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CaMKIIβ is localized in dendritic spines as both drebrin-dependent and drebrin-independent pools.

Journal of neurochemistry | 2018

Drebrin is a major F-actin binding protein in dendritic spines that is critically involved in the regulation of dendritic spine morphogenesis, pathology, and plasticity. In this study, we aimed to identify a novel drebrin-binding protein involved in spine morphogenesis and synaptic plasticity. We confirmed the beta subunit of Ca2+ /calmodulin-dependent protein kinase II (CaMKIIβ) as a drebrin-binding protein using a yeast two-hybrid system, and investigated the drebrin-CaMKIIβ relationship in dendritic spines using rat hippocampal neurons. Drebrin knockdown resulted in diffuse localization of CaMKIIβ in dendrites during the resting state, suggesting that drebrin is involved in the accumulation of CaMKIIβ in dendritic spines. Fluorescence recovery after photobleaching analysis showed that drebrin knockdown increased the stable fraction of CaMKIIβ, indicating the presence of drebrin-independent, more stable CaMKIIβ. NMDA receptor activation also increased the stable fraction in parallel with drebrin exodus from dendritic spines. These findings suggest that CaMKIIβ can be classified into distinct pools: CaMKIIβ associated with drebrin, CaMKIIβ associated with post-synaptic density (PSD), and CaMKIIβ free from PSD and drebrin. CaMKIIβ appears to be anchored to a protein complex composed of drebrin-binding F-actin during the resting state. NMDA receptor activation releases CaMKIIβ from drebrin resulting in CaMKIIβ association with PSD.

Pubmed ID: 29675826 RIS Download

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