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8 protocols using amersham ecl western blotting detection kit

1

Western Blot Analysis of LMP1 Expression

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Cells were extracted in lysis buffer (0.5% Nonidet P-40, 5% sodium deoxycholate, 50 µM NaCl, 10 µM Tris-HCl, pH 7.5, 1% bovine serum albumin) and centrifuged at 4°C and 18,407 × g for 15 min. The supernatant was mixed with 2X loading buffer and boiled for 5 min, and then the samples were separated via 10% SDS-PAGE gels and transferred to polyvinylidene difluoride membranes. The membranes were blocked with 5% fat-free milk at room temperature for 1 h, incubated at 4°C overnight with antibodies S12 for LMP1 (1:50), anti-β-actin (1:10,000; cat. no. A1978; Sigma-Aldrich; Merck KGaA, Darmstadt, Germany), anti-G protein (1:500; cat. no. 371818; Sigma-Aldrich; Merck KGaA) and anti-heterogeneous nuclear ribonucleoprotein A/B (1:500; cat. no. sc-376411; Santa Cruz Biotechnology, Inc., Dallas, TX, USA), washed, and then incubated with peroxidase-conjugated secondary antibody (1:2,000; cat. no. sc-11001; Santa Cruz Biotechnology, Inc.). Immune complexes were detected using an Amersham ECL Western Blotting Detection kit (Amersham Pharmacia Biotech, Little Chalfont, UK) and gel imaging analysis (Cool Imager; Viagene Biotech, Inc). To confirm the expression levels of each protein examined in LMP1-transfected cells, western blotting for each protein was performed in triplicate.
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2

Western Blot Analysis of SARS-CoV-2 Proteins

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The SARS-CoV-2-infected Vero E6 cells were lysed using the RIPA buffer supplemented with protease inhibitor (Merck Millipore, Billerica, MA, USA) and incubated at 100 °C for 5 min. A total of 15 μL of each sample was loaded into wells with the A YesBlot™ Western Marker I (10–200kDa) (WM1000 Smobio, Taiwan). Membranes were immunoreacted with IgYs against SARS-CoV-2 S protein subunits or glyceraldehyde 3-phosphate dehydrogenase (GAPDH) antibodies (GeneTex, Cat# GTX627408, 1:5000). Reactive bands were visualized by Amersham ECL Western Blotting Detection Kit (Amersham)
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3

Antibody Validation for Western Blotting

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The following antibodies were used in the western blot experiments: ANXA13, rabbit polyclonal (ab105802, Abcam, USA; the specificity of this antibody was further verify by a second ANXA13 antibody: goat polyclonal, AF4149-SP, R&D System, USA); β-actin, mouse monoclonal (clone AC-74, A2228, Sigma); MMP9, rabbit polyclonal (ab38898, Abcam); Phospho-Akt (Thr308) (244F9), Rabbit mAb #4056 (Cell Signaling Technology). Protein lysates were prepared from cultured cells in ice-cold Tris buffer (20 mmol/L; pH 7.5) containing NaCl (137 mmol/L), EDTA (2 mmol/L), Triton X (1%), glycerol (10%), NaF (50 mmol/L), DTT (1 mmol/L), and a protease inhibitor cocktail (P8340, Sigma, USA). After electrophoresis (SDS-PAGE), protein samples were transferred onto Hybond-P membranes (Amersham Biosciences). The blot was blocked in TBS with 5% nonfat milk and 0.1% Tween 20, followed by incubation with primary antibody (RT 1h) and HRP-tagged goat anti-rabbit or -mouse IgG secondary antibody (sc-2030 or sc-2357, Santa Cruz, USA). The blots were visualized and quantitated using Amersham ECL Western Blotting Detection Kit (Amersham Biosciences).
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4

SARS-CoV-2 Spike and Nucleocapsid Protein Detection

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The protein lysates of SARS-CoV-2-infected cells were dissolved with RIPA buffer. The protein expression was analyzed by Western blot analysis in which the TGN Gel 4–15% (QP5510, SMOBIO) with an SE260 Mighty Small II Deluxe Mini Vertical Protein Electrophoresis Unit (Hoefer, Inc., Holliston, MA, USA) was used. A YesBlot™ Western Marker I (10–200 kDa) (WM1000 Smobio, Taiwan) was used as a molecular weight marker. Antibodies including the mouse monoclonal anti-spike (1:5000; GeneTex Cat #GTX632604) and mouse monoclonal anti-nucleocapsid (1:2000; GeneTex Cat# GTX632269) antibodies were used to detect the SARS-CoV-2 spike and nucleocapsid proteins, respectively. The mouse monoclonal GAPDH antibody (GTX627408, GeneTex, 1:5000) was used as the loading control. The anti-chicken IgY (IgG) (whole molecule)–peroxidase antibody produced in rabbits (Sigma-Aldrich A9046) and the anti-rabbit IgG (whole molecule)–peroxidase antibody produced in goats (Sigma-Aldrich A0545) were used as the secondary antibodies as required. The luminol-based detection of Western blot signals was performed using the Amersham ECL Western Blotting Detection Kit (Amersham Biosciences, Buckinghamshire, UK). The images were captured and analyzed using Image Quant™ LAS 4000 (GE Healthcare, Chicago, IL, USA).
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5

Western Blot Analysis of Pbp2c Protein

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Proteins from crude extracts (10 μg) were separated on 15% SDS-PAGE, transferred to a nitrocellulose membrane (Hybond, Amersham Biosciences, Little Chalfont, United Kingdom), and incubated with mouse anti-Pbp2c antiserum (1/5,000). Nitrocellulose membranes were incubated in 10 mM Tris-Cl buffer pH 7.5 containing 150 mM NaCl, 0.025% Tween 20, and 2.5% nonfat dry milk for 1 h at 4°C. Peroxidase-conjugated goat anti-mouse antibodies (Life Technologies, Saint-Aubin, France; 1/6,000) were used as secondary antibodies. Pbp2c-antibodies complexes were detected by chemiluminescence (Amersham ECL Western Blotting Detection Kit, Cytiva) using a film exposure time of 5 min. Purified His-tagged-Pbp2c (3 ng) was used as the positive control.
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6

RNA Labeling and Detection Assay

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After treatment with EZ-Link HPDP-Biotin (Thermo Scientific), 500 ng of heat denatured (for 10 minutes at 65°C) total RNA were spotted on an Amersham Hybond-N+ positively charged nylon membrane (Cytiva). The RNA was ultraviolet-cross-linked to the membrane with Spectrolinker XL-1500 (Spectroline, ‘optimal crosslink’) and blocked for 10 minutes in blocking solution (PBS pH 7.5, 10% SDS, 1 mM EDTA). The membrane was then incubated in 1:1000 dilution of streptavidin-HRP (Pierce) in blocking buffer for 15 minutes. After washings with decreased concentration of SDS, the signal was recorded (Amersham ECL Western Blotting Detection Kit, Cytiva).
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7

Western Blot Analysis of Protein Targets

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Total cell protein was prepared using RIPA Lysis Buffer (Beyotime Institute of Biotechnology). Protein was measured using a BCA protein Assay Kit (CWBIO). Proteins were resolved by sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) and transferred onto PVDF membranes using a Bio-Rad Mini PROTEAN 3 system (Bio-Rad Laboratories, Inc.). The membranes were blocked with PBS containing 5% milk and 0.1% Tween-20 at room temperature for 1 h. The primary antibodies were as follows: β-actin (mouse monoclonal, dilution 1:10,000; A4551) was from Sigma-Aldrich; Merck KGaA. Lamin A (mouse monoclonal, dilution 1:1,000; sc-71481) was obtained from Santa Cruz Biotechnology, Inc. Anti-NF-κB p65 (rabbit polyclonal, dilution 1:1,000; ab16502), anti-Histone H3 acetyl K9 (rabbit polyclonal, dilution 1:5,000, ab4441), anti-HDAC1(rabbit polyclonal, dilution 1:5,000, ab109411) and anti-IκB-α (rabbit polyclonal, dilution 1:5,000, ab32518) were purchased from Abcam. Horseradish peroxidase-conjugated anti-mouse (1:2,500 dilution) or anti-rabbit (1:2,500 dilution) secondary antibodies were purchased from Bioworld Technology, Inc. Immunoreactive bands were visualized by using the Amersham ECL Western Blotting Detection Kit (Cytiva) according to the manufacturer's instructions. β-actin served as a loading control (19 (link),23 (link)).
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8

RNA Labeling and Detection Assay

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After treatment with EZ-Link HPDP-Biotin (Thermo Scientific), 500 ng of heat denatured (for 10 minutes at 65°C) total RNA were spotted on an Amersham Hybond-N+ positively charged nylon membrane (Cytiva). The RNA was ultraviolet-cross-linked to the membrane with Spectrolinker XL-1500 (Spectroline, ‘optimal crosslink’) and blocked for 10 minutes in blocking solution (PBS pH 7.5, 10% SDS, 1 mM EDTA). The membrane was then incubated in 1:1000 dilution of streptavidin-HRP (Pierce) in blocking buffer for 15 minutes. After washings with decreased concentration of SDS, the signal was recorded (Amersham ECL Western Blotting Detection Kit, Cytiva).
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