Escherichia coli TehB requires S-adenosylmethionine as a cofactor to mediate tellurite resistance

M. Liu, R. J. Turner, T. L. Winstone, A. Saetre, M. Dyllick-Brenzinger, G. Jickling, L. W. Tari, J. H. Weiner, D. E. Taylor

Research output: Contribution to journalArticle

29 Scopus citations

Abstract

The Escherichia coli chromosomal determinant for tellurite resistance consists of two genes (tehA and tehB) which, when expressed on a multicopy plasmid, confer resistance to K2TeO3 at 128 μg/ml, compared to the MIC of 2 μg/ml for the wild type. TehB is a cytoplasmic protein which possesses three conserved motifs (I, II, and III) found in S-adenosyl-L-methionine (SAM)-dependent non-nucleic acid methyltransferases. Replacement of the conserved aspartate residue in motif I by asparagine or alanine, or of the conserved phenylalanine in motif II by tyrosine or alanine, decreased resistance to background levels. Our results are consistent with motifs I and II in TehB being involved in SAM binding. Additionally, conformational changes in TehB are observed upon binding of both tellurite and SAM. The hydrodynamic radius of TehB measured by dynamic light scattering showed a ~20% decrease upon binding of both tellurite and SAM. These data suggest that TehB utilizes a methyltransferase activity in the detoxification of tellurite.

Original languageEnglish (US)
Pages (from-to)6509-6513
Number of pages5
JournalJournal of Bacteriology
Volume182
Issue number22
DOIs
StatePublished - 2000
Externally publishedYes

ASJC Scopus subject areas

  • Applied Microbiology and Biotechnology
  • Immunology

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    Liu, M., Turner, R. J., Winstone, T. L., Saetre, A., Dyllick-Brenzinger, M., Jickling, G., Tari, L. W., Weiner, J. H., & Taylor, D. E. (2000). Escherichia coli TehB requires S-adenosylmethionine as a cofactor to mediate tellurite resistance. Journal of Bacteriology, 182(22), 6509-6513. https://doi.org/10.1128/JB.182.22.6509-6513.2000