Disulfide-linked head-to-head multimerization in the mechanism of ion channel clustering by PSD-95.

The PSD-95/SAP90 family of PDZ-containing proteins is directly involved in the clustering of specific ion channels at synapses. We report that channel clustering depends on a conserved N-terminal domain of PSD-95 that mediates multimerization and disulfide linkage of PSD-95 protomers. This N-terminal multimerization domain confers channel clustering activity on a ...
single PDZ domain. Thus, channel clustering depends on aggregation of PDZ domains achieved by head-to-head multimerization of PSD-95, rather than by concatenation of PDZ domains in PSD-95 monomers. This mechanism predicts that PSD-95 can organize heterogeneous membrane protein clusters via differential binding specificities of its three PDZ domains. PSD-95 and its relative chapsyn-110 exist as disulfide-linked complexes in rat brain, consistent with head-to-head multimerization of these proteins in vivo.
Mesh Terms:
Animals, COS Cells, Cross-Linking Reagents, Disulfides, Gene Deletion, Guanylate Kinase, Intracellular Signaling Peptides and Proteins, Ligands, Membrane Proteins, Molecular Sequence Data, Mutagenesis, Nerve Tissue Proteins, Nucleoside-Phosphate Kinase, Potassium Channels, Precipitin Tests, Protein Binding, Protein Structure, Tertiary, Rats, Sequence Homology, Amino Acid, Shaker Superfamily of Potassium Channels, Transfection, Tumor Suppressor Proteins
Neuron
Date: May. 01, 1997
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