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Proteins. 2009 Feb 1;74(2):368-77. doi: 10.1002/prot.22147.

Discovery of sarcosine dimethylglycine methyltransferase from Galdieria sulphuraria.

Author information

1
Center for Eukaryotic Structural Genomics and Department of Biochemistry, University of Wisconsin, Madison, WI 53706, USA.

Abstract

An enzyme with sarcosine dimethylglycine methyltransferase (SDMT) activity has been identified in the thermophilic eukaryote, Galdieria sulphuraria. The crystal structure of the enzyme, solved to a resolution of 1.95 A, revealed a fold highly similar to that of mycolic acid synthases. The kcat and apparent K(M) values were 64.3 min(-1) and 2.0 mM for sarcosine and 85.6 min(-1) and 2.8 mM for dimethylglycine, respectively. Apparent K(M) values of S-adenosylmethionine were 144 and 150 microM for sarcosine and dimethylglycine, respectively, and the enzyme melting temperature was 61.1 degrees C. Modeling of cofactor binding in the active site based on the structure of methoxy mycolic acid synthase 2 revealed a number of conserved interactions within the active site.

PMID:
18623062
PMCID:
PMC2742680
DOI:
10.1002/prot.22147
[Indexed for MEDLINE]
Free PMC Article

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