<prompt> Vitamin used for post translational modification of glutamic acid to gamma carboxy glutamate isADEK  <response>: Ref Robbins 9e 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. 