Abstract
The geometric information used to solve three-dimensional (3D) structures of proteins by NMR spectroscopy resides in short (<5 Å) interproton-distance data1,2. To obtain these distances, the 1H-NMR spectrum must first be assigned using correlation and nuclear Overhauser effect (NOE) experiments to demonstrate through-bond (scalar) and through-space connectivities, respectively. Because the NOE is proportional to r–6, distance information can then be derived. The increased resolution afforded by extending NMR experiments into a second dimension3 enables one to detect and interpret effects that would not be possible in one dimension owing to extensive spectral overlap and much reduced information. A number of small protein structures have previously been solved in this way1,2. Extending this methodology to larger proteins, however, requires yet an additional improvement in resolution as overlap of cross-peaks in the two-dimensional (2D) NMR spectra present a major barrier to their unambiguous identification. One way of increasing the resolution is to extend the 2D-NMR experiments into a third dimension. We report here the applicability of three-dimensional NMR to macromolecules using the 46-residue protein al-purothionin as an example.
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Oschkinat, H., Griesinger, C., Kraulis, P. et al. Three-dimensional NMR spectroscopy of a protein in solution. Nature 332, 374–376 (1988). https://doi.org/10.1038/332374a0
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DOI: https://doi.org/10.1038/332374a0
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