Enables GTPase activating protein binding activity. Acts upstream of or within several processes, including Ral protein signal transduction; lung alveolus development; and surfactant homeostasis. Predicted to be located in cytosol and endoplasmic reticulum. Orthologous to human NKIRAS1 (NFKB inhibitor interacting Ras like 1). [provided by Alliance of Genome Resources, Apr 2022]