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Biochemistry. 1982 Jun 8;21(12):2857-62.

Inhibition of the RTEM beta-lactamase from Escherichia coli. Interaction of the enzyme with derivatives of olivanic acid.

Abstract

From chemical and kinetic studies of the interaction of the RTEM beta-lactamase from Escherichia coli with three derivatives of olivanic acid, MM22382 (1), MM13902 (2), and MM4550 (3), a mechanism for the inhibition of the enzyme by these compounds is proposed: the interaction proceeds by formation of an acyl-enzyme, the delta 2-pyrroline, which may either deacylate or undergo tautomerization to the more tightly bound delta 1-pyrroline. The ability of olivanic acids to inhibit the enzyme thus depends on the partitioning of the acyl-enzyme to the delta 1-pyrroline ( a process that competes with the normal hydrolytic pathway) and on the rate of regeneration of free enzyme from this complex.

PMID:
7049231
DOI:
10.1021/bi00541a008
[Indexed for MEDLINE]

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