This domain is found at the C-terminal of the SMC5-SMC6 complex localization factor 2 (SFL2, also known as NSE6 and FAM178A)) which bridges the interaction between SMC6 and SFL1 (NSE5), being responsible for targeting the SMC5/6 complex to double-strand DNA breaks (DSBs) repair sites [1]. It is suggested to be a regulatory element in SMC5/6 complex dynamics by locking its coiled-coiled arms together, thus being named as Coiled-coil And Nse INteracting (CANIN) domain [1]. This domain is essential for the interaction with NSE5. It forms a U-shaped structure that seems to be structurally conserved in eukaryotes [1,2].

1: Molecular Insights into the Architecture of the Human SMC5/6 Complex. Adamus M, Lelkes E, Potesil D, Ganji SR, Kolesar P, Zabrady K, Zdrahal Z, Palecek JJ; J Mol Biol. 2020;432:3820-3837. PMID:32389690

2: Salicylic acid activates DNA damage responses to potentiate plant immunity. Yan S, Wang W, Marques J, Mohan R, Saleh A, Durrant WE, Song J, Dong X; Mol Cell. 2013;52:602-610. PMID:24207055