Magic-angle-spinning NMR on solid biological systems. Analysis Of the origin of the spectral linewidths

Hemminga, M.A.; Jager, P.A. de; Krüse, J.; Lamerichs, Rolf

doi:10.1016/0022-2364(87)90244-7

Cited by 5 publications

(12 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1 a and 2). The same intensity ratio and almost the same peak separation has been observed in the 31P NMR spectrum of dry TMV at 121.5 MHz, but the linewidth at 121.5 MHz, 1.5 ppm, is less (Hemminga et al, 1987). The two sideband patterns can be compared with the "ideal" sideband patterns of static chemical shift tensors with various tensor values.…”

Section: Resultssupporting

confidence: 55%

“…Interpretation of the two sideband patterns in terms of "ideal" MAS behavior shows that the apparent chemical shift anisotropy of the minor resonance is larger than the anisotropy of the major resonance. This was also found for dried TMV samples (Hemminga et al, 1987) and can be observed in the MAS NMR spectrum of 10% TMV solution (Cross et al, 1983a) as well, although this effect was not mentioned in the text of this paper. Taking bond angle and arginine binding effects into account, we assign the mi-facher (1981), and the major sideband pattern to sites 2 and 3 (see Analysis of Lineshapes).…”

Section: Analysis Of Sideband Intensitiessupporting

confidence: 69%

“…1 c). These tensor values are slightly reduced as compared with the values obtained from MAS NMR spectra of dry TMV (Hemminga et al, 1987).…”

Section: Resultsmentioning

confidence: 58%

“…Sideband intensities 31P in various nucleic acids, generally occur within the ranges -105 ± 10 ppm and -25 + 2 ppm, respectively (Magusin and Hemminga, 1993a;Hemminga et al, 1987), indicating that conformationally induced changes of Fo and F2 are relatively small. For MAS at an angular frequency (Or, the angles C and ( in Eq.…”

Section: Theorymentioning

confidence: 99%

“…Resonances of inequivalent phosphodiesters in a nucleic acid molecule packed within a virion may therefore be resolved in MAS NMR spectra, if their conformations are sufficiently different. Indeed, 31P MAS NMR spectra of TMV solutions (Cross et al, 1983a) and dried TMV pellets (Hemminga et al, 1987) show two resolved sideband patterns with an overall intensity ratio of approximately 2, which have been assigned by comparing torsion angle values for the three types of phosphodiesters in TMV (Hemminga et al, 1987). MAS NMR spectra of bacteriophage fd, which is closely related to M13, only contain a single, broad centerband flanked by sidebands (DiVerdi and Opella, 1981), indicating that a continuous distribution of phosphodiester conformations is present in the phage, rather than a distinguishable few.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Analysis of 31P MAS NMR spectra and transversal relaxation of bacteriophage M13 and tobacco mosaic virus

Magusin

Hemminga

1994

Biophysical Journal

View full text Add to dashboard Cite

Phosphorus magic angle spinning nuclear magnetic resonance (NMR) spectra and transversal relaxation of M13 and TMV are analyzed by use of a model, which includes both local backbone motions of the encapsulated nucleic acid molecules and overall rotational diffusion of the rod-shaped virions about their length axis. Backbone motions influence the sideband intensities by causing a fast restricted reorientation of the phosphodiesters. To evaluate their influence on the observed sideband patterns, we extend the model that we used previously to analyze nonspinning 31P NMR lineshapes (Magusin, P.C.M.M., and M. A. Hemminga. 1993a. Biophys. J. 64:1861-1868) to magic angle spinning NMR experiments. Backbone motions also influence the conformation of the phosphodiesters, causing conformational averaging of the isotropic chemical shift, which offers a possible explanation for the various linewidths of the centerband and the sidebands observed for M13 gels under various conditions. The change of the experimental lineshape of M13 as a function of temperature and hydration is interpreted in terms of fast restricted fluctuation of the dihedral angles between the POC and the OCH planes on both sides of the 31P nucleus in the nucleic acid backbone. Backbone motions also seem to be the main cause of transversal relaxation measured at spinning rates of 4 kHz or higher. At spinning rates less than 2 kHz, transversal relaxation is significantly faster. This effect is assigned to slow, overall rotation of the rod-shaped M13 phage about its length axis. Equations are derived to simulate the observed dependence of T2e on the spinning rate.

show abstract

Section: Resultssupporting

confidence: 55%

Section: Analysis Of Sideband Intensitiessupporting

confidence: 69%

“…1 c). These tensor values are slightly reduced as compared with the values obtained from MAS NMR spectra of dry TMV (Hemminga et al, 1987).…”

Section: Resultsmentioning

confidence: 58%

Section: Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Analysis of 31P MAS NMR spectra and transversal relaxation of bacteriophage M13 and tobacco mosaic virus

Magusin

Hemminga

1994

Biophysical Journal

View full text Add to dashboard Cite

show abstract

Analysis of 31P nuclear magnetic resonance lineshapes and transversal relaxation of bacteriophage M13 and tobacco mosaic virus

Magusin¹,

Hemminga²

1993

Biophysical Journal

View full text Add to dashboard Cite

The experimentally observed 31P lineshapes and transversal relaxation of 15% (wt/wt) M13, 30% M13, and 30% tobacco mosaic virus (TMV) are compared with lineshapes and relaxation curves that are simulated for various types of rotational diffusion using the models discussed previously (Magusin, P. C. M. M., and M. A. Hemminga. 1993. Biophys. J. 64:1851-1860). It is found that isotropic diffusion cannot explain the observed lineshape effects. A rigid rod diffusion model is only successful in describing the experimental data obtained for 15% M13. For 30% M13 the experimental lineshape and relaxation curve cannot be interpreted consistently and the TMV lineshape cannot even be simulated alone, indicating that the rigid rod diffusion model does not generally apply. A combined diffusion model with fast isolated motions of the encapsulated nucleic acid dominating the lineshape and a slow overall rotation of the virion as a whole, which mainly is reflected in the transversal relaxation, is able to provide a consistent picture for the 15 and 30% M13 samples, but not for TMV. Strongly improved lineshape fits for TMV are obtained assuming that there are three binding sites with different mobilities. The presence of three binding sites is consistent with previous models of TMV. The best lineshapes are simulated for a combination of one mobile and two static sites. Although less markedly, the assumption that two fractions of DNA with different mobilities exist within M13 also improves the simulated lineshapes. The possible existence of two 31P fractions in M13 sheds new light on the nonintegral ratio 2.4:1 between the number of nucleotides and protein coat subunits in the phage: 83% of the viral DNA is less mobile, suggesting that the binding of the DNA molecule to the protein coat actually occurs at the integral ratio of two nucleotides per protein subunit.

show abstract

NMR Studies of Higher-order Structures of Solid Polymers

Kurosu

Ando²,

Yoshimizu

et al. 1994

Annual Reports on NMR Spectroscopy

View full text Add to dashboard Cite

Magic-angle-spinning NMR on solid biological systems. Analysis Of the origin of the spectral linewidths

Cited by 5 publications

References 25 publications

Analysis of 31P MAS NMR spectra and transversal relaxation of bacteriophage M13 and tobacco mosaic virus

Analysis of 31P MAS NMR spectra and transversal relaxation of bacteriophage M13 and tobacco mosaic virus

Analysis of 31P nuclear magnetic resonance lineshapes and transversal relaxation of bacteriophage M13 and tobacco mosaic virus

NMR Studies of Higher-order Structures of Solid Polymers

Contact Info

Product

Resources

About