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  • Title: Rapid redistribution of the postsynaptic density protein PSD-Zip45 (Homer 1c) and its differential regulation by NMDA receptors and calcium channels.
    Author: Okabe S, Urushido T, Konno D, Okado H, Sobue K.
    Journal: J Neurosci; 2001 Dec 15; 21(24):9561-71. PubMed ID: 11739567.
    Abstract:
    PSD-Zip45 (Homer 1c) and PSD-95 are postsynaptic density (PSD) proteins containing distinct protein-interacting motifs. Green fluorescent protein (GFP)-tagged PSD-Zip45 and PSD-95 molecules were targeted to the PSD in hippocampal neurons. We analyzed dynamic behavior of these GFP-tagged PSD proteins by using time-lapse confocal microscopy. In contrast to the less dynamic properties of PSD-95, PSD-Zip45 showed rapid redistribution and a higher steady-state turnover rate. Differential stimulation protocols were found to alter the direction of PSD-Zip45 assembly-disassembly. Transient increases in intracellular Ca(2+) by voltage-dependent Ca(2+) channel activation induced PSD-Zip45 clustering. In contrast, NMDA receptor-dependent Ca(2+) influx resulted in the disassembly of PSD-Zip45 clusters. Thus, neuronal activity differentially redistributes a specific subset of PSD proteins, which are important for localization of both surface receptors and intracellular signaling complexes.
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