Lateral diffusion of inositol 1,4,5-trisphosphate receptor type 1 is regulated by actin filaments and 4.1N in neuronal dendrites.

The Journal of Biological Chemistry
Kazumi FukatsuKatsuhiko Mikoshiba

Abstract

Inositol 1,4,5-trisphosphate receptor type1 (IP3R1) plays an important role in neuronal functions; however, the lateral diffusion of IP3R1 on the endoplasmic reticulum membrane and its regulation in the living neurons remain unknown. We expressed green fluorescent protein-tagged IP3R1 in cultured rat hippocampal neurons and observed the lateral diffusion by the fluorescence recovery after photobleaching technique. IP3R1 showed lateral diffusion with an effective diffusion constant of approximately 0.3 microm2/s. Depletion of actin filaments increased the diffusion constant of IP3R1, suggesting that the diffusion of IP3R1 is regulated negatively through actin filaments. We also found that protein 4.1N, which binds to IP3R1 and contains an actin-spectrin-binding region, was responsible for this actin regulation of the IP3R1 diffusion constant. Overexpression of dominant-negative 4.1N and blockade of 4.1N binding to IP3R1 increased the IP3R1 diffusion constant. The diffusion of IP3R type 3 (IP3R3), one of the isoforms of IP3Rs lacking the binding ability to 4.1N, was not dependent on actin filaments but became dependent on actin filaments after the addition of a 4.1N-binding sequence. These data suggest that 4.1N serves as a linke...Continue Reading

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