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polyene antimycotic
Polyene antimycotics, sometimes referred to as polyene antibiotics, are a class of antimicrobial polyene compounds that target fungi. These polyene antimycotics are typically obtained from some species of ''Streptomyces'' bacteria. The polyenes bind to ergosterol in the fungal cell membrane and thus weakens it, causing leakage of K+ and Na+ ions, which may contribute to fungal cell death. Amphotericin B, nystatin, and natamycin are examples of polyene antimycotics. They are a subgroup of macrolides.
==Structures==
Their chemical structures feature a large ring of atoms (in essence, a cyclic ester ring) containing multiple conjugated carbon-carbon double bonds (hence ''polyene'') on one side of the ring and multiple hydroxyl groups bonded to the other side of the ring. Their structures also often have a ''d''-mycosamine (a type of amino-glycoside) group bonded to the molecule.〔(Solution NMR structure of five representative glycosylated polyene macrolide antibiotics )〕 The series of conjugated double bonds typically absorbs strongly in the ultraviolet-visible region of the electromagnetic spectrum, often resulting in the polyene antibiotics having a yellow color.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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