All of the following are transaminated EXCEPT:: (A) d- amino group of ornithine, (B) a- amino group of proline, (C) a- amino group of serine, (D) a- amino group of cysteine
Answer is B. Only a amino group takes pa in transamination. Except:- d -amino group (non-a) of ornithine takes pa in transamination, where enzyme is OAT (Ornithine Amino Transferase). Out of the 20 amino acids, 3 amino acids do not take pa in transamination. Proline Lysine Threonine