201
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Maly T, Andreas LB, Smith AA, Griffin RG. 2H-DNP-enhanced 2H-13C solid-state NMR correlation spectroscopy. Phys Chem Chem Phys 2010; 12:5872-8. [PMID: 20458422 DOI: 10.1039/c003705b] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Perdeuteration of biological macromolecules for magic angle spinning solid-state NMR spectroscopy can yield high-resolution (2)H-(13)C correlation spectra and the method is therefore of great interest for the structural biology community. Here we demonstrate that the combination of sample deuteration and dynamic nuclear polarization yields resolved (2)H-(13)C correlation spectra with a signal enhancement of epsilon > or = 700 compared to a spectrum recorded with microwaves off and otherwise identical conditions. To our knowledge, this is the first time that (2)H-DNP has been employed to enhance MAS-NMR spectra of a biologically relevant system. The DNP process is studied using several polarizing agents and the technique is applied to obtain (2)H-(13)C correlation spectra of U-[(2)H, (13)C] proline.
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Affiliation(s)
- Thorsten Maly
- Francis Bitter Magnet Laboratory and Department of Chemistry, Cambridge, MA 02139, USA
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202
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Ysacco C, Rizzato E, Virolleaud MA, Karoui H, Rockenbauer A, Le Moigne F, Siri D, Ouari O, Griffin RG, Tordo P. Properties of dinitroxides for use in dynamic nuclear polarization (DNP). Phys Chem Chem Phys 2010; 12:5841-5. [PMID: 20458376 DOI: 10.1039/c002591g] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have investigated the properties of a series of dinitroxides as polarizing agents for SS NMR/DNP applications. Our results clearly establish that an orthogonal relative orientation of electron g tensors is a crucial requirement to obtain high enhancement DNP factors. Moreover, the ratio of the proton Larmor frequency over the e(-)-e(-) dipolar coupling (omega(H)/omega(D)) influences the efficiency of the cross effect (CE) mechanism, thus the Ree distance between the unpaired electrons must be adapted to omega(H).
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Affiliation(s)
- Cédric Ysacco
- SREP LCP UMR 6264, CNRS et Universités d'Aix Marseille 1, 2 et 3, Faculté de St Jérôme case 521, 13013 Marseille, France
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203
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Debelouchina GT, Bayro MJ, van der Wel PCA, Caporini MA, Barnes AB, Rosay M, Maas WE, Griffin RG. Dynamic nuclear polarization-enhanced solid-state NMR spectroscopy of GNNQQNY nanocrystals and amyloid fibrils. Phys Chem Chem Phys 2010; 12:5911-9. [PMID: 20454733 DOI: 10.1039/c003661g] [Citation(s) in RCA: 109] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Dynamic nuclear polarization (DNP) utilizes the inherently larger polarization of electrons to enhance the sensitivity of conventional solid-state NMR experiments at low temperature. Recent advances in instrumentation development and sample preparation have transformed this field and have opened up new opportunities for its application to biological systems. Here, we present DNP-enhanced (13)C-(13)C and (15)N-(13)C correlation experiments on GNNQQNY nanocrystals and amyloid fibrils acquired at 9.4 T and 100 K and demonstrate that DNP can be used to obtain assignments and site-specific structural information very efficiently. We investigate the influence of temperature on the resolution, molecular conformation, structural integrity and dynamics in these two systems. In addition, we assess the low-temperature performance of two commonly used solid-state NMR experiments, proton-driven spin diffusion (PDSD) and transferred echo double resonance (TEDOR), and discuss their potential as tools for measurement of structurally relevant distances at low temperature in combination with DNP.
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Affiliation(s)
- Galia T Debelouchina
- Department of Chemistry and Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
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204
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Salnikov E, Rosay M, Pawsey S, Ouari O, Tordo P, Bechinger B. Solid-State NMR Spectroscopy of Oriented Membrane Polypeptides at 100 K with Signal Enhancement by Dynamic Nuclear Polarization. J Am Chem Soc 2010; 132:5940-1. [DOI: 10.1021/ja1007646] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Evgeniy Salnikov
- Insitut de Chimie, Université de Strasbourg-CNRS UMR7177, 4 rue Blaise Pascal, 67070 Strasbourg, France, Bruker BioSpin Corporation, 15 Fortune Drive, Billerica, Massachusetts 01821, and Université de Provence-CNRS UMR6264, av. Normandie-Niemen 13397 Marseille cédex 20, France
| | - Melanie Rosay
- Insitut de Chimie, Université de Strasbourg-CNRS UMR7177, 4 rue Blaise Pascal, 67070 Strasbourg, France, Bruker BioSpin Corporation, 15 Fortune Drive, Billerica, Massachusetts 01821, and Université de Provence-CNRS UMR6264, av. Normandie-Niemen 13397 Marseille cédex 20, France
| | - Shane Pawsey
- Insitut de Chimie, Université de Strasbourg-CNRS UMR7177, 4 rue Blaise Pascal, 67070 Strasbourg, France, Bruker BioSpin Corporation, 15 Fortune Drive, Billerica, Massachusetts 01821, and Université de Provence-CNRS UMR6264, av. Normandie-Niemen 13397 Marseille cédex 20, France
| | - Olivier Ouari
- Insitut de Chimie, Université de Strasbourg-CNRS UMR7177, 4 rue Blaise Pascal, 67070 Strasbourg, France, Bruker BioSpin Corporation, 15 Fortune Drive, Billerica, Massachusetts 01821, and Université de Provence-CNRS UMR6264, av. Normandie-Niemen 13397 Marseille cédex 20, France
| | - Paul Tordo
- Insitut de Chimie, Université de Strasbourg-CNRS UMR7177, 4 rue Blaise Pascal, 67070 Strasbourg, France, Bruker BioSpin Corporation, 15 Fortune Drive, Billerica, Massachusetts 01821, and Université de Provence-CNRS UMR6264, av. Normandie-Niemen 13397 Marseille cédex 20, France
| | - Burkhard Bechinger
- Insitut de Chimie, Université de Strasbourg-CNRS UMR7177, 4 rue Blaise Pascal, 67070 Strasbourg, France, Bruker BioSpin Corporation, 15 Fortune Drive, Billerica, Massachusetts 01821, and Université de Provence-CNRS UMR6264, av. Normandie-Niemen 13397 Marseille cédex 20, France
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205
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Gabellieri C, Mugnaini V, Paniagua J, Roques N, Oliveros M, Feliz M, Veciana J, Pons M. Dynamic Nuclear Polarization with Polychlorotriphenylmethyl Radicals: Supramolecular Polarization-Transfer Effects. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.201000031] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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206
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Gabellieri C, Mugnaini V, Paniagua J, Roques N, Oliveros M, Feliz M, Veciana J, Pons M. Dynamic Nuclear Polarization with Polychlorotriphenylmethyl Radicals: Supramolecular Polarization-Transfer Effects. Angew Chem Int Ed Engl 2010; 49:3360-2. [DOI: 10.1002/anie.201000031] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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207
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Porel M, Ottaviani MF, Jockusch S, Jayaraj N, Turro NJ, Ramamurthy V. Suppression of spin–spin coupling in nitroxyl biradicals by supramolecular host–guest interactions. Chem Commun (Camb) 2010; 46:7736-8. [DOI: 10.1039/c0cc02587a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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208
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Matsuki Y, Takahashi H, Ueda K, Idehara T, Ogawa I, Toda M, Akutsu H, Fujiwara T. Dynamic nuclear polarization experiments at 14.1 T for solid-state NMR. Phys Chem Chem Phys 2010; 12:5799-803. [DOI: 10.1039/c002268c] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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209
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Functional and shunt states of bacteriorhodopsin resolved by 250 GHz dynamic nuclear polarization-enhanced solid-state NMR. Proc Natl Acad Sci U S A 2009; 106:9244-9. [PMID: 19474298 DOI: 10.1073/pnas.0900908106] [Citation(s) in RCA: 261] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Observation and structural studies of reaction intermediates of proteins are challenging because of the mixtures of states usually present at low concentrations. Here, we use a 250 GHz gyrotron (cyclotron resonance maser) and cryogenic temperatures to perform high-frequency dynamic nuclear polarization (DNP) NMR experiments that enhance sensitivity in magic-angle spinning NMR spectra of cryo-trapped photocycle intermediates of bacteriorhodopsin (bR) by a factor of approximately 90. Multidimensional spectroscopy of U-(13)C,(15)N-labeled samples resolved coexisting states and allowed chemical shift assignments in the retinylidene chromophore for several intermediates not observed previously. The correlation spectra reveal unexpected heterogeneity in dark-adapted bR, distortion in the K state, and, most importantly, 4 discrete L substates. Thermal relaxation of the mixture of L's showed that 3 of these substates revert to bR(568) and that only the 1 substate with both the strongest counterion and a fully relaxed 13-cis bond is functional. These definitive observations of functional and shunt states in the bR photocycle provide a preview of the mechanistic insights that will be accessible in membrane proteins via sensitivity-enhanced DNP NMR. These observations would have not been possible absent the signal enhancement available from DNP.
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