Mapping Protein Interactions with Antibodies and Mass Spectrometry
Author Information
Author(s): Michael R. Dyson, Yong Zheng, Cunjie Zhang, Karen Colwill, Kritika Pershad, Brian K. Kay, Tony Pawson, John McCafferty
Primary Institution: Department of Biochemistry, University of Cambridge
Hypothesis
Can we improve the affinity of antibodies for better immunoprecipitation of protein interactions?
Conclusion
The study demonstrates a scalable method for generating high-affinity antibodies that can successfully capture protein interactions in cell lysates.
Supporting Evidence
- Only 12% of antibodies had sufficient affinity to capture endogenous targets from lysates.
- Affinity improvement was a key determinant for success in immunoprecipitation.
- Seven known binding partners of SHC1 were identified using mass spectrometry.
Takeaway
Scientists created better antibodies to help find how proteins interact in cells, which is important for understanding diseases like cancer.
Methodology
The study used phage display to generate antibodies, followed by affinity maturation through chain shuffling and immunoprecipitation coupled with mass spectrometry to identify protein interactions.
Potential Biases
Potential bias in the selection of antibodies that may not represent the full diversity of the antibody repertoire.
Limitations
Only a minority of antibodies were successful in capturing the target protein, indicating that both affinity and epitope availability are critical.
Statistical Information
P-Value
p<0.05
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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