Journal ArticleDOI
Bicelle-based liquid crystals for NMR-measurement of dipolar couplings at acidic and basic pH values.
Marcel Ottiger,Ad Bax +1 more
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15N-1H dipolar couplings measured for ubiquitin over the 2.3–10.4pH range indicate that this protein retains a backbone conformation which is very similar to its structure at pH 6.5 over this entire range.Abstract:
It is demonstrated that mixtures of ditetradecyl-phosphatidylcholine or didodecyl-phoshatidylcholine and dihexyl-phosphatidylcholine in water from lyotropic liquid crystalline phases under similar conditions as previously reported for bicelles consisting of dimyristoyl-phosphatidylcholine (DMPC) and dihexanoyl-phosphatidylcholine (DHPC). The carboxy-ester bonds present in DMPC and DHPC are replaced by ether linkages in their alkyl analogs, which prevents acid- or base-catalyzed hydrolysis of these compounds. 15N-1H dipolar couplings measured for ubiquitin over the 2.3-10.4 pH range indicate that this protein retains a backbone conformation which is very similar to its structure at pH 6.5 over this entire range.read more
Citations
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Journal ArticleDOI
Structure of Bax: Coregulation of Dimer Formation and Intracellular Localization
TL;DR: The Bax structure shows that the orientation of helix alpha 9 provides simultaneous control over its mitochondrial targeting and dimer formation.
Book ChapterDOI
Dipolar couplings in macromolecular structure determination.
Journal ArticleDOI
NMR structures of biomolecules using field oriented media and residual dipolar couplings.
TL;DR: Within its relatively short history, nuclear magnetic resonance (NMR) spectroscopy has managed to play an important role in the characterization of biomolecular structure, however, the methods on which most of this characterization has been based, Nuclear Overhauser Effect measurements for short-range distance constraints and scalar couplings measurements for torsional constraints, have limitations.
Journal ArticleDOI
Residual Dipolar Couplings in Structure Determination of Biomolecules
TL;DR: Since the recognition of the potential of RDCs in protein structure determination, applications have spread to nucleic acid structure, carbohydrate structure, protein-ligand interactions, protein domain relationships, high-throughput strategies for structural genomics, and studies of motional amplitudes in flexible assemblies.
References
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Journal ArticleDOI
Structure of ubiquitin refined at 1.8 A resolution.
TL;DR: The crystal structure of human erythrocytic ubiquitin has been refined at 1.8 A resolution using a restrained least-squares procedure and features a number of unusual secondary structural features, including a parallel G1 beta-bulge, two reverse Asx turns, and a symmetrical hydrogen-bonding region that involves the two helices and two of the reverse turns.
Journal ArticleDOI
Direct Measurement of Distances and Angles in Biomolecules by NMR in a Dilute Liquid Crystalline Medium
Nico Tjandra,Ad Bax +1 more
TL;DR: The approach promises to improve the accuracy of structures determined by NMR, and extend the size limit, and distances and angles derived from dipolar couplings in human ubiquitin are in excellent agreement with its crystal structure.
Journal ArticleDOI
Measurement ofJand Dipolar Couplings from Simplified Two-Dimensional NMR Spectra
TL;DR: Dipolar couplings obtained from differences in the splittings measured in the oriented and isotropic phases are in excellent agreement with dipolar coupling obtained from direct measurement of the splitting or from a conventional E. COSY-type measurement.
Journal ArticleDOI
Validation of Protein Structure from Anisotropic Carbonyl Chemical Shifts in a Dilute Liquid Crystalline Phase
TL;DR: In this paper, the magnetic field dependence of 15N chemical shifts in a very weakly magnetically aligned protein-DNA complex was investigated using dipolar coupling constraints in the structure calculation, and it was shown that the minute changes in 15N shift and the very small one-bond 15N-1H and 13CR-1HR dipolar couplings resulted from the fielddependent degree of molecular alignment induced by the magnetic susceptibility anisotropy of the complex.
Journal ArticleDOI
Nuclear magnetic dipole interactions in field-oriented proteins: information for structure determination in solution.
TL;DR: The measurement of dipolar contributions to the splitting of 15N resonances of 1H-15N amide pairs in multidimensional high-field NMR spectra of field-oriented cyanometmyoglobin is reported and implications as an additional source of information for protein structure determination in solution are discussed.
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Direct Measurement of Distances and Angles in Biomolecules by NMR in a Dilute Liquid Crystalline Medium
Nico Tjandra,Ad Bax +1 more