Identifying the Catalytic Residue of the ATPase Reaction of DNA Gyrase

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 1993 Dec 1

PMID 8248233

Citations 33

Authors

A P Jackson

A Maxwell

Affiliations

Soon will be listed here.

Abstract

We propose a mechanism for the hydrolysis of ATP by the DNA gyrase B protein in which Glu42 acts as a general base and His38 has a role in aligning and polarizing the glutamate residue. We have tested this mechanism by site-directed mutagenesis, converting Glu42 to Ala, Asp, and Gln, and His38 to Ala. In the presence of wild-type A protein, B proteins bearing the mutations Ala42 and Gln42 show no detectable supercoiling or ATPase activities, while Asp42 and Ala38 proteins have reduced activities. In the DNA cleavage and relaxation reactions of gyrase, which do not require ATP hydrolysis, wild-type and mutant proteins have similar activities. When the 43-kDa N-terminal fragment of the gyrase B protein (which hydrolyzes ATP) contained the mutations Ala42 or Gln42, ATP was bound but not hydrolyzed, supporting the idea that Glu42 is involved in hydrolysis but not nucleotide binding.

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