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2.1.1.222: 2-polyprenyl-6-hydroxyphenol methylase

This is an abbreviated version!
For detailed information about 2-polyprenyl-6-hydroxyphenol methylase, go to the full flat file.

Reaction

S-adenosyl-L-methionine
+
3-(all-trans-polyprenyl)benzene-1,2-diol
=
S-adenosyl-L-homocysteine
+
2-methoxy-6-(all-trans-polyprenyl)phenol

Synonyms

2-polyprenyl-6-hydroxyphenyl methylase, 3-demethyl ubiquinone-9 3-methyltransferase, UbiG, UbiG methyltransferase, ubiquinone biosynthesis O-methyltransferase

ECTree

     2 Transferases
         2.1 Transferring one-carbon groups
             2.1.1 Methyltransferases
                2.1.1.222 2-polyprenyl-6-hydroxyphenol methylase

Systematic Name

Systematic Name on EC 2.1.1.222 - 2-polyprenyl-6-hydroxyphenol methylase

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SYSTEMATIC NAME
IUBMB Comments
S-adenosyl-L-methionine:3-(all-trans-polyprenyl)benzene-1,2-diol 2-O-methyltransferase
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.