| EC |
2.1.1.222 |
| Accepted name: |
2-polyprenyl-6-hydroxyphenol methylase |
| Reaction: |
S-adenosyl-L-methionine + 3-(all-trans-polyprenyl)benzene-1,2-diol = S-adenosyl-L-homocysteine + 2-methoxy-6-(all-trans-polyprenyl)phenol |
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For diagram of ubiquinol biosynthesis, click here |
| Other name(s): |
ubiG (gene name, ambiguous); ubiG methyltransferase (ambiguous); 2-octaprenyl-6-hydroxyphenol methylase |
| Systematic name: |
S-adenosyl-L-methionine:3-(all-trans-polyprenyl)benzene-1,2-diol 2-O-methyltransferase |
| Comments: |
UbiG catalyses both methylation steps in ubiquinone biosynthesis in Escherichia coli. The second methylation is classified as EC 2.1.1.64 (3-demethylubiquinol 3-O-methyltransferase) [2]. In eukaryotes Coq3 catalyses the two methylation steps in ubiquinone biosynthesis. However, while the second methylation is common to both enzymes, the first methylation by Coq3 occurs at a different position within the pathway, and thus involves a different substrate and is classified as EC 2.1.1.114 (polyprenyldihydroxybenzoate methyltransferase). The substrate of the eukaryotic enzyme (3,4-dihydroxy-5-all-trans-polyprenylbenzoate) differs by an additional carboxylate moiety. |
| Links to other databases: |
BRENDA, EXPASY, KEGG, MetaCyc, PDB |
| References: |
| 1. |
Poon, W.W., Barkovich, R.J., Hsu, A.Y., Frankel, A., Lee, P.T., Shepherd, J.N., Myles, D.C. and Clarke, C.F. Yeast and rat Coq3 and Escherichia coli UbiG polypeptides catalyze both O-methyltransferase steps in coenzyme Q biosynthesis. J. Biol. Chem. 274 (1999) 21665–21672. [DOI] [PMID: 10419476] |
| 2. |
Hsu, A.Y., Poon, W.W., Shepherd, J.A., Myles, D.C. and Clarke, C.F. Complementation of coq3 mutant yeast by mitochondrial targeting of the Escherichia coli UbiG polypeptide: evidence that UbiG catalyzes both O-methylation steps in ubiquinone biosynthesis. Biochemistry 35 (1996) 9797–9806. [DOI] [PMID: 8703953] |
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| [EC 2.1.1.222 created 2011, modified 2013] |
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