Abstract
We introduce an efficient approach for sequential protein backbone assignment based on two complementary proton-detected 4D solid-state NMR experiments that correlate \( {\text{H}}_{{\text{i}}}^{{\text{N}}} \)/Ni with CAi/COi or CAi−1/COi−1. The resulting 4D spectra exhibit excellent sensitivity and resolution and are amenable to (semi-)automatic assignment approaches. This strategy allows to obtain sequential connections with high confidence as problems related to peak overlap and multiple assignment possibilities are avoided. Non-uniform sampling schemes were implemented to allow for the acquisition of 4D spectra within a few days. Rather moderate hardware requirements enable the successful demonstration of the method on deuterated type III secretion needles using a 600 MHz spectrometer at a spinning rate of 25 kHz.
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Acknowledgments
We thank Karin Giller and Brigitta Angerstein for expert technical assistance. This work was supported by the Max Planck Society, the Leibniz-Institut für Molekulare Pharmakologie and the DFG (Emmy Noether Fellowship to A.L). A.L. and S.X. acknowledge funding from the CRC803 (DFG).
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Xiang, S., Chevelkov, V., Becker, S. et al. Towards automatic protein backbone assignment using proton-detected 4D solid-state NMR data. J Biomol NMR 60, 85–90 (2014). https://doi.org/10.1007/s10858-014-9859-6
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DOI: https://doi.org/10.1007/s10858-014-9859-6