This is the C-terminal domain of DNA replication factor Cdt1. This domain binds the MCM complex [1].

1: Structure of the Cdt1 C-terminal domain: conservation of the winged helix fold in replication licensing factors. Khayrutdinov BI, Bae WJ, Yun YM, Lee JH, Tsuyama T, Kim JJ, Hwang E, Ryu KS, Cheong HK, Cheong C, Ko JS, Enomoto T, Karplus PA, Guntert P, Tada S, Jeon YH, Cho Y; Protein Sci. 2009;18:2252-2264. PMID:19722278