Nucleic Acids Research, Vol 26, Issue 8 1906-1926, Copyright © 1998 by Oxford University Press
RE Dickerson
DNA bending in 86 complexes with sequence-specific proteins has been
examined using normal vector plots, matrices of normal vector angles
between all base pairs in the helix, and one-digit roll/slide/twist tables.
FREEHELIX, a new program especially designed to analyze severely bent and
kinked duplexes, generates the foregoing quantities plus local roll, tilt,
twist, slide, shift and rise parameters that are completely free of any
assumptions about an overall helix axis. In nearly every case, bending
results from positive roll at pyrimidine- purine base pair steps: C-A (=
T-G), T-A, or less frequently C-G, in a direction that compresses the major
groove. Normal vector plots reveal three well-defined types of bending
among the 86 examples: (i) localized kinks produced by positive roll at one
or two discrete base pairs steps, (ii) three-dimensional writhe resulting
from positive roll at a series of adjacent base pairs steps, or (iii)
continuous curvature produced by alternations of positive and negative roll
every 5 bp, with side-to-side zig-zag roll at intermediate position. In no
case is tilt a significant component of the bending process. In sequences
with two localized kinks, such as CAP and IHF, the dihedral angle formed by
the three helix segments is a linear function of the number of base pair
steps between kinks: dihedral angle = 36 degrees x kink separation.
Twenty-eight of the 86 examples can be described as major bends, and
significant elements in the recognition of a given base sequence by
protein. But even the minor bends play a role in fine-tuning protein/DNA
interactions. Sequence-dependent helix deformability is an important
component of protein/DNA recognition, alongside the more generally
recognized patterns of hydrogen bonding. The combination of FREEHELIX,
normal vector plots, full vector angle matrices, and one- digit
roll/slide/twist tables affords a rapid and convenient method for assessing
bending in DNA.
ARTICLES
DNA bending: the prevalence of kinkiness and the virtues of normality
Laboratory of Molecular Biophysics, The Rex Richards Building, South Parks Road, Oxford OX1 3QU, UK. red@biop.ox.ac.uk
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