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- W2023961607 abstract "The thermal triple helix-coil transition of the CNBr peptides of the α1-chain of calf-skin collagen was studied optically and calorimetrically. Besides α1CB5, all the peptides were able to form triple-helical structures at low temperatures. The peptides with longer chain lengths showed, under the experimental conditions, hysteresis in the transition range depending on the direction of the successive temperature changes. The detailed thermodynamic analysis of the optical transition curves was only possible for the two small peptides α1CB2 and α1CB4. We observed a higher stability of α1CB2 relative to α1CB4 (α1CB2 has higher imino acid content), accompanied with increased values of both denaturation enthalpy and entropy. Further, we observed a linear relationship between the calorimetrically determined denaturation enthalpy of all the CNBr peptides and their imino acid content. Although this behavior is qualitatively in accordance with the observation of Privalov and Tiktopulo on various kinds of native collagen, the CNBr peptides showed much lower values of the thermodynamic parameters ΔH0 and ΔS0 and differed also in the rate of their change with imino acid content. These differences are interpreted as being caused by misalignment in the helical form of the CNBr peptides resulting in a rupture of the specific interactions in the native form." @default.
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- W2023961607 date "1978-02-01" @default.
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- W2023961607 title "The triple helix-coil transition of cyanogen-bromide peptides of the ?1-chain of the calf-skin collagen" @default.
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- W2023961607 doi "https://doi.org/10.1002/bip.1978.360170215" @default.
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