Measuring Membrane Protein Dimerization Equilibrium in Lipid Bilayers by Single-Molecule Fluorescence Microscopy.
Measuring Membrane Protein Dimerization Equilibrium in Lipid Bilayers by Single-Molecule Fluorescence Microscopy.
复制标题
通过单分子荧光显微镜测量脂质双层中的膜蛋白二聚化平衡。
DOI:
10.1016/bs.mie.2016.08.025
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发表时间:
2016
影响因子:
--
通讯作者:
Robertson JL
中科院分区:
文献类型:
--
作者:
Chadda R;Robertson JL
Dimerization reactions in membranes underlie membrane protein folding, conformational stability and cell receptor signaling. Here we summarize a method that allows for measurement of equilibrium dimerization reactions of membrane proteins in lipid bilayers, using subunit capture into liposomes followed by single-molecule photobleaching analysis. This strategy is grounded in the fact that given a comparable labeling efficiency, monomeric or dimeric forms of a membrane protein will give rise to distinctly different photobleaching probability distributions. These methods have been used to measure the dimer stoichiometry of the Fluc F− ion channel, and the dimerization equilibrium constant of the ClC-ec1 Cl−/H+ antiporter in lipid bilayers. This approach can be applied to any membrane protein system provided it can be purified, fluorescently labeled in a quantitative manner, and verified to be correctly folded by functional assays, even if the structure is not yet known.
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