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Default Lipid bilayer preparations of membrane proteins for oriented and magic-angle spinning solid-state NMR samples.

Lipid bilayer preparations of membrane proteins for oriented and magic-angle spinning solid-state NMR samples.

Related Articles Lipid bilayer preparations of membrane proteins for oriented and magic-angle spinning solid-state NMR samples.

Nat Protoc. 2013 Nov;8(11):2256-70

Authors: Das N, Murray DT, Cross TA


Abstract
Solid-state NMR spectroscopy has been used successfully for characterizing the structure and dynamics of membrane proteins as well as their interactions with other proteins in lipid bilayers. Such an environment is often necessary for achieving native-like structures. Sample preparation is the key to this success. Here we present a detailed description of a robust protocol that results in high-quality membrane protein samples for both magic-angle spinning and oriented-sample solid-state NMR. The procedure is demonstrated using two proteins: CrgA (two transmembrane helices) and Rv1861 (three transmembrane helices), both from Mycobacterium tuberculosis. The success of this procedure relies on two points. First, for samples for both types of NMR experiment, the reconstitution of the protein from a detergent environment to an environment in which it is incorporated into liposomes results in 'complete' removal of detergent. Second, for the oriented samples, proper dehydration followed by rehydration of the proteoliposomes is essential. By using this protocol, proteoliposome samples for magic-angle spinning NMR and uniformly aligned samples (orientational mosaicity of
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