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Figure 4.
Figure 4: Recognition of loop A by finger 6. a, Structure of
loop A. Three colours are used to indicate the three-way
junction, blue and purple as in Figs 2 and 3, but with
nucleotides 64-68 in orange. b, Interaction of loop A with the N
terminus of the helix of finger 6. Peptide side chains are shown
in yellow. The ring of Trp 177 docks on the face of base 11A,
and the two flanking residues, Thr 176 and Thr 178, make
hydrogen bonds to base 10C. Trp 177 also makes a hydrogen bond
to the ribose of 13A.
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