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Modeling the binding sites for spermine and ifenprodil on the regulatory (R) domains of the N-methyl-D-aspartate receptor GluN1 and GluN2B subunits was carried out after measuring spermine stimulation and ifenprodil inhibition at receptors containing GluN1 and GluN2B R domain mutants. Models were constructed based on the published crystal structure of the GluN1 and GluN2B R domains, which form a heterodimer (Nature 475:249-253, 2011). The experimental results and modeling suggest that a binding site for spermine was formed by the residues near the cleft between the R1 and R2 lobes of the GluN1 R domain (GluN1R) together with residues on the surface of the R2 (C-terminal side) lobe of the GluN2B R domain (GluN2BR). The ifenprodil binding site included residues on the surface of the R1 lobe (N-terminal side) of GluN1R together with residues near the cleft between the R1 and R2 lobes of GluN2BR. It was confirmed using a Western blot analysis that GluN1R and GluN2BR formed a heterodimer. Models of spermine and ifenprodil binding to the heterodimer were constructed. The modeling suggests that an open space between the two R1 lobes of GluN1R and GluN2BR is promoted through spermine binding and that the R1 lobes of GluN1R and GluN2BR approach each other through ifenprodil binding--an effect opposite to that seen with the binding of spermine.

the journal of pharmacology and experimental therapeutics/the journal of pharmacology and experimental therapeutics

Structural Changes of Regulatory Domain Heterodimer of<i>N</i>-Methyl-d-aspartate Receptor Subunits GluN1 and GluN2B through the Binding of Spermine and Ifenprodil

Structural Changes of Regulatory Domain Heterodimer ofN-Methyl-d-aspartate Receptor Subunits GluN1 and GluN2B through the Binding of Spermine and Ifenprodil