Human PSF binds to RAD51 and modulates its homologous-pairing and strand-exchange activities

Yuichi Morozumi, Yoshimasa Takizawa, Motoki Takaku, Hitoshi Kurumizaka*

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    50 Citations (Scopus)


    RAD51, a eukaryotic recombinase, catalyzes homologous-pairing and strand-exchange reactions, which are essential steps in homologous recombination and recombinational repair of double strand breaks. On the other hand, human PSF was originally identified as a component of spliceosomes, and its multiple functions in RNA processing, transcription and DNA recombination were subsequently revealed. In the present study, we found that PSF directly interacted with RAD51. PSF significantly enhanced RAD51-mediated homologous pairing and strand exchange at low RAD51 concentrations; however, in contrast, it inhibited these RAD51-mediated recombination reactions at the optimal RAD51 concentration. Deletion analyses revealed that the N-terminal region of PSF possessed the RAD51- and DNA-binding activities, but the central region containing the RNA-recognition motifs bound neither RAD51 nor DNA. These results suggest that PSF may have dual functions in homologous recombination and RNA processing through its N-terminal and central regions, respectively.

    Original languageEnglish
    Pages (from-to)4296-4307
    Number of pages12
    JournalNucleic Acids Research
    Issue number13
    Publication statusPublished - 2009

    ASJC Scopus subject areas

    • Genetics


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