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• W2068961732 endingPage "1715" @default.
• W2068961732 startingPage "1710" @default.
• W2068961732 abstract "The neurotoxicity of glutamate in the central nervous system is restricted by several (Na + + K + )-coupled transporters for this neurotransmitter. The astroglial transporter GLT-1 is the only subtype that exhibits high sensitivity to the nontransportable glutamate analogue dihydrokainate. A marked reduction in sensitivity to the blocker is observed when serine residues 440 and 443 are mutated to glycine and glutamine, which, respectively, occupy these positions in the other homologous glutamate transporters. They are located in the ascending limb of the recently identified pore-loop-like structure. Strikingly, mutation of serine-440 to glycine enables not only sodium but also lithium ions to drive net influx of acidic amino acids. Moreover, the efficiency of lithium as a driving ion for glutamate transport depends on the nature of the amino acid residue present at position 443. Mutant transporters containing single cysteines at the position of either serine residue become sensitive to positively as well as negatively charged methanethiosulfonate derivatives. In S440C transporters significant protection against this inhibition is provided both by transportable and nontransportable glutamate analogues, but not by sodium alone. Our observations indicate that the pore-loop-like structure plays a pivotal role in coupling ion and glutamate fluxes and suggest that it is close to the glutamate-binding site." @default.
• W2068961732 created "2016-06-24" @default.
• W2068961732 creator A5038910133 @default.
• W2068961732 creator A5065754575 @default.
• W2068961732 date "1999-02-16" @default.
• W2068961732 modified "2023-10-09" @default.
• W2068961732 title "Two serine residues of the glutamate transporter GLT-1 are crucial for coupling the fluxes of sodium and the neurotransmitter" @default.
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• W2068961732 doi "https://doi.org/10.1073/pnas.96.4.1710" @default.
• W2068961732 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/15569" @default.
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