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Default Dipolar Assisted Assignment Protocol (DAAP) for MAS solid-state NMR of Rotationally Aligned Membrane Proteins in Phospholipid Bilayers

Dipolar Assisted Assignment Protocol (DAAP) for MAS solid-state NMR of Rotationally Aligned Membrane Proteins in Phospholipid Bilayers

Publication date: Available online 1 March 2014
Source:Journal of Magnetic Resonance

Author(s): Bibhuti B. Das , Hua Zhang , Stanley J. Opella

A method for making resonance assignments in magic angle spinning solid-state NMR spectra of membrane proteins that utilizes the range of hetero-nuclear dipolar coupling frequencies in combination with conventional chemical shift based assignment methods is demonstrated. The dipolar assisted assignment protocol (DAAP) takes advantage of the rotational alignment of the membrane proteins in liquid crystalline phospholipid bilayers. Improved resolution is obtained by combining the magnetically inequivalent heteronuclear dipolar frequencies with isotropic chemical shift frequencies. Spectra with both dipolar and chemical shift frequency axes assist with resonance assignments. DAAP can be readily extended to three- and four- dimensional experiments and to include both backbone and side chain sites in proteins.
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