Predicted to enable several functions, including ATPase binding activity; guanyl ribonucleotide binding activity; and ionotropic glutamate receptor binding activity. Acts upstream of or within protein transport; regulation of endocytosis; and small GTPase mediated signal transduction. Located in endosome. Is expressed in several structures, including cardiovascular system; central nervous system; genitourinary system; gut; and liver and biliary system. Orthologous to human RAB4A (RAB4A, member RAS oncogene family). [provided by Alliance of Genome Resources, Apr 2022]