Abstract
Improving our understanding of nanosecond motions in disordered proteins requires the enhanced sampling of the spectral density function obtained from relaxation at low magnetic fields. High-resolution relaxometry and two-field NMR measurements of relaxation have, so far, only been based on the recording of one- or two-dimensional spectra, which provide insufficient resolution for challenging disordered proteins. Here, we introduce a 3D-HNCO-based two-field NMR experiment for measurements of protein backbone \(^{15}\hbox {N}\) amide longitudinal relaxation rates. The experiment provides accurate longitudinal relaxation rates at low field (0.33 T in our case) preserving the resolution and sensitivity typical for high-field NMR spectroscopy. Radiofrequency pulses applied on six different radiofrequency channels are used to manipulate the spin system at both fields. The experiment was demonstrated on the C-terminal domain of \(\delta\) subunit of RNA polymerase from Bacillus subtilis, a protein with highly repetitive amino-acid sequence and very low dispersion of backbone chemical shifts.
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Acknowledgements
This work was supported by Czech Science Foundation Grant Nos. GA18-04197Y and ANR-18-CE29-0003 provided by agence nationale de la recherche. Short scientific mission of PK to perform measurements at the two-field NMR spectrometer was supported by STSM Grant from the EURELAX COST Action CA15209.
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Thorsten Marquardsen and Jean-Max Tyburn are employees of the Bruker BioSpin. The authors declare no other conflict of interest.
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Jaseňáková, Z., Zapletal, V., Padrta, P. et al. Boosting the resolution of low-field \(^{15}\hbox {N}\) relaxation experiments on intrinsically disordered proteins with triple-resonance NMR. J Biomol NMR 74, 139–145 (2020). https://doi.org/10.1007/s10858-019-00298-6
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DOI: https://doi.org/10.1007/s10858-019-00298-6