31. Amino acids are made into proteins by being joined together in a chain of peptide bonds . 32. In the duodenum, trypsin catalyzes the hydrolysis of peptide bonds , breaking down proteins into smaller peptides. 33. However thermolysin is also widely used for peptide bond formation through the reverse reaction of hydrolysis. 34. Strong mineral acids can readily hydrolyse the peptide bonds in a protein ( acid hydrolysis ). 35. PPIases catalyze the cis-trans isomerization of proline imidic peptide bonds in oligopeptides and accelerate protein folding. 36. A protein is a polymer that is composed from amino acids that are linked by peptide bonds . 37. Finally, in the extein the ester or thioester bond is rearranged to form a normal peptide bond . 38. The conversion of plasminogen to plasmin involves the cleavage of the peptide bond between Arg-561 and Val-562. 39. The process that cleaves the protein's peptide bonds , proteolysis, is sensitive to changes in pH and temperature. 40. The main difference arises in the location of the carbonyl oxygen atom of the scissile peptide bond .
