Evaluation of backbone proton positions and dynamics in a small protein by liquid crystal NMR spectroscopyUlmer, T.S., Ramirez, B.E., Delaglio, F., Bax, A.
(2003) J.Am.Chem.Soc. 125: 9179-9191
- PubMed: 15369375
- DOI: 10.1021/ja0350684
- Primary Citation of Related Structures:
- PubMed Abstract:
- The third IGG-binding domain from Streptococcal protein G. An analysis by X-ray crystallography of the structure alone and in a complex with FAB
Derrick, J.P.,Wiggley, D.B.
(1994) J.Mol.Biol. 243: 906
NMR measurements of a large set of protein backbone one-bond dipolar couplings have been carried out to refine the structure of the third IgG-binding domain of Protein G (GB3), previously solved by X-ray crystallography at a resolution of 1.1 A. Besi ...
NMR measurements of a large set of protein backbone one-bond dipolar couplings have been carried out to refine the structure of the third IgG-binding domain of Protein G (GB3), previously solved by X-ray crystallography at a resolution of 1.1 A. Besides the commonly used bicelle, poly(ethylene glycol), and filamentous phage liquid crystalline media, dipolar couplings were also measured when the protein was aligned inside either positively or negatively charged stretched acrylamide gels. Refinement of the GB3 crystal structure against the (13)C(alpha)-(13)C' and (13)C'-(15)N dipolar couplings improves the agreement between experimental and predicted (15)N-(1)H(N) as well as (13)C(alpha)-(1)H(alpha) dipolar couplings. Evaluation of the peptide bond N-H orientations shows a weak anticorrelation between the deviation of the peptide bond torsion angle omega from 180 degrees and the angle between the N-H vector and the C'-N-C(alpha) plane. The slope of this correlation is -1, indicating that, on average, pyramidalization of the peptide N contributes to small deviations from peptide bond planarity (
Contribution from the Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892, USA.