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Synaptic localization of SAPAP1, a synaptic membrane-associated protein.
Ikuko Yao1, Junko Iida, Wataru Nishimura
1Department of Medical Biochemistry, Graduate School of Medicine, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8519, Japan.
Genes to Cells : Devoted to Molecular & Cellular Mechanisms
|February 13, 2003
Summary
SAPAP1 protein targets synapses via its N-terminal region, independent of PSD-95. This synaptic scaffolding molecule is immobile, forming a static core within the postsynaptic density (PSD).
Area of Science:
- Neuroscience
- Molecular Biology
- Cell Biology
Background:
- SAPAP1 (Synaptic Scaffolding Molecule Associated Protein 1) interacts with PSD-95 and other synaptic proteins.
- These interactions occur through distinct regions of SAPAP1.
Purpose of the Study:
- To investigate the mechanisms of SAPAP1 synaptic targeting.
- To determine SAPAP1's role in the localization of other postsynaptic density (PSD) proteins.
Main Methods:
- Expression of SAPAP1 regions in hippocampal neurons.
- Analysis of synaptic targeting and protein interactions.
- Fluorescence recovery after photobleaching (FRAP) to assess mobility.
Main Results:
- SAPAP1 synaptic targeting is mediated by its N-terminal region, independent of PSD-95 or S-SCAM.
- SAPAP1 influences Shank localization but not PSD-95 or S-SCAM localization.
- SAPAP1 synaptic targeting is unaffected by NMDA or AMPA receptor blockade.
- FRAP studies show SAPAP1 is immobile at synapses.
Conclusions:
- SAPAP1 is a static component of the postsynaptic density (PSD) core.
- SAPAP1 exhibits distinct dynamics compared to other PSD proteins like PSD-95, S-SCAM, and BEGAIN.