The BRCT domain of DNA ligase 3 (LIG3) binds to the C-terminal BRCT domain of the scaffolding protein X-ray repair cross-complementing protein 1 (XRCC1) and mediates homo- and heterodimerisation [1].

1: The structural basis for partitioning of the XRCC1/DNA ligase III-alpha BRCT-mediated dimer complexes. Cuneo MJ, Gabel SA, Krahn JM, Ricker MA, London RE; Nucleic Acids Res. 2011;39:7816-7827. PMID:21652643