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Localized vibrational modes at a double‐helix‐single‐strand junction
Author(s) -
Putnam B. F.,
Prohofsky E. W.
Publication year - 1983
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.360220711
Subject(s) - chemistry , helix (gastropod) , triple helix , double bond , single strand , hydrogen bond , molecular physics , crystallography , stereochemistry , dna , polymer chemistry , molecule , ecology , biochemistry , organic chemistry , snail , biology
Abstract A vibrational analysis has been performed for a double‐helix–single‐strand junction. A Green's function technique has been used in treating the junction as a defect on an otherwise perfect system of infinite chain homopolymers. We calculate that the hydrogen‐bond stretching at the junction is amplified by a factor of two relative to the interior of the double helix, B poly(dG)–poly(dC). Breathing modes localized near the junction have also been predicted at 77 and 94 wave numbers. The calculated results are shown to be consistent with predictions from recent nmr studies.