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• W2093444295 abstract "Regulator of G-protein signaling 9-1 (RGS9-1) and RGS9-2 are highly related RGS proteins with distinctive C termini arising from alternative splicing of RGS9 gene transcripts. RGS9-1 is expressed in photoreceptors where it functions as a regulator of transducin. In contrast, RGS9-2 is abundantly expressed in the brain, especially in basal ganglia, where its specific function remains poorly understood. To gain insight into the function of RGS9-2, we screened a human cDNA library for potential interacting proteins. This screen identified a strong interaction between RGS9-2 and alpha-actinin-2, suggesting a possible functional relationship between these proteins. Consistent with this idea, RGS9-2 and alpha-actinin-2 coimmunoprecipitated after coexpression in human embryonic kidney 293 (HEK-293) cells. Furthermore, endogenous RGS9-2 and alpha-actinin-2 could also be coimmunoprecipitated from extracts of rat striatum, an area highly enriched in both these proteins. These results supported the idea that RGS9-2 and alpha-actinin-2 could act in concert in central neurons. Like alpha-actinin-2, RGS9-2 coimmunoprecipitated NMDA receptors from striatal extracts, suggesting an interaction between RGS9-2, alpha-actinin-2, and NMDA receptors. Previous studies have shown that alpha-actinin mediates calcium-dependent inactivation of NMDA receptors. In HEK-293 cells expressing NMDA receptors, expression of RGS9-2 significantly modulated this form of NMDA receptor inactivation. Furthermore, this modulation showed remarkable preference for NMDA receptor inactivation mediated by alpha-actinin-2. Using a series of deletion constructs, we localized this effect to the RGS domain of the protein. These results identify an unexpected functional interaction between RGS9-2 and alpha-actinin-2 and suggest a potential novel role for RGS9-2 in the regulation of NMDA receptor function." @default.
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• W2093444295 date "2006-03-01" @default.
• W2093444295 modified "2023-10-18" @default.
• W2093444295 title "Brain-Specific Regulator of G-Protein Signaling 9-2 Selectively Interacts with α-Actinin-2 to Regulate Calcium-Dependent Inactivation of NMDA Receptors" @default.
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• W2093444295 doi "https://doi.org/10.1523/jneurosci.4083-05.2006" @default.
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