Enables GTP binding activity. Predicted to be involved in Ras protein signal transduction. Located in plasma membrane. Is expressed in Meckel's cartilage; bone; hip; and rib. Used to study Noonan syndrome 8. Human ortholog(s) of this gene implicated in Noonan syndrome 8. Orthologous to human RIT1 (Ras like without CAAX 1). [provided by Alliance of Genome Resources, Apr 2022]