Target Protein Analysis
Target Protein Analysis - Related Videos
11:52
Analysis of Targeted Viral Protein Nanoparticles Delivered to HER2+ Tumors
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Cited by 1 •
2013
This article details the procedures for optical imaging analysis of the tumor-targeted nanoparticle, HerDox. In particular, detailed use of the multimode imaging device for detecting tumor targeting and assessing tumor penetration is described here.
10:21
Microsampling in Targeted Mass Spectrometry-Based Protein Analysis of Low-Abundance Proteins
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Cited by 6 •
2023
A protocol is presented for the determination of low-abundance biomarkers from dried serum samples exemplified with the biomarker progastrin-releasing peptide (ProGRP). Antibody-coated magnetic beads are used for the selective cleanup and enrichment of a proteotypic ProGRP peptide. The captured peptide is subsequently analyzed by liquid chromatography-tandem mass spectrometry.
05:22
Using Phage Display to Select Proteins with High Affinity to a Target Protein
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2025
In this video, we demonstrate the phage display technique to isolate pre-engineered phages expressing proteins with high affinity to the target protein.
08:16
Comparative Lesions Analysis Through a Targeted Sequencing Approach
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2019
This article describes a method to identify clonal and subclonal alterations among different specimens from a given patient. Although the experiments described here focus on a specific tumor type, the approach is broadly applicable to other solid tumors.
03:52
Immunofluorescence Assay to Evaluate Effect of Target Proteins on Neurite Outgrowth
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2025
In this video, we demonstrate an EGFP-based immunofluorescence assay to identify the efficacy of target proteins on the neurite outgrowth of primary cortical neurons. The primary neurons are transfected with a fluorescent protein, EGFP, and a target protein, and then an immunoassay is performed to investigate the effect of the target protein on neurite outgrowth.
FAQs
Antibodies identify a target through binding to a specific epitope, which is a recognizable region on the protein. Gel electrophoresis separates proteins before antibody-based detection, whereas mass spectrometry distinguishes proteins through ion-based measurement. Comparing these strategies helps researchers select evidence suited to confirming identity, estimating abundance, or characterizing molecular differences.
The research objective determines which protein feature receives emphasis. Antibody-based assays can indicate abundance, while gel electrophoresis and Western blotting support assessment of size. Immunofluorescence addresses localization, and mass spectrometry can contribute to protein characterization, including modification state or interactions. Matching the method to the feature prevents an assay from answering the wrong biological question.
Controls and normalization help separate genuine biological differences from variation introduced during measurement or sample comparison. Normalization provides a basis for comparing target-protein signals across conditions, while controls strengthen confidence that the observed result reflects the target rather than an unrelated change. These safeguards are especially important when comparing disease, treatment, or experimental groups.
Researchers should begin with the information they need rather than selecting a technique solely by familiarity. Western blotting is suited to examining a separated protein and its apparent size, immunofluorescence addresses where the protein is located, and mass spectrometry supports ion-based protein distinction and characterization. This question-driven choice makes the resulting measurement more relevant to the study.
A typical workflow first uses gel electrophoresis to separate proteins in the biological sample, followed by Western blotting to detect the selected protein with antibody recognition. The separation provides size-related information, while the antibody supplies target specificity. Including appropriate controls and normalization allows the resulting signal to support comparisons between samples or experimental conditions.
In signaling research, comparing target-protein measurements across conditions can help investigate pathway changes associated with disease or treatment. The same approaches can assess whether a protein is a potential biomarker candidate by examining its abundance or other characterized features in relevant samples. Interpretation remains strongest when method selection, controls, and normalization align with the biological comparison.