Cell-free production of G protein-coupled receptors for functional and structural studies

Klammt, C. and Schwarz, D. and Eifler, N. and Engel, A. and Piehler, J. and Haase, W. and Hahn, S. and Dotsch, V. and Bernhard, F.. (2007) Cell-free production of G protein-coupled receptors for functional and structural studies. Journal of structural biology, Vol. 158, H. 3. pp. 482-493.

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Official URL: http://edoc.unibas.ch/dok/A5262432

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G-protein coupled receptors (GPCRs) are key elements in signal transduction pathways of eukaryotic cells and they play central roles in many human diseases. So far, most structural and functional approaches have been limited by the immense difficulties in the production of sufficient amounts of protein samples in conventional expression systems based on living cells. We report the high level production of six different GPCRs in an individual cell-free expression system based on Escherichia coli extracts. The open nature of cell-free systems allows the addition of detergents in order to provide an artificial hydrophobic environment for the reaction. This strategy defines a completely new technique for the production of membrane proteins that can directly associate with detergent micelles upon translation. We demonstrate the efficient overproduction of the human melatonin 1B receptor, the human endothelin B receptor, the human and porcine vasopressin type 2 receptors, the human neuropeptide Y4 receptor and the rat corticotropin releasing factor receptor by cell-free expression. In all cases, the long chain polyoxyethylene detergent Brij78 was found to be highly effective for solubilization and milligram amounts of soluble protein could be generated in less than 24 h. Single particle analysis indicated a homogenous distribution of predominantly protein dimers of the cell-free expressed GPCR samples, with dimensions similar to the related rhodopsin. Ligand interaction studies with the endothelin B receptor and a derivative of its peptide ligand ET-1 gave further evidence of a functional folding of the cell-free produced protein.
Faculties and Departments:05 Faculty of Science > Departement Biozentrum > Former Organization Units Biozentrum > Structural Biology (Engel)
UniBasel Contributors:Engel, Andreas H
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Academic Press
Note:Publication type according to Uni Basel Research Database: Journal article
Last Modified:22 Mar 2012 14:22
Deposited On:22 Mar 2012 13:30

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