Involvement of Rad51C in two distinct protein complexes of Rad51 paralogs in human cells

Nan Liu, David Schild, Michael P. Thelen, Larry H. Thompson

Research output: Contribution to journalArticle

103 Citations (Scopus)

Abstract

Genetic studies in rodent and chicken mutant cell lines have suggested that Rad51 paralogs (XRCC2, XRCC3, Rad51B/Rad51L1, Rad51C/Rad51L2 and Rad51D/Rad51L3) play important roles in homologous recombinational repair of DNA double-strand breaks and in maintaining chromosome stability. Previous studies using yeast two- and three-hybrid systems have shown interactions among these proteins, but it is not clear whether these interactions occur simultaneously or sequentially in vivo. By utilizing immunoprecipitation with extracts of human cells expressing epitope-tagged Rad51 paralogs, we demonstrate that XRCC2 and Rad51D, while stably interacting with each other, co-precipitate with Rad51C but not with XRCC3. In contrast, Rad51C is pulled down with XRCC3, whereas XRCC2 and Rad51D are not. In addition, Rad51B could be pulled down with Rad51C and Rad51D, but not with XRCC3. These results suggest that Rad51C is involved in two distinct in vivo complexes: Rad51B-Rad51C-Rad51D-XRCC2 and Rad51C-XRCC3. In addition, we demonstrate that Rad51 co-precipitates with XRCC3 but not with XRCC2 or Rad51D, suggesting that Rad51 can be present in an XRCC3-Rad51C-Rad51 complex. These complexes may act as functional units and serve accessory roles for Rad51 in the presynapsis stage of homologous recombinational repair.

Original languageEnglish (US)
Pages (from-to)1009-1015
Number of pages7
JournalNucleic Acids Research
Volume30
Issue number4
StatePublished - Feb 15 2002
Externally publishedYes

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Recombinational DNA Repair
Chromosomal Instability
Proteins
Cell Extracts
Immunoprecipitation
Epitopes
Chickens
Rodentia
Yeasts
Cell Line

ASJC Scopus subject areas

  • Genetics

Cite this

Liu, N., Schild, D., Thelen, M. P., & Thompson, L. H. (2002). Involvement of Rad51C in two distinct protein complexes of Rad51 paralogs in human cells. Nucleic Acids Research, 30(4), 1009-1015.

Involvement of Rad51C in two distinct protein complexes of Rad51 paralogs in human cells. / Liu, Nan; Schild, David; Thelen, Michael P.; Thompson, Larry H.

In: Nucleic Acids Research, Vol. 30, No. 4, 15.02.2002, p. 1009-1015.

Research output: Contribution to journalArticle

Liu, N, Schild, D, Thelen, MP & Thompson, LH 2002, 'Involvement of Rad51C in two distinct protein complexes of Rad51 paralogs in human cells', Nucleic Acids Research, vol. 30, no. 4, pp. 1009-1015.
Liu, Nan ; Schild, David ; Thelen, Michael P. ; Thompson, Larry H. / Involvement of Rad51C in two distinct protein complexes of Rad51 paralogs in human cells. In: Nucleic Acids Research. 2002 ; Vol. 30, No. 4. pp. 1009-1015.
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abstract = "Genetic studies in rodent and chicken mutant cell lines have suggested that Rad51 paralogs (XRCC2, XRCC3, Rad51B/Rad51L1, Rad51C/Rad51L2 and Rad51D/Rad51L3) play important roles in homologous recombinational repair of DNA double-strand breaks and in maintaining chromosome stability. Previous studies using yeast two- and three-hybrid systems have shown interactions among these proteins, but it is not clear whether these interactions occur simultaneously or sequentially in vivo. By utilizing immunoprecipitation with extracts of human cells expressing epitope-tagged Rad51 paralogs, we demonstrate that XRCC2 and Rad51D, while stably interacting with each other, co-precipitate with Rad51C but not with XRCC3. In contrast, Rad51C is pulled down with XRCC3, whereas XRCC2 and Rad51D are not. In addition, Rad51B could be pulled down with Rad51C and Rad51D, but not with XRCC3. These results suggest that Rad51C is involved in two distinct in vivo complexes: Rad51B-Rad51C-Rad51D-XRCC2 and Rad51C-XRCC3. In addition, we demonstrate that Rad51 co-precipitates with XRCC3 but not with XRCC2 or Rad51D, suggesting that Rad51 can be present in an XRCC3-Rad51C-Rad51 complex. These complexes may act as functional units and serve accessory roles for Rad51 in the presynapsis stage of homologous recombinational repair.",
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