Two new members of the OmpR superfamily detected by homology to a sensor-binding core domain

Terry L. Timme, Charles B. Lawrence, Robb E. Moses

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

The OmpR superfamily includes proteins that act as transcriptional regulators of operons that respond to environmental stimuli. A homologous domain near the N-terminus, termed a sensor-binding core domain, is thought to play a role in recognition of a signal transduction protein. We have identified two previously unrecognized members of this regulator family of proteins: a 23.8-kd protein transcribed from the uvrC transcription unit and the PgtA gene product, which is a phosphoglycerate transport regulatory protein. The sensor-binding core domain is also present in four proteins that regulate bacterial sporulation and chemotaxis. The 23.8-kd protein also has sequence similarity to elongation factor Tu and two regulatory proteins: HtpR, the heat-shock regulatory protein, and TraJ, a regulator of expression of genes involved in conjugation. There is a 77-amino acid region near the C-terminus of the 23.8-kd protein that has 30% similarity with a 28.1-kd protein coded for by an open reading frame 5′ to the reading frame of the 23.8-kd protein in the uvrC transcription unit. Genetic distance analysis of amino acid sequences of proteins with a sensor-binding core domain suggests that the 23.8-kd protein and the chemotaxis regulatory proteins are distantly related to the other regulatory proteins in the OmpR superfamily.

Original languageEnglish (US)
Pages (from-to)545-552
Number of pages8
JournalJournal of Molecular Evolution
Volume28
Issue number6
DOIs
StatePublished - Jun 1989

Keywords

  • OmpR superfamily
  • Regulatory proteins
  • pgtA gene
  • uvrC operon

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Molecular Biology
  • Genetics

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