Five new eudensamane-type sesquiterpene lactones, clasamanes A-E (-), three new dolabellane-type diterpenes, clabellanes A-C (-), and fifteen known compounds (-) were isolated from the ethanolic extract of Taiwanese soft coral spp. The structures of all undescribed components (-) were determined by analysis of IR, mass, NMR, and UV spectroscopic data. The absolute configuration of new compounds was determined by using circular dichroism and DP4+ calculations. The cytotoxic activities of all isolated marine natural products were evaluated. Compound showed a significant cytotoxic effect against oral cancer cell line (Ca9-22) with an IC value of 7.26 ± 0.17 μg/mL.
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http://dx.doi.org/10.3390/md21100529 | DOI Listing |
Mar Drugs
December 2024
Shandong Laboratory of Yantai Drug Discovery, Bohai Rim Advanced Research Institute for Drug Discovery, Yantai 264117, China.
Two new cembrane-derived tricyclic diterpenes belonging to the sarcophytin family, namely 4-hydroxy-chatancin () and sarcotoroid (), together with two known related ones ( and ), were isolated from the soft coral collected off Ximao Island in the South China Sea. The structures of the new compounds were elucidated by extensive spectroscopic analysis, a quantum mechanical nuclear magnetic resonance (QM-NMR) method, a time-dependent density functional theory electronic circular dichroism (TDDFT-ECD) calculation, X-ray diffraction analysis, and comparison with the reported data in the literature. A plausible biosynthetic pathway of compounds - was proposed, involving undergoing a transannular Diels-Alder cycloaddition.
View Article and Find Full Text PDFMar Drugs
November 2024
Jiangsu Key Laboratory for Functional Substances of Chinese Medicine, Nanjing University of Chinese Medicine, Nanjing 210023, China.
Cembranoid diterpenes are characteristic compounds of soft corals with diverse structures and significant activities, making them an important source of drug lead compounds. In this paper, five new cembranoid diterpenes, meijicrassolins A-E (-), were isolated from the soft coral , along with five previously reported compounds (-). The structures and absolute configuration for new compounds - were assigned by extensive spectroscopic analysis, single-crystal X-ray crystallography, quantum mechanical nuclear magnetic resonance (QM-NMR), and time-dependent density functional theory/electronic circular dichroism (TDDFT/ECD) calculations.
View Article and Find Full Text PDFEnviron Microbiol
December 2024
Department of Biology and Centre for Environmental and Marine Studies (CESAM), University of Aveiro, Campus Universitário de Santiago, Aveiro, Portugal.
Previous studies on disease in coral reef organisms have neglected the natural distribution of potential pathogens and the genetic factors that underlie disease incidence. This study explores the intricate associations between hosts, microbial communities, putative pathogens, antibiotic resistance genes (ARGs) and virulence factors (VFs) across diverse coral reef biotopes. We observed a substantial compositional overlap of putative bacterial pathogens, VFs and ARGs across biotopes, consistent with the 'everything is everywhere, but the environment selects' hypothesis.
View Article and Find Full Text PDFMar Environ Res
December 2024
Institut National de Recherche Halieutique (INRH), Casablanca 20100, Morocco. Electronic address:
The recent decline in the health status of deep-sea habitats around the world has pushed the need to document and map their distribution to preserve them in their marine ecosystems. This work describes deep-water coral habitats (133-729 m) and their associated communities, based on nine ROV video transects. These transects cover a 171 km sub-seafloor profile within a predefined 5560 km area along the North Atlantic coast of Morocco, surveyed in 2020 as part of a coral habitat mapping study under the FAO-NANSEN programme.
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December 2024
Department of Invertebrate Zoology and Geology, California Academy of Sciences, San Francisco, California, United States.
The tropical Indo-Pacific aeolid nudibranchs of the Fionidae are poorly known and have not been studied in a concerted manner. Many undescribed species are found throughout the Indian and Pacific Oceans and are concentrated in the Coral Triangle. With the recent publication of a revised systematic arrangement of the Fionidae, documentation and description of new taxa of Fionidae is especially warranted.
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