PMID: 2502630Aug 1, 1989Paper

(3-Amino-2-oxoalkyl)phosphonic acids and their analogues as novel inhibitors of D-alanine:D-alanine ligase

Journal of Medicinal Chemistry
P K ChakravartyT N Mellin

Abstract

The dipeptide D-alanyl-D-alanine is an essential precursor of bacterial peptidoglycan; thus, blocking its formation is a possible target for the design of novel antibacterial agents. The synthesis of this dipeptide by bacterial D-alanine:D-alanine ligase requires ATP. In analogy with glutamine synthetase, we hypothesized a mechanism for this enzyme involving the intermediacy of D-alanyl phosphate. Several (3-amino-2-oxoalkyl)phosphonic acids and their analogues have been synthesized as possible inhibitory mimics of this proposed intermediate. The most active of them, (3(R)-amino-2-oxobutyl)phosphonic acid (8a) and the corresponding aza analogue (22), were effective ligase inhibitors although they had no significant antibacterial activity. The ligase inhibition of these compounds is consistent with an acyl phosphate displacement step in the mechanism of DAla-DAla ligase.

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