<prompt> Pyridoxine is involved inCarboxylationTrans-sulfurationOxidation-reductionTransketolation  <response>: Pyridoxine is involved in trans-sulfuration.Sulfur-Containing Amino Acids PLP plays an impoant role in methionine and cysteine metabolism. a.Homocysteine Serine - Cystathionine. Enzyme Cystathionine synthase b.Cystathionine - Homoserine Cysteine Enzyme Cystathionase Both these reactions require PLP. Here transfer of sulphur group occurs.Ref: DM Vasudevan - Textbook of Biochemistry, 6th edition, page no: 396 