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Functional Reconstitution of Membrane Proteins Derived From Eukaryotic Cell-Free Systems
- Cell-free protein synthesis (CFPS) based on eukaryotic Sf21 lysate is gaining interest among researchers due to its ability to handle the synthesis of complex human membrane proteins (MPs). Additionally Sf21 cell-free systems contain endogenous microsomal vesicles originally derived from the endoplasmic reticulum (ER). After CFPS, MPs will be translocated into the microsomal vesicles membranes present in the lysates. Thus microsomal membranes offer a natural environment for de novo synthesized MPs. Despite the advantage of synthesizing complex MPs with post translational modifications directly into the microsomal membranes without any additional solubilization supplements, batch based Sf21 cell-free synthesis suffers from low yields. The bottleneck for MPs in particular after the synthesis and incorporation into the microsomal membranes is to analyze their functionality. Apart from low yields of the synthesized MPs with batch based cell-free synthesis, the challenges arise in the form of cytoskeleton elements and peripheral endogenousCell-free protein synthesis (CFPS) based on eukaryotic Sf21 lysate is gaining interest among researchers due to its ability to handle the synthesis of complex human membrane proteins (MPs). Additionally Sf21 cell-free systems contain endogenous microsomal vesicles originally derived from the endoplasmic reticulum (ER). After CFPS, MPs will be translocated into the microsomal vesicles membranes present in the lysates. Thus microsomal membranes offer a natural environment for de novo synthesized MPs. Despite the advantage of synthesizing complex MPs with post translational modifications directly into the microsomal membranes without any additional solubilization supplements, batch based Sf21 cell-free synthesis suffers from low yields. The bottleneck for MPs in particular after the synthesis and incorporation into the microsomal membranes is to analyze their functionality. Apart from low yields of the synthesized MPs with batch based cell-free synthesis, the challenges arise in the form of cytoskeleton elements and peripheral endogenous proteins surrounding the microsomes which may impede the functional analysis of the synthesized proteins. So careful sample processing after the synthesis is particularly important for developing the appropriate functional assays. Here we demonstrate how MPs (native and batch synthesized) from ER derived microsomes can be processed for functional analysis by electrophysiology and radioactive uptake assay methods. Treatment of the microsomal membranes either with a sucrose washing step in the case of human serotonin transporter (hSERT) and sarco/endoplasmic reticulum Ca2+/ATPase (SERCA) pump or with mild detergents followed by the preparation of proteoliposomes in the case of the human voltage dependent anionic channel (hVDAC1) helps to analyze the functional properties of MPs.…
Author details: | Srujan Kumar DondapatiORCiD, Henning Lübberding, Anne ZemellaGND, Lena ThoringGND, Doreen Anja Wüstenhagen, Stefan KubickORCiD |
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DOI: | https://doi.org/10.3389/fphar.2019.00917 |
ISSN: | 1663-9812 |
Pubmed ID: | https://pubmed.ncbi.nlm.nih.gov/31543813 |
Title of parent work (English): | Frontiers in pharmacology |
Publisher: | Frontiers Research Foundation |
Place of publishing: | Lausanne |
Publication type: | Article |
Language: | English |
Date of first publication: | 2019/08/30 |
Publication year: | 2019 |
Release date: | 2020/11/19 |
Tag: | Sf21 lysates; cell-free protein synthesis; ion channel; membrane proteins; microsomes; proteoliposomes; pump; transporter |
Volume: | 10 |
Number of pages: | 9 |
Funding institution: | European Regional Development Fund (EFRE)European Union (EU); German Ministry of Education and Research (BMBF)Federal Ministry of Education & Research (BMBF) [031B0078A] |
Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Biochemie und Biologie |
DDC classification: | 5 Naturwissenschaften und Mathematik / 57 Biowissenschaften; Biologie / 570 Biowissenschaften; Biologie |
Peer review: | Referiert |
Publishing method: | Open Access |
Open Access / Gold Open-Access | |
DOAJ gelistet |