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Figure 2.
Fig. 2. Crystal structures of BP-1 and BP-2. Dpo4 is
represented by a purple molecular surface, the DNA and the
incoming dATP are shown as blue sticks, and the PAH is
highlighted in yellow. The divalent cations (Ca^2+) are shown as
green spheres. The unpaired dAMP at the 3' end of the template
strand was added by the terminal deoxynucleotide transferase
(TdT) activity of Dpo4 that is common to archael D in B-like
polymerases (34) (Fig. 4, which is published as supporting
information on the PNAS web site). Figs. 2 and 3 were generated
by using RIBBONS and GRASP (35, 36).
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