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Dielectric dispersion of the α‐helix at the transition region to random coil
Author(s) -
Wada Akiyoshi,
Tanaka Toyoichi,
Kihara Hiroshi
Publication year - 1972
Publication title -
biopolymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.556
H-Index - 125
eISSN - 1097-0282
pISSN - 0006-3525
DOI - 10.1002/bip.1972.360110305
Subject(s) - helix (gastropod) , chemistry , dielectric , random coil , polarizability , electromagnetic coil , relaxation (psychology) , condensed matter physics , dispersion (optics) , solvent , chemical physics , transition (genetics) , molecule , crystallography , nuclear magnetic resonance , optics , physics , organic chemistry , circular dichroism , quantum mechanics , ecology , social psychology , psychology , biochemistry , snail , gene , biology
Dielectric studies have been carried out for the helix–coil transition of poly‐β‐benzyl‐ L ‐aspartate with m ‐cresol as a solvent. The transition of the solute molecules has been sharply reflected as a characteristic change in the dielectric dispersion curves in changing temperature. Two polarizations, one having a low and the other a high critical frequency, have appeared. According to theoretical considerations of a model of a broken helix, the former is found to come from the orientation. of helical sequences and the latter from the chemical relaxation due to the helix–coil transition. It also seems likely that the unfolded chain may have a polarizability which could not be neglected at the high‐temperature side of the transition.