title: Translation of procollagen messenger RNA in a cell free system derived from wheat germ: hydroxylation of prolyl residues in the product.
abstract: Ribonucleic acid extracted from chick embryo calvaria directs the synthesis of a collagenous product in a cell-free system. A portion of the prolyl residues incorporated into this protein can be hydroxylated in vitro by prolyl hydroxylase as demonstrated by the release of 3H-H20 from 3H-proline and by the direct demonstration of 3H-hydroxyproline in acid hydrolysates of the product. Thirty percent of potential sites become hydroxylated in the in vitro reaction using either cell-free product or an underhydroxylated collagen extracted from chick calvaria. Neither prolonged incubation nor increased levels of enzyme increased the extent of hydroxylation in either substrate.
mesh_terms: D002474:Cell-Free System; D003094:Collagen / Q000096:biosynthesis*; D006900:Hydroxylation; D006909:Hydroxyproline / Q000378:metabolism*; D011393:Procollagen-Proline Dioxygenase / Q000378:metabolism; D012333:RNA, Messenger / Q000378:metabolism*
chemical_list: D012333:RNA, Messenger; D003094:Collagen; D011393:Procollagen-Proline Dioxygenase; D006909:Hydroxyproline