Mechanistic studies on prolyl-4-hydroxylase: the vitamin c requiring uncoupled oxidation
作者:Min Wu、Hong-sik Moon、Asta Pirskanen、Johanna Myllyharju、Kari I. Kivirikko、Tadhg P. Begley
DOI:10.1016/s0960-894x(00)00224-9
日期:2000.7
A deuteriated substrate for the human type I prolyl-4-hydroxylase was synthesized and its V/K deuterium isotope effect was determined to be 3.4 +/- 0.2. This isotope effect was attributed to the uncoupled oxidation. A dehydroproline containing tetrapeptide was also found to stimulate the uncoupled oxidation. (C) 2000 Elsevier Science Ltd. All rights reserved.
Mechanistic Studies on Prolyl-4-Hydroxylase: Demonstration That the Ferryl Intermediate Does Not Exchange with Water
作者:Wu Min、Tadhg P. Begley、Johanna Myllyharju、Kari I. Kivirikko
DOI:10.1006/bioo.2000.1182
日期:2000.10
Prolyl-4-hydroxylase catalyzes the formation of 4-hydroxyproline in collagens. In contrast to deacetoxy/deacetylcephalosporin C synthase, p-hydroxyphenylpyruvate hydroxylase, lysyl hydroxylase and alpha-ketoisocaproate oxygenase, no incorporation of (18)O-labeled water into the hydroxylated product was found for the human type I prolyl-4-hydroxylase when N-Cbz-Gly-L-Phe-L-Pro-Gly-OEt was used as a