This domain is found at the C-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 the last three helices in the structure. Together with the flexible C-terminal kinase-docking motif it plays a role in the binding of Rad3 [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