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Figure 3.
Figure 3: Recognition of loop E by finger 4. a, Structure of
loop E. The chains are coloured as in Fig. 2a. Hydrogen bonds
are shown in red, and base stacking in green. Stacking
interactions are assigned according to the degree of overlap and
have separation distances shorter than 3.8 Å. b, Interaction of
loop E with the N terminus of the helix of finger 4. Colours are
the same as in a, with peptide side chains in yellow. The
hydrogen-bond interactions between protein and RNA are listed in
Fig. 2c. The bulged base 75G is gripped by hydrogen bonds from
Asp 120 and His 119, and its ribose by a hydrogen bond from Lys
118.
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