Abstract:
:Membrane-associated guanylate kinase-interacting protein (MAGUIN)-1 was identified as a protein interacting with synaptic scaffolding molecule (S-SCAM) and postsynaptic density (PSD)-95/synapse-associated protein (SAP)90. MAGUIN-1 has a chimerical molecular structure composed of one sterile alpha motif, one PSD-95/Dlg-A/ZO-1 (PDZ), and one pleckstrin homology (PH) domain, and interacts with the PDZ domains of S-SCAM and PSD-95/SAP90 via its carboxyl-terminal PDZ-binding motif. MAGUIN-1 is considered as a mammalian homologue of Drosophila CNK, which is a Raf-interacting protein implicated in the regulation of eye development. Here we have tested whether MAGUIN-1 interacts directly with Raf-1. MAGUIN-1 and Raf-1 were coimmunoprecipitated from rat brain. MAGUIN-1 binds to the kinase domain of Raf-1, and Raf-1 binds to the middle region of MAGUIN-1 containing the PH domain. However, in contrast to the dominant active mutant of Ki-Ras, which interacts with Raf-1, recruits it to the plasma membrane from the cytosol, and activates it, MAGUIN-1 neither activates Raf-1 nor recruits it to the plasma membrane. MAGUIN-1 may link Raf-1 to components of synapses assembled by PSD-95/SAP90 and S-SCAM.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Yao I,Ohtsuka T,Kawabe H,Matsuura Y,Takai Y,Hata Ydoi
10.1006/bbrc.2000.2475subject
Has Abstractpub_date
2000-04-13 00:00:00pages
538-42issue
2eissn
0006-291Xissn
1090-2104pii
S0006-291X(00)92475-6journal_volume
270pub_type
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