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Precision plus protein ladder

Manufactured by Bio-Rad

The Precision Plus Protein Ladder is a pre-stained molecular weight standard used for the identification and estimation of protein molecular weights in SDS-PAGE. It consists of 10 recombinant proteins, ranging from 10 to 250 kDa, that are covalently coupled to a blue or orange dye.

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7 protocols using precision plus protein ladder

1

Protein Sample Preparation and Analysis

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Protein samples were prepared for analysis by adding water, NuPage Reducing Agent (10×) (Invitrogen, Carlsbad, CA), and NuPage LDS Buffer (4×) (Invitrogen) for a total of 10 μL per well. Non-reduced samples were prepared similarly, substituting 1 μL of water for the reducing agent. Each sample was put into a NuPage™ 4–12% Bis-Tris PAGE gel (Invitrogen) along with a PrecisionPlus™ protein ladder (Biorad, Hercules, CA). Gels were run in MES buffer (Invitrogen). After electrophoresis, gels were rinsed three times with 18 MΩ water for 5 min each. Gels were then treated with SimplyBlue™ Safestain (Invitrogen) for at least one hour, and then rinsed with water overnight. Images of stained gels were taken using a Chemidoc Touch Imager (BioRad). Densitometry measurements were performed using ImageLab software (BioRad). Densitometry readings of >96% were considered to be pure enough to proceed with animal trials.
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2

Comparative Analysis of dECM Composition

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SDS-PAGE was used to compare the compositions of the dECMs. Protein extracts were prepared using the Pierce Protein Assay Kit according to manufacturer instructions and resuspended in 7.5 μL XT sample buffer/1.5 μL XT reducing agent (Bio-Rad), placed in a 95°C heating block for 10 min, and centrifuged for 2 min at 14,000 g. Samples were loaded into 1.0 mm 4–12% gradient Bis-Tris Criterion XT Precast Gel (Bio-Rad), with collagen I (Sigma Aldrich) and Precision Plus protein ladder (Bio-Rad) used as controls. Loaded gels were placed into XT MOPS buffer (Bio-Rad) and electrophoresed at 150 V for ~100 min. Gels were then stained with BioSafe Coomassie (Bio-Rad) for at least 2 h and washed with deionized water three times for 5 min each. Bands were visualized using a GE Image Scanner III, with images taken using ImageQuant TL software (GE Healthcare).
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3

Reagents and Antibodies for Protein Analysis

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Unless otherwise noted, all chemicals were purchased from Sigma/Aldrich Chemical Co (St. Louis, MO & Milwaukee, WI). DNA extraction solvents were from Life Technologies (Grand Island, NY). Criterion polyacrylamide gels and Precision Plus protein ladder were purchased from BioRad Laboratories (Richmond, CA). PVDF membrane and ECL Plus chemiluminescent substrate were from GE Healthcare (Piscataway, NJ). Pierce® ECL 2 Western Blotting Substrate was from Thermo Scientific (Rockford, IL). Sodium phenylbutyrate (PBA) was from Enzo Life Sciences. Saturated phenol and phenol/chloroform/isoamyl alcohol were from Life Technologies (Grand Island, NY). The synthesis of 2-succinocysteamine (2SCEA) and preparation of polyclonal anti-2SC antibody has been described previously (Nagai 2007).
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4

Antibody and Tubulin Detection Protocol

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Unless otherwise noted, all chemicals were purchased from Sigma/Aldrich Chemical Co (St. Louis, MO & Milwaukee, WI). Criterion polyacrylamide gels and Precision Plus protein ladder were purchased from BioRad Laboratories (Richmond, CA). PVDF membrane and ECL Plus chemiluminescent substrate were from GE Healthcare (Piscataway, NJ). The synthesis of 2-succinocysteamine and preparation of polyclonal anti-2SC antibody has been described previously [2 (link)]. The following commercial antibodies were used: α-tubulin B-7 from Santa Cruz Biotechnology (Dallas, TX) and DM1A from Cell Signaling Technology, Inc. (Danvers, MA); β-tubulin TUB2.1 from Santa Cruz Biotechnology and D65A4 from Cell Signaling Technology, Inc.; combined αβ-tubulin ATN02 from Cytoskeleton, Inc. (Denver, CO); and actin I-19 from Santa Cruz Biotechnology.
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5

SDS-PAGE Protein Characterization

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For initial protein characterization, an SDS-Polyacrylamide gel (SDS-PAGE) was generated using the Laemmli protocol. Briefly, 120 μg of each OPI solution was diluted in 50 μL of water and mixed with 10 μL of 6x Laemmli reducing buffer (ThermoFisher #J61337-AC). Solutions were heated to 95°C for 10 minutes, centrifuged at 13,000 g for 5 minutes, and 10 μL of solution was loaded into a 4–20% Tris-glycine gel (ThermoFisher #XP04200PK2) along with 3 μL of Precision Plus protein ladder (Bio-Rad #1610374), and gels were run at 125 V for 1.25 hours in Tris-Glycine running buffer (ThermoFisher #LC2675).
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6

Western Blot Analysis of hGN Lysates

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hGN lysates were collected and boiled for 3 minutes in SDS sample buffer, resolved by SDS PAGE using 8–10% polyacrylamide gels and Precision Plus protein ladder (Biorad). Samples were then transferred to nitrocellulose and immunoblotted using primary antibodies (see antibodies above) at 1:1000 dilution, and then secondary 800nm DyLight-conjugated antibodies (Rockland Immunochemical 75934-472) at 1:50,000 dilution, prior to visualization and quantification with a Licor Odessy system. Original blot images provided as Supplementary Information.
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7

Western Blot Analysis of hGN Lysates

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hGN lysates were collected and boiled for 3 minutes in SDS sample buffer, resolved by SDS PAGE using 8–10% polyacrylamide gels and Precision Plus protein ladder (Biorad). Samples were then transferred to nitrocellulose and immunoblotted using primary antibodies (see antibodies above) at 1:1000 dilution, and then secondary 800nm DyLight-conjugated antibodies (Rockland Immunochemical 75934-472) at 1:50,000 dilution, prior to visualization and quantification with a Licor Odessy system. Original blot images provided as Supplementary Information.
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