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Effect of prevention of procollagen triple-helix formation on proline 3-hydroxylation in freshly isolated chick-embryo tendon cells.
Authors:K Majamaa
Abstract:Inhibition of procollagen triple-helix formation by the addition of cis-hydroxyproline or azetidine-2-carboxylic acid increased the synthesis of 3-hydroxy14C]proline 1.7-1.8-fold in pulse-chase experiments with freshly isolated chick-embryo tendon cells. The amount of 3-hydroxy14C]proline, expressed as a percentage of the total 14C radioactivity in hydroxyproline, reached 8.4%. Control experiments indicated that the two analogues had no effect on the prolyl 3-hydroxylase activity of these cells. The data suggest that the time available before triple-helix formation in part regulates the extent of the 3-hydroxylation of proline in the biosynthesis of collagen in intact cells.
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