has primary input transmembrane signaling receptor activity GABA receptor activity gamma-aminobutyric acid receptor activity See also the molecular function term 'neurotransmitter receptor activity ; GO:0030594'. Combining with gamma-aminobutyric acid (GABA), and transmitting the signal from one side of the membrane to the other to initiate a change in cell activity. (GABA, 4-aminobutyrate) is an amino acid which acts as a neurotransmitter in some organisms. GABA binding 4-aminobutanoate receptor activity gamma-aminobutyric acid binding 4-aminobutyrate receptor activity GO:0016917 molecular_function gamma-aminobutyrate binding signaling receptor activity