Phenotypic revertant mutations of a new OmpR2 mutant (V203Q) of Escherichia coli lie in the envZ gene, which encodes the OmpR kinase

S. L. Harlocker, A. Rampersaud, W. P. Yang, M. Inouye

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

The Escherichia coli ompR2 allele ompR472 contains a valine-to-methionine point mutation at position 203, resulting in an OmpF-constitutive OmpC- outer membrane phenotype. In the present study, OmpR residue V-203 was replaced with glutamine (V203Q mutation), resulting in the same outer membrane phenotype. However, unlike the OmpF(c) OmpC- phenotype conferred by the OmpR(V203M) mutant protein, the OmpF(c) OmpC- phenotype produced by the OmpR(V203Q) mutation was suppressed by the envZ11(T247R) allele. Additional suppressors of OmpR(V203Q) were isolated by random mutagenesis. All suppressor mutations were found in the envZ gene and conferred an OmpC+ OmpF- phenotype in the presence of the wild-type ompR. These envZ11-like mutations mapped to a region different from those previously reported and were incapable of suppressing the ompR(V203M) allele. Our results indicate that while methionine or glutamine replacements could cause similar effects on OmpF and OmpC expression, they conferred different abilities on the mutant proteins to be suppressed by envZ.

Original languageEnglish (US)
Pages (from-to)1956-1960
Number of pages5
JournalJournal of bacteriology
Volume175
Issue number7
DOIs
StatePublished - 1993

All Science Journal Classification (ASJC) codes

  • Molecular Biology
  • Microbiology

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