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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Das, Bibhuti B. Lin, Eugene C. Opella, Stanley J. |
| Description | Author Affiliation: Das BB ( University of California, San Diego , 9500 Gilman Drive, 0307 La Jolla, California 92093-0307, United States.) |
| Abstract | Structure determination by solid-state NMR of proteins is rapidly advancing as a result of recent developments of samples, experimental methods, and calculations. There are a number of different solid-state NMR approaches that utilize stationary samples, aligned samples, or magic angle spinning of unoriented 'powder' samples, and depending on the sample and the experimental method they can emphasize the measurement of distances or angles, ideally both, as sources of structural constraints. Multidimensional correlation spectroscopy of low-gamma nuclei such as (15)N and (13)C is an important step for making resonance assignments and measurements of angular restraints in membrane proteins. However, the efficiency of coherence transfer predominantly depends upon the strength of the dipole-dipole interaction, and this can vary from site to site and between sample alignments, for example, during the mixing of (13)C and (15)N magnetization in stationary aligned and in magic angle spinning samples. Here, we demonstrate that the efficiency of polarization transfer can be improved by using adiabatic demagnetization and remagnetization techniques on stationary aligned samples, and proton assisted insensitive nuclei cross-polarization in magic angle sample spinning samples. The adiabatic cross-polarization technique provides an alternative mechanism for spin-diffusion experiments correlating (15)N/(15)N and (15)N/(13)C chemical shifts over large distances. Improved efficiency in cross-polarization with 40-100% sensitivity enhancements is observed in proteins and single crystals, respectively. We describe solid-state NMR experimental techniques that are optimal for membrane proteins in liquid crystalline phospholipid bilayers under physiological conditions. The techniques are illustrated with data from single crystals both of peptides and of membrane proteins in phospholipid bilayers. |
| ISSN | 15206106 |
| e-ISSN | 15205207 |
| Journal | The Journal of Physical Chemistry B |
| Issue Number | 41 |
| Volume Number | 117 |
| Language | English |
| Publisher | American Chemical Society (United States) |
| Publisher Date | 2013-10-17 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Membrane Proteins Chemistry Nuclear Magnetic Resonance, Biomolecular Lipid Bilayers Liquid Crystals Phospholipids Research Support, N.I.H., Extramural Physical chemistry |
| Content Type | Text |
| Resource Type | Article |
| Subject | Surfaces, Coatings and Films Materials Chemistry Medicine Physical and Theoretical Chemistry |
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