Abstract
Organic synthesis of a ligand with high binding affinities for paramagnetic lanthanide ions is an effective way of generating paramagnetic effects on proteins. These paramagnetic effects manifested in high-resolution NMR spectroscopy are valuable dynamic and structural restraints of proteins and protein–ligand complexes. A paramagnetic tag generally contains a metal chelating moiety and a reactive group for protein modification. Herein we report two new DTPA-like tags, 4PS-PyDTTA and 4PS-6M-PyDTTA that can be site-specifically attached to a protein with a stable thioether bond. Both protein-tag adducts form stable lanthanide complexes, of which the binding affinities and paramagnetic tensors are tunable with respect to the 6-methyl group in pyridine. Paramagnetic relaxation enhancement (PRE) effects of Gd(III) complex on protein-tag adducts were evaluated in comparison with pseudocontact shift (PCS), and the results indicated that both 4PS-PyDTTA and 4PS-6M-PyDTTA tags are rigid and present high-quality PREs that are crucially important in elucidation of the dynamics and interactions of proteins and protein-ligand complexes. We also show that these two tags are suitable for in-situ protein NMR analysis.
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This work was supported by the National Key R&D Program of China (2016YFA0501202) and the Natural Science Foundation of China (21673122 and 21473095).
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Jia-Liang Chen and Yu Zhao have contributed equally.
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Chen, JL., Zhao, Y., Gong, YJ. et al. Stable and rigid DTPA-like paramagnetic tags suitable for in vitro and in situ protein NMR analysis. J Biomol NMR 70, 77–92 (2018). https://doi.org/10.1007/s10858-017-0160-3
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DOI: https://doi.org/10.1007/s10858-017-0160-3