Glutamate/gamma-aminobutyrate antiporter

UniProtKB accession: P63235

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Polymer Entities matching query 2

Go to UniProtKB: P63235

UniProtKB description: Involved in glutaminase-dependent acid resistance (PubMed:30498489, PubMed:8682809). Exchanges extracellular glutamate (Glu) for intracellular gamma-aminobutyric acid (GABA) under acidic conditions (PubMed:22407317, PubMed:23589309). The protonation states of substrates are crucial for transport. Selectively transports Glu with no net charge and GABA with a positive charge (PubMed:23589309). Also efficiently transports glutamine and, to a smaller extent, methionine and leucine (PubMed:22407317). When the extracellular pH drops below 2.5, can import L-glutamine and export either glutamate or GABA (PubMed:30498489). The ability to survive the extremely acidic conditions of the stomach is essential for successful colonization of the host by commensal and pathogenic bacteria (PubMed:30498489, PubMed:8682809).

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