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2 protocols using 5 6 carboxyfluorescein

1

Fluorescent Hydrogel Synthesis Protocol

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Acrylamide (AAm), N-hydroxysuccinamide, 4’Aminofluorescein isomer I, 5(6)-Carboxyfluorescein, Fluorescein disodium salt, FITC, 3-(trimethoxysilyl) propyl methacrylate and Ethylene glycol were purchased from Acros Organics. Pyruvic acid and 3-aminopropyl methacrylamide hydrochloride (3AP) were purchased from Sigma-Aldrich. Tetramethylethylenediamine (TEMED) was purchased from ThermoScientific. Ammonium persulfate (APS) was purchased from Aqua Solutions. Polyethylene(glycol) diacrylate (PEGDA; Mw = 400) was purchased from PolySciences Inc. 1-Ethyl-3-(3-dimethylaminopropyl)-carbodiimide (EDC) was purchased from Advanced Chemtec. Hydrochloric acid (37.5%) and glycine were purchased from Fisher Scientific. Glass microscope slides (3” × 1” × 1.2 mm) were purchased from Fisherbrand. Ethanol (EtOH) was purchased from Decon Laboratories Inc. Water (dd-H2O) was deionized using Milli-Q Advantage A-10 water purification system (Millipore, U.S.A.). When required, degassing was performed by sparging with a continuous argon stream for 15 min for small volumes and 2 h for large volumes. Coverglass slips (Thickness #1, Diameter 25mm) were purchased from Electron Microscopy Sciences. Rain-X hydrophobic spray manufactured by ITW (Global Bands, TX) was purchased from Home Depot.
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2

Peptide Synthesis and Purification

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Peptides DEIVNKVL (Vps2 residues 165–172) and DEIVNKVLDEIGVDLNSQLQ (Vps2 residues 165–184) were prepared by solid-phase synthesis on a Prelude X peptide synthesizer (Protein Technologies, Inc., Tucson, AZ) using standard procedures and Fmoc chemistry (Chan and White, 2000 ). Unlabeled peptides were N-terminally acetylated and C-termini were produced as carboxyamides. For peptides used in fluorescence polarization assays, 5 (6)-carboxyfluorescein (Acros Organics, Geel, Belgium) was coupled to the N-terminal α-amine by standard coupling conditions. Following cleavage from resin by TFA, the peptides were precipitated with ice-cold ether, washed thoroughly with ether, and dried overnight under vacuum. Peptides were then HPLC purified on a Phenomenex 5 µm-C4 Jupiter column (10 × 250 mm, 300 Å) at 5 ml/min over a 15 min gradient (20–80% ACN,0.1% TFA). Peptide quality was verified by LC-MS using a FortisBIO 5 µm C4 column (4.6 × 150 mm, 300 Å) coupled to an Agilent 6100 Series Single Quadrupole mass spectrometer.
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