Journal of Physical Chemistry B
Journal of Physical Chemistry B
5 years ago

Proton-Detected NMR Spectroscopy of Nanodisc-Embedded Membrane Proteins: MAS Solid-State vs Solution-State Methods

Proton-Detected NMR Spectroscopy of Nanodisc-Embedded Membrane Proteins: MAS Solid-State vs Solution-State Methods
Roland Riek, Anja Böckmann, Lukas Frey, Stefan Bibow, Beat H. Meier, Nils-Alexander Lakomek
The structural and dynamical characterization of membrane proteins in a lipid bilayer at physiological pH and temperature and free of crystal constraints is crucial for the elucidation of a structure/dynamics–activity relationship. Toward this aim, we explore here the properties of the outer-membrane protein OmpX embedded in lipid bilayer nanodiscs using proton-detected magic angle spinning (MAS) solid-state NMR at 60 and 110 kHz. [1H,15N]-correlation spectra overlay well with the corresponding solution-state NMR spectra. Line widths as well as line intensities in solid and solution both depend critically on the sample temperature and, in particular, on the crossing of the lipid phase transition temperature. MAS (110 kHz) experiments yield well-resolved NMR spectra also for fully protonated OmpX and both below and above the lipid phase transition temperature.

Publisher URL: http://dx.doi.org/10.1021/acs.jpcb.7b06944

DOI: 10.1021/acs.jpcb.7b06944

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