Western Blot
Western Blot - Related Videos
08:48
The Western Blot
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2023
Western Blotting is used to identify the presence of specific proteins in electrophoretically separated samples. Following separation by a technique known as sodium dodecyl sulfate polyacrylamide gel electrophoresis, or SDS-PAGE, western transfer is used to move proteins from a polyacrylamide gel onto a piece of membrane which traps the proteins in their respective locations. Next, the membranes are probed with antibodies in a process called immunboblotting. Immunoblotting uses...
07:45
Western Blotting: Sample Preparation to Detection
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Cited by 49 •
2010
Western blotting is an analytical technique used to detect specific proteins in a given sample of tissue homogenate or extract.
01:15
Western Blotting
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2023
Western blotting is an analytical technique for protein identification. It has various applications in immunology and medicine, including detecting diseases like bovine spongiform encephalopathy, mad cow disease, and human and feline immunodeficiency virus from biological samples. The technique begins with separating proteins from the sample using sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE), followed by protein transfer, immunoblotting, and finally, protein detection.
11:43
The Fastest Western in Town: A Contemporary Twist on the Classic Western Blot Analysis
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Cited by 30 •
2014
This protocol explores the latest advancements in performing Western blot analyses. These novel modifications employ a Bis-Tris gel system with a 35 min electrophoresis run time, a 7 min dry blotting transfer system, and infrared fluorescent protein detection and imaging that generates higher resolution, quality, sensitivity, and improved accuracy of Western data.
03:35
Chemiluminescent Western Blot Assay for Protein Processing
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2025
This video describes the chemiluminescence-based western blotting of immunoprecipitated lysates. The technique helps determine protein processing and activation. The chemiluminescent signal detected is proportional to the level of protein processing during its activation.
FAQs
Denaturation changes the proteins’ structure before electrophoresis, allowing the sample’s proteins to enter polyacrylamide gel electrophoresis in a form suitable for separation by size. This preparation matters because the later band position is interpreted in relation to molecular weight. Without consistent preparation, differences in protein structure could complicate comparisons of migration between samples.
Polyacrylamide gel electrophoresis separates denatured proteins according to their size, so the later membrane pattern contains positional information as well as antibody-derived specificity. A target band’s apparent molecular weight can therefore be compared with the expected or observed position of proteins in the sample. This makes the method useful for verifying whether a detected signal corresponds to the protein under investigation.
The primary antibody supplies target recognition, while the labeled secondary antibody converts that recognition into a measurable signal. Keeping these roles distinct combines molecular specificity with signal generation: the primary antibody identifies the protein of interest, and the secondary antibody enables its detection after transfer to the membrane. This arrangement supports selective analysis of one protein within a complex biological sample.
Transfer places the size-separated proteins onto a membrane where antibody-based detection can occur. The membrane therefore links the physical separation step with molecular identification: position preserves information related to protein size, while antibody recognition selects the target. In practice, successful transfer is essential for connecting a visible or measurable signal to the protein’s electrophoretic position.
Researchers compare the measured signal associated with the same target protein across biological samples to estimate relative abundance. Because the protein first separates by size and is then identified with an antibody, the comparison is tied to a defined molecular species rather than to total sample content. This helps evaluate protein expression and regulation in cellular or biological experiments.
It is especially useful when a biological question requires protein-level evidence rather than gene-expression information alone. Applications described for the method include investigating signaling pathways, disease mechanisms, and cellular responses, as well as verifying gene-expression results. Its compatibility with diverse sample types broadens its use across molecular and cellular biology, where researchers need to examine specific proteins in complex samples.