description
Ubiquinone (UQ), also called coenzyme Q, and plastoquinone (PQ) are electron carriers in oxidative phosphorylation and photosynthesis, respectively. The quinoid nucleus of ubiquinone is derived from the shikimate pathway; 4-hydroxybenzoate is directly formed from chorismate in bacteria, while it can be formed from either chorismate or tyrosine in yeast. The following biosynthesis of terpenoid moiety involves reactions of prenylation, decarboxylation, and three hydroxylations alternating with three methylations. The order of these reactions are somewhat different between bacteria and yeast. Phylloquinone (vitamin K1), menaquinone (vitamin K2), and tocopherol (vitamin E) are fat-soluble vitamins. Phylloquinone is a compound present in all photosynthetic plants serving as a cofactor for photosystem I-mediated electron transport. Menaquinone is an obligatory component of the electron-transfer pathway in bacteria

external resources
NCBI:82939
KEGG:hsa00130
PUBMED:18284213
PUBMED:11470786
PUBMED:17760421
PUBMED:17956107
PUBMED:12615349
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PUBMED:12523993
PUBMED:12721307
PUBMED:21239697
PUBMED:12232327
PUBMED:12908086
PUBMED:11583838

genes
NQO1 , GGCX , HPD , TAT , COQ7 , COQ2 , COQ6 , COQ3 , VKORC1 , COQ5 , VKORC1L1 ,