A diglucosylated fluorinated surfactant to handle integral membrane proteins in aqueous solution

The use of fluorinated surfactants as efficient tools for handling membrane proteins in aqueous media was demonstrated many years ago. The work reported herein deals with the synthesis of a new sugar-based surfactant bearing two glucose moieties and labelled F-6-DigluM. The synthesis of F-6-DigluM is based on a one-pot reduction/alkylation of a fluorinated thioacetate onto an acrylamido-type polar head precursor, using NaBH4 in refluxing methanol. Its physical-chemical properties in aqueous solution were studied by surface tension measurement, dynamic light scattering and analytical ultracentrifugation. F-6-DigluM exhibits a critical micellar concentration of similar to 0.4 mM and self-assembles into small and well-defined aggregates, very likely to globular micelles. Finally, the homogeneity and the stability of complexes of bacteriorhodopsin and F-6-DigluM over time were observed, demonstrating that F-6-DigluM is a suitable tool for biochemical applications. (C) 2011 Elsevier B.V. All rights reserved.