Abstract
A novel sarsolenane diterpene, named secodihydrosarsolenone (1), as a minor component was obtained from the South China Sea soft coral Sarcophyton trocheliophorum Marenzeller. Its structure was elucidated by detailed spectroscopic analysis. Compound 1 exhibited moderate inhibitory activity (IC50=13.7 µmol•L−1) against protein tyrosine phosphatase 1B (PTP1B), a key target for the treatment of type 2 diabetes, representing the first report of PTP1B inhibitory activity for sarsolenane diterpenes. This discovery promotes computational prediction of binding mode between the enzyme and the metabolite, suggesting a crucial role of the residues Tyr46, Ser216 and Arg221 in the binding action.
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