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- W2155459051 abstract "The vast majority of DNA polymerases use the complementary templating strand of DNA to guide each nucleotide incorporation. There are instances, however, in which polymerases can efficiently incorporate nucleotides in the absence of templating information. This process, known as translesion DNA synthesis, can alter the proper genetic code of an organism. To further elucidate the mechanism of template-independent DNA synthesis, we monitored the incorporation of various nucleotides at the “blunt-end” of duplex DNA by the high-fidelity bacteriophage T4 DNA polymerase. Although natural nucleotides are not incorporated at the blunt-end, a limited subset of non-natural indolyl analogues containing extensive π-electron surface areas are efficiently utilized by the T4 DNA polymerase. These analogues possess high binding affinities that are remarkably similar to those measured during incorporation opposite an abasic site. In contrast, the kpol values are significantly lower during blunt-end extension when compared to incorporation opposite an abasic site. These kinetic differences suggest that the single-stranded region of the DNA template plays an important role during polymerization through stacking interactions with downstream bases, interactions with key amino acid residues, or both. In addition, we demonstrate that terminal deoxynucleotide transferase, a template-independent enzyme, can efficiently incorporate many of these non-natural nucleotides. However, that this unique polymerase cannot extend large, bulky non-natural nucleotides suggests that elongation is limited by steric constraints imposed by structural features present within the polymerase. Regardless, the kinetic data obtained from using either DNA polymerase indicate that template-independent synthesis can occur without the contributions of hydrogen-bonding interactions and suggest that π-electron interactions play an important role in polymerization efficiency when templating information is not present." @default.
- W2155459051 created "2016-06-24" @default.
- W2155459051 creator A5058712621 @default.
- W2155459051 creator A5077285970 @default.
- W2155459051 date "2007-08-13" @default.
- W2155459051 modified "2023-09-23" @default.
- W2155459051 title "The Use of Non-natural Nucleotides to Probe Template-Independent DNA Synthesis" @default.
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- W2155459051 doi "https://doi.org/10.1002/cbic.200700096" @default.
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