Which of the following vitamin acts as a cofactor for metabolism of sulphur containing amino acids?
Methyl group in N5-methyl tetrahydrofolic acid (N5- methyl THFA) is used for synthesis of active methionine, which takes pa in transmethylation reactions. Such transmethylation reactions are required for synthesis of choline, epinephrine, creatine etc. Sulphur containing amino acids include cysteine and methionine. Ref: Textbook of Biochemistry by DM Vasudevan, 5th edition, Page 303.
Folic acid
Biotin
Vit K
Pyridoxine