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Competitive binding of α-actinin and calmodulin to the NMDA receptor

Abstract

The mechanisms by which neurotransmitter receptors are immobilized at postsynaptic sites in neurons are largely unknown. The activity of NMDA (N-methyl-D-aspartate) receptors is mechanosensitive1 and dependent on the integrity of actin2, suggesting a functionally important interaction between NMDA receptors and the postsynaptic cytoskeleton. α-Actinin-2, a member of the spectrin/dystrophin family of actin-binding proteins, is identified here as a brain postsynaptic density protein that colocalizes in dendritic spines with NMDA receptors and the putative NMDA receptor-clustering molecule PSD-95. α-Actinin-2 binds by its central rod domain to the cytoplasmic tail of both NR1 and NR2B subunits of the NMDA receptor, and can be immunoprecipitated with NMDA receptors and PSD-95 from rat brain. Intriguingly, NR1-α-actinin binding is directly antagonized by Ca2+/calmodulin. Thus α-actinin may play a role in both the localization of NMDA receptors and their modulation by Ca2+.

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Wyszynski, M., Lin, J., Rao, A. et al. Competitive binding of α-actinin and calmodulin to the NMDA receptor. Nature 385, 439–442 (1997). https://doi.org/10.1038/385439a0

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