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J. Biol. Chem., Vol. 275, Issue 23, 17808-17813, June 9, 2000

This Article Full Text Full Text (PDF) All Versions of this Article: 275/23/17808    most recent M909794199v1 Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Matton, N. Articles by Williams, K. Search for Related Content PubMed PubMed Citation Articles by Matton, N. Articles by Williams, K. Social Bookmarking                      What's this?

Identification of Mismatch Repair Protein Complexes in HeLa Nuclear Extracts and Their Interaction with Heteroduplex DNA^*

Nancy Matton, Josephine Simonetti, and Kandace Williams

From the Department of Biological Sciences/Biomedical Program, University of Alaska, Anchorage, Alaska 99508

Deficiencies in DNA mismatch repair (MMR) have been found in hereditary colon cancers (hereditary non-polyposis colon cancer, HNPCC) as well as in sporadic cancers, illustrating the importance of MMR in maintaining genomic integrity. We have examined the interactions of specific mismatch repair proteins in human nuclear extracts. Western blot and co-immunoprecipitation studies indicate two complexes as follows: one consisting of hMSH2, hMSH6, hMLH1, and hPMS2 and the other consisting of hMSH2, hMSH6, hMLH1, and hPMS1. These interactions occur without the addition of ATP. Furthermore, the protein complexes specifically bind to mismatched DNA and not to a similar homoduplex oligonucleotide. The protein complex-DNA interactions occur primarily through hMSH6, although hMSH2 can also become cross-linked to the mismatched substrate when not participating in the MMR protein complex. In the presence of ATP the binding of hMSH6 to mismatched DNA is decreased. In addition, hMLH1, hPMS2, and hPMS1 no longer interact with each other or with the hMutS complex (hMSH2 and hMSH6). However, the ability of hMLH1 to co-immunoprecipitate mismatched DNA increases in the presence of ATP. This interaction is dependent on the presence of the mismatch and does not appear to involve a direct binding of hMLH1 to the DNA.

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