Functional implication of neuronal calcium sensor-1 and phosphoinositol 4-kinase-beta interaction in regulated exocytosis of PC12 cells

The Journal of Biological Chemistry
Jean de BarryNicolas Vitale

Abstract

Several studies have shown that the neuronal calcium sensor (NCS-1) and phosphoinositol 4-kinase-beta (PI4K-beta) regulate the exocytotic process of nerve and neuroendocrine cells. The aim of our study was to investigate their possible interaction at rest and during stimulation in living cells and to decipher the role of this interaction in the secretory process. In PC12 cells, we observed a stimulation-induced recruitment of NCS-1 and PI4K-beta from the intracellular compartment toward the plasma membrane. This recruitment was highly correlated to the intracellular Ca(2+) rise induced by secretagogues. Using fluorescence resonance energy transfer between PI4K-beta-ECFP and NCS-1-EYFP, we show that both proteins are interacting in resting cells and that this interaction increases with stimulation. It appears that the membrane insertion of NCS-1 is necessary for the interaction with PI4K-beta, since a mutation that prevented the membrane insertion of NCS-1 abolished NCS-1-PI4K-beta interaction, as revealed by fluorescence resonance energy transfer analysis. Additionally, the overexpression of mutated NCS-1 prevents the stimulatory effect on secretion induced by PI4K-beta, suggesting that the interaction of the two proteins on a ...Continue Reading

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Citations

Nov 26, 2010·Cellular and Molecular Neurobiology·Jamie L WeissRobert D Burgoyne
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