Abstract
The cell is a crowded environment in which proteins interact specifically with other proteins, nucleic acids, cofactors and ligands. Atomic resolution structural explanation of proteins functioning in this environment is a main goal of biochemical research. Recent improvements to nuclear magnetic resonance (NMR) hardware and methodology allow the measurement of high-resolution heteronuclear multidimensional NMR spectra of macromolecules in living cells (in-cell NMR). In this study, we describe a protocol for the stable isotope (13C, 15N and 2H) labeling and structure determination of proteins overexpressed in Escherichia coli cells exclusively on the basis of information obtained in living cells. The protocol combines the preparation of the protein in E. coli cells, the rapid measurement of the three-dimensional (3D) NMR spectra by nonlinear sampling of the indirectly acquired dimensions, structure calculation and structure refinement. Under favorable circumstances, this in-cell NMR approach can provide high-resolution 3D structures of proteins in living environments. The protocol has been used to solve the first 3D structure of a protein in living cells for the putative heavy metal-binding protein TTHA1718 from Thermus thermophilus HB8 overexpressed in E. coli cells. As no protein purification is necessary, a sample for in-cell NMR measurements can be obtained within 2–3 d. With the nonlinear sampling scheme, the duration of each 3D experiment can be reduced to 2–3 h. Once chemical shift assignments and NOESY peak lists have been prepared, structure calculation with the program CYANA and energy refinement can be completed in less than 1 h on a powerful computer system.
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Acknowledgements
We thank Professor Seiki Kuramitsu for providing the plasmid encoding TTHA1718. This work was supported in part by the CREST program of the Japan Science and Technology Agency (JST), the Molecular Ensemble Program of RIKEN, Grants-in-Aid for Scientific Research of Priority Areas from the Japanese Ministry of Education, Sports, Culture, Science, and Technology on 'Molecular Soft Interactions Regulating Membrane Interface of Biological Systems' and 'Molecular Science for Supra Functional Systems—Development of Advanced Methods for Exploring Elementary Process', and by the Volkswagen Foundation.
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B.O.S., M.S., P.G. and Y.I. designed the research and wrote the article. T.I. developed the protocol for structure calculation and refinement. A.S., D.S., J.H., T.H., M.Y., N.H. and T.M. developed the protocols, including sample preparation and characterization, data acquisition and resonance assignment. Y.S., M.M., D.N. and M.W. contributed the protocol development for rapid NMR data acquisition and MaxEnt processing.
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Ikeya, T., Sasaki, A., Sakakibara, D. et al. NMR protein structure determination in living E. coli cells using nonlinear sampling. Nat Protoc 5, 1051–1060 (2010). https://doi.org/10.1038/nprot.2010.69
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DOI: https://doi.org/10.1038/nprot.2010.69
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