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Purification and molecular characterization of the electron transfer protein of methanesulfonic acid monooxygenase

Higgins, Timothy, De Marco, Paolo and Murrell, J. Colin 1997. Purification and molecular characterization of the electron transfer protein of methanesulfonic acid monooxygenase. Journal of Bacteriology 179 (6) , pp. 1974-1979.

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A novel serine pathway methylotroph, strain M2, capable of utilizing methanesulfonic acid (MSA) as a sole source of carbon and energy was investigated. The initial step in the biodegradative pathway of MSA in strain M2 involved an inducible NADH-specific monooxygenase enzyme (MSAMO). Fractionation of MSAMO active cell extracts by ion-exchange chromatography led to the loss of MSAMO activity. Activity was restored by mixing three distinct protein fractions, designated A, B, and C. Further purification to homogeneity of component C indicated that the polypeptide was acidic, with a pI of 3.9, and contained an iron-sulfur center with spectral characteristics similar to those of other proteins containing Rieske [2Fe-2S] centers. The size of the protein subunit and the similarity of the N-terminal sequence to those of ferredoxin components of other oxygenase enzymes have suggested that component C is a specific electron transfer protein of the MSAMO which contains a Rieske [2Fe-2S] cluster. The gene encoding component C of MSAMO was cloned and sequenced, and the predicted protein sequence was compared with those of other Rieske [2Fe-2S]-center-containing ferredoxins. MSAMO appears to be a novel combination of oxygenase elements in which an enzyme related to aromatic-ring dioxygenases attacks a one-carbon (C1) compound via monooxygenation.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Subjects: Q Science > QR Microbiology
Publisher: American Society for Microbiology
ISSN: 0021-9193
Last Modified: 04 Jun 2017 07:53

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