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- W2121630433 abstract "Measuring the binding curve and stoichiometry of protein complexes in living cells is a prerequisite for quantitative modeling of cellular processes. Dual-color fluorescence fluctuation spectroscopy provides a general framework for detecting protein interactions, but lacks suitable methods for quantifying protein heterointeractions in the cell. We address this challenge by introducing heterospecies partition (HSP) analysis for protein heterointeractions of the type D + nA<-->DA(n). HSP directly identifies the heterointeracting species from the sample mixture and determines the binding curve and stoichiometry of the protein complex. The HSP method is applied to provide the first direct characterization of the ligand-dependent binding of the retinoic X receptor to the coactivator transcription intermediate factor 2. A previous study based on protein fragments observed a higher binding stoichiometry than biologically expected. We address this difference in stoichiometry by measuring the binding curves of the full-length proteins in living cells. This study provides proof-of-principle experiments that illustrate the potential of HSP as a general and robust analysis tool for the quantitative characterization of protein heterointeractions by dual-color fluorescence fluctuation spectroscopy in living cells." @default.
- W2121630433 created "2016-06-24" @default.
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- W2121630433 date "2010-02-08" @default.
- W2121630433 modified "2023-10-18" @default.
- W2121630433 title "Heterospecies partition analysis reveals binding curve and stoichiometry of protein interactions in living cells" @default.
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- W2121630433 doi "https://doi.org/10.1073/pnas.0905670107" @default.
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