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SCF CI MO calculations on the base–base interactions in dinucleoside monophosphates

✍ Scribed by H. G. Gumbinger; P. M. Kaiser

Book ID: 104579921
Publisher: John Wiley and Sons
Year: 1980
Tongue: English
Weight: 388 KB
Volume: 18
Category: Article
ISSN: 0020-7608
DOI: 10.1002/qua.560180213

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✦ Synopsis

Abstract

In order to elucidate further details of RNA conformations we have studied base stacking in dinucleoside monophosphates (DNP's) using UV difference spectra and the hypochromic effect. SCF CI MO calculations according to PPP and MIM approximations were carried out for six pyrimidine‐containing DNP's in each of several stacking geometries. The calculated and plotted difference spectra were fitted to the experimental spectra. Different DNP's showed distinct geometries in the range of the helix angle of 35°. From our results we conclude that there is a microstructure in the helix. This would imply an additional content of information in this macromolecule, a higher precision in nucleic acid interactions, and make possible the prediction of the conformation of polynucleotides.

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