Abstract:
:The human MSH2/6 complex is essential for mismatch recognition during the repair of replication errors. Although mismatch repair components have been implicated in DNA homologous recombination repair, the exact function of hMSH2/6 in this pathway is unclear. Here, we show that the recombinant hMSH2/6 protein complex stimulated the ability of the Bloom's syndrome gene product, BLM, to process Holliday junctions in vitro, an activity that could also be regulated by p53. Consistent with these observations, hMSH6 colocalized with BLM and phospho-ser15-p53 in hydroxyurea-induced RAD51 nuclear foci that may correspond to the sites of presumed stalled DNA replication forks and more likely the resultant DNA double-stranded breaks. In addition, we show that hMSH2 and hMSH6 coimmunoprecipitated with BLM, p53, and RAD51. Both the number of RAD51 foci and the amount of the BLM-p53-RAD51 complex are increased in hMSH2- or hMSH6-deficient cells. These data suggest that hMSH2/6 formed a complex with BLM-p53-RAD51 in response to the damaged DNA forks during double-stranded break repair.
journal_name
Oncogenejournal_title
Oncogeneauthors
Yang Q,Zhang R,Wang XW,Linke SP,Sengupta S,Hickson ID,Pedrazzi G,Perrera C,Stagljar I,Littman SJ,Modrich P,Harris CCdoi
10.1038/sj.onc.1207462subject
Has Abstractpub_date
2004-05-06 00:00:00pages
3749-56issue
21eissn
0950-9232issn
1476-5594pii
1207462journal_volume
23pub_type
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