Western Immunoblotting
Western Immunoblotting - 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...
16:01
Immunoblot Analysis
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Cited by 21 •
2008
Immunoblotting (western blotting) is a rapid and sensitive assay for the detection and characterization of proteins that works by exploiting the specificity inherent in antigen-antibody recognition. This video provides protocols for protein separation, blotting proteins onto membranes, immunoprobing, and visualization using chromogenic or chemiluminescent substrates.
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.
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.
09:32
Optimized Analysis of Proteins from Xenopus Oocytes and Embryos by Immunoblotting
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2025
This article describes a protocol for analyzing proteins from Xenopus oocytes and embryos by immunoblotting. Collection steps are described, followed by steps corresponding to sample processing, SDS-PAGE, transfer, antibody staining, and imaging. The protocol emphasizes studying translational regulatory protein complexes with endogenous antibodies and antibodies against protein affinity tags.
FAQs
Protein size provides an interpretive reference for the antibody-generated signal. After electrophoretic separation, the position of a detected target can be considered alongside its apparent molecular size, helping researchers distinguish molecular changes between samples. In infection and immune-response studies, this size information strengthens assessment of whether detected proteins correspond to pathogen antigens or host signaling proteins.
The primary antibody supplies target recognition, while the labeled secondary antibody produces the measurable signal used for detection. This division connects molecular specificity with signal generation: the primary antibody determines which protein is recognized, and the secondary antibody enables that recognition to be observed. Antibody specificity therefore directly affects how confidently researchers interpret target presence.
Differences in signal between biological conditions can indicate changes in the relative abundance of a target protein. When the target is a host signaling protein, the result can provide evidence of altered immune-response pathways; when it is a pathogen antigen, the comparison can support analysis of infection-associated molecular changes. Interpretation relies on both signal and protein size.
The workflow proceeds from protein separation to membrane transfer and antibody-based detection. First, proteins in the biological sample are separated according to size by gel electrophoresis. They are then transferred to a membrane, exposed to a primary antibody, and detected through a labeled secondary antibody that generates a measurable signal for comparison.
This technique is useful when investigators need to examine specific proteins within complex biological samples. Applications include identifying pathogen antigens, evaluating host signaling proteins, comparing protein expression across experimental conditions, and investigating molecular changes associated with infection or immune activation. It can also provide protein-level evidence that complements findings from other assays.
Western immunoblotting can serve as a confirmation step by testing whether a specific protein is present and showing how its relative abundance differs between conditions. Antibody recognition supplies target specificity, while electrophoretic separation adds protein-size information. Together, these features help researchers evaluate whether results from other assays correspond to a particular protein-level change.