| Product Name |
polyprenyldihydroxybenzoate methyltransferase |
| Example Structure |
 |
| Synonyms |
3,4-dihydroxy-5-hexaprenylbenzoate methyltransferase, AtCOQ3, COQ-3, COQ3, Coq3 O-methyltransferase, Coq3p, DHHB methyltransferase, DHHB-MTase, dihydroxyhexaprenylbenzoate methyltransferase, UbiG |
| EC Number |
2.1.1.114 |
| CAS Registry Number |
139569-30-5 |
| Comments |
This enzyme is involved in ubiquinone biosynthesis. Ubiquinones from different organisms have a different number of prenyl units (for example, ubiquinone-6 in Saccharomyces, ubiquinone-9 in rat and ubiquinone-10 in human), and thus the natural substrate for the enzymes from different organisms has a different number of prenyl units. However, the enzyme usually shows a low degree of specificity regarding the number of prenyl units. For example, the human COQ3 enzyme can restore biosynthesis of ubiquinone-6 in coq3 deletion mutants of yeast [3]. The enzymes from yeast and rat also catalyse the methylation of 3-demethylubiquinol-6 and 3-demethylubiquinol-9, respectively [2] (this activity is classified as EC 2.1.1.64, 3-demethylubiquinol 3-O-methyltransferase). |
| Cofactor |
|
| History |
|
| Reactions |
S-adenosyl-L-methionine + 3,4-dihydroxy-5-all-trans-polyprenylbenzoate = S-adenosyl-L-homocysteine + 3-methoxy-4-hydroxy-5-all-trans- polyprenylbenzoate. |
