Enables GABA receptor binding activity. Involved in gamma-aminobutyric acid receptor clustering and regulation of inhibitory synapse assembly. Located in inhibitory synapse and postsynaptic membrane. Is expressed in brain; heart; intestine; lung; and reproductive system. Orthologous to human LHFPL4 (LHFPL tetraspan subfamily member 4). [provided by Alliance of Genome Resources, Apr 2022]