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Figure 10.
Figure 10. The hairpin turn of b-Pol and the
helix-hairpin-helix (HhH) motifs of b-Pol, AlkA and endonuclease
III. (a) An overlay of 25 superimposed structural conformers
(residues 61-66) illustrating the hydrogen bond between the
amide proton of V65 and the carbonyl oxygen atom of L62. The
distance between the amide proton and carbonyl oxygen atom
ranges from 2.64 to 2.68 Å. (b) A superimposition of the
HhH motifs of the refined N-terminal domain of DNA polymerase b
(residues 59-76), AlkA (residues 209-226) and endonuclease III
(residues 111-128). The labeled side-chains K60, K68 and K72 are
for DNA polymerase b and correspond to Q210, W218, and Y222 in
AlkA and E112, K120, and V124 in endonuclease III.
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