ArticleNatural products and bioprospecting2026
Eight new α-pyrone and γ-butenolide derivatives from the plant endophytic fungus Diaporthe sp. CCY4.
Article in Natural products and bioprospecting, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Five new α-pyrones, diaporpyrones G-K (1-5) and three new γ-butenolide derivatives, porbutenolides A-C (6-8), along with seven known compounds (9-15), were isolated from the culture extract of the endophytic fungus Diaporthe sp. CCY4. Their structures were elucidated by comprehensive spectroscopic analysis, including 1D/2D NMR and HRESIMS data. The absolute configurations of 7 and 8 were assigned using electronic circular dichroism (ECD) calculations. All compounds were evaluated for inhibitory activity against ubiquitin-specific peptidase 4 (USP4). Compounds 2, 5, 9, and 13 exhibited significant anti-ubiquitination effects at 40 μM, with 13 showing the most potent inhibition (IC
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