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A critical review of the nucleosidic vibration modes appearing in the 800–500‐cm −1 spectral region, based on new harmonic dynamics calculations
Author(s) -
Ghomi M.,
Letellier R.,
Taillandier E.
Publication year - 1988
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.360270405
Subject(s) - chemistry , raman spectroscopy , spectral line , vibration , normal mode , guanine , molecular physics , molecular vibration , atomic physics , computational chemistry , nuclear magnetic resonance , physics , optics , quantum mechanics , nucleotide , biochemistry , gene
On the basis of a harmonic dynamics calculation, it is shown that in the 800–500‐cm −1 spectral region of DNA vibrational spectra, the characteristic Raman peaks and ir bands do not arise from the same nucleosidic motions. The Raman spectra involve mainly the ring‐breathing modes of nucleic bases while the ir spectra reveal essentially their out‐of‐plane vibrations. Moreover, the calculated results show the splitting of the guanine‐ and adenine‐residue breathing modes upon their coupling with the sugar‐pucker motions. This fact is in agreement with the poly[d(G‐C)] and poly[d(A‐T)] Raman spectra.