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Neutron Spin Echo Spectroscopy as a Unique Probe for Lipid Membrane Dynamics and Membrane-Protein Interactions
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Lipid bilayer preparations of membrane proteins for oriented and magic-angle spinning solid-state NMR samples
Nabanita Das1, Dylan T Murray, Timothy A Cross
11] Institute of Molecular Biophysics (IMB), Florida State University (FSU), Tallahassee, Florida, USA. [2] National High Magnetic Field Laboratory (NMHFL), FSU, Tallahassee, Florida, USA.
Nature Protocols
|October 26, 2013
Summary
This study presents a robust protocol for preparing high-quality membrane protein samples for solid-state NMR. The method ensures complete detergent removal and proper proteoliposome alignment for structural and dynamic studies.
Area of Science:
- Biochemistry
- Structural Biology
- Biophysics
Background:
- Solid-state NMR spectroscopy is crucial for studying membrane proteins in lipid bilayers.
- Achieving native-like structures requires specific environments for membrane proteins.
- Effective sample preparation is critical for successful solid-state NMR studies.
Purpose of the Study:
- To present a detailed and robust protocol for high-quality membrane protein sample preparation.
- To enable both magic-angle spinning (MAS) and oriented-sample solid-state NMR experiments.
- To demonstrate the protocol's efficacy using Mycobacterium tuberculosis proteins CrgA and Rv1861.
Main Methods:
- Reconstitution of membrane proteins into liposomes from detergent environments.
- Ensuring complete detergent removal during reconstitution.
- Optimizing proteoliposome preparation through controlled dehydration and rehydration for oriented samples.
Main Results:
- The protocol yields high-quality membrane protein samples suitable for solid-state NMR.
- Complete detergent removal was achieved during protein reconstitution into liposomes.
- Uniformly aligned proteoliposome samples with <1° orientational mosaicity were obtained for oriented-sample NMR.
- Samples for both MAS and oriented-sample NMR were prepared within 10 days.
Conclusions:
- The developed protocol is effective for preparing membrane protein samples for diverse solid-state NMR applications.
- The method facilitates detailed structural and dynamic characterization of membrane proteins in near-native environments.
- This protocol advances the study of membrane protein structure-dynamics and interactions using solid-state NMR.
