This domain is found at the C-terminus of ABC transporters. It has a coiled coil structure with an atypical 3(10)-helix in the alpha-hairpin region. It is involved in DNA_binding [1].

1: The C-terminal domain of the Uup protein is a DNA-binding coiled coil motif. Carlier L, Haase AS, Burgos Zepeda MY, Dassa E, Lequin O; J Struct Biol. 2012;180:577-584. PMID:22995754