| Literature DB >> 3016719 |
V Mizrahi, P Benkovic, S J Benkovic.
Abstract
Mechanistic features of several processes involved in the idling-turnover reaction catalyzed by the large (Klenow) fragment of Escherichia coli DNA polymerase I have been established. The exonuclease----polymerase activity switch involved in the excision/incorporation mode of idling-turnover occurs without an intervening dissociation of the enzyme from its DNA substrate. Comparative studies on the pyrophosphorolysis kinetics of related DNA substrates indicate a significant dependence of the reaction rate upon the DNA sequence within the duplex region upstream of the primer-template junction. Finally, a gel electrophoretic analysis of the products of the idling-turnover reaction has provided direct evidence for an alternative DNA sequence-dependent misincorporation/excision pathway.Entities:
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Year: 1986 PMID: 3016719 PMCID: PMC386376 DOI: 10.1073/pnas.83.16.5769
Source DB: PubMed Journal: Proc Natl Acad Sci U S A ISSN: 0027-8424 Impact factor: 11.205