期刊
JOURNAL OF BIOMOLECULAR NMR
卷 47, 期 4, 页码 249-258出版社
SPRINGER
DOI: 10.1007/s10858-010-9427-7
关键词
NMR; Stretched gel; Polyacrylamide gel; Carbonyl CSA; Amide nitrogen CSA; Residual dipolar coupling
资金
- National Institute of General Medical Sciences of the NIH [R01 GM61268]
Residual dipolar coupling (RDC) and residual chemical shift anisotropy (RCSA) report on orientational properties of a dipolar bond vector and a chemical shift anisotropy principal axis system, respectively. They can be highly complementary in the analysis of backbone structure and dynamics in proteins as RCSAs generally include a report on vectors out of a peptide plane while RDCs usually report on in-plane vectors. Both RDC and RCSA average to zero in isotropic solutions and require partial orientation in a magnetic field to become observable. While the alignment and measurement of RDC has become routine, that of RCSA is less common. This is partly due to difficulties in providing a suitable isotopic reference spectrum for the measurement of the small chemical shift offsets coming from RCSA. Here we introduce a device (modified NMR tube) specifically designed for accurate measurement of reference and aligned spectra for RCSA measurements, but with a capacity for RDC measurements as well. Applications to both soluble and membrane anchored proteins are illustrated.
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