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. 1991 Feb;35(2):387-9.
doi: 10.1128/AAC.35.2.387.

4-Quinolone resistance mutations in the DNA gyrase of Escherichia coli clinical isolates identified by using the polymerase chain reaction

M Oram  1 , L M Fisher
Affiliations

4-Quinolone resistance mutations in the DNA gyrase of Escherichia coli clinical isolates identified by using the polymerase chain reaction

M Oram et al. Antimicrob Agents Chemother. 1991 Feb.

Abstract

Seven nalidixic acid-resistant clinical isolates of Escherichia coli were shown to carry resistance mutations in their gyrase A proteins. Six had serine-83 to leucine or tryptophan changes; the seventh had an aspartate-87 to valine substitution. The frequent occurrence of a mutation at serine-83 implies a key role for this residue in quinolone action.

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