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. 1997 Mar;179(6):1974–1979. doi: 10.1128/jb.179.6.1974-1979.1997

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

T P Higgins 1, P De Marco 1, J C Murrell 1
PMCID: PMC178921  PMID: 9068643

Abstract

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.

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Selected References

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