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• W2088880971 abstract "Genetic information is encoded by, but potentially not limited to, a four-letter alphabet. A variety of predominantly hydrophobic nucleobase analogues that form self-pairs in DNA have been examined as third base pair candidates. For example, the PICS self-pair is both stable in duplex DNA and synthesized by some wild-type polymerases with reasonable efficiency. These efforts to expand the genetic code are expected to be facilitated by optimizing both the unnatural nucleobase analogues and the polymerases that replicate them. Here, we report the use of an activity-based selection system to evolve a DNA polymerase that more efficiently replicates DNA containing the PICS self-pair. The selection system is based on the co-display on phage of DNA polymerase libraries and a DNA substrate containing the self-pair. Only polymerases that accept the unnatural substrate incorporate a biotin-dUTP to the attached primer and may then be isolated on a streptavidin solid support. A mutant of Sf polymerase, P2, was evolved which both inserts dPICSTP opposite dPICS in the template and extends the unnatural primer terminus by incorporation of the next correct natural dNTP, where the parental enzyme catalyzes neither step at detectable rates. P2 was found to be a triple mutant of Sf, with the mutations F598I, I614F, and Q489H. The evolved properties of P2, as well as the observed mutations, are consistent with an increased affinity for the DNA primer-template containing the self-pair." @default.
• W2088880971 created "2016-06-24" @default.
• W2088880971 creator A5025948470 @default.
• W2088880971 creator A5047874372 @default.
• W2088880971 creator A5060971950 @default.
• W2088880971 date "2005-08-18" @default.
• W2088880971 modified "2023-10-16" @default.
• W2088880971 title "Polymerase Evolution: Efforts toward Expansion of the Genetic Code" @default.
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• W2088880971 doi "https://doi.org/10.1021/ja053322h" @default.
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