G-protein-coupled receptor solubilization and purification for biophysical analysis and functional studies, in the total absence of detergent

Mohammed Jamshad, Jack Charlton, Yu-Pin Lin, Sarah J Routledge, Zharain Bawa, Timothy J. Knowles, Michael Overduin, Niek Dekker, Tim R. Dafforn, Roslyn M. Bill, David R. Poyner, Mark Wheatley

Research output: Contribution to journalArticle

Abstract

G-protein coupled receptors (GPCRs) constitute the largest class of membrane proteins and are a major drug target. A serious obstacle to studying GPCR structure/function characteristics is the requirement to extract the receptors from their native environment in the plasma membrane, coupled with the inherent instability of GPCRs in the detergents required for their solubilization. In the present study, we report the first solubilization and purification of a functional GPCR [human adenosine A<inf>2A</inf> receptor (A<inf>2A</inf>R)], in the total absence of detergent at any stage, by exploiting spontaneous encapsulation by styrene maleic acid (SMA) co-polymer direct from the membrane into a nanoscale SMA lipid particle (SMALP). Furthermore, the A<inf>2A</inf>R-SMALP, generated from yeast (Pichia pastoris) or mammalian cells, exhibited increased thermostability (∼5°C) compared with detergent [DDM (n-dodecyl-β-D-maltopyranoside)]-solubilized A<inf>2A</inf>R controls. The A<inf>2A</inf>R-SMALP was also stable when stored for prolonged periods at 4°C and was resistant to multiple freeze-thaw cycles, in marked contrast with the detergent-solubilized receptor. These properties establish the potential for using GPCR-SMALP in receptor-based drug discovery assays. Moreover, in contrast with nanodiscs stabilized by scaffold proteins, the non-proteinaceous nature of the SMA polymer allowed unobscured biophysical characterization of the embedded receptor. Consequently, CD spectroscopy was used to relate changes in secondary structure to loss of ligand binding ([<sup>3</sup>H]ZM241385) capability. SMALP-solubilization of GPCRs, retaining the annular lipid environment, will enable a wide range of therapeutic targets to be prepared in native-like state to aid drug discovery and understanding of GPCR molecular mechanisms.

LanguageEnglish
Article numbere00188
Number of pages10
JournalBioscience Reports
Volume35
Issue number2
DOIs
Publication statusPublished - 27 Feb 2015

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G-Protein-Coupled Receptors
Detergents
Purification
Lipids
Styrene
Drug Discovery
Adenosine A2A Receptors
Pichia
Cell membranes
Encapsulation
Scaffolds
Yeast
Assays
Spectrum Analysis
Polymers
Membrane Proteins
Yeasts
Cells
Cell Membrane
Spectroscopy

Bibliographical note

©2015 The Author(s) This is an Open Access article distributed under the terms of the Creative Commons Attribution Licence (CC-BY) (http://creativecommons.org/licenses/by/3.0/) which permits unrestricted use, distribution and reproduction in any medium, provided the original work is properly cited.

Funding: BBSRC (BB/I020349/1; BB/I019960/1; BB/J010812/1; BB/J017310/1; and MRC/Astra Zeneca (G1001610).

Keywords

  • adenosine receptor
  • detergent-free
  • g-protein coupled receptor (GPCR)
  • protein thermostability
  • structure

Cite this

Jamshad, Mohammed ; Charlton, Jack ; Lin, Yu-Pin ; Routledge, Sarah J ; Bawa, Zharain ; Knowles, Timothy J. ; Overduin, Michael ; Dekker, Niek ; Dafforn, Tim R. ; Bill, Roslyn M. ; Poyner, David R. ; Wheatley, Mark. / G-protein-coupled receptor solubilization and purification for biophysical analysis and functional studies, in the total absence of detergent. In: Bioscience Reports. 2015 ; Vol. 35, No. 2.
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G-protein-coupled receptor solubilization and purification for biophysical analysis and functional studies, in the total absence of detergent. / Jamshad, Mohammed; Charlton, Jack; Lin, Yu-Pin; Routledge, Sarah J; Bawa, Zharain; Knowles, Timothy J.; Overduin, Michael; Dekker, Niek; Dafforn, Tim R.; Bill, Roslyn M.; Poyner, David R.; Wheatley, Mark.

In: Bioscience Reports, Vol. 35, No. 2, e00188, 27.02.2015.

Research output: Contribution to journalArticle

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AU - Charlton, Jack

AU - Lin, Yu-Pin

AU - Routledge, Sarah J

AU - Bawa, Zharain

AU - Knowles, Timothy J.

AU - Overduin, Michael

AU - Dekker, Niek

AU - Dafforn, Tim R.

AU - Bill, Roslyn M.

AU - Poyner, David R.

AU - Wheatley, Mark

N1 - ©2015 The Author(s) This is an Open Access article distributed under the terms of the Creative Commons Attribution Licence (CC-BY) (http://creativecommons.org/licenses/by/3.0/) which permits unrestricted use, distribution and reproduction in any medium, provided the original work is properly cited. Funding: BBSRC (BB/I020349/1; BB/I019960/1; BB/J010812/1; BB/J017310/1; and MRC/Astra Zeneca (G1001610).

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