TY - JOUR
T1 - Mechanism of activation and selectivity in a ligand-gated ion channel
T2 - Structural and functional studies of GluR2 and quisqualate
AU - Jin, Rongsheng
AU - Horning, Michelle
AU - Mayer, Mark L.
AU - Gouaux, Eric
PY - 2002/12/31
Y1 - 2002/12/31
N2 - Glutamate is the major excitatory neurotransmitter in the mammalian brain. The (S)-2-amino- 3-(3-hydroxy-5-methyl-4-isoxazole)propionic acid (AMPA)-subtype glutamate receptor, a ligand-gated ion channel, mediates most of the fast excitatory synaptic transmission in the mammalian central nervous system. Here we present electrophysiological, biochemical, and crystallographic data on the interactions between quisqualate and the GluR2 receptor ion channel and its corresponding ligand binding core. Quisqualate is a high-affinity, full agonist which like AMPA and glutamate elicits maximum peak current responses, and stabilizes the ligand binding core in a fully closed conformation, reinforcing the concept that full agonists produce similar conformational changes [Armstrong, N., and Gouaux, E. (2000) Neuron 28, 165-181]. Nevertheless, the mechanism of quisqualate binding is different from that of AMPA but similar to that of glutamate, illustrating that quisqualate is a faithful glutamate analogue. A detailed comparison of the three agonist complexes reveals distinct binding mechanisms, particularly in the region of a hydrophobic pocket that is proximal to the anionic γ-substituents, and demonstrates the importance of agonist - water - receptor interactions. The hydrophobic pocket, which is predicted to vary in chemical character between receptor subtypes, probably plays an important role in determining receptor subtype specificity.
AB - Glutamate is the major excitatory neurotransmitter in the mammalian brain. The (S)-2-amino- 3-(3-hydroxy-5-methyl-4-isoxazole)propionic acid (AMPA)-subtype glutamate receptor, a ligand-gated ion channel, mediates most of the fast excitatory synaptic transmission in the mammalian central nervous system. Here we present electrophysiological, biochemical, and crystallographic data on the interactions between quisqualate and the GluR2 receptor ion channel and its corresponding ligand binding core. Quisqualate is a high-affinity, full agonist which like AMPA and glutamate elicits maximum peak current responses, and stabilizes the ligand binding core in a fully closed conformation, reinforcing the concept that full agonists produce similar conformational changes [Armstrong, N., and Gouaux, E. (2000) Neuron 28, 165-181]. Nevertheless, the mechanism of quisqualate binding is different from that of AMPA but similar to that of glutamate, illustrating that quisqualate is a faithful glutamate analogue. A detailed comparison of the three agonist complexes reveals distinct binding mechanisms, particularly in the region of a hydrophobic pocket that is proximal to the anionic γ-substituents, and demonstrates the importance of agonist - water - receptor interactions. The hydrophobic pocket, which is predicted to vary in chemical character between receptor subtypes, probably plays an important role in determining receptor subtype specificity.
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U2 - 10.1021/bi020583k
DO - 10.1021/bi020583k
M3 - Article
C2 - 12501192
AN - SCOPUS:0037207136
SN - 0006-2960
VL - 41
SP - 15635
EP - 15643
JO - Biochemistry
JF - Biochemistry
IS - 52
ER -