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Becker-Baldus J, Yeliseev A, Joseph TT, Sigurdsson ST, Zoubak L, Hines K, Iyer MR, van den Berg A, Stepnowski S, Zmuda J, Gawrisch K, Glaubitz C. Probing the Conformational Space of the Cannabinoid Receptor 2 and a Systematic Investigation of DNP-Enhanced MAS NMR Spectroscopy of Proteins in Detergent Micelles. ACS Omega 2023; 8:32963-32976. [PMID: 37720784 PMCID: PMC10500644 DOI: 10.1021/acsomega.3c04681] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Accepted: 08/09/2023] [Indexed: 09/19/2023]
Abstract
Tremendous progress has been made in determining the structures of G-protein coupled receptors (GPCR) and their complexes in recent years. However, understanding activation and signaling in GPCRs is still challenging due to the role of protein dynamics in these processes. Here, we show how dynamic nuclear polarization (DNP)-enhanced magic angle spinning nuclear magnetic resonance in combination with a unique pair labeling approach can be used to study the conformational ensemble at specific sites of the cannabinoid receptor 2. To improve the signal-to-noise, we carefully optimized the DNP sample conditions and utilized the recently introduced AsymPol-POK as a polarizing agent. We could show qualitatively that the conformational space available to the protein backbone is different in different parts of the receptor and that a site in TM7 is sensitive to the nature of the ligand, whereas a site in ICL3 always showed large conformational freedom.
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Affiliation(s)
- Johanna Becker-Baldus
- Institute
of Biophysical Chemistry and Centre of Biomolecular Magnetic Resonance, Goethe University Frankfurt, Max-von-Laue-Str. 9, 60438 Frankfurt, Germany
| | - Alexei Yeliseev
- National
Institute on Alcohol Abuse and Alcoholism, National Institutes of
Health, Bethesda, Maryland 20852, United States
| | - Thomas T. Joseph
- Department
of Anesthesiology and Critical Care, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Snorri Th. Sigurdsson
- Department
of Chemistry, Science Institute, University
of Iceland, Dunhaga 3, 107 Reykjavik, Iceland
| | - Lioudmila Zoubak
- National
Institute on Alcohol Abuse and Alcoholism, National Institutes of
Health, Bethesda, Maryland 20852, United States
| | - Kirk Hines
- National
Institute on Alcohol Abuse and Alcoholism, National Institutes of
Health, Bethesda, Maryland 20852, United States
| | - Malliga R. Iyer
- Section
on Medicinal Chemistry, National Institute
on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, Maryland 20852, United States
| | - Arjen van den Berg
- ThermoFisher
Scientific, 7335 Executive
Way, Frederick, Maryland 21704, United States
| | - Sam Stepnowski
- ThermoFisher
Scientific, 7335 Executive
Way, Frederick, Maryland 21704, United States
| | - Jon Zmuda
- ThermoFisher
Scientific, 7335 Executive
Way, Frederick, Maryland 21704, United States
| | - Klaus Gawrisch
- National
Institute on Alcohol Abuse and Alcoholism, National Institutes of
Health, Bethesda, Maryland 20852, United States
| | - Clemens Glaubitz
- Institute
of Biophysical Chemistry and Centre of Biomolecular Magnetic Resonance, Goethe University Frankfurt, Max-von-Laue-Str. 9, 60438 Frankfurt, Germany
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