Abstract
The preparation of stable isotope-labeled proteins is important for NMR studies, however, it is often hampered in the case of eukaryotic proteins which are not readily expressed in Escherichia coli. Such proteins are often conveniently investigated following post-expression chemical isotope tagging. Enzymatic 15N-labeling of glutamine side chains using transglutaminase (TGase) has been applied to several proteins for NMR studies. 19F-labeling is useful for interaction studies due to its high NMR sensitivity and susceptibility. Here, 19F-labeling of glutamine side chains using TGase and 2,2,2-trifluoroethylamine hydrochloride was established for use in an NMR study. This enzymatic 19F-labeling readily provided NMR detection of protein-drug and protein–protein interactions with complexes of about 100 kDa since the surface residues provided a good substrate for TGase. The 19F-labeling method was 3.5-fold more sensitive than 15N-labeling, and could be combined with other chemical modification techniques such as lysine 13C-methylation. 13C-dimethylated-19F-labeled FKBP12 provided more accurate information concerning the FK506 binding site.
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Acknowledgements
We thank M. Yoneyama for the plasmid constructions and protein purification of GF14b mutants. This work was supported in part by KAKENHI, PDIS, and AMED-CREST from JST, MEXT and AMED. Funding was provided by Ministry of Education, Culture, Sports, Science and Technology; Japan Agency for Medical Research and Development; and Ministry of Education, Culture, Sports, Science and Technology.
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Hattori, Y., Heidenreich, D., Ono, Y. et al. Protein 19F-labeling using transglutaminase for the NMR study of intermolecular interactions. J Biomol NMR 68, 271–279 (2017). https://doi.org/10.1007/s10858-017-0125-6
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DOI: https://doi.org/10.1007/s10858-017-0125-6