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- W1987997143 abstract "We report on our application of a new fluorescence-correlation spectroscopy technique, 2-focus FCS, for measuring the hydrodynamic radius of molecules with sub- Ångstrøm precision. The method is applied of monitoring conformational changes of proteins upon ion binding. In particular, we present measurements on Ca<sup>2+</sup>-binding of recoverin. Recoverin belongs to the superfamily of EF-hand Ca<sup>2+</sup>-binding proteins and operates as a Ca<sup>2+</sup>-sensor in vertebrate photoreceptor cells, where it regulates the activity of rhodopsin kinase GRK1 in a Ca<sup>2+</sup>-dependent manner. The protein undergoes conformational changes upon Ca<sup>2+</sup>-changes that are reflected as changes in their hydrodynamic radius. By using 2fFCS we were able to resolve hydrodynamic radius changes of ca. one Ångstrøm and used the Ca<sup>2+</sup> dependence of this radius for recording binding curves in solution. We compare our results with those obtained by other techniques." @default.
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- W1987997143 date "2007-02-08" @default.
- W1987997143 modified "2023-09-26" @default.
- W1987997143 title "Monitoring of small conformational changes by high-precision measurements of hydrodynamic radius with 2-focus fluorescence correlation spectroscopy (2fFCS)" @default.
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- W1987997143 doi "https://doi.org/10.1117/12.704930" @default.
- W1987997143 hasPublicationYear "2007" @default.
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