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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 4, Number 1
January 20, 1983 

Chain Dimensions and Intrinsic Viscosities of Polypeptides in the Helix-Coil Transition Region
Jong Ryul Kim, Taikyue Ree
An equation is derived which correlates the unperturbed dimensions < r2 >0 of polypeptides with the helical contents in the helix-coil transition region by using a simple model of a polypeptide chain. The model is a chain of connected balls which represent the repeating units, -CO-NH-CHR-, based on the fact that the repeating unit has a plane structure. The changing trend of the expansion factor αη in the transition region is connected with the helical content fH. The intrinsic viscosities [η] of polypeptides are calculated from the unperturbed dimensions and the αη factors. The above calculated results concerning < r2 >0 and [η] are compared with other authors' theoretical and experimental results. From the comparison, we concluded that our theory explains better the chain dimensional behavior of polypeptides in the helix-coil transition region than others.
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