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J Nat Prod. 2012 Feb 24;75(2):271-4. doi: 10.1021/np200720v. Epub 2012 Feb 13.

Flavimycins A and B, dimeric 1,3-dihydroisobenzofurans with peptide deformylase inhibitory activity from Aspergillus flavipes.

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Korea Research Institute of Bioscience and Biotechnology , Yusong, Daejeon 305-806, Republic of Korea.


Flavimycins A (1) and B (2), novel dimeric 1,3-dihydroisobenzofurans, were isolated as inhibitors of peptide deformylase from cultures of Aspergillus flavipes. Their chemical structures were established by NMR and MS data analysis. Compounds 1 and 2 exist as epimeric mixtures at C-1 through fast hemiacetal-aldehyde tautomerism. Compounds 1 and 2 inhibited Staphylococcus aureus peptide deformylase with IC₅₀ values of 35.8 and 100.1 μM, respectively. Consistent with their PDF inhibition, 1 showed two times stronger antibacterial activity than 2 on S. aureus including MRSA, with MIC values of 32-64 μg/mL.

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