Predicted to enable small GTPase binding activity. Involved in aging and cell death. Predicted to be located in endoplasmic reticulum membrane and endoplasmic reticulum-Golgi intermediate compartment membrane. Predicted to be integral component of membrane. Predicted to be part of plasma membrane proton-transporting V-type ATPase complex. Human ortholog(s) of this gene implicated in immunodeficiency 47. Orthologous to human ATP6AP1 (ATPase H+ transporting accessory protein 1). [provided by Alliance of Genome Resources, Apr 2022]