Predicted to enable GTP binding activity. Involved in several processes, including mononuclear cell differentiation; positive regulation of lymphocyte mediated immunity; and regulation of T cell activation. Located in mitochondrion. Used to study lymphopenia and type 1 diabetes mellitus. Human ortholog(s) of this gene implicated in portal hypertension. Orthologous to several human genes including GIMAP5 (GTPase, IMAP family member 5). [provided by Alliance of Genome Resources, Apr 2022]