succinate metabolic process glutamate metabolic process GABA shunt https://github.com/geneontology/go-ontology/issues/28355 https://github.com/geneontology/go-ontology/issues/28802 https://github.com/geneontology/go-ontology/issues/30202 https://github.com/geneontology/go-ontology/issues/31732 MetaCyc:GLUDEG-I-PWY The chemical reactions and pathways resulting in the formation of succinate from L-glutamate via gamma-aminobutyrate (GABA), bypassing two steps of the TCA cycle. It operates through the sequential conversion of glutamate to GABA by glutamate decarboxylase, transamination of GABA to succinic semialdehyde by GABA transaminase, and oxidation of succinic semialdehyde to succinate by succinate semialdehyde dehydrogenase. biological_process gamma-aminobutyrate shunt MetaCyc:PWY-8346 4-aminobutyrate shunt gamma aminobutyrate shunt GO:0006540 glutamate decarboxylation to succinate L-amino acid metabolic process proteinogenic amino acid metabolic process