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Screening Methods for Cell-Free Synthesized GPCR/Nanoparticle Samples.

Zoe Köck1, Volker Dötsch1, Frank Bernhard2

  • 1Centre for Biomolecular Magnetic Resonance, Institute for Biophysical Chemistry, Goethe-University of Frankfurt/Main, Frankfurt/Main, Germany.

Methods in Molecular Biology (Clifton, N.J.)
|June 4, 2021
PubMed
Summary

Cell-free expression with nanodiscs enables rapid synthesis of membrane proteins like G-protein-coupled receptors (GPCRs). This method yields high-quality, functional GPCRs in lipid nanoparticles for drug screening and structural studies.

Keywords:
Cell-free protein expressionG-protein-coupled receptorsGPCR ligand screeningNanodiscsPreformed membranesSynthetic biology

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Biotechnology

Background:

  • Cell-free protein expression and lipid nanoparticles are key for membrane protein synthesis.
  • Preassembled nanodiscs facilitate co-translational insertion of membrane proteins into lipid bilayers without artificial compounds.

Purpose of the Study:

  • To present protocols for cell-free production of functional G-protein-coupled receptors (GPCRs) in nanodiscs.
  • To demonstrate applications in ligand screening and structural characterization.

Main Methods:

  • Utilizing cell-free expression systems with preassembled nanodiscs for co-translational insertion.
  • Implementing affinity tags for direct purification of GPCR/nanodisc particles from reaction mixtures.
  • Optimizing sample quality by adding chaperones or beneficial compounds.

Main Results:

  • Achieved functional folding of GPCRs with concentrations up to μM in cell-free reactions.
  • Demonstrated streamlined purification, reducing GPCR denaturation.
  • Showcased GPCRs in nanodiscs as effective tools for ligand screening and binding analysis.

Conclusions:

  • Cell-free expression in nanodiscs offers an efficient strategy for producing high-quality membrane proteins, particularly detergent-sensitive GPCRs.
  • This method facilitates downstream applications including high-throughput ligand screening and structural studies.
  • The protocols enable rapid generation and analysis of functionally folded GPCRs.