1887

Abstract

The structure–activity relationships of different nikkomycins were studied to evaluate the structural requirements for a potent chitin synthase inhibitor. We investigated the transport of the nikkomycins via the peptide transport system of the yeast and determined the kinetic parameters for nikkomycin Z uptake [ = 24 μM, = 2·2 nmol min (mg dry wt)]. We demonstrated that the -methyl group of the N-terminal amino acid of dipeptide nikkomycins protects the molecule against peptidase activity in crude cell-extracts of different fungi. Furthermore, the relationship between inhibition constants for chitin synthase, transport of the nikkomycins via the peptide transport system, susceptibility to degradation by cellular proteases and whole-cell activity of the nikkomycins are discussed.

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1991-08-01
2021-08-04
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