Abstract
Dynamic nuclear polarization (DNP) has become a powerful method to enhance spectroscopic sensitivity in the context of magnetic resonance imaging and nuclear magnetic resonance spectroscopy. We show that, compared to DNP at lower field (400 MHz/263 GHz), high field DNP (800 MHz/527 GHz) can significantly enhance spectral resolution and allows exploitation of the paramagnetic relaxation properties of DNP polarizing agents as direct structural probes under magic angle spinning conditions. Applied to a membrane-embedded K+ channel, this approach allowed us to refine the membrane-embedded channel structure and revealed conformational substates that are present during two different stages of the channel gating cycle. High-field DNP thus offers atomic insight into the role of molecular plasticity during the course of biomolecular function in a complex cellular environment.
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Abbreviations
- AT:
-
Ambient temperature
- DNP:
-
Dynamic nuclear polarization
- LT:
-
Low temperature
- MAS:
-
Magic angle spinning
- PRE:
-
Paramagnetic relaxation enhancement
- ssNMR:
-
Solid-state nuclear magnetic resonance
- TM:
-
Transmembrane helix
- MRI:
-
Magnetic resonance imaging
- SF:
-
Selectivity filter
- PDSD:
-
Proton-driven spin diffusion
- TOTAPOL:
-
1-(TEMPO-4-oxy)-3-(TEMPO-4-amino)propan-2-ol
- AMUPol:
-
(15-{[(7-oxyl-3,11-dioxa-7-azadispiro[5.1.5.3]hexadec-15-yl)carbamoyl][2-(2,5,8,11-tetraoxatridecan-13-ylamino)}-[3,11-dioxa-7-azadispiro[5.1.5.3]hexadec-7-yl])oxidanyl
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Acknowledgments
We thank Mark Daniels for excellent technical support. This work was supported by NWO (grants 722.012.002 to MW and 700.11.344 and 700.58.102 to MB), DFG (Po137, 40-1 and 41-1) and NIH (NIH/NIGNS grant GM087519).
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Eline J. Koers and Elwin A. W. van der Cruijsen have contributed equally.
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Koers, E.J., van der Cruijsen, E.A.W., Rosay, M. et al. NMR-based structural biology enhanced by dynamic nuclear polarization at high magnetic field. J Biomol NMR 60, 157–168 (2014). https://doi.org/10.1007/s10858-014-9865-8
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DOI: https://doi.org/10.1007/s10858-014-9865-8