ianora
- Department of Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Napoli, Italy
| | - Cinzia Verde
- Institute of Biosciences and BioResources (IBBR), CNR, Napoli, Italy; Department of Biology and Evolution of Marine Organisms, Stazione Zoologica Anton Dohrn, Napoli, Italy; Dipartimento di Biologia, Università Roma 3, Roma, Italy.
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7
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Gogineni V, Hamann MT. Marine natural product peptides with therapeutic potential: Chemistry, biosynthesis, and pharmacology. Biochim Biophys Acta Gen Subj 2018; 1862:81-196. [PMID: 28844981 PMCID: PMC5918664 DOI: 10.1016/j.bbagen.2017.08.014] [Citation(s) in RCA: 72] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Revised: 08/07/2017] [Accepted: 08/09/2017] [Indexed: 12/21/2022]
Abstract
The oceans are a uniquely rich source of bioactive metabolites, of which sponges have been shown to be among the most prolific producers of diverse bioactive secondary metabolites with valuable therapeutic potential. Much attention has been focused on marine bioactive peptides due to their novel chemistry and diverse biological properties. As summarized in this review, marine peptides are known to exhibit various biological activities such as antiviral, anti-proliferative, antioxidant, anti-coagulant, anti-hypertensive, anti-cancer, antidiabetic, antiobesity, and calcium-binding activities. This review focuses on the chemistry and biology of peptides isolated from sponges, bacteria, cyanobacteria, fungi, ascidians, and other marine sources. The role of marine invertebrate microbiomes in natural products biosynthesis is discussed in this review along with the biosynthesis of modified peptides from different marine sources. The status of peptides in various phases of clinical trials is presented, as well as the development of modified peptides including optimization of PK and bioavailability.
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Affiliation(s)
- Vedanjali Gogineni
- Department of BioMolecular Sciences, Division of Medicinal Chemistry, School of Pharmacy, The University of Mississippi, University, MS, United States.
| | - Mark T Hamann
- Department of Drug Discovery and Biomedical Sciences, College of Pharmacy and Public Health Sciences, Medical University of South Carolina, Charleston, SC, United States.
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8
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Fatino A, Baca G, Weeramange C, Rafferty RJ. Total Synthesis of Reniochalistatin E. JOURNAL OF NATURAL PRODUCTS 2017; 80:3234-3240. [PMID: 29220182 DOI: 10.1021/acs.jnatprod.7b00656] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Reniochalistatin E (1) is one of the five related cyclic peptides isolated from the marine sponge Reniochalina stalagmitis. The discovery of these compounds resulted from a screening program directed toward the identification of proline-rich bioactive compounds. Reniochalistatin E is the only member of the family to possess a tryptophan amino acid residue. Given the cytotoxicity observed for 1, efforts were directed toward developing a synthetic route to 1. The first total synthesis of 1 has been accomplished in a 15-step route in an overall 5.0% yield. The synthetic sample of reniochalistatin E was shown to have similar activity toward HeLa and RPMI-8226 cell lines compared to the natural sample, with IC50 values of 16.9 vs 17.3 μM and 4.5 vs 4.9 μM, respectively. Interestingly, both of the fully deprotected octapeptides constructed toward the synthesis of reniochalistatin E were shown to have cytotoxicity. The route provides a means to probe the structure-activity relationship of 1 and further biological investigations.
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Affiliation(s)
- Anthony Fatino
- Department of Chemistry, Kansas State University , Manhattan, Kansas 66506, United States
| | - Giovanna Baca
- Department of Chemistry, Kansas State University , Manhattan, Kansas 66506, United States
| | - Chamitha Weeramange
- Department of Chemistry, Kansas State University , Manhattan, Kansas 66506, United States
| | - Ryan J Rafferty
- Department of Chemistry, Kansas State University , Manhattan, Kansas 66506, United States
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9
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Shaheen F, Jabeen A, Ashraf S, Nadeem-Ul-Haque M, Shah ZA, Ziaee MA, Dastagir N, Ganesan A. Total synthesis, structural, and biological evaluation of stylissatin A and related analogs. J Pept Sci 2017; 22:607-17. [PMID: 27526945 DOI: 10.1002/psc.2909] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2016] [Revised: 06/28/2016] [Accepted: 07/09/2016] [Indexed: 12/22/2022]
Abstract
The natural product cyclic peptide stylissatin A (1a) was reported to inhibit nitric oxide production in LPS-stimulated murine macrophage RAW 264.7 cells. In the current study, solid-phase total synthesis of stylissatin A was performed by using a safety-catch linker and yielded the peptide with a trans-Phe(7) -Pro(6) linkage, whereas the natural product is the cis rotamer at this position as evidenced by a marked difference in NMR chemical shifts. In order to preclude the possibility of 1b being an epimer of the natural product, we repeated the synthesis using d-allo-Ile in place of l-Ile and a different site for macrocyclization. The resulting product (d-allo-Ile(2) )-stylissatin A (1c) was also found to have the trans-Phe(7) -Pro(6) peptide conformations like rotamer 1b. Applying the second route to the synthesis of stylissatin A itself, we obtained stylissatin A natural rotamer 1a accompanied by rotamer 1b as the major product. Rotamers 1a, 1b, and the epimer 1c were separable by HPLC, and 1a was found to match the natural product in structure and biological activity. Six related analogs 2-7 of stylissatin A were synthesized on Wang resin and characterized by spectral analysis. The natural product (1a), the rotamer (1b), and (d-allo-Ile(2) )-stylissatin A (1c) exhibited significant inhibition of NO(.) . Further investigations were focused on 1b, which also inhibited proliferation of T-cells and inflammatory cytokine IL-2 production. The analogs 2-7 weakly inhibited NO(.) production, but strongly inhibited IL-2 cytokine production compared with synthetic peptide 1b. All analogs inhibited the proliferation of T-cells, with analog 7 having the strongest effect. In the analogs, the Pro(6) residue was replaced by Glu/Ala, and the SAR indicates that the nature of this residue plays a role in the biological function of these peptides. Copyright © 2016 European Peptide Society and John Wiley & Sons, Ltd.
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Affiliation(s)
- Farzana Shaheen
- H. E. J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi, 75270, Pakistan
| | - Almas Jabeen
- Dr. Panjwani Center for Molecular Medicine and Drug Research, International Center for Chemical and Biological Sciences, University of Karachi, Karachi, 75270, Pakistan
| | - Samreen Ashraf
- H. E. J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi, 75270, Pakistan
| | - Muhammad Nadeem-Ul-Haque
- H. E. J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi, 75270, Pakistan
| | - Zafar Ali Shah
- H. E. J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi, 75270, Pakistan
| | - Muhammad Asad Ziaee
- H. E. J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi, 75270, Pakistan
| | - Nida Dastagir
- Dr. Panjwani Center for Molecular Medicine and Drug Research, International Center for Chemical and Biological Sciences, University of Karachi, Karachi, 75270, Pakistan
| | - A Ganesan
- School of Pharmacy, University of East Anglia, Norwich Research Park, Norwich, NR4 7TJ, UK
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Purification and molecular docking study of angiotensin I-converting enzyme (ACE) inhibitory peptides from hydrolysates of marine sponge Stylotella aurantium. Process Biochem 2017. [DOI: 10.1016/j.procbio.2016.12.023] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register]
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11
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Dahiya R, Singh S, Sharma A, Chennupati SV, Maharaj S. First Total Synthesis and Biological Screening of a Proline-Rich Cyclopeptide from a Caribbean Marine Sponge. Mar Drugs 2016; 14:md14120228. [PMID: 27983681 PMCID: PMC5192465 DOI: 10.3390/md14120228] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2016] [Revised: 12/09/2016] [Accepted: 12/12/2016] [Indexed: 12/20/2022] Open
Abstract
A natural heptacyclopeptide, stylissamide G (7), previously isolated from the Bahamian marine sponge Stylissa caribica from the Caribbean Sea, was synthesized via coupling of the tetrapeptide l-phenylalanyl-l-prolyl-l-phenylalanyl-l-proline methyl ester with the tripeptide Boc-l-leucyl-l-isoleucyl-l-proline, followed by cyclization of the linear heptapeptide fragment. The structure of the synthesized cyclooligopeptide was confirmed using quantitative elemental analysis, FT-IR, 1H NMR, 13C NMR and mass spectrometry. Results of pharmacological activity studies indicated that the newly synthesized cycloheptapeptide displayed good anthelmintic potential against Megascoplex konkanensis, Pontoscotex corethruses and Eudrilus eugeniea at 2 mg/mL and in addition, potent antifungal activity against pathogenic Candida albicans and dermatophytes Trichophyton mentagrophytes and Microsporum audouinii at a concentration of 6 μg/mL.
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Affiliation(s)
- Rajiv Dahiya
- Laboratory of Peptide Research and Development, School of Pharmacy, Faculty of Medical Sciences, The University of the West Indies, St. Augustine, Trinidad and Tobago.
| | - Sunil Singh
- Department of Pharmacy, Mewar University, Gangrar, Chittorgarh, Rajasthan 312901, India.
| | - Ajay Sharma
- Department of Pharmacy, College of Health Sciences, Mizan-Tepi University, Mizan Teferi 5140, Ethiopia.
| | - Suresh V Chennupati
- Department of Pharmacy, College of Medical and Health Sciences, Wollega University, P.O. Box 395 Nekemte, Ethiopia.
| | - Sandeep Maharaj
- Laboratory of Peptide Research and Development, School of Pharmacy, Faculty of Medical Sciences, The University of the West Indies, St. Augustine, Trinidad and Tobago.
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12
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Fang WY, Dahiya R, Qin HL, Mourya R, Maharaj S. Natural Proline-Rich Cyclopolypeptides from Marine Organisms: Chemistry, Synthetic Methodologies and Biological Status. Mar Drugs 2016; 14:md14110194. [PMID: 27792168 PMCID: PMC5128737 DOI: 10.3390/md14110194] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2016] [Revised: 10/02/2016] [Accepted: 10/15/2016] [Indexed: 12/17/2022] Open
Abstract
Peptides have gained increased interest as therapeutics during recent years. More than 60 peptide drugs have reached the market for the benefit of patients and several hundreds of novel therapeutic peptides are in preclinical and clinical development. The key contributor to this success is the potent and specific, yet safe, mode of action of peptides. Among the wide range of biologically-active peptides, naturally-occurring marine-derived cyclopolypeptides exhibit a broad range of unusual and potent pharmacological activities. Because of their size and complexity, proline-rich cyclic peptides (PRCPs) occupy a crucial chemical space in drug discovery that may provide useful scaffolds for modulating more challenging biological targets, such as protein-protein interactions and allosteric binding sites. Diverse pharmacological activities of natural cyclic peptides from marine sponges, tunicates and cyanobacteria have encouraged efforts to develop cyclic peptides with well-known synthetic methods, including solid-phase and solution-phase techniques of peptide synthesis. The present review highlights the natural resources, unique structural features and the most relevant biological properties of proline-rich peptides of marine-origin, focusing on the potential therapeutic role that the PRCPs may play as a promising source of new peptide-based novel drugs.
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Affiliation(s)
- Wan-Yin Fang
- School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan 430070, China.
| | - Rajiv Dahiya
- Laboratory of Peptide Research and Development, School of Pharmacy, Faculty of Medical Sciences, The University of the West Indies, Saint Augustine, Trinidad and Tobago, West Indies.
| | - Hua-Li Qin
- School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan 430070, China.
| | - Rita Mourya
- School of Pharmacy, College of Medicine and Health Sciences, University of Gondar, Gondar 196, Ethiopia.
| | - Sandeep Maharaj
- Laboratory of Peptide Research and Development, School of Pharmacy, Faculty of Medical Sciences, The University of the West Indies, Saint Augustine, Trinidad and Tobago, West Indies.
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13
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Agrawal S, Adholeya A, Deshmukh SK. The Pharmacological Potential of Non-ribosomal Peptides from Marine Sponge and Tunicates. Front Pharmacol 2016; 7:333. [PMID: 27826240 PMCID: PMC5078478 DOI: 10.3389/fphar.2016.00333] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Accepted: 09/07/2016] [Indexed: 12/18/2022] Open
Abstract
Marine biodiversity is recognized by a wide and unique array of fascinating structures. The complex associations of marine microorganisms, especially with sponges, bryozoans, and tunicates, make it extremely difficult to define the biosynthetic source of marine natural products or to deduce their ecological significance. Marine sponges and tunicates are important source of novel compounds for drug discovery and development. Majority of these compounds are nitrogen containing and belong to non-ribosomal peptide (NRPs) or mixed polyketide-NRP natural products. Several of these peptides are currently under trial for developing new drugs against various disease areas, including inflammatory, cancer, neurodegenerative disorders, and infectious disease. This review features pharmacologically active NRPs from marine sponge and tunicates based on their biological activities.
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Affiliation(s)
| | | | - Sunil K. Deshmukh
- TERI–Deakin Nano Biotechnology Centre, The Energy and Resources InstituteNew Delhi, India
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Sun J, Cheng W, de Voogd NJ, Proksch P, Lin W. Stylissatins B–D, cycloheptapeptides from the marine sponge Stylissa massa. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.08.024] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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15
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Zhan KX, Jiao WH, Yang F, Li J, Wang SP, Li YS, Han BN, Lin HW. Reniochalistatins A-E, cyclic peptides from the marine sponge Reniochalina stalagmitis. JOURNAL OF NATURAL PRODUCTS 2014; 77:2678-2684. [PMID: 25490132 DOI: 10.1021/np5006778] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Five new cyclic peptides (including four heptapeptides and one octapeptide), reniochalistatins A-E (1-5), were isolated and characterized from the marine sponge Reniochalina stalagmitis collected off Yongxing Island in the South China Sea. Their structures were assigned on the basis of HRESIMS, 1D and 2D NMR spectroscopic data, and MALDI-TOF/TOF data for sequence analysis. The absolute configurations of all of the amino acid residues were determined using chiral-phase HPLC and Marfey's analysis. The cyclic octapeptide reniochalistatin E showed biological activity in various cytotoxicity assays employing different tumor cell lines (RPMI-8226, MGC-803, HL-60, HepG2, and HeLa).
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Affiliation(s)
- Kai-Xuan Zhan
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University , Shenyang 110016, People's Republic of China
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16
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Kita M, Gise B, Kawamura A, Kigoshi H. Stylissatin A, a cyclic peptide that inhibits nitric oxide production from the marine sponge Stylissa massa. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.10.003] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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17
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Shaheen F, Rizvi TS, Musharraf SG, Ganesan A, Xiao K, Townsend JB, Lam KS, Choudhary MI. Solid-phase total synthesis of cherimolacyclopeptide E and discovery of more potent analogues by alanine screening. JOURNAL OF NATURAL PRODUCTS 2012; 75:1882-1887. [PMID: 23148652 DOI: 10.1021/np300266e] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Cherimolacyclopeptide E (1) is a cyclic hexapeptide obtained from Annona cherimola, reported to be cytotoxic against the KB (human nasopharyngeal carcinoma) cell line. The solid-phase total syntheses of this cyclic peptide and its analogues were accomplished by employing FMOC/tert-butyl-protected amino acids and the Kenner sulfonamide safety-catch linker. The synthetic peptide 1 was found to be weakly cytotoxic against four cell lines (MOLT-4, Jurkat T lymphoma, MDA-MB-231, and KB). Analogues 3 and 7, where glycine at positions 2 and 6 of the parent compound was replaced by Ala, exhibited enhanced cytotoxicity against KB (3, IC50 6.3 μM; 7, IC50 7.8 μM) and MDA-MB-231 breast cancer cells (3, IC50 10.2 μM; 7, IC50 7.7 μM), thereby suggesting possible selective targeting of these cancer cells by these peptides. The spectral data of synthetic peptide 1 was found to be similar to that reported for the natural product. However, a striking difference in biological activity was noted, which warrants the re-evaluation of the original natural product for purity and the existence of conformational differences.
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Affiliation(s)
- Farzana Shaheen
- H. E. J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi , Karachi-75270, Pakistan
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18
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Synthesis, docking and anticancer activity studies of D-proline-incorporated wainunuamide. J CHEM SCI 2012. [DOI: 10.1007/s12039-012-0301-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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19
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Abstract
Covering: 2010. Previous review: Nat. Prod. Rep., 2011, 28, 196. This review covers the literature published in 2010 for marine natural products, with 895 citations (590 for the period January to December 2010) referring to compounds isolated from marine microorganisms and phytoplankton, green, brown and red algae, sponges, cnidarians, bryozoans, molluscs, tunicates, echinoderms, mangroves and other intertidal plants and microorganisms. The emphasis is on new compounds (1003 for 2010), together with the relevant biological activities, source organisms and country of origin. Biosynthetic studies, first syntheses, and syntheses that lead to the revision of structures or stereochemistries, have been included.
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Affiliation(s)
- John W Blunt
- Department of Chemistry, University of Canterbury, Christchurch, New Zealand.
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20
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Arai M, Yamano Y, Fujita M, Setiawan A, Kobayashi M. Stylissamide X, a new proline-rich cyclic octapeptide as an inhibitor of cell migration, from an Indonesian marine sponge of Stylissa sp. Bioorg Med Chem Lett 2011; 22:1818-21. [PMID: 22260773 DOI: 10.1016/j.bmcl.2011.10.023] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2011] [Revised: 10/05/2011] [Accepted: 10/07/2011] [Indexed: 11/25/2022]
Abstract
A new proline-rich cyclic octapeptide named stylissamide X (1) was isolated from an Indonesian marine sponge of Stylissa sp. as an inhibitor of cell migration from the guidance of wound-healing assay. The chemical structure of stylissamide X (1) was determined on the basis of spectroscopic analysis, and stereostructure of the amino acids were deduced by Marfey's method. Compound 1 showed inhibitory activity against migration of HeLa cells in the ranges of 0.1-10 μM concentration through both wound-healing assay and chemotaxicell chamber assay, while the cell viability was maintained more than 75% up to 10 μM concentration of 1.
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Affiliation(s)
- Masayoshi Arai
- Graduate School of Pharmaceutical Sciences, Osaka University, Suita, Osaka, Japan.
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21
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Ibrahim SRM, Min CC, Teuscher F, Ebel R, Kakoschke C, Lin W, Wray V, Edrada-Ebel R, Proksch P. Callyaerins A-F and H, new cytotoxic cyclic peptides from the Indonesian marine sponge Callyspongia aerizusa. Bioorg Med Chem 2010; 18:4947-56. [PMID: 20599387 DOI: 10.1016/j.bmc.2010.06.012] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2010] [Revised: 05/26/2010] [Accepted: 06/04/2010] [Indexed: 11/20/2022]
Abstract
Bioassay guided fractionation of the EtOAc fraction of the sponge Callyspongia aerizusa yielded seven new cytotoxic cyclic peptides callyaerins A-F (1-6) and H (8). Their structures were determined using extensive 1D (1H, 13C and DEPT) and 2D (COSY, HMQC, HMBC, TOCSY, and ROESY) NMR and mass spectral (ESI and HRESI-TOF) data. All compounds were cyclic peptides containing ring systems of 5-9 amino acids and side chains of 2-5 amino acids in length. An unusual (Z)-2,3-diaminoacrylic acid unit provided the template for ring closure and afforded the linkage to the peptidic side chain which was always initiated with a proline moiety. All peptides contained three or more proline residues and the remaining residues were predominantly hydrophobic residues with all amino acids present in the l form. Callyaerins A-F (1-6) and H (8) showed biological activity in antibacterial assays and in various cytotoxicity assays employing different tumour cell-lines (L5178Y, HeLa, and PC12). Callyaerins E (5) and H (8) exhibited strong activity against the L5178Y cell line with ED50 values of 0.39 and 0.48 microM, respectively. On the other hand, callyaerin A (1) showed strong inhibitory properties towards C. albicans.
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Affiliation(s)
- Sabrin R M Ibrahim
- Institut für Pharmazeutische Biologie und Biotechnologie, Heinrich-Heine-Universität, Geb. 26.23, Universitätsstrasse 1, D-40225 Düsseldorf, Germany
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22
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Zhang HJ, Yi YH, Yang GJ, Hu MY, Cao GD, Yang F, Lin HW. Proline-containing cyclopeptides from the marine sponge Phakellia fusca. JOURNAL OF NATURAL PRODUCTS 2010; 73:650-655. [PMID: 20345147 DOI: 10.1021/np9008267] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Four new cyclopeptides, phakellistatins 15-18 (2-5), together with five known cyclopeptides, phakellistatin 13 (1), hymenistatin 1, and hymenamides G, H, and J, were isolated from the South China Sea sponge Phakellia fusca. Their structures were elucidated by HR-ESIMS, NMR, and MALDI-TOF/TOF sequence analysis. The absolute configurations of the amino acid residues of 2-5 were assigned to be l by enantioselective HPLC analysis.
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Affiliation(s)
- Hong-Jun Zhang
- Laboratory of Marine Drugs, Department of Pharmacy, Changzheng Hospital, Second Military Medical University, 415 Fengyang Road, Shanghai 200003, People's Republic of China
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23
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Sivonen K, Leikoski N, Fewer DP, Jokela J. Cyanobactins-ribosomal cyclic peptides produced by cyanobacteria. Appl Microbiol Biotechnol 2010; 86:1213-25. [PMID: 20195859 PMCID: PMC2854353 DOI: 10.1007/s00253-010-2482-x] [Citation(s) in RCA: 165] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2009] [Revised: 01/29/2010] [Accepted: 01/29/2010] [Indexed: 11/30/2022]
Abstract
Cyanobactins are small cyclic peptides that are produced by a diverse selection of cyanobacteria living in symbioses as well as terrestrial, marine, or freshwater environments. They include compounds with antimalarial, antitumor, and multidrug reversing activities and potential as pharmaceutical leads. Cyanobactins are produced through the proteolytic cleavage and cyclization of precursor peptides coupled with further posttranslational modifications such as heterocyclization, oxidation, or prenylation of amino acids. Cyanobactin gene clusters encode two proteases which cleave and cyclisize the precursor peptide as well as proteins participating in posttranslational modifications. The bioinformatic mining of cyanobacterial genomes has led to the discovery of novel cyanobactins. Heterologous expression of these gene clusters provided insights into the role of the genes participating in the biosynthesis of cyanobactins and facilitated the rational design of novel peptides. Enzymes participating in the biosynthesis of cyanobactins may prove useful as catalysts for producing novel cyclic peptides in the future. The recent discovery of the cyanobactin biosynthetic pathway in cyanobacteria extends our knowledge of their potential as producers of interesting metabolites.
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Affiliation(s)
- Kaarina Sivonen
- Department of Food and Environmental Sciences, Division of Microbiology, Viikki Biocenter, University of Helsinki, Helsinki, P.O. Box 56, Viikinkaari 9, FIN-00014, Finland.
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Vera B, Vicente J, Rodríguez AD. Isolation and structural elucidation of euryjanicins B-D, proline-containing cycloheptapeptides from the Caribbean marine sponge Prosuberites laughlini. JOURNAL OF NATURAL PRODUCTS 2009; 72:1555-62. [PMID: 19743810 PMCID: PMC5328627 DOI: 10.1021/np9004135] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Three new cyclic peptides, euryjanicins B (2), C (3), and D (4), have been isolated from the Puerto Rican marine sponge Prosuberites laughlini, and the structures were elucidated by chemical degradation, ESIMS/MS, and extensive 2D NMR methods. When tested against the National Cancer Institute 60 tumor cell line panel, all of the purified isolates displayed weak cytotoxicity.
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Affiliation(s)
| | | | - Abimael D. Rodríguez
- To whom correspondence should be addressed. Tel.: +787-764-0000, ext. 4799. Fax: +787-756-8242.
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25
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Vicente J, Vera B, Rodríguez AD, Rodríguez-Escudero I, Raptis RG. Euryjanicin A: a new cycloheptapeptide from the Caribbean marine sponge Prosuberites laughlini. Tetrahedron Lett 2009; 50:4571-4574. [PMID: 20161148 DOI: 10.1016/j.tetlet.2009.05.067] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
A new proline-containing cycloheptapeptide, euryjanicin A (1), has been isolated from the marine sponge Prosuberites laughlini indigenous to Puerto Rico, and its structure established by an X-ray crystal structure determination. The absolute configuration of each amino acid residue was determined by Marfey's method.
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Affiliation(s)
- Jan Vicente
- Department of Chemistry, University of Puerto Rico, P.O. Box 23346, UPR Station, San Juan, Puerto Rico 00931-3346
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26
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Brennan MR, Costello CE, Maleknia SD, Pettit GR, Erickson KL. Stylopeptide 2, a proline-rich cyclodecapeptide from the sponge Stylotella sp. JOURNAL OF NATURAL PRODUCTS 2008; 71:453-456. [PMID: 18197605 DOI: 10.1021/np0704856] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
A new proline-rich cyclodecapeptide, designated stylopeptide 2, has been isolated from a cytotoxic extract of the Papua New Guinea marine sponge Stylotella sp. and found to correspond to structure 1. The structural assignment was based on HRMS collision-induced dissociation tandem mass spectrometry (CID MS/MS), NMR spectroscopic data, and amino acid analysis, which led to assignment of the absolute configuration.
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Affiliation(s)
- Mary R Brennan
- Gustaf H. Carlson School of Chemsitry and Biochemistry, Clark University , Worcester, Massachusetts 01610, USA
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27
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Baumann HI, Keller S, Wolter FE, Nicholson GJ, Jung G, Süssmuth RD, Jüttner F. Planktocyclin, a cyclooctapeptide protease inhibitor produced by the freshwater cyanobacterium Planktothrix rubescens. JOURNAL OF NATURAL PRODUCTS 2007; 70:1611-1615. [PMID: 17935298 DOI: 10.1021/np0700873] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The freshwater cyanobacterium Planktothrix rubescens produces the cyclooctapeptide cyclo(Pro-Gly-Leu-Val-Met-Phe-Gly-Val). The chemical structure is new. This homodetic cyclic octapeptide was named planktocyclin ( 1). It consists solely of proteinogenic l-amino acids and is a strong inhibitor of mammalian trypsin and alpha-chymotrypsin and a moderately active inhibitor of human recombinant caspase-8. Mass spectrometric and 2D-NMR spectroscopic data allowed the determination of its structure. Synthetic planktocyclin was identical to the natural product.
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Affiliation(s)
- Heike I Baumann
- Limnological Station, Institute of Plant Biology, University of Zürich, Seestrasse 187, 8802 Kilchberg, Switzerland.
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28
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29
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Tabudravu JN, Jaspars M, Morris LA, Kettenes-Van Den Bosch JJ, Smith N. Two distinct conformers of the cyclic heptapeptide phakellistatin 2 isolated from the fijian marine sponge stylotellaaurantium. J Org Chem 2002; 67:8593-601. [PMID: 12444643 DOI: 10.1021/jo020482s] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The isolation, structure determination, and solution conformation of two conformers of the cyclic heptapeptide phakellistatin 2 (cyclo-[Phe1-cis-Pro2-Ile3-Ile4-cis-Pro5-Tyr6-cis-Pro7]) isolated from the Fijian marine sponge Stylotella aurantium are reported. The conformers can be isolated separately by HPLC and are stable in methanol solution over a period of weeks as determined by NMR. Their NMR spectra and mass spectral fragmentation patterns differ significantly. Their solution conformations were determined by NOE-restrained molecular dynamics calculations and indicated that the two conformers had different folds, hydrogen bonding patterns, and solvent accessible surfaces. These factors may contribute to the independent stability of the two conformers, and may explain the variable biological activity previously reported for phakellistatin 2.
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Affiliation(s)
- Jioji N Tabudravu
- Marine Natural Products Laboratory, Department of Chemistry, University of Aberdeen, Old Aberdeen, Scotland, UK
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30
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Axinellin C, a proline-rich cyclic octapeptide isolated from the Fijian marine sponge Stylotella aurantium. Tetrahedron 2002. [DOI: 10.1016/s0040-4020(02)00898-0] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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