<prompt> The role of vitamin K in epoxide cycle isCarboxylation of glucatamateDehydrogenation of glucatamateCarboxylation of glutamateDehydrogenation of aspaate  <response>: Carboxylation of glutamate is the role of VitK in epoxide cycle. Vitamin K is necessary for coagulation. Factors dependent on vitamin K are Factor II prothrombin; Factor VII SPCA; Factor IX Christmas factor; Factor X Stua Prower factor All these factors are synthesized by the liver as inactive zymogens. They undergo post-translational modification; gamma-carboxylation of glutamic acid residues. These are the binding sites for calcium ions. The gamma-carboxy glutamic acid GCG synthesis requires vitamin K as a co-factor Ref: DM Vasudevan - Textbook of Biochemistry, 8th edition, page no: 462 image satyanarayana 4th ed page 131 