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• W2056522916 abstract "Native collagen polypeptides exist in a unique triple helical conformation resistant to most proteinases. In this study, the stability of type I collagen triple helix, employing a mixture of trypsin and alpha-chymotrypsin as a proteolytic probe, was examined. The degradation of type I [3H]collagen was monitored as 3H-labeled peptides soluble in trichloroacetic acid (TCA) or by sodium dodecyl sulfate (SDS)-polyacrylamide slab gel electrophoresis. In one set of experiments, collagen substrates were preincubated at various temperatures for up to 8 h, followed by a 15-min proteolytic treatment at the same temperature. At 43 degrees C, most of the collagen was degraded, while the fraction of the substrate degraded at 40, 38, and 35 degrees C was 53, 41 and 19%, respectively. This fraction was independent of the preincubation time which varied from 10 to 480 min. Thus, at any given temperature, a constant fraction of the collagen substrate was susceptible to proteolysis. Measurement of the midpoint temperature (Tm) of the helix to coil transformation for type I collagen, at neutral pH employing an increasing temperature gradient and brief proteolysis at the individual temperatures, indicated a value of 38.8 degrees C. However, determination of the Tm by employing proteolytic digestions at a constant temperature (30 degrees C) using conditions under which the nonhelical peptides are readily digested to TCA-soluble peptides while native collagen resists such proteolysis, indicated a value of 42.7 degrees C. In further studies, collagen was subjected to continuous proteolysis for up to 24 h. A large fraction of collagen was digested at 30 or 34 degrees C, temperatures well below the Tm of the helix to coil transformation. SDS-polyacrylamide gel electrophoresis of the degradation products obtained at these temperatures revealed multiple cleavage fragments. Finally, temperature double-jump experiments indicated that the destabilization of the triple helix is reversible provided that the Tm of the substrate is not exceeded. The results provide evidence for reversible and local relaxation of the collagen triple helix." @default.
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• W2056522916 date "1983-06-01" @default.
• W2056522916 modified "2023-10-18" @default.
• W2056522916 title "Conformational stability of type I collagen triple helix: Evidence for temporary and local relaxation of the protein conformation using a proteolytic probe" @default.
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• W2056522916 doi "https://doi.org/10.1016/0003-9861(83)90621-5" @default.
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