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. 1986 Apr;166(1):275–280. doi: 10.1128/jb.166.1.275-280.1986

Inversion of aerotactic response in Escherichia coli deficient in cheB protein methylesterase.

C V Dang, M Niwano, J Ryu, B L Taylor
PMCID: PMC214587  PMID: 3007436

Abstract

Mutants of Escherichia coli and Salmonella typhimurium that were deficient in protein methylesterase activity encoded by cheB had an inverted response to oxygen; they were repelled by concentrations of oxygen that attract wild-type bacteria. Normal responses to oxygen and phosphotransferase substrates were observed in mutants that were deficient in protein methyltransferase (CheR) and the methyl-accepting transducing proteins (Tsr, Tar, Trg). However, the methylation-independent response to oxygen was modified by the loss of esterase activity. The inversion was apparently effected by the amidated Tsr protein present in cheB tsr+ mutants because aerotaxis was normal in cheB tsr strains. Chemotaxis to phosphotransferase sugars was normal in cheB mutants provided the extreme clockwise bias of the flagellar motors was modified to increase the probability of counterclockwise rotation.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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