Abstract
Membrane proteins (MPs) are of central interest for the pharmaceutical industry but their production is usually a challenging task. The complex folding mechanisms of newly synthesized MPs often require interactions with specific compounds for improved stability. Conditions for the production of high‐quality samples are therefore difficult to predict and frequently cannot be provided in conventional protein expression platforms. Cell‐free (CF) biosynthetic systems allow, in contrast to living cells, nonrestricted access to the protein production machinery. Reaction conditions can be adjusted according to particular requirements and modified by supplementing single additives or even cocktails of compounds. These options have initiated completely new research fields for the cotranslational stabilization and folding of MPs in artificial environments. Based on established and efficient CF production protocols, a recent focus was to explore and define suitable supplements for CF expression reactions that are useful for the generation of high‐quality MP samples. Besides classical detergents and lipids, a variety of new compounds with interesting properties have been discovered and synthesized. We compile the currently available toolbox for MP solubilization in CF systems and summarize new developments and perspectives for the directed modulation of CF biosynthetic environments.
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