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Cortical Actin Contributes to Spatial Organization of ER-PM Junctions

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Journal Mol Biol Cell
Date 2017 Sep 29
PMID 28954864
Citations 28
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Abstract

Endoplasmic reticulum-plasma membrane (ER-PM) junctions mediate crucial activities ranging from Ca signaling to lipid metabolism. Spatial organization of ER-PM junctions may modulate the extent and location of these cellular activities. However, the morphology and distribution of ER-PM junctions are not well characterized. Using photoactivated localization microscopy, we reveal that the contact area of single ER-PM junctions is mainly oblong with the dimensions of ∼120 nm × ∼80 nm in HeLa cells. Using total internal reflection fluorescence microscopy and structure illumination microscopy, we show that cortical actin contributes to spatial distribution and stability of ER-PM junctions. Further functional assays suggest that intact F-actin architecture is required for phosphatidylinositol 4,5-bisphosphate homeostasis mediated by Nir2 at ER-PM junctions. Together, our study provides quantitative information on spatial organization of ER-PM junctions that is in part regulated by F-actin. We envision that functions of ER-PM junctions can be differentially regulated through dynamic actin remodeling during cellular processes.

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References
1.
Tinevez J, Perry N, Schindelin J, Hoopes G, Reynolds G, Laplantine E . TrackMate: An open and extensible platform for single-particle tracking. Methods. 2016; 115:80-90. DOI: 10.1016/j.ymeth.2016.09.016. View

2.
Nicovich P, Owen D, Gaus K . Turning single-molecule localization microscopy into a quantitative bioanalytical tool. Nat Protoc. 2017; 12(3):453-460. DOI: 10.1038/nprot.2016.166. View

3.
Wu Y, Whiteus C, Xu C, Hayworth K, Weinberg R, Hess H . Contacts between the endoplasmic reticulum and other membranes in neurons. Proc Natl Acad Sci U S A. 2017; 114(24):E4859-E4867. PMC: 5474793. DOI: 10.1073/pnas.1701078114. View

4.
Chang C, Hsieh T, Yang T, Rothberg K, Azizoglu D, Volk E . Feedback regulation of receptor-induced Ca2+ signaling mediated by E-Syt1 and Nir2 at endoplasmic reticulum-plasma membrane junctions. Cell Rep. 2013; 5(3):813-25. DOI: 10.1016/j.celrep.2013.09.038. View

5.
Xu K, Babcock H, Zhuang X . Dual-objective STORM reveals three-dimensional filament organization in the actin cytoskeleton. Nat Methods. 2012; 9(2):185-8. PMC: 3304438. DOI: 10.1038/nmeth.1841. View