Abstract
The ongoing NMR method development effort strives for high quality multidimensional data with reduced collection time. Here, we apply ‘SOFAST-HMQC’ to frequency editing in 3D NOESY experiments and demonstrate the sensitivity benefits using highly deuterated and 15N, methyl labeled samples in H2O. The experiments benefit from a combination of selective T 1 relaxation (or L-optimized effect), from Ernst angle optimization and, in certain types of experiments, from using the mixing time for both NOE buildup and magnetization recovery. This effect enhances sensitivity by up to 2.4× at fast pulsing versus reference HMQC sequences of same overall length and water suppression characteristics. Representative experiments designed to address interesting protein NMR challenges are detailed. Editing capabilities are exploited with heteronuclear 15N,13C-edited, or with diagonal-free 13C aromatic/methyl-resolved 3D-SOFAST-HMQC–NOESY–HMQC. The latter experiment is used here to elucidate the methyl-aromatic NOE network in the hydrophobic core of the 19 kDa FliT-FliJ flagellar protein complex. Incorporation of fast pulsing to reference experiments such as 3D-NOESY–HMQC boosts digital resolution, simplifies the process of NOE assignment and helps to automate protein structure determination.
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Acknowledgements
The authors thank Lewis Kay, Nik Sgourakis and Yoan Monneau for helpful discussions and Tao Xie and Yajun Jiang for supplying test samples.
Funding
This work is financially supported by the NIH grants AI094623 and AI121858 to C.G.K. and by Minnesota NMR Center (MNMR).
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Paolo Rossi and Youlin Xia have contributed equally to this work.
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Rossi, P., Xia, Y., Khanra, N. et al. 15N and 13C- SOFAST-HMQC editing enhances 3D-NOESY sensitivity in highly deuterated, selectively [1H,13C]-labeled proteins. J Biomol NMR 66, 259–271 (2016). https://doi.org/10.1007/s10858-016-0074-5
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DOI: https://doi.org/10.1007/s10858-016-0074-5