Mutations Affecting the Rossman Fold of Isoleucyl-tRNA Synthetase Are Correlated with Low-Level Mupirocin Resistance in Staphylococcus aureus

Author:

Antonio Martin1,McFerran Neil2,Pallen Mark J.1

Affiliation:

1. Microbial Genomics and Pathogenesis Unit, Division of Immunity and Infection, The Medical School, University of Birmingham, Birmingham, BT15 2TT

2. Department of Biochemistry, The Queen's University of Belfast, Belfast, BT12 6BN, United Kingdom

Abstract

ABSTRACT The isoleucyl-tRNA synthetase ( ileS ) gene was sequenced in toto from 9 and in part from 31 Staphylococcus aureus strains with various degrees of susceptibility to mupirocin. All strains for which the mupirocin MIC was greater than 8 μg/ml contained point mutations affecting the Rossman fold via Val-to-Phe changes at either residue 588 (V588F) or residue 631 (V631F). The importance of the V588F mutation was confirmed by an allele-specific PCR survey of 32 additional strains. Additional mutations of uncertain significance were found in residues clustered on the surface of the IleS protein.

Publisher

American Society for Microbiology

Subject

Infectious Diseases,Pharmacology (medical),Pharmacology

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