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Dynamic control of Rad51 recombinase by self-association and interaction with BRCA2.

Molecular cell | Oct 28, 2003

Here, we visualize GFP-Rad51 fusion proteins in the nucleus of living cells to demonstrate the dynamic compartmentalization of Rad51 by self-association or by binding to BRCA2. Mutants of Rad51 that fail to oligomerize and/or to bind BRCA2 distinguish three fractions of Rad51 within the nucleoplasm: a relatively mobile fraction, an immobile oligomerized fraction, and an immobile BRCA2-bound fraction. Strikingly, inhibition of replication by hydroxyurea reduces the immobile fraction of nucleoplasmic Rad51. This effect is specific to Rad51 mutants that retain the capacity to bind BRCA2, indicating that the BRCA2-bound fraction is selectively mobilized. We propose that arrested replication triggers a switch between dual functions of BRCA2 in sequestering or mobilizing a small fraction of nucleoplasmic Rad51 and suggest a mechanism for the dynamic control of protein complexes that participate in homologous recombination.

Pubmed ID: 14580352 RIS Download

Mesh terms: Animals | Avian Proteins | BRCA2 Protein | Binding Sites | Cell Compartmentation | Cell Division | Cell Line | Cell Nucleus | DNA Replication | DNA-Binding Proteins | Hydroxyurea | Macromolecular Substances | Mutation | Protein Binding | Protein Subunits | Rad51 Recombinase | Recombinant Fusion Proteins | Recombination, Genetic

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