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Figure 7.
Fig. 7. Four mobile modules of the Pol II structure. (A)
Backbone traces of the core, jaw-lobe, clamp, and shelf modules
of the form 1 structure, shown in gray, blue, yellow, and pink,
respectively. (B) Changes in the position of the jaw-lobe,
clamp, and shelf modules between form 1 (colored) and form 2
structures (gray). The arrows indicate the direction of charges
from form 1 to form 2. The core modules in the two crystal forms
were superimposed and then omitted for clarity. (C) The view in
(B) rotated 90° about a vertical axis. The core and jaw-lobe
modules are omitted for clarity. In form 2, the clamp has swung
to the left, opening a wider gap between its edge and the wall
located further to the right (not shown).
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