Enables GDP binding activity; GTP binding activity; and small GTPase binding activity. Involved in bone resorption. Located in alveolar lamellar body and late endosome. Is anchored component of synaptic vesicle membrane. Human ortholog(s) of this gene implicated in Charcot-Marie-Tooth disease type 2B. Orthologous to human RAB7A (RAB7A, member RAS oncogene family). [provided by Alliance of Genome Resources, Apr 2022]