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- W2007079193 abstract "2-Chloro-2'-deoxyadenine (2CldA) is used for treatment of several lymphoid malignancies. Since this drug is incorporated into DNA, we have undertaken studies on base pairing of 2-chloroadenine (2ClA). 2CldA phosphoramidite was synthesized and used for preparation of 25-mer templates with 2ClA located at site 21 from the 3'-end. Kinetic parameters (Km and Vmax) for the incorporation of deoxynucleoside-5'-triphosphates by AMV reverse transcriptase opposite the 2ClA template, as well as for the extension of 2ClA.T pair, were determined. The efficiency (Vmax/Km) of incorporation of dGTP, dCTP, and dATP opposite 2ClA is at least one order of magnitude lower than opposite unmodified A. The efficiency of incorporation of dTTP opposite 2ClA is about 30-fold lower than opposite A and extension of 2ClA.T pair is 3-fold lower than of A.T pair. From the analysis of the parameters of dTTP incorporation we conclude that formation of 2ClA.T pair is thermodynamically, but not kinetically controlled. The difference in binding energy (deltadeltaG) between 2ClA.T and A.T pairs in the environment of the polymerase active site is 2 kcal/mol. Our results indicate that the presence of 2ClA in DNA slows down replication, but does not lead to base-substitution mutations." @default.
- W2007079193 created "2016-06-24" @default.
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- W2007079193 date "1998-06-30" @default.
- W2007079193 modified "2023-10-14" @default.
- W2007079193 title "Template-directed base pairing of 2-chloro-2'-deoxyadenosine catalyzed by AMV reverse transcriptase." @default.
- W2007079193 cites W2417474553 @default.
- W2007079193 doi "https://doi.org/10.18388/abp.1998_4251" @default.
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