The activity of highly purified lysyl hydroxylase towards lysyl residues within both the helical and the N-terminal non-helical telopeptide regions of chick type I collagen has been examined. The peptides alpha 1(I)-CB1 and alpha 2(I)-CB1, isolated from protocollagen following CNBr digestion and containing the N-terminal telopeptidyl lysyl residues, failed themselves to act as substrates. With protocollagen as substrate, analysis of products obtained following bacterial collagenase digestion of the reaction mixture showed that overall 37% hydroxylation of lysyl residues within the helical region of collagen had been obtained, which may be maximal. No hydroxylation, however, of the single lysyl residue in either alpha 1(I)-CB1 or alpha 2(I)-CB1, isolated following CNBr digestion of the reaction mixture, was observed, despite the known susceptibility of these residues to hydroxylation. These findings provide strong circumstantial evidence for the suggestion that a lysyl hydroxylase specific for the telopeptidyl residues and distinct from that active towards lysyl residues in the helical portion of the molecule may exist [Barnes, Constable, Morton & Royce (1974) Biochem. J. 139, 461-468].
Research Article|September 01 1985
Failure of highly purified lysyl hydroxylase to hydroxylate lysyl residues in the non-helical regions of collagen
Biochem J (1985) 230 (2): 475-480.
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P M Royce, M J Barnes; Failure of highly purified lysyl hydroxylase to hydroxylate lysyl residues in the non-helical regions of collagen. Biochem J 1 September 1985; 230 (2): 475–480. doi: https://doi.org/10.1042/bj2300475
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