This family is a C-terminal region of mitotic kinesin-like proteins that is necessary for the interaction with the small GTPase Arf6. MKLP1 is a Flemming body-localising protein essential for cytokinesis, so its interaction with Arf6 shows how Arf6 is involved in cytokinesis. The Arf6-MKLP1 complex plays a crucial role in cytokinesis by connecting the microtubule bundle and membranes at the cleavage plane [1].

1: Structural basis for Arf6-MKLP1 complex formation on the Flemming body responsible for cytokinesis. Makyio H, Ohgi M, Takei T, Takahashi S, Takatsu H, Katoh Y, Hanai A, Ueda T, Kanaho Y, Xie Y, Shin HW, Kamikubo H, Kataoka M, Kawasaki M, Kato R, Wakatsuki S, Nakayama K; EMBO J. 2012;31:2590-2603. PMID:22522702