Synamon, a novel neuronal protein interacting with synapse-associated protein 90/postsynaptic density-95-associated protein.
Guanylate kinase-associated protein (GKAP)/SAP90/PSD-95- associated protein (SAPAP)/DLG- associated protein ( DAP) is a protein of the postsynaptic density (PSD), and binds to the guanylate kinase domain of PSD-95/synapse-associated protein (SAP) 90 and synaptic scaffolding molecule. GKAP/SAPAP/ DAP recruits PSD-95/SAP90 and its interacting protein, brain-enriched guanylate kinase-interacting protein, into the Triton X-100-insoluble fraction in transfected cells, suggesting that GKAP/SAPAP/ DAP may link several PSD components to the Triton X-100-insoluble structures in the PSD. We have identified here a novel neuronal GKAP/SAPAP/ DAP- binding protein and named it synamon. Synamon has seven ankyrin repeats at the NH(2) terminus followed by one src homology 3 domain and one PSD-95/Dlg-A/ZO-1 domain, and several proline-rich regions at the carboxyl terminus. Synamon interacts with the COOH-terminal region of GKAP/SAPAP/ DAP via the middle region containing a PSD-95/Dlg-A/ZO-1 domain. Synamon was coimmunoprecipitated with SAPAP from rat crude synaptosomes and colocalized with SAPAP in primary cultured rat hippocampal neurons. Because synamon is composed of various protein-interacting modules, it may also interact with proteins other than GKAP/SAPAP/ DAP to organize the architecture of the PSD.[1]References
- Synamon, a novel neuronal protein interacting with synapse-associated protein 90/postsynaptic density-95-associated protein. Yao, I., Hata, Y., Hirao, K., Deguchi, M., Ide, N., Takeuchi, M., Takai, Y. J. Biol. Chem. (1999) [Pubmed]
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