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Figure 4.
Figure 4. Comparison of Dpo4[Abasic.dCTP] and
Polι[Abasic.dTTP] Ternary Complexes
The protein surface is
displayed in light blue (Dpo4) or cyan (Polι), DNA is shown in
stick representation, and putative Mg^2+ (Polι) or Ca^2+ (Dpo4)
ions are shown as dark blue spheres. The abasic site and the
incoming dTTP (Polι) or dCTP (Dpo4) are colored in red. The
nucleotide 5′ to the abasic site in the Dpo4 complex is
colored in sky blue. The abasic site is extrahelical in the Dpo4
complex (Ling et al., 2004), but remains intrahelical in the
Polι complex(es).
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