All of the following amino acids undergo transamination except?

All the amino acids undergo transamination except : Proline Lysine Threonine Hydroxyproline Transamination reaction interconves pairs of a-amino acids and a-keto acids. It is freely reversible and occurs a ping-pong mechanism. Pyridoxal phosphate (Vitamin B6) is the co-enzyme. It is impoant in the biosynthesis of non-essential amino acids. Reference: Harpers illustrated biochemistry 30th edition