Involved in DNA double-strand break (DSB) repair and recombination. Promotes the annealing of complementary single-stranded DNA and by stimulation of the RAD51 recombinase (By similarity). Part of a complex that includes RAD51, RAD52 and RAD59. In response to MMS and UV treatment, and in response to heat shock and oxidative stress. Belongs to the RAD52 family.