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• W2068129713 abstract "The effects of base sequence, specifically different pyrimidines flanking a bulky DNA adduct, on translesional synthesis in vitro catalyzed by the Klenow fragment of Escherichia coli Pol I (exo(-)) was investigated. The bulky lesion was derived from the binding of a benzo[a]pyrene diol epoxide isomer [(+)-anti-BPDE] to N(2)-guanine (G*). Four different 43-base long oligonucleotide templates were constructed with G* at a site 19 bases from the 5'-end. All bases were identical, except for the pyrimidines, X or Y, flanking G* (sequence context 5'-.XGY., with X, Y = C and/or T). In all cases, the adduct G* slows primer extension beyond G* more than it slows the insertion of a dNTP opposite G* (A and G were predominantly inserted opposite G, with A > G). Depending on X or Y, full lesion bypass differed by factors of approximately 1.5-5 ( approximately 0.6-3.0% bypass efficiencies). A downstream T flanking G on the 5'-side instead of C favors full lesion bypass, while an upstream C flanking G* is more favorable than a T. Various deletion products resulting from misaligned template-primer intermediates are particularly dominant ( approximately 5.0-6.0% efficiencies) with an upstream flanking C, while a 3'-flanking T lowers the levels of deletion products ( approximately 0.5-2.5% efficiencies). The kinetics of (1) single dNTP insertion opposite G* and (2) extension of the primer beyond G* by a single dNTP, or in the presence of all four dNTPs, with different 3'-terminal primer bases (Z) opposite G* were investigated. Unusually efficient primer extension efficiencies beyond the adduct (approaching approximately 90%) was found with Z = T in the case of sequences with 3'-flanking upstream C rather than T. These effects are traced to misaligned slipped frameshift intermediates arising from the pairing of pairs of downstream template base sequences (up to 4-6 bases from G*) with the 3'-terminal primer base and its 5'-flanking base. The latter depend on the base Y and on the base preferentially inserted opposite the adduct. Thus, downstream template sequences as well as the bases flanking G* influence DNA translesion synthesis." @default.
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• W2068129713 date "2001-05-02" @default.
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• W2068129713 title "Base Sequence Dependence of in Vitro Translesional DNA Replication past a Bulky Lesion Catalyzed by the Exo^- Klenow Fragment of Pol I^†" @default.
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• W2068129713 doi "https://doi.org/10.1021/bi010005o" @default.
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