Direct measurement of distances and angles in biomolecules by NMR in a dilute liquid crystalline medium
- PMID: 9353189
- DOI: 10.1126/science.278.5340.1111
Direct measurement of distances and angles in biomolecules by NMR in a dilute liquid crystalline medium
Erratum in
- Science 1997 Dec 5;278(5344):1697
Abstract
In isotropic solution, internuclear dipolar couplings average to zero as a result of rotational diffusion. By dissolving macromolecules in a dilute aqueous nematic discotic liquid-crystalline medium containing widely spaced magnetically oriented particles, a tunable degree of solute alignment with the magnetic field can be created while retaining the high resolution and sensitivity of the regular isotropic nuclear magnetic resonance (NMR) spectrum. Dipolar couplings between 1H-1H, 1H-13C, 1H-15N, and 13C-13C pairs in such an oriented macromolecule no longer average to zero, and are readily measured. Distances and angles derived from dipolar couplings in human ubiquitin are in excellent agreement with its crystal structure. The approach promises to improve the accuracy of structures determined by NMR, and extend the size limit.
Comment in
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Lining up proteins for NMR.Science. 1997 Nov 7;278(5340):1015-6. doi: 10.1126/science.278.5340.1015. Science. 1997. PMID: 9381199 No abstract available.
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