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2 protocols using dipalmitoyl phosphatidylserine

1

Lipid Reagent Preparation and Characterization

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Dioleoyl phosphatidylcholine, dioleoyl phosphatidylserine, egg SM, dipalmitoyl phosphatidylserine, GM1, NBD‐PC, and Bodipy‐Chol were purchased from Avanti Polar Lipids. TR–DHPE, AF–CTxB, and OG–DHPE were purchased from Invitrogen. Other chemicals, including NaCl, CaCl2, MgCl2, 4‐(2‐Hydroxyethyl)piperazine‐1‐ethanesulfonic acid (HEPES), hexadecane, silicone oil AR 20, methyl‐β‐cyclodextrin, and SMase from Bacillus cereus were obtained from Sigma‐Aldrich. All the lipids were dissolved in chloroform or the mixture of chloroform and methanol, and stored in a refrigerator at −20 °C. NaCl, CaCl2, MgCl2, and HEPES were dissolved in distilled water at concentrations of 100 × 10−3, 5 × 10−3, 2 × 10−3, and 10 × 10−3m, respectively, to prepare an aqueous buffer solution, followed by titration to pH 7.4 with a 0.5 m NaOH solution. The aqueous buffer solution was stored in the refrigerator at 4 °C. AF–CTxB and SMase were dissolved in the aqueous buffer at concentrations of 50 µg mL−1 and 5 U mL−1, respectively, and they were stored in the refrigerator at 4 °C.
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2

Fluorescence Labeling of Bacterial Proteins

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aTC was from Spectrum Chemical Manufacturing Corp. [32P]PO4 was from PerkinElmer, MP Biomedicals, or American Radiolabeled Chemicals Inc. TNBS and DFDNB were purchased from Thermo Fisher Scientific and Sigma-Aldrich, respectively. MPB and AMS were purchased from Invitrogen Molecular Probes Biotechnology; n-OG and βME were purchased from Sigma-Aldrich. Carbonyl cyanide m-chlorophenyl hydrazine came from Sigma-Aldrich. E. coli polar lipid extract, E. coli CL, dipalmitoylphosphatidylethanolamine (DPPE), and dipalmitoylphosphatidylserine (DPPS) were purchased from Avanti Polar Lipids (Alabaster, AL). Streptavidin-conjugated Alexa Fluor 430, avidin–horseradish peroxidase, and SuperSignal West Pico chemiluminescent substrate came from Thermo Fisher Scientific. Aztreonam was obtained from Sigma-Aldrich. Biotinylated Ro09-0198 was a gift from M. Umeda (Kyoto University, Japan). Antibodies directed against SecA and PldA were gifts from K.-i. Nishiyama (Iwate University, Morioka, Japan) and J. Tommassen (Utrecht University, The Netherlands), respectively. NR12S and pyrene PA probes were gifts from A. Klymchenko (University of Strasbourg, France), O. Kucherak (Charles University, Prague), and Y. Niko (Kochi University, Japan).
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