The tetraheme cytochrome CymA is required for anaerobic respiration with dimethyl sulfoxide and nitrite in Shewanella oneidensis

C Schwalb, Graeme A Reid, Stephen K Chapman

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    109 Citations (Scopus)

    Abstract

    The tetraheme c-type cytochrome, CymA, from Shewanella oneidensis MR-1 has previously been shown to be required for respiration with Fe(III), nitrate, and fumarate [Myers, C. R., and Myers, J. M. (1997) J. Bacteriol. 179, 1143-1152]. It is located in the cytoplasmic membrane where the bulk of the protein is exposed to the periplasm, enabling it to transfer electrons to a series of redox partners. We have expressed and purified a soluble derivative of CymA (CymA(sol)) that lacks the N-terminal membrane anchor. We show here, by direct measurements of electron transfer between the purified proteins, that CymA(sol) efficiently reduces S. oneidensis fumarate reductase. This indicates that no further proteins are required for electron transfer between the quinone pool and fumarate if we assume direct reduction of CymA by quinols. By expressing CymA(sol) in a mutant lacking CymA, we have shown that this soluble form of the protein can complement the defect in fumarate respiration. We also demonstrate that CymA is essential for growth with DMSO (dimethyl sulfoxide) and for reduction of nitrite, implicating CymA in at least five different electron transfer pathways in Shewanella.

    Original languageEnglish
    Pages (from-to)9491-9497
    Number of pages7
    JournalBiochemistry
    Volume42
    Issue number31
    DOIs
    Publication statusPublished - 12 Aug 2003

    Keywords

    • GENE
    • WOLINELLA-SUCCINOGENES
    • ESCHERICHIA-COLI
    • PUTREFACIENS MR-1
    • OPERON
    • SEQUENCE
    • OUTER-MEMBRANE
    • SOLUBLE FUMARATE REDUCTASE
    • FLAVOCYTOCHROME-C
    • FE(III)

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