Predicted to contribute to GTPase activator activity. Predicted to be involved in cellular response to amino acid starvation; negative regulation of TORC1 signaling; and positive regulation of autophagy. Predicted to be located in lysosomal membrane. Predicted to be part of GATOR1 complex. Human ortholog(s) of this gene implicated in developmental and epileptic encephalopathy and focal epilepsy. Is an ortholog of human DEPDC5 (DEP domain containing 5, GATOR1 subcomplex subunit).