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Yeliseev A, van den Berg A, Zoubak L, Hines K, Stepnowski S, Williston K, Yan W, Gawrisch K, Zmuda J. Thermostability of a recombinant G protein-coupled receptor expressed at high level in mammalian cell culture. Sci Rep 2020; 10:16805. [PMID: 33033368 PMCID: PMC7546613 DOI: 10.1038/s41598-020-73813-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Accepted: 09/15/2020] [Indexed: 12/13/2022] Open
Abstract
Rational design of pharmaceutical drugs targeting integral membrane G protein-coupled receptors (GPCR) requires thorough understanding of ligand binding and mechanism of activation through high resolution structural studies of purified proteins. Due to inherent conformational flexibility of GPCR, stabilization of these proteins solubilized from cell membranes into detergents is a challenging task. Here, we take advantage of naturally occurring post-translational modifications for stabilization of purified GPCR in detergent micelles. The recombinant cannabinoid CB2 receptor was expressed at high yield in Expi293F mammalian cell cultures, solubilized and purified in Façade detergent. We report superior stability of the mammalian cell-expressed receptor compared to its E.coli-expressed counterpart, due to contributions from glycosylation of the N terminus and palmitoylation of the C terminus of CB2. Finally, we demonstrate that the mammalian Expi293F amino acid labelling kit is suitable for preparation of multi-milligram quantities of high quality, selectively stable isotope-labeled GPCR for studies by nuclear magnetic resonance.
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Affiliation(s)
- Alexei Yeliseev
- National Institute on Alcoholism and Alcohol Abuse, NIH, Bethesda, MD, 20892, USA.
| | | | - Lioudmila Zoubak
- National Institute on Alcoholism and Alcohol Abuse, NIH, Bethesda, MD, 20892, USA
| | - Kirk Hines
- National Institute on Alcoholism and Alcohol Abuse, NIH, Bethesda, MD, 20892, USA
| | - Sam Stepnowski
- ThermoFisher Scientific, 7335 Executive Way, Frederick, MD, 21704, USA
| | - Kyle Williston
- ThermoFisher Scientific, 7335 Executive Way, Frederick, MD, 21704, USA
| | - Wanhua Yan
- ThermoFisher Scientific, 7335 Executive Way, Frederick, MD, 21704, USA
| | - Klaus Gawrisch
- National Institute on Alcoholism and Alcohol Abuse, NIH, Bethesda, MD, 20892, USA
| | - Jonathan Zmuda
- ThermoFisher Scientific, 7335 Executive Way, Frederick, MD, 21704, USA
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