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Ultra-High-Speed Western Blot using Immunoreaction Enhancing Technology
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Enhancing single-cell western blotting sensitivity using diffusive analyte blotting and antibody conjugate
Mariia Alibekova Long1,2,3, William Benman1,2, Nathan Petrikas1,4
1Department of Bioengineering, University of Pennsylvania, Philadelphia, PA, 19104, PA, USA.
Biorxiv : the Preprint Server for Biology
|July 3, 2023
Summary
Researchers improved single-cell western blot (scWestern) sensitivity for detecting low-abundance proteins. By transferring separations to nitrocellulose and using enzyme-antibody conjugates, they achieved a 520-fold improvement in detection limits.
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Biology
Background:
- Single-cell analysis is crucial for understanding cellular heterogeneity.
- Detecting proteins in single cells faces challenges with sensitivity and throughput compared to nucleic acid detection.
- Existing single-cell western blot (scWestern) techniques struggle with low-abundance protein detection due to gel transport barriers.
Approach:
- Decoupled the electrophoretic separation medium from the detection medium in scWesterns.
- Transferred scWestern separations to a nitrocellulose blotting medium to overcome mass transfer limitations.
- Utilized enzyme-antibody conjugates for signal amplification, incompatible with traditional in-gel probing.
Key Points:
- Achieved a 5.9-fold improvement in the limit of detection by transferring scWesterns to nitrocellulose.
- Further enhanced sensitivity to detect 10^3 molecules, a 520-fold improvement over previous methods.
- Successfully detected EGFP in 85-100% of cells, significantly improving upon the 47% detection rate with in-gel methods.
Conclusions:
- Nitrocellulose-immobilized scWesterns significantly enhance sensitivity for low-abundance protein detection.
- This approach expands compatibility with various affinity reagents for improved signal amplification.
- The improved scWestern method offers a powerful tool for sensitive single-cell proteomic analysis.
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