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The three-dimensional structures of membrane proteins are essential for understanding their functions, interactions and architectures. Their requirement for lipids has hampered structure determination by conventional approaches. With optimized samples, it is possible to apply solution NMR methods to small membrane proteins in micelles; however, lipid bilayers are the definitive environment for membrane proteins and this requires solid-state NMR methods. Newly developed solid-state NMR experiments enable completely resolved spectra to be obtained from uniformly isotopically labeled membrane proteins in phospholipid lipid bilayers. The resulting operational constraints can be used for the determination of the structures of membrane proteins.
Marassi et al. (Thu,) studied this question.