Enables GTP binding activity and GTPase activity. Involved in axonogenesis. Located in Golgi cis cisterna and endoplasmic reticulum membrane. Human ortholog(s) of this gene implicated in hereditary sensory neuropathy type 1D and hereditary spastic paraplegia 3A. Orthologous to human ATL1 (atlastin GTPase 1). [provided by Alliance of Genome Resources, Apr 2022]