gamma-aminobutyric acid metabolic process 4-aminobutyrate metabolism See also the biological process term 'neurotransmitter metabolic process ; GO:0042133'. GABA metabolic process biological_process The chemical reactions and pathways involving gamma-aminobutyric acid (GABA, 4-aminobutyrate), an amino acid which acts as a neurotransmitter in some organisms. 4-aminobutyrate metabolic process GO:0009448 gamma-aminobutyric acid metabolism 4-aminobutanoate metabolism 4-aminobutanoate metabolic process GABA metabolism monocarboxylic acid metabolic process non-proteinogenic amino acid metabolic process