A Comprehensive Guide to Performing a Western Blot
Learn how to perform a Western blot with this detailed step-by-step guide. From preparing the gel to conducting antibody incubation, this article covers all the essential steps.
Video Summary
In a comprehensive video tutorial, the process of performing a Western blot to identify specific proteins in a sample is meticulously explained. The step-by-step guide begins with preparing the gel, a crucial stage in ensuring accurate results. By creating a blotting sandwich, the proteins are then transferred to a membrane for further analysis. Running the blot is a pivotal step in the process, allowing for the separation and identification of proteins. Subsequently, conducting antibody incubation plays a vital role in detecting the target proteins with precision. Finally, color development is carried out to visualize the results effectively. This detailed explanation provides a clear understanding of the intricate process involved in Western blotting, making it an invaluable resource for researchers and scientists alike.
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00:00:04
Introduction to Western Blot
The video provides a tutorial on how to perform a Western blot, a technique used to identify specific proteins in a sample, determining protein size, and relative abundance.
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00:00:20
Preparing the Gel
Fill a tray with blotting buffer to equilibrate the gel before starting the Western blot procedure.
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00:00:27
Gel Preparation
Remove the gel from the gel cassette using the opening key, aligning the arrows on the lever with those on the cassette to open it.
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00:00:54
Gel Trimming and Equilibration
Trim the top and bottom of the gel, then equilibrate it in the tray with blotting buffer for 15 minutes on a rocking platform.
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00:01:15
Creating a Blotting Sandwich
Prepare a container with blotting buffer, place the gel holder cassette in it, add fiber pads and blotting paper, then carefully place the gel on the paper.
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00:02:02
Adding Nitrocellulose Membrane
Wet a nitrocellulose membrane with blotting buffer, place it on top of the gel, and use a roller to remove air bubbles between the gel and the membrane.
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00:03:17
Assembling the Blotting Sandwich
Layer a second wet blotting paper and fiber pad on top of the membrane, fold the gel holder over the sandwich, and clamp it to squeeze the layers together.
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00:03:56
Preparing for Electrophoresis
Insert the gel holder into the electrophoresis chamber, ensuring correct alignment, add a cooling unit, fill the chamber with blotting buffer, and place the lid on the chamber.
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00:04:25
Electrophoresis Setup
Connect the electrical leads to the power supply with red to red and black to black connections before turning on the electrophoresis chamber.
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00:04:45
Setting up the Electrophoresis Chamber
To set up the electrophoresis chamber, run the blot at 20 volts for two and a half hours. After the run is complete, turn off the power supply, disassemble the chamber, and remove the inner module.
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00:05:14
Preparing the Membrane for Analysis
To prepare the membrane for analysis, open the module and place it in a container filled with blotting buffer with the black side down. Remove each layer starting from the first fiber pad until reaching the nitrocellulose membrane.
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00:05:40
Transferring Proteins to the Membrane
During the membrane preparation, note that the proteins have been successfully transferred from the gel to the membrane. The Kaleidoscope pre-stain standards are visible on both sides of the membrane, indicating a successful transfer.
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00:06:09
Blocking and Incubation Process
Immerse the membrane in 25 milliliters of blocking solution and incubate for 15 minutes at room temperature on a rocking platform. Subsequently, add 10 milliliters of primary antibody and incubate for 10 to 20 minutes on a faster setting to ensure constant coverage.
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00:07:25
Secondary Antibody Incubation
After rinsing the membrane in wash buffer, add 10 milliliters of secondary antibody and incubate for 5 to 15 minutes on a fast speed setting on the rocking platform. This step ensures proper binding of the secondary antibody.
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00:08:41
Final Wash and Color Development
For the final wash, add 50 milliliters of wash buffer and wash the membrane for three minutes on a medium speed setting. Subsequently, add substrate and incubate the membrane for 10 to 30 minutes, monitoring color development.
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00:09:35
Drying and Storage of the Membrane
Once the colors have developed, rinse the membrane twice with distilled water, blot dry with a paper towel, air dry for three to sixty minutes, and then cover in plastic wrap for storage. This ensures the preservation of the analyzed membrane.
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