Plasmid-based lacZalpha assay for DNA polymerase fidelity: application to archaeal family-B DNA polymerase

Jozwiakowski, Stanislaw and Connolly, BA (2009) Plasmid-based lacZalpha assay for DNA polymerase fidelity: application to archaeal family-B DNA polymerase. Nucleic Acids Research, 37 (15). e102. ISSN 0305-1048

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Abstract

The preparation of a gapped pUC18 derivative, containing the lacZalpha reporter gene in the single-stranded region, is described. Gapping is achieved by flanking the lacZalpha gene with sites for two related nicking endonucleases, enabling the excision of either the coding or non-coding strand. However, the excised strand remains annealed to the plasmid through non-covalent Watson-Crick base-pairing; its removal, therefore, requires a heat-cool cycle in the presence of an exactly complementary competitor DNA. The gapped plasmids can be used to assess DNA polymerase fidelity using in vitro replication, followed by transformation into Escherichia coli and scoring the blue/white colony ratio. Results found with plasmids are similar to the well established method based on gapped M13, in terms of background ( approximately 0.08% in both cases) and the mutation frequencies observed with a number of DNA polymerases, providing validation for this straightforward and technically uncomplicated approach. Several error prone variants of the archaeal family-B DNA polymerase from Pyrococcus furiosus have been investigated, illuminating the potential of the method.

Item Type: Article
Schools and Departments: School of Life Sciences > Sussex Centre for Genome Damage and Stability
Related URLs:
Depositing User: Stanislaw Jozwiakowski
Date Deposited: 06 Feb 2012 19:52
Last Modified: 13 Mar 2017 23:55
URI: http://sro.sussex.ac.uk/id/eprint/22695

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