Chemoattractants Elicit Methylation of Specific Polypeptides in Spirochaeta Aurantia

Overview

Journal J Bacteriol

Publisher American Society for Microbiology

Specialty Microbiology

Date 1983 Oct 1

PMID 6413498

Citations 11

Authors

S Kathariou

E P Greenberg

Affiliations

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Abstract

On the basis of this investigation, chemotaxis in Spirochaeta aurantia correlates with methylation of specific polypeptides which are presumed to be analogous to the methyl-accepting chemotaxis proteins (MCPs) in bacteria such as Escherichia coli. The polypeptides exhibited apparent molecular weights in the range of 55,000 to 65,000. Generally, two major presumptive MCP bands and three minor bands were observed on sodium dodecyl sulfate-polyacrylamide gels. Upon addition of D-glucose to S. aurantia cells, methylation of the presumptive MCPs increased for 10 to 12 min to a level greater than 4 times the level of methylation in the absence of D-glucose. Removal of D-glucose resulted in a decrease in methylation of the presumptive MCPs to a level similar to that in unstimulated cells. All attractants tested, including a non-metabolizable attractant (alpha-methyl-D-glucoside) stimulated methylation of the presumptive MCPs (from 1.7 to 4.3 times the level of methylation in unstimulated cells). D-Mannitol, a metabolizable sugar which is not an attractant for S. aurantia, did not stimulate methylation. Stimulation of methylation by D-galactose occurred in cells induced for D-galactose taxis but not in uninduced cells. These data are indicative of an evolutionary relationship between the chemotaxis systems of spirochetes and of flagellated bacteria.

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