Rab9 effector protein with Kelch motifs also known as p40 is a protein that in humans is encoded by the RABEPKgene.[1][2]
Membrane-associated p40, in together with RAB9A, facilitates the transport of the mannose 6-phosphate receptor (MPR) from endosomes to the trans-Golgi network.[1]
Ikonomov OC, Sbrissa D, Mlak K, et al. (2004). "Active PIKfyve associates with and promotes the membrane attachment of the late endosome-to-trans-Golgi network transport factor Rab9 effector p40". J. Biol. Chem. 278 (51): 50863–71. doi:10.1074/jbc.M307260200. PMID14530284.