ABSTRACT
In the process of protein biosynthesis the primary protein amino acids are incorporated one by one as per the instructions contained in the ‘‘gene’’ for the concerned protein. The process is referred to as translation as it entails the translation of the genetic code to the amino acid sequence. Once the protein is synthesized, some modifications, referred to as post-translational modifications, can occur in some amino acid residues
of the protein. Thus proteins may contain certain amino acids other than these 20 (coded) amino acids. These are called as secondary protein amino acids. If, however, the modification leads to crosslinking of two amino acids then these are referred to as tertiary protein amino acids.
