Vitamin used for post translational modification of glutamic acid to gamma carboxy glutamate is: (A) A, (B) D, (C) E, (D) K
Answer is D. Ref Robbins 9/e p442 ,119. The vitamin K-dependent carboxylase carries out the posttranslational modification of specific glutamate residues in proteins togamma-carboxy glutamic acid (Gla) in the presence of reduced vitamin K, molecular oxygen, and carbon dioxide.