S-adenosylmethionine may not be essential for signal transduction during bacterial chemotaxis

A. Borczuk, A. Stock, J. Stock

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


We previously showed that a mutant strain of Salmonella typhimurium completely deficient in both the chemoreceptor methylating (CheR) and demethylating (CheB) enzymes can still exhibit chemotaxis to aspartate and other attractants (J. Stock, A. Borczuk, F. Chiou, and J.E.B. Burchenal, Proc. Natl. Acad. Sci. USA 82:8364-8368, 1985). We used this cheR cheB mutant to examine the possibility of an additional requirement for S-adenosylmethionine in chemotaxis besides its role in chemoreceptor methylation. A metE mutation was transudced into a cheR cheB double mutant, and the cells were starved for methionine. Despite the fact that intracellular S-adenosylmethionine dropped from approximately 100 μM to less than 0.2 μM, chemotaxis was largely unaffected. In contrast, a corresponding cheR+ cheB+ metE mutant completely lost its chemotaxis ability after being starved for methionine. We conclude from this observation that the primary requirement for S-adenosylmethionine during bacterial chemotaxis is in the methylation of receptor proteins.

Original languageEnglish (US)
Pages (from-to)3295-3300
Number of pages6
JournalJournal of bacteriology
Issue number7
StatePublished - 1987

All Science Journal Classification (ASJC) codes

  • Molecular Biology
  • Microbiology


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