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

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 mechanosensitive 1 and dependent on the integrity of actin 2 , suggesting a functionally important interaction between N...

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Veröffentlicht in:Nature (London) 1997-01, Vol.385 (6615), p.439-442
Hauptverfasser: Wyszynski, Michael, Lin, Jerry, Rao, Anuradha, Nigh, Elizabeth, Beggs, Alan H, Craig, Ann Marie, Sheng, Morgan
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Sprache:eng
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Zusammenfassung: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 mechanosensitive 1 and dependent on the integrity of actin 2 , 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 Ca 2+ /calmodulin. Thus α-actinin may play a role in both the localization of NMDA receptors and their modulation by Ca 2+ .
ISSN:0028-0836
1476-4687
DOI:10.1038/385439a0