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. Author manuscript; available in PMC: 2015 Aug 22.
Published in final edited form as: J Am Chem Soc. 2015 May 27;137(22):7011–7014. doi: 10.1021/jacs.5b02701

Figure 2.

Figure 2

Active site configuration in the ternary hPol η insertion-step complex with dCMPNPP opposite MeFapy-dG. (A) View into the DNA major groove, and (B) rotated by ∼90° around the horizontal axis and looking perpendicularly onto the nucleobase plane of the incoming dCMPNPP. Carbon atoms of MeFapy-dG and incoming dCMPNPP are colored in cyan and purple, respectively, and Mg2+ ions are pink spheres. Gln-38 forms a H-bond to O4′ of MeFapy-dG, but N3 in the minor groove is too far removed (3.9 Å) from the Gln-38 amide oxygen for H-bond formation.