Structural Features of Methyl-accepting Taxis Proteins Conserved Between Archaebacteria and Eubacteria Revealed by Antigenic Cross-reaction

Overview

Journal J Bacteriol

Publisher American Society for Microbiology

Specialty Microbiology

Date 1991 Sep 1

PMID 1909323

Citations 17

Authors

M Alam

G L Hazelbauer

Affiliations

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Abstract

A number of eubacterial species contain methyl-accepting taxis proteins that are antigenically and thus structurally related to the well-characterized methyl-accepting chemotaxis proteins of Escherichia coli. Recent studies of the archaebacterium Halobacterium halobium have characterized methyl-accepting taxis proteins that in some ways resemble and in other ways differ from the analogous eubacterial proteins. We used immunoblotting with antisera raised to E. coli transducers to probe shared structural features of methyl-accepting proteins from archaebacteria and eubacteria and found substantial antigenic relationships. This implies that the genes for the contemporary methyl-accepting proteins are related through an ancestral gene that existed before the divergence of arachaebacteria and eubacteria. Analysis by immunoblot of mutants of H. halobium defective in taxis revealed that some strains were deficient in covalent modification of methyl-accepting proteins although the proteins themselves were present, while other strains appeared to be missing specific methyl-accepting proteins.

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