Document Detail

Quinolone action in Escherichia coli cells carrying gyrA and gyrB mutations.
MedLine Citation:
PMID:  8384139     Owner:  NLM     Status:  MEDLINE    
We have isolated spontaneous mutant strains of Escherichia coli KL16 showing different levels of nalidixic acid (NAL) resistance. From 40 independent mutants, 36 had gyrA and four had gyrB mutations. Most of the gyrA mutations (30/36) conferred high level NAL resistance. In contrast, the only gyrB mutation that conferred a relatively high level of NAL resistance also determined enhanced susceptibility to quinolones with a piperazinyl substituent at C7 position of the quinolone ring (amphoteric quinolones). This gyrB mutation (denoted gyrB1604), jointly with a gyrA mutation (denoted gyrA972) which confers a high level of quinolone resistance, were used to construct strain IC2476, carrying the two gyr mutant alleles. The susceptibility of this strain to amphoteric quinolones (pipemidic acid, norfloxacin and ciprofloxacin) was similar to that of the gyrA972 single mutant. This result indicates that the change in GyrA subunit which determines a high level of quinolone-resistance has the capacity to mask the hypersusceptibility to amphoteric quinolones promoted by the GyrB1604 mutant subunit. This capacity was further confirmed by studying the effects of ciprofloxacin (CFX) on gyrase inhibition in the gyrA972 gyrB1604 strain.
G Herrera; V Aleixandra; A Urios; M Blanco
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  FEMS microbiology letters     Volume:  106     ISSN:  0378-1097     ISO Abbreviation:  FEMS Microbiol. Lett.     Publication Date:  1993 Jan 
Date Detail:
Created Date:  1993-04-20     Completed Date:  1993-04-20     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7705721     Medline TA:  FEMS Microbiol Lett     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  187-91     Citation Subset:  IM    
Instituto de Investigaciones Citológicas, Fundación Valenciana de Investigaciones Biomédicas, Spain.
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MeSH Terms
Anti-Infective Agents / pharmacology*
DNA Gyrase
DNA Topoisomerases, Type II / genetics*,  physiology
Drug Resistance, Microbial
Escherichia coli / drug effects*,  genetics
Microbial Sensitivity Tests
Nalidixic Acid / pharmacology
Structure-Activity Relationship
Reg. No./Substance:
0/Anti-Infective Agents; 389-08-2/Nalidixic Acid; EC 5.99.1.-/DNA Gyrase; EC Topoisomerases, Type II

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