This domain is found at the N-terminal end of Rad26 from Myceliophthora thermophila (Swiss:G2QDY6), a functional subunit of the Rad3-Rad26 complex that is responsible for bringing the kinase to sites of DNA damage. This domain consists of two helices that are arranged perpendicular to each other with an extended loop region in between. This coiled-coil domain is well-conserved in Rad26 orthologues. It seems to play a role in the formation of dimers [1].

1: Insights into Rad3 kinase recruitment from the crystal structure of the DNA damage checkpoint protein Rad26. Andersen KR; J Biol Chem. 2017;292:8149-8157. PMID:28314775