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Yu JD, Yu DD, Su MZ, Gu YC, Wang H, Guo YW. New Antibacterial Diterpenoids from the South China Sea Soft Coral Klyxum molle. Mar Drugs 2023; 21:362. [PMID: 37367687 DOI: 10.3390/md21060362] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Revised: 06/09/2023] [Accepted: 06/15/2023] [Indexed: 06/28/2023] Open
Abstract
Fifteen new diterpenoids, namely xishaklyanes A-O (1-15), along with three known related ones (16-18), were isolated from the soft coral Klyxum molle collected from Xisha Islands, South China Sea. The stereochemistry of the new compounds was elucidated by a combination of detailed spectroscopic analyses, chemical derivatization, quantum chemical calculations, and comparison with the reported data. The absolute configuration of compound 18 was established by the modified Mosher's method for the first time. In bioassay, some of these compounds exhibited considerable antibacterial activities on fish pathogenic bacteria, and compound 4 showed the most effective activity with MIC of 0.225 μg/mL against Lactococcus garvieae.
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Affiliation(s)
- Jia-Dong Yu
- College of Pharmaceutical Science and Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals, Zhejiang University of Technology, Hangzhou 310014, China
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
| | - Dan-Dan Yu
- Shandong Laboratory of Yantai Drug Discovery, Bohai Rim Advanced Research Institute for Drug Discovery, Yantai 264117, China
| | - Ming-Zhi Su
- Shandong Laboratory of Yantai Drug Discovery, Bohai Rim Advanced Research Institute for Drug Discovery, Yantai 264117, China
| | - Yu-Cheng Gu
- Syngenta, Jealott's Hill International Research Centre, Bracknell RG42 6EY, Berkshire, UK
| | - Hong Wang
- College of Pharmaceutical Science and Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals, Zhejiang University of Technology, Hangzhou 310014, China
| | - Yue-Wei Guo
- College of Pharmaceutical Science and Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals, Zhejiang University of Technology, Hangzhou 310014, China
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
- Shandong Laboratory of Yantai Drug Discovery, Bohai Rim Advanced Research Institute for Drug Discovery, Yantai 264117, China
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Farag MA, Meyer A, Ali SE. Bleaching effect in Sarcophyton spp. soft corals-is there a correlation to their diterpene content? ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:25594-25602. [PMID: 33459982 DOI: 10.1007/s11356-021-12483-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2020] [Accepted: 01/11/2021] [Indexed: 06/12/2023]
Abstract
Rising seawater temperature is one of the greatest threats to the persistence of coral reefs. While great efforts have been made to understand the metabolic costs of thermal acclimation, the exact roles of many secondary metabolites involved in the immediate response exhibited by soft corals remain largely unknown. Herein, an untargeted metabolomics approach using ultra-performance liquid chromatography coupled to high-resolution mass spectrometry (UPLC-MS) was employed to investigate thermal stress-induced modifications to the de novo synthesis of secondary metabolites in two soft coral species, Sarcophyton ehrenbergi and S. glaucum. Exposure to elevated temperature resulted in symbiont photoinhibition primarily via either damage to photosystem II (PSII) or the loss of algal symbionts during coral bleaching. This was suggested by a decrease in pulse amplitude modulated (PAM) measurements of corals incubated at different temperatures. Thermal stress was also found to impair the production of diterpenoid secondary metabolites in soft corals. Principally, reduction in the levels of a number of diterpenes, viz. sarcophytoxide and deoxysarcophytoxide, in heat stressed S. ehrenbergi and S. glaucum was observed indicative that thermal acclimation is energetically costly and will necessitate downstream changes in secondary metabolic pathways. Our data suggest that, while the host controls the production of ecologically important terpenes, when energetic contribution from the algal symbiont is reduced or absent as a result of a bleaching event, energy reserves may be insufficient to maintain the production of such energetically cost chemicals. This study provides for the first time a holistic assessment of secondary metabolite changes imposed in soft corals during exposure and acclimation to elevated temperatures.
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Affiliation(s)
- Mohamed A Farag
- Pharmacognosy Department, College of Pharmacy, Cairo University, Kasr el Aini St. P.B., Cairo, 11562, Egypt.
- Department of Chemistry, School of Sciences & Engineering, The American University in Cairo (AUC), New Cairo, 11835, Egypt.
| | - Achim Meyer
- Leibniz Centre for Tropical Marine Research (ZMT), Fahrenheit Str. 6, 28359, Bremen, Germany
| | - Sara E Ali
- Department of Pharmaceutical Biology, Faculty of Pharmacy & Biotechnology, The German University in Cairo, New Cairo, 11432, Egypt
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Isolation of Lobane and Prenyleudesmane Diterpenoids from the Soft Coral Lobophytum varium. Mar Drugs 2020; 18:md18040223. [PMID: 32331404 PMCID: PMC7230303 DOI: 10.3390/md18040223] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Revised: 04/15/2020] [Accepted: 04/16/2020] [Indexed: 12/11/2022] Open
Abstract
Further chemical investigation of the EtOAc extract of the soft coral Lobophytum varium resulted in the discovery of eleven new diterpenoids lobovarols F–P (1–11) of lobane– and prenyleudesmane–types, along with two known metabolites (12 and 13). The structures of the new metabolites were established by spectroscopic analyses, including 2D NMR experiments. The absolute configuration of 1 was determined using Mosher’s method. The complete assignment of 1H and 13C NMR spectroscopic data of 12 and 13 and the identification of pyran-derived moieties in the prenyleudesmanes were reported for the first time. Anti-inflammatory activities of the isolated compounds in suppressing elastase release and superoxide anion generation in human neutrophils were disclosed for 1, 2, 4, 12, and 13. A stereospecific biosynthesis for lobanes and prenyleudesmanes from the related prenylgermacranes could explain the coexistence of lobanes and prenylgermacranes in L. varium.
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Rahelivao MP, Lübken T, Gruner M, Kataeva O, Ralambondrahety R, Andriamanantoanina H, Checinski MP, Bauer I, Knölker HJ. Isolation and structure elucidation of natural products of three soft corals and a sponge from the coast of Madagascar. Org Biomol Chem 2018; 15:2593-2608. [PMID: 28267183 DOI: 10.1039/c7ob00191f] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
We investigated the three soft corals Sarcophyton stellatum, Capnella fungiformis and Lobophytum crassum and the sponge Pseudoceratina arabica, which have been collected at the coast of Madagascar. In addition to previously known marine natural products, S. stellatum provided the new (+)-enantiomer of the cembranoid (1E,3E,11E)-7,8-epoxycembra-1,3,11,15-tetraene (2). Capnella fungiformis afforded three new natural products, ethyl 5-[(1E,5Z)-2,6-dimethylocta-1,5,7-trienyl]furan-3-carboxylate (6), ethyl 5-[(1E,5E)-2,6-dimethylocta-1,5,7-trienyl]furan-3-carboxylate (7) and the diepoxyguaiane sesquiterpene oxyfungiformin (9a). The extracts of all three soft corals exhibited moderate activities against the malarial parasite Plasmodium falciparum. Extracts of the sponge Pseudoceratina arabica proved to be very active against a series of Gram-positive and Gram-negative bacteria.
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Affiliation(s)
| | - Tilo Lübken
- Department Chemie, Technische Universität Dresden, Bergstr. 66, 01069 Dresden, Germany.
| | - Margit Gruner
- Department Chemie, Technische Universität Dresden, Bergstr. 66, 01069 Dresden, Germany.
| | - Olga Kataeva
- A. M. Butlerov Chemistry Institute, Kazan Federal University, Kremlevskaya Str. 18, Kazan 420008, Russia
| | | | | | | | - Ingmar Bauer
- Department Chemie, Technische Universität Dresden, Bergstr. 66, 01069 Dresden, Germany.
| | - Hans-Joachim Knölker
- Department Chemie, Technische Universität Dresden, Bergstr. 66, 01069 Dresden, Germany.
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Anti-Inflammatory Lobane and Prenyleudesmane Diterpenoids from the Soft Coral Lobophytum varium. Mar Drugs 2017; 15:md15100300. [PMID: 28961211 PMCID: PMC5666408 DOI: 10.3390/md15100300] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2017] [Revised: 09/22/2017] [Accepted: 09/27/2017] [Indexed: 11/19/2022] Open
Abstract
New lobane-based diterpenoids lobovarols A–D (1–4) and a prenyleudesmane-type diterpenoid lobovarol E (5) along with seven known related diterpenoids (6–12) were isolated from the ethyl acetate extract of a Taiwanese soft coral Lobophytum varium. Their structures were identified on the basis of multiple spectroscopic analyses and spectral comparison. The absolute configuration at C-16 of the known compound 11 is reported herein for the first time. The anti-inflammatory activities of compounds 1–12 were assessed by measuring their inhibitory effect on N-formyl-methionyl-leucyl-phenyl-alanine/cytochalasin B (fMLP/CB)-induced superoxide anion generation and elastase release in human neutrophils. Metabolites 2, 5, and 11 were found to show moderate inhibitory activity on the generation of superoxide anion, while compounds 5, 8, 11, and 12 could effectively suppress elastase release in fMLP/CB-stimulated human neutrophil cells at 10 μM. All of the isolated diterpenoids did not exhibit cytotoxic activity (IC50 > 50 μM) towards a limited panel of cancer cell lines.
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Rahelivao MP, Gruner M, Lübken T, Islamov D, Kataeva O, Andriamanantoanina H, Bauer I, Knölker HJ. Chemical constituents of the soft corals Sinularia vanderlandi and Sinularia gravis from the coast of Madagascar. Org Biomol Chem 2015; 14:989-1001. [PMID: 26626232 DOI: 10.1039/c5ob02280k] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The crude extracts of the Madagascan soft corals Sinularia vanderlandi and Sinularia gravis (Alcyoniidae) showed activity against Plasmodium falciparum which led us to study their chemical constituents. The new cadinane-type sesquiterpenoid vanderlandin (1) has been obtained from S. vanderlandi along with 24-methylenecholesterol (2). Four new compounds, the spatane-type diterpenoid gravilin (3), the monoalkylmonoacylglycerol 4, the dihomoditerpenoid ketone 5, and isodecaryiol (9), along with the three known compounds (+)-(S)-geranyllinalool (6), (-)-(R)-nephthenol (7), and 11,12-epoxysarcophytol A (8) have been isolated from the methanol extract of S. gravis. The structures were elucidated based on extensive spectroscopic methods, in particular various 2D NMR techniques. The structure of isodecaryiol (9) including its absolute configuration could be confirmed by X-ray diffraction.
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Govindam SV, Yoshioka Y, Kanamoto A, Fujiwara T, Okamoto T, Ojika M. Cyclolobatriene, a novel prenylated germacrene diterpene, from the soft coral Lobophytum pauciflorum. Bioorg Med Chem 2012; 20:687-92. [DOI: 10.1016/j.bmc.2011.12.012] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2011] [Revised: 12/06/2011] [Accepted: 12/07/2011] [Indexed: 10/14/2022]
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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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Li WD, Li Y, Mao JM, Li YL. Studies on macrocyclic diterpenoids. V. Synthesis of (±)-sarcophytol-A benzyl ether. CHINESE J CHEM 2010. [DOI: 10.1002/cjoc.19930110209] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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10
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New lobane and cembrane diterpenes from two comorian soft corals. Mar Drugs 2010; 8:359-72. [PMID: 20390110 PMCID: PMC2852843 DOI: 10.3390/md8020359] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2010] [Revised: 02/08/2010] [Accepted: 02/20/2010] [Indexed: 01/24/2023] Open
Abstract
Preliminary biological investigation of a collection of Comorian soft corals resulted in the selection of two specimens, one of Sarcophyton and the other of Lobophytum, on the basis of their toxicity on larvae of the brine shrimp (Artemia salina) and inhibition of acetylcholinesterase, respectively. Bioassay-guided fractionations provided a known antitumor promoter cembrane diterpenoid, (+)-sarcophytol-A (1), along with a new lobane diterpenoid, carbomethoxyfuscol (2), from Sarcophyton sp., and a new cembranoid, crassumolide E (3), from Lobophytum sp. The structures of compounds 1–3 were determined by spectroscopic analysis and by comparison of the spectral data with previously reported values. The cembranoid 3 was found to exhibit a moderate inhibitory effect on acetylcholinesterase.
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Saleh MB, Kerr RG. Identification of the Cyclase Product and its First Oxidation Product in the Biosynthesis of Fuscol and Fuscosides. Aust J Chem 2010. [DOI: 10.1071/ch10057] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Fuscol and the related fuscosides are diterpenes isolated from the Caribbean gorgonian Eunicea fusca, which exhibit potent anti-inflammatory activity with a selective action against leukotriene production in murine models. This report describes the isolation and characterization of the diterpene cyclase product leading to these natural products. The cyclase product has been assigned the trivial name eunicene A and was identified through a radioactivity-guided isolation. Additional biosynthetic experiments conducted by incubating a cell-free extract of E. fusca with 3H-labelled metabolites confirmed the involvement of this unsaturated hydrocarbon in the production of fuscol and fuscosides.
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13
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Hagiwara H, Abe F, Uda H. Bicycloannulation of α-bromo α,β-unsaturated esters; synthesis of the tricyclo[4.4.0.01,5]decane framework and its congeners. ACTA ACUST UNITED AC 1993. [DOI: 10.1039/p19930002651] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Wahlberg I, Eklund AM. Cembranoids, Pseudopteranoids, and Cubitanoids of Natural Occurrence. FORTSCHRITTE DER CHEMIE ORGANISCHER NATURSTOFFE / PROGRESS IN THE CHEMISTRY OF ORGANIC NATURAL PRODUCTS 1992. [DOI: 10.1007/978-3-7091-9150-7_2] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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Mao J, Li W, Li Y, Li Y, Liang X, Wang C. A Convergent Synthesis of Sarcophytol-A Precursor 3,7,11,15-Tetramethyl-13-benzoxyl-14-oxo-2(E), 6(E), 10(E)-hexadecatrienal. SYNTHETIC COMMUN 1991. [DOI: 10.1080/00397919108021291] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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16
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Lack of predictability in terpenoid function Multiple roles and integration with related adaptations in soft corals. J Chem Ecol 1990; 16:273-89. [DOI: 10.1007/bf01021284] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/1989] [Accepted: 03/17/1989] [Indexed: 11/27/2022]
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17
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Structures and possible functions of epoxypukalide and pukalide. J Chem Ecol 1989; 15:1177-91. [DOI: 10.1007/bf01014821] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/1988] [Accepted: 05/23/1988] [Indexed: 10/25/2022]
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