Slx1 is a catalytic subunit of the SLX1-SLX4 structure-specific endonuclease that resolves DNA secondary structures generated during DNA repair and recombination. It has endonuclease activity towards branched DNA substrates, introducing single-strand cuts in duplex DNA close to junctions with ss-DNA [1-3]. This is the RING zinc finger domain.

1: Human SLX4 is a Holliday junction resolvase subunit that binds multiple DNA repair/recombination endonucleases. Fekairi S, Scaglione S, Chahwan C, Taylor ER, Tissier A, Coulon S, Dong MQ, Ruse C, Yates JR 3rd, Russell P, Fuchs RP, McGowan CH, Gaillard PH; Cell. 2009;138:78-89. PMID:19596236

2: Slx1-Slx4 is a second structure-specific endonuclease functionally redundant with Sgs1-Top3. Fricke WM, Brill SJ; Genes Dev. 2003;17:1768-1778. PMID:12832395

3: Requirement for three novel protein complexes in the absence of the Sgs1 DNA helicase in Saccharomyces cerevisiae. Mullen JR, Kaliraman V, Ibrahim SS, Brill SJ; Genetics. 2001;157:103-118. PMID:11139495