Excitatory amino acid transporter 4

Definition:

Sodium-dependent, high-affinity amino acid transporter that mediates the uptake of L-glutamate and also L-aspartate and D-aspartate. Functions as a symporter that transports one amino acid molecule together with two or three Na(+) ions and one proton, in parallel with the counter-transport of one K(+) ion. Mediates Cl(-) flux that is not coupled to amino acid transport; this avoids the accumulation of negative charges due to aspartate and Na(+) symport. Plays a redundant role in the rapid removal of released glutamate from the synaptic cleft, which is essential for terminating the postsynaptic action of glutamate (Probable).

References:

[1]. W A Fairman, et al. An excitatory amino-acid transporter with properties of a ligand-gated chloride channel. Nature. 1995 Jun 15;375(6532):599-603. [Content Brief]

[2]. Abeer Abousaab, et al. Caveolin-1 Sensitivity of Excitatory Amino Acid Transporters EAAT1, EAAT2, EAAT3, and EAAT4. J Membr Biol. 2016 Jun;249(3):239-49. [Content Brief]

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