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Nucleic Acids Research, 2003, Vol. 31, No. 7 1913-1920
© 2003 Oxford University Press

Repair of hydrolytic DNA deamination damage in thermophilic bacteria: cloning and characterization of a Vsr endonuclease homolog from Bacillus stearothermophilus

Martin Laging, Eric Lindner, Hans-Joachim Fritz and Wilfried Kramer

Abteilung Molekulare Genetik und Präparative Molekularbiologie, Institut für Mikrobiologie und Genetik, Georg-August-Universität Göttingen, Grisebachstrasse 8, D-37077 Göttingen, Germany

Eric Linder, Lehrstuhl für Chemie der Biopolymere, Technische Universität München-Weihenstephan, Abteilung für Biowissenschaftliche Grundlagen, Weihenstephaner Berg 3, D-85354 Freising, Germany

Hydrolytic deamination of 5-methyl cytosine in double stranded DNA results in formation of a T/G mismatch that—if left unrepaired—leads to a C->T transition mutation in half of the progeny. In addition to several mismatch-specific glycosylases that have been found in both pro- and eukaryotes to channel this lesion into base excision repair by removing the T from the mismatch, Vsr endonuclease from Escherichia coli has been described which initiates repair by an endonucleolytic strand incision 5' to the mismatched T. We have isolated a gene coding for a homolog of E.coli Vsr endonuclease from the thermophilic bacterium Bacillus stearothermophilus H3 (Vsr.Bst) using a method that allows PCR amplification with degenerated primers of gene segments which code for only one highly conserved amino acid region. Vsr.Bst was produced heterologously in E.coli and purified to apparent homogeneity. Vsr.Bst specifically incises heteroduplex DNA with a preference for T/G mismatches. The selectivity of Vsr.Bst for the sequence context of the T/G mismatch appears less pronounced than for Vsr.Eco.


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