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Hemifluorinated and fluorinated surfactants are lipophobic and, as such, non-detergent. Although they do not solubilize biological membranes, they can, after conventional solubilization, substitute for detergents to keep membrane proteins soluble, which generally improves their stability [Breyton, Chabaud, Chaudier, Pucci and Popot (2004) FEBS Lett. 564, 312-318]. In the present study, we show that (hemi)fluorinated surfactants can be used for in vitro synthesis of membrane proteins: they do not interfere with protein synthesis, and they provide a suitable environment for MscL, a pentameric mechanosensitive channel, to fold and oligomerize to its native functional state. Following synthesis, both types of surfactants can be used to deliver MscL directly to pre-formed lipid vesicles. The electrophysiological activity of MscL synthesized in vitro in the presence of either hemi- or per-fluorinated surfactant is similar to that of the protein expressed in vivo.

Fluorinated and hemifluorinated surfactants as alternatives to detergents for membrane protein cell-free synthesis