Characterization of Gram-positive tellurite resistance encoded by the Streptococcus pneumoniae tehB gene

Authors

  • Mingfu Liu,

    1. Department of Biological Sciences and Medical Microbiology and Immunology, University of Alberta, Edmonton, Alta T6G 2H7, Canada
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  • Diane E Taylor

    Corresponding author
    1. Department of Biological Sciences and Medical Microbiology and Immunology, University of Alberta, Edmonton, Alta T6G 2H7, Canada
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*Corresponding author. Tel.: +1 (403) 492 4777; Fax: +1 (403) 4927521; E-mail: diane.taylor@ualberta.ca

Abstract

Streptococcus pneumoniae is a Gram-positive bacterium which is naturally resistant to tellurite. In this study, we cloned and sequenced a homologue of the Escherichia coli tellurite resistance gene tehB from S. pneumoniae. It encoded a protein of 284 amino acids which is 86 residues longer than E. coli TehB, but similar in size to Haemophilus influenzae TehB and Eikenella corrodens hemagglutinin (Hag1) as well as homologues from Actinobacillus actinomycetemcomitans, Neisseria gonorrhoeae and Neisseria meningitidis. The S. pneumoniae TehB displayed 46–58% identity (52–68% similarity) to these proteins. The results in this study showed that the S. pneumoniae tehB alone not only conferred on E. coli high level resistance to tellurite, but also caused filamentous morphology in E. coli.

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