Store-independent modulation of Ca(2+) entry through Orai by Septin 7.

Abstract:

:Orai channels are required for store-operated Ca(2+) entry (SOCE) in multiple cell types. Septins are a class of GTP-binding proteins that function as diffusion barriers in cells. Here we show that Septin 7 acts as a 'molecular brake' on activation of Orai channels in Drosophila neurons. Lowering Septin 7 levels results in dOrai-mediated Ca(2+) entry and higher cytosolic Ca(2+) in resting neurons. This Ca(2+) entry is independent of depletion of endoplasmic reticulum Ca(2+) stores and Ca(2+) release through the inositol-1,4,5-trisphosphate receptor. Importantly, store-independent Ca(2+) entry through Orai compensates for reduced SOCE in the Drosophila flight circuit. Moreover, overexpression of Septin 7 reduces both SOCE and flight duration, supporting its role as a negative regulator of Orai channel function in vivo. Septin 7 levels in neurons can, therefore, alter neural circuit function by modulating Orai function and Ca(2+) homeostasis.

journal_name

Nat Commun

journal_title

Nature communications

authors

Deb BK,Pathak T,Hasan G

doi

10.1038/ncomms11751

subject

Has Abstract

pub_date

2016-05-26 00:00:00

pages

11751

issn

2041-1723

pii

ncomms11751

journal_volume

7

pub_type

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