Abstract
G protein-coupled receptors (GPCRs) exist in equilibrium between multiple conformations, and their populations and exchange rates determine their functions. However, analyses of the conformational dynamics of GPCRs in lipid bilayers are still challenging, because methods for observations of NMR signals of large proteins expressed in a baculovirus-insect cell expression system (BVES) are limited. Here, we report a method to incorporate methyl-13C1H3-labeled alanine with > 45% efficiency in highly deuterated proteins expressed in BVES. Application of the method to the NMR observations of β2-adrenergic receptor in micelles and in nanodiscs revealed the ligand-induced conformational differences throughout the transmembrane region of the GPCR.
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Acknowledgements
This work was supported by the development of core technologies for innovative drug development based upon IT, from the Japan Agency for Medical Research and Development, AMED, and by the Ministry of Education, Culture, Sports, Science and Technology (MEXT)/Japan Society for the Promotion of Science (JSPS) KAKENHI Grant Numbers JP16H01353, JP16H01531, JP17H04999, JP17H06097, JP17J11420. Y.S. and M.N. are JSPS fellows.
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Kofuku, Y., Yokomizo, T., Imai, S. et al. Deuteration and selective labeling of alanine methyl groups of β2-adrenergic receptor expressed in a baculovirus-insect cell expression system. J Biomol NMR 71, 185–192 (2018). https://doi.org/10.1007/s10858-018-0174-5
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DOI: https://doi.org/10.1007/s10858-018-0174-5