<prompt> In transaminases, PLP is covalently attached to which amino acid?GlutamateLysineAlanineThreonine  <response>: Transaminases:- Transfer amino groups in reactions Coenzyme required is Vitamin B6 i.e. active form PLP Pyridoxal phosphate The PLP is linked with a e-amino group of a lysine residue, at the active site of the enzyme forming a Schiff base imine linkage ping pong bi bi mechanism is involved in transamination reaction. NOTE: Threonine does not undergo transamination. All the amino acids undergo transamination except: Proline Lysine Threonine Hydroxyproline 