Nucleic Acids Research, Vol 26, Issue 18 4274-4279, Copyright © 1998 by Oxford University Press
M Dlakic and RE Harrington
A novel, multiple DNA phasing analysis is described in which three sequence
motifs associated with bent DNA are clustered together in oligomers of
identical base composition, but with different phasing relationships of
these motifs to each other. Synthetic oligonucleotides containing different
combinations of AAAAA(A), GGGCCC and GAGAG sequence motifs were ligated and
analyzed by gel mobility and cyclization experiments to determine their
global curvature. These assays were used to obtain relative bending
contributions of the analyzed sequence motifs. The experimental results
also provide a rigorous test of predictive models for DNA bending. We
report, using molecular modeling, that none of the most widely used
dinucleotide (nearest neighbor) models can accurately describe the
conformational properties of these DNA sequences and that more complex
models, at least at the trinucleotide level, are required.
ARTICLES
Unconventional helical phasing of repetitive DNA motifs reveals their relative bending contributions
Department of Biochemistry 330, University of Nevada at Reno, Reno, NV 89557-0014, USA. mensur@umich.edu
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