BicD proteins consist of three coiled-coiled domains and are involved in dynein-mediated minus end-directed transport from the Golgi apparatus to the endoplasmic reticulum (ER). For full functioning they bind with GSK-3beta Pfam:PF05350 to maintain the anchoring of microtubules to the centromere. It appears that amino-acid residues 437-617 of BicD and the kinase activity of GSK-3 are necessary for the formation of a complex between BicD and GSK-3beta in intact cells [1].

1: GSK-3beta-regulated interaction of BICD with dynein is involved in microtubule anchorage at centrosome. Fumoto K, Hoogenraad CC, Kikuchi A; EMBO J. 2006;25:5670-5682. PMID:17139249