A key to understanding the properties of functional molecules is to determine their conformation in solution. A conformational analysis procedure that relies on quantum mechanical calculations and the widely used DP4+ probability was evaluated to decipher the structural information encoded in NMR chemical shifts. The results underscore the potential utility of using NMR chemical shifts in advancing conformational analysis studies of complex molecules in solution.
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http://dx.doi.org/10.1021/acs.orglett.4c01642 | DOI Listing |
Toxins (Basel)
January 2025
Department of Oceanography, Kunsan National University, 558 Daehak-ro, Gunsan 54150, Republic of Korea.
, a dinoflagellate responsible for producing diarrhetic shellfish poisoning (DSP) toxins, poses significant threats to marine ecosystems, aquaculture industries, and human health. DSP toxins, including okadaic acid (OA), dinophysis toxin (DTX), and their diverse derivatives, continue to be identified and characterized. In this study, we report the isolation of four new diol esters of OA/DTX-1 from large-scale cultures of .
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January 2025
NextGen Precision Health, Department of Radiology, University of Missouri Columbia, 1030 Hitt Street, Columbia, MO 65201, USA.
: The increased SNR available at 7T combined with fast readout trajectories enables accelerated spectroscopic imaging acquisitions for clinical applications. In this report, we evaluate the performance of a Hadamard slice encoding strategy with a 2D rosette trajectory for multi-slice fast spectroscopic imaging at 7T. : Moderate-TE (~40 ms) spin echo and J-refocused polarization transfer sequences were acquired with simultaneous Hadamard multi-slice excitations and rosette in-plane encoding.
View Article and Find Full Text PDFMar Drugs
January 2025
G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far Eastern Branch, Russian Academy of Sciences, 159/2, Prospect 100 Let Vladivostoku, Vladivostok 690022, Russia.
Some marine and extremophilic microorganisms are capable of synthesizing sulfated polysaccharides with a unique structure. A number of studies indicate significant biological properties of individual sulfated polysaccharides, such as antiproliferative activity, which makes them a promising area for further research. In this study, the capsular polysaccharide (CPS) was obtained from the bacterium KMM 1449, isolated from a marine sediment sample collected along the shore of the Sea of Japan.
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December 2024
School of Pharmaceutical Sciences, GBRCE for Functional Molecular Engineering, Sun Yat-sen University, Guangzhou 510006, China.
One new gliotoxin derivative fumianthrogliotoxin (), one new indoquizoline alkaloid 3-(methyl propionate) indoquizoline (), and three novel indole alkaloids, anthroxyindole (), (±)-asperfumiindole A (), and (±)-asperfumiindole B (), together with 16 known compounds (-), were isolated from the culture of deep-sea derived fungus AF1. Their chemical structures and absolute configurations were determined through the analysis of NMR data in combination with electronic circular dichroism (ECD) calculations and other spectroscopic analyses. Compounds - and - were evaluated for anti-pulmonary fibrosis activity.
View Article and Find Full Text PDFJ Fungi (Basel)
December 2024
Institute of Environmental, Chemical and Pharmaceutical Sciences, Federal University of São Paulo, Diadema 09972-270, SP, Brazil.
Endophytic fungi are increasingly being recognized for their diverse metabolites that may exhibit antimicrobial properties. In our study, we isolated seven endophytic fungal strains from , which were identified as , , , , , and (with two isolates from the same species). Furthermore, the antimicrobial activity of the extracts was assessed, revealing that the extract from demonstrated activity against .
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