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Two-detector number and brightness analysis reveals spatio-temporal oligomerization of proteins in living cells

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Title: Two-detector number and brightness analysis reveals spatio-temporal oligomerization of proteins in living cells
Authors: Fukushima, Ryosuke Browse this author
Yamamoto, Johtaro Browse this author →KAKEN DB
Ishikawa, Hideto Browse this author
Kinjo, Masataka Browse this author →KAKEN DB
Keywords: Number and brightness analysis
Protein oligomerization
Particle brightness
Fluorescence imaging
Glucocorticoid receptor
Issue Date: 1-May-2018
Publisher: Elsevier
Journal Title: Methods
Volume: 140
Start Page: 161
End Page: 171
Publisher DOI: 10.1016/j.ymeth.2018.03.007
Abstract: Number and brightness analysis (N&B) is a useful tool for the simultaneous visualization of protein oligomers and their localization, with single-molecule sensitivity. N&B determines particle brightness (fluorescence intensity per particle) and maps the spatial distribution of fluorescently labeled proteins by performing statistical analyses of the image series obtained using laser scanning microscopy. The brightness map reveals presence of the oligomers of the targeted protein and their distribution in living cells. However, even when corrections are applied, conventional N&B is affected by afterpulsing, shot noise, thermal noise, dead time, and overestimation of particle brightness when the concentration of the fluorescent particles changes during measurement. The drawbacks of conventional N&B can be circumvented by using two detectors, a novel approach that we henceforth call two-detector number and brightness analysis (TD-N&B), and introducing a linear regression of fluorescence intensity. This statistically eliminates the effect of noise from the detectors, and ensures that the correct particle brightness is obtained. Our method was theoretically assessed by numerical simulations and experimentally validated using a dilution series of purified enhanced green fluorescent protein (EGFP), EGFP tandem oligomers in cell lysate, and EGFP tandem oligomers in living cells. Furthermore, this method was used to characterize the complex process of ligand-induced glucocorticoid receptor dimerization and their translocation to the cell nucleus in live cells. Our method can be applied to other oligomer-forming proteins in cell signaling, or to aggregations of proteins such as those that cause neurodegenerative diseases. (C) 2018 Elsevier Inc. All rights reserved.
Rights: ©2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:生命科学院・先端生命科学研究院 (Graduate School of Life Science / Faculty of Advanced Life Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 金城 政孝

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