This domain is found at the C-terminal end of Cohesin subunit SCC3 from Saccharomyces cerevisiae and similar proteins from yeasts. SCC3 is a component of cohesin complex, a complex required for the cohesion of sister chromatids after DNA replication. This domain is is composed of a continuously twisted tandem array of antiparallel alpha-helices resembling tandem HEAT repeats. It binds to two small sections within Scc1, the other component of the complex [1,2].

1: Structure and function of cohesin's Scc3/SA regulatory subunit. Roig MB, Lowe J, Chan KL, Beckouet F, Metson J, Nasmyth K; FEBS Lett. 2014;588:3692-3702. PMID:25171859

2: Structural basis for Scc3-dependent cohesin recruitment to chromatin. Li Y, Muir KW, Bowler MW, Metz J, Haering CH, Panne D; Elife. 2018; [Epub ahead of print] PMID:30109982