Abstract
Relaxation parameters such as longitudinal relaxation are susceptible to artifacts such as spin diffusion, and can be affected by paramagnetic impurities as e.g. oxygen, which make a quantitative interpretation difficult. We present here the site-specific measurement of [1H]13C and [1H]15N heteronuclear rates in an immobilized protein. For methyls, a strong effect is expected due to the three-fold rotation of the methyl group. Quantification of the [1H]13C heteronuclear NOE in combination with 13C-R 1 can yield a more accurate analysis of side chain motional parameters. The observation of significant [1H]15N heteronuclear NOEs for certain backbone amides, as well as for specific asparagine/glutamine sidechain amides is consistent with MD simulations. The measurement of site-specific heteronuclear NOEs is enabled by the use of highly deuterated microcrystalline protein samples in which spin diffusion is reduced in comparison to protonated samples.
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Acknowledgments
This research was supported by the Helmholtz-Gemeinschaft, the Leibniz-Gemeinschaft and the DFG (Re1435, SFB1035). We are grateful to the Center for Integrated Protein Science Munich (CIPS-M) for financial support.
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Juan Miguel Lopez del Amo and Vipin Agarwal have contributed equally to this work.
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Amo, J.M.L.d., Agarwal, V., Sarkar, R. et al. Site-specific analysis of heteronuclear Overhauser effects in microcrystalline proteins. J Biomol NMR 59, 241–249 (2014). https://doi.org/10.1007/s10858-014-9843-1
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DOI: https://doi.org/10.1007/s10858-014-9843-1