Antioxidant vitamins, C,E, -carotene, inactivate oxygen free radicals.
Vitamin B12
Vitamin B12consists of corrin ring(cf. porphyrin ring). Vitamin B12is stored in liver together with transcobalamin I. Vitamin B12is a methyl transferase. Methylmalonyl-CoA to succinyl-CoA and 2) homocystein to methionine and methylfolate to tetrahydroxyfolate, a necessary conversion to methylenefolate which methylates dUMP to dTMP by thymidylate synthase
葉酸 folate はプテリジン pteridine、パラアミノ安息香酸 aminobenzoicacid、グルタミン酸 glutamate の結合した構造を持つビタミンＢの一種です。葉酸は還元されテトラヒドロ葉酸 tetrahydroxyfolate 補酵素として機能します。Folate reductase is inhibited by trimethoprim in bacteria, and methotrexate in eukaryote.