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Probing membrane protein insertion into lipid bilayers by solid-state NMR.

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Najbauer,  E.
Department of NMR Based Structural Biology, MPI for Biophysical Chemistry, Max Planck Society;

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Giller,  K.
Department of NMR Based Structural Biology, MPI for Biophysical Chemistry, Max Planck Society;

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Becker,  S.
Department of NMR Based Structural Biology, MPI for Biophysical Chemistry, Max Planck Society;

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Andreas,  L.
Research Group of Solid State NMR Spectroscopy-2, MPI for Biophysical Chemistry, Max Planck Society;

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Citation

Najbauer, E., Movellan, K. T., Schubeis, T., Schwarzer, T., Castiglione, K., Giller, K., et al. (2019). Probing membrane protein insertion into lipid bilayers by solid-state NMR. ChemPhysChem, 20(2), 302-310. doi:10.1002/cphc.201800793.


Cite as: http://hdl.handle.net/21.11116/0000-0002-84FD-C
Abstract
Determination of the environment surrounding a protein is often key to understanding function, and can also be used to infer structural properties of the protein itself. Using proton-detected solid-state NMR, we show that reduced spin diffusion within the protein under conditions of fast magic-angle spinning, high magnetic field, and sample deuteration allows the efficient measurement of site-specific exposure to mobile water and lipids. We demonstrate this site specificity on two membrane proteins, the human voltage dependent anion channel, and the alkane transporter AlkL from Pseudomonas putida. Transfer from lipids is observed selectively in the membrane spanning region, and an average lipid-protein transfer rate of 6 s¯¹ was determined for residues protected from exchange. Transfer within the protein, as tracked in the ¹⁵N-¹H 2D plane, was estimated from initial rates and found to be in a similar range of about 8 to 15 s-1 for several resolved residues, explaining the site specificity.