[An enzyme that catalyzes the rearrangement of disulfide bonds within proteins during folding. It is a monomer identical to one of the subunits of PROCOLLAGEN-PROLINE DIOXYGENASE. (From Dorland, 28th ed) EC 5.3.4.1. ( MSH )] (UMLS (CSP) C0072354) =Amino Acid, Peptide, or Protein; Enzyme ; =isomerase;