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Molecular and Cellular Biology, September 1998, p. 5332-5342, Vol. 18, No. 9
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Specific Mismatch Recognition in Heteroduplex Intermediates by p53 Suggests a Role in Fidelity Control of Homologous Recombination

Christine Dudenhöffer, Gabor Rohaly, Katrin Will, Wolfgang Deppert, and Lisa Wiesmüller*

Heinrich-Pette-Institut für Experimentelle Virologie und Immunologie an der Universität Hamburg, D-20251 Hamburg, Germany

Received 2 February 1998/Returned for modification 30 March 1998/Accepted 23 June 1998

We demonstrate that wild-type p53 inhibits homologous recombination. To analyze DNA substrate specificities in this process, we designed recombination experiments such that coinfection of simian virus 40 mutant pairs generated heteroduplexes with distinctly unpaired regions. DNA exchanges producing single C-T and A-G mismatches were inhibited four- to sixfold more effectively than DNA exchanges producing G-T and A-C single-base mispairings or unpaired regions of three base pairs comprising G-T/A-C mismatches. p53 bound specifically to three-stranded DNA substrates, mimicking early recombination intermediates. The KD values for the interactions of p53 with three-stranded substrates displaying differently paired and unpaired regions reflected the mismatch base specificities observed in recombination assays in a qualitative and quantitative manner. On the basis of these results, we would like to advance the hypothesis that p53, like classical mismatch repair factors, checks the fidelity of homologous recombination processes by specific mismatch recognition.

* Corresponding author. Mailing address: Heinrich-Pette-Institut, Martinistrasse 52, 20251 Hamburg, Germany. Phone: 49-40-48051-234. Fax: 49-40-48051-117. E-mail: wiesmuel{at}plexus.uke.uni-hamburg.de.

Molecular and Cellular Biology, September 1998, p. 5332-5342, Vol. 18, No. 9
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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