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- W4313546314 abstract "Increased efforts are being made for observing proteins in their native environments. Pulsed electron–electron double resonance spectroscopy (PELDOR, also known as DEER) is a powerful tool for this purpose. Conventionally, PELDOR employs an identical spin pair, which limits the output to a single distance for monomeric samples. Here, we show that the Gd3+–trityl–nitroxide (NO) three-spin system is a versatile tool to study heterooligomeric membrane protein complexes, even within their native membrane. This allowed for an independent determination of four different distances (Gd3+–trityl, Gd3+–NO, trityl–NO, and Gd3+–Gd3+) within the same sample. We demonstrate the feasibility of this approach by observing sequential ligand binding and the dynamics of complex formation in the cobalamin transport system involving four components (cobalamin, BtuB, TonB, and BtuF). Our results reveal that TonB binding alone is sufficient to release cobalamin from BtuB in the native asymmetric bilayers. This approach provides a potential tool for the structural and quantitative analysis of dynamic protein–protein interactions in oligomeric complexes, even within their native surroundings." @default.
- W4313546314 created "2023-01-06" @default.
- W4313546314 creator A5005062860 @default.
- W4313546314 creator A5068906179 @default.
- W4313546314 date "2023-01-04" @default.
- W4313546314 modified "2023-10-14" @default.
- W4313546314 title "Gd<sup>3+</sup>–Trityl–Nitroxide Triple Labeling and Distance Measurements in the Heterooligomeric Cobalamin Transport Complex in the Native Lipid Bilayers" @default.
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- W4313546314 doi "https://doi.org/10.1021/jacs.2c10080" @default.
- W4313546314 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36599418" @default.
- W4313546314 hasPublicationYear "2023" @default.
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