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Updated: Jun 11, 2025

Author Spotlight: Unveiling the Role of SNF2L in Replication Fork Stability and Genome Duplication
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BRCA2 C-terminal clamp restructures RAD51 dimers to bind B-DNA for replication fork stability.

Michael A Longo, Syed Moiz Ahmed, Yue Chen

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    The BRCA2 protein

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Structural Biology

    Background:

    • BRCA2 is a tumor suppressor crucial for DNA repair and cancer development.
    • It functions with RAD51 in replication-fork protection (FP) and homology-directed DNA repair (HDR).
    • The BRCA2 C-terminus was believed to stabilize RAD51 filaments on single-stranded DNA.

    Purpose of the Study:

    • To determine the crystal structure of the BRCA2 C-terminal interaction domain (TR2i) bound to RAD51 before DNA binding.
    • To elucidate the mechanism by which BRCA2 regulates RAD51 activity in DNA repair pathways.

    Main Methods:

    • X-ray crystallography to obtain high-resolution structures.
    • Biochemical assays to assess protein interactions and functions.
    • Molecular analysis using interface-guided mutations.

    Main Results:

    • The crystal structure revealed that TR2i reshapes ATP-RAD51 into a unique dimer conformation.
    • This conformation favors double-stranded B-DNA binding, which is unsuitable for HDR initiation.
    • TR2i acts as an allosteric clamp, utilizing proline-driven structures and specific residue interactions (e.g., BRCA2 S3291/P3292) to switch RAD51.
    • This switch enforces replication-fork protection (FP) during S-phase and HDR during G2, regulated by CDK phosphorylation.

    Conclusions:

    • BRCA2 TR2i allosterically regulates RAD51, switching its DNA binding preference from single-stranded to double-stranded DNA.
    • This mechanism ensures replication-fork protection during S-phase and allows homology-directed repair in G2.
    • The findings provide new insights into BRCA2's role in cancer etiology and therapy resistance.