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Coat components localize to specific membrane domains, where they sort selected transmembrane proteins. To study how clathrin coats are stabilized on such domains and to identify the protein networks involved, we combined proteomic screens and in vitro liposome-based assays that recapitulate the fidelity of protein sorting in vivo. Our study identifying… (More)
In eukaryotic cells, nanotubes represent a substantial fraction of transport intermediates between organelles. They are extracted from membranes by molecular motors walking along microtubules. We previously showed that kinesins fixed on giant unilamellar vesicles in contact with microtubules are sufficient to form nanotubes in vitro. Motors were attached to… (More)
In route to a physical study aimed at understanding lipids and proteins sorting in cells, we designed a rhodamin-labelled biotinylated phosphatidylethanolamine (PE), as a useful and easy-attainable lipid double probe. The target compound was successfully engaged in preliminary physical experiments.
Unilamellar liposomes are conventionally prepared by rapid injection of an ethanolic solution of lipids into an aqueous medium. The aim of the present study was to control, more efficiently, vesicle diameter by using an alternative solvent. The results show that isopropanol injection is a good alternative to ethanol injection for the manufacture of… (More)
Key cellular processes such as cell division, membrane compartmentalization, and intracellular transport rely on motor proteins. Motors have been studied in detail on the single motor level such that information on their step size, stall force, average run length, and processivity are well known. However, in vivo, motors often work together, so that the… (More)
The marine natural product kahalalide A, a cyclic depsipeptide, was prepared by total synthesis on solid-phase. A backbone cyclization strategy was followed, using the Kenner sulfonamide safety-catch linker. By NMR comparison of synthetic and naturally isolated material, the stereochemistry of the methylbutyrate side chain was established as (S). Several… (More)
As part of a drug delivery project, four aldehydes of the type Pam-Lys(Pam)-spacer-CO-CHO were synthesized to be included in targeting colloids. Though amphiphilic, they were obtained within reasonable yields (18-55%) and with high RP-HPLC purity ( approximately 90%). Parallely, six complementary targeting peptides of the type… (More)
Hydrophobic photoaffinity labeling is a powerful strategy to identify hydrophobic segments within molecules, in particular membrane proteins. Here we report the design and synthesis of a novel family of fluorescent and photosensitive lipid tools, which have a common amino acid scaffold functionalized by three groups: (i) a first fatty acid chain grafted… (More)
Four novel water-soluble lipid immunoadjuvants were designed, synthesized and characterized by MS and NMR. They all induce mouse dendritic cell maturation and B cell proliferation. We demonstrate that in spite of the chemical modification, the four compounds remain TLR2 agonists.
New mild and specific chemical strategies have been developed recently for the selective coupling of biological macromolecules. Among them, the hydrazone ligation strategy offers high chemoselectivity and versatility. We intended to use hydrazone ligation to target the controlled release of therapeutic agents by biological vectors (multilamellar vesicles… (More)