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• W2015193833 abstract "Single-molecule studies of the conformations of the intact beta(2) adrenergic receptor were performed in solution. Photon bursts from the fluorescently tagged adrenergic receptor in a micelle were recorded. A photon-burst algorithm and a Poisson time filter were implemented to characterize single molecules diffusing across the probe volume of a confocal microscope. The effects of molecular diffusion and photon number fluctuations were deconvoluted by assuming that Poisson distributions characterize the molecular occupation and photon numbers. Photon-burst size histograms were constructed, from which the source intensity distributions were extracted. Different conformations of the beta(2) adrenergic receptor cause quenching of the bound fluorophore to different extents and hence produce different photon-burst sizes. An analysis of the photon-burst histograms shows that there are at least two distinct substates for the native adrenergic membrane receptor. This behavior is in contrast to one peak observed for the dye molecule, rhodamine 6G. We test the reliability and robustness of the substate number determination by investigating the application of different binning criteria. Conformational changes associated with agonist binding result in a marked change in the distribution of photon-burst sizes. These studies provide insight into the conformational heterogeneity of G protein-coupled receptors in the presence and absence of a bound agonist." @default.
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• W2015193833 date "2001-07-03" @default.
• W2015193833 modified "2023-10-18" @default.
• W2015193833 title "Single-molecule spectroscopy of the β ₂ adrenergic receptor: Observation of conformational substates in a membrane protein" @default.
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• W2015193833 doi "https://doi.org/10.1073/pnas.151239698" @default.
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