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Application
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Immunoprecipitation (IP)
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Application Notes
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Immunoprecipitation 1) Prepare two tubes with 50 µ l of culture supernatant of CHO tra nsfectant cells which secretes human LECT2. 2) Add 450 µ l of Extraction Buffer (50 mM HEPES (pH 7.3), 250 mM NaCl, 0.2% NP-40, 5 mM EDTA, 10% glycerol, 2 mM benzamidine, 2 µ g/ml leupeptin, 2 µ g/ml pepstatin A) to each tubes. 3) Add 2 µ g of anti-LECT2 monoclonal antibody to one tube. To the other tube, add 2 µ g of normal mouse IgG as the control. Incubate them by gentle mixing for 30 minutes at 4 o C. 4) Add 20 µ l of protein A sepharose (50% suspension) and incubate them by gentle mixing for 1 hour at 4 o C. 5) After brief centrifuging at 12,000 rpm, remove the supernatant. Add High Salt Buffer (Extraction Buffer containing 0.5 M NaCl) and tap the tube. Repeat this step four times. 6) After adding 20 µ l of SDS-PAGE sample buffer (2ME+), boil them for 3 minutes. After brief centrifuging at 10,000 rpm, resolve 10 µl/lane of the sample by 15% SDS-polyacrylamide gel electrophoresis. (See the manufacture's manual for electrophoresis condition). 7) Blot the protein to a polyvinylidene difluoride (PVDF) membrane at 1 mA/cm 2 for 1 hour in a semi -dry transfer system. (Transfer Buffer - 25 mM Tris, 190 mM glycine, 20% methanol). See the manufacture's manual for precise transfer procedure. 8) To reduce nonspecific binding, soak the membrane in Block Ace TM (Snow bland) for 1 hour at room temperature, or overnight at 4 o C. 9) Dilute the anti-LECT2 monoclonal antibody to 1 µg/ml with Dilution Buffer (10% Block Ace TM /PBS). Incubate the membrane with primary antibody dilution for 1 hour at room temperature. 10) Wash the membrane with Washing Buffer (0.2% Tween 20 in PBS) for 10 minutes x 3 times. 11) Incubate the membrane with secondary antibody (1:10,000 diluted horseradish peroxidase conjugated anti Mouse IgG (H+L) goat antibody in Dilution Buffer) for 1 hour at room temperature. 12) Wash the membrane for 10 minutes x 3 times with Washing Buffer. 13) Wipe excess buffer on the membrane, then incubate it with appropriate chemiluminescence reagent for 1 minute. Remove extra reagent from the membrane by dabbing with paper towel, and seal it in plastic wrap. 14) Expose to a X-ray film in a dark room for 30 seconds. Develop the film as usual. The condition for exposure and development may vary. Patent Pending Immunoprecipitation: 2 µ g / 500 µ l of reaction solution Research Applications.
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Restrictions
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For Research Use Only
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