procollagen-l-proline , 2-oxoglutarate : oxygen oxidoreductase ( 4-hydroxylating ) , ec 1.14.11.2 ] , an alpha 2 beta 2 tetramer , catalyzes the formation of 4-hydroxyproline in collagens by the hydroxylation of proline residues in peptide linkages .
C0033235
procollagen
C0009325
collagens