<prompt> True about Isopeptide bond:It makes protein resistantBond is formed bw carboxyl terminus of one protein and the amino group of a lysine residue on anotherInvolves in post-transcriptional modification of protein and Enzyme acts as catalyst for the bond formation bothAll  <response>: All i.e. It makes protein resistant, Bond is formed bw carboxyl terminus of one protein and the amino group of a lysine residue on another, Involves in post-transcriptional modification of protein, Enzyme acts as catalyst for the bond formation 