The assembly of the presynaptic filament of recombinases represents the most important step in homologous recombination. The formation of the filament requires assistance from mediator proteins. Swi5 and Sfr1 have been identified as mediators in fission yeast and these proteins form a complex that stimulates strand exchange. Here, the expression, purification and crystallization of Swi5 and its complex with an N-terminally truncated form of Sfr1 (ΔN180Sfr1) are presented. Analytical ultracentrifugation of the purified samples showed that Swi5 and the protein complex exist as tetramers and heterodimers in solution, respectively. Swi5 was crystallized in two forms belonging to space groups C2 and R3 and the crystals diffracted to 2.7 Å resolution. Swi5–ΔN180Sfr1 was crystallized in space group P21212 and the crystals diffracted to 2.3 Å resolution. The crystals of Swi5 and Swi5–ΔN180Sfr1 are likely to contain one tetramer and two heterodimers in the asymmetric unit, respectively.
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