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J Biol Chem, Vol. 273, Issue 18, 11158-11163, May 1, 1998

Differentiation of Glycine Antagonist Sites of N-Methyl-D-aspartate Receptor Subtypes
PREFERENTIAL INTERACTION OF CGP 61594 WITH NR1/2B RECEPTORS

Michael Honer, Dietmar Benke, Bodo Laube, Jochen Kuhse, Roland Heckendorn^§, Hans Allgeier^§, Christof Angst^§, Hannah Monyer^¶, Peter H. Seeburg^¶, Heinrich Betz, and Hanns Mohler

From the Institute of Pharmacology, Swiss Federal Institute of Technology (ETH) and University of Zurich, CH-8057 Zurich, Switzerland, the ^§ Nervous System Research, Novartis Pharma AG, CH-4002 Basel, Switzerland, the ^¶ Max-Planck-Institut for Medical Research, Department of Molecular Neuroscience, D-69120 Heidelberg, Germany, and the  Max-Planck-Institut für Hirnforschung, Abteilung Neurochemie, D-60528 Frankfurt, Germany

The binding site for the co-agonist glycine on N-methyl-D-aspartate (NMDA) receptors has been mapped to the NR1 subunit whereas binding of the principal agonist glutamate is mediated by the NR2 subunits. Using the novel glycine site antagonist and photoaffinity label CGP 61594, distinct contributions of the NR2 subunit variants to the glycine antagonist binding domains of NMDA receptor subtypes are demonstrated. High affinity sites for CGP 61594 were exclusively displayed by NR1/2B receptors, as shown by their co-distribution with the NR2B subunit, by subunit-selective immunoprecipitation and by functional analysis of NR1/2B receptors expressed in Xenopus oocytes (inhibitory potency, IC₅₀ = 45 ± 11 nM). Other NMDA receptor subtypes are clearly distinguished by reduced inhibitory potencies for CGP 61594, being low for NR1/2A and NR1/2D receptors (IC₅₀ = 430 ± 105 nM and 340 ± 61 nM, respectively) and intermediate for NR1/2C receptors (IC₅₀ = 164 ± 27 nM). Glycine antagonist sites with low and intermediate affinity for [³H]CGP 61594 were detected also in situ by radioligand binding in brain areas predominantly expressing the NR2A and NR2C subunits, respectively. Thus, [³H]CGP 61594 is the first antagonist radioligand that reliably distinguishes the glycine site of NMDA receptor subtypes. [³H]CGP 61594 is a promising tool to identify the NR2 subunit domains that contribute to differential glycine antagonist sites of NMDA receptor subtypes.

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