Direct and stereospecific interaction of amphidinol 3 with sterol in lipid bilayers

Rafael Atillo Espiritu, Nobuaki Matsumori, Masashi Tsuda, Michio Murata

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)


Amphidinol 3 (AM3), a polyhydroxy-polyene metabolite from the dinoflagellate Amphidinium klebsii, possesses potent antifungal activity. Although AM3 permeabilizes phospholipid membranes only in the presence of sterol, the detailed molecular basis by which AM3 recognizes sterols in membranes remains unknown. Here, we investigated the molecular interaction between sterols and AM3 in membranes from the viewpoint of stereospecific molecular recognition using ergosterol, cholesterol, and epicholesterol, which is the 3-OH epimer of cholesterol. Dye leakage assays, surface plasmon resonance experiments, 2H and 31P NMR measurements, and microscopic observations revealed that AM3 directly interacts with membrane sterols through the strict molecular recognition of the stereochemistry of the sterol 3-OH group. The direct interaction enhances the membrane binding efficiency of AM3, which subsequently permeabilizes membranes without altering membrane integrity.

Original languageEnglish
Pages (from-to)3287-3293
Number of pages7
Issue number20
Publication statusPublished - May 27 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Biochemistry


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