Abstract
A new strategy for the simultaneous NMR assignment of both backbone and side chain amides in large proteins with isotopomer-selective transverse-relaxation-optimized spectroscopy (IS-TROSY) is reported. The method considers aspects of both the NMR sample preparation and the experimental design. First, the protein is dissolved in a buffer with 50%H2O/50%D2O in order to promote the population of semideuterated NHD isotopomers in side chain amides of Asn/Gln residues. Second, a 13C′-coupled 2D 15N–1H IS-TROSY spectrum provides a stereospecific distinction between the geminal protons in the E and Z configurations of the carboxyamide group. Third, a suite of IS-TROSY-based triple-resonance NMR experiments, e.g. 3D IS-TROSY-HNCA and 3D IS-TROSY-HNCACB, are designed to correlate aliphatic carbon atoms with backbone amides and, for Asn/Gln residues, at the same time with side chain amides. The NMR assignment procedure is similar to that for small proteins using conventional 3D HNCA/3D HNCACB spectra, in which, however, signals from NH2 groups are often very weak or even missing due to the use of broad-band proton decoupling schemes and NOE data have to be used as a remedy. For large proteins, the use of conventional TROSY experiments makes resonances of side chain amides not observable at all. The application of IS-TROSY experiments to the 35-kDa yeast cytosine deaminase has established a complete resonance assignment for the backbone and stereospecific assignment for side chain amides, which otherwise could not be achieved with existing NMR experiments. Thus, the development of IS-TROSY-based method provides new opportunities for the NMR study of important structural and biological roles of carboxyamides and side chain moieties of arginine and lysine residues in large proteins as well as amino moieties in nucleic acids.
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Abbreviations
- IS:
-
isotopomer-selective
- TROSY:
-
transverse-relaxation-optimized spectroscopy.
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Acknowledgements
This work made use of a Bruker AVANCE 900 MHz NMR spectrometer funded in part by Michigan Economic Development Corporation and a Varian INOVA 600 MHz NMR spectrometer funded in part by NSF Grant BIR9512253. The work was supported in part by NIH Grant GM58221 (H.Y.). A.L. was a recipient of IRGP New Faculty Awards at MSU.
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Liu, A., Li, Y., Yao, L. et al. Simultaneous NMR assignment of backbone and side chain amides in large proteins with IS-TROSY. J Biomol NMR 36, 205–214 (2006). https://doi.org/10.1007/s10858-006-9072-3
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DOI: https://doi.org/10.1007/s10858-006-9072-3