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Figure 1.
Figure 1: Superhelical path and base-pair-step parameters for
NCP147 DNA. a, Structural alignment of the NCP147 (gold) and
best-fit, ideal superhelix (red) paths. The NCP147 DNA structure
is superimposed (gold). The left view is down the superhelix
axis and the right view is rotated 90° around the
pseudo-two-fold axis (vertical). b, Roll, tilt, shift, slide and
twist base-pair-step parameters. The base-pair-step values
plotted are the means for the two halves of the symmetrical
sequence (shown above, with the dyad position labelled '0'). The
iCAT and iSAT curves (red) show the roll and tilt contributions
to the ideal superhelix curvature. The minor-groove blocks show
base-pair-step shift alternation (pink in shift and tilt) or
kinks (orange in roll, slide and twist). The primary
bound-phosphate groups are indicated above the base sequence by
pointers (numbered as the 5' phosphate of the adjacent base)
showing the strand direction (dark, 3'  arrow
5'; light, 5' arrow
3') and the interacting histone motif (L1, loop 1; L2, loop 2;
A1,  1).
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