Related Experiment Videos
Isolation of monomeric human V(H)s by a phage selection
Rebecca To1, Tomoko Hirama, Mehdi Arbabi-Ghahroudi
1Institute for Biological Sciences, National Research Council of Canada, Ottawa, Ontario K1A 0R6, Canada.
The Journal of Biological Chemistry
|October 14, 2005
Summary
Researchers identified 15 monomeric human V(H) domains using phage display and plaque size selection. These stable V(H) domains are promising scaffolds for immunotherapeutics development.
Area of Science:
- Biotechnology
- Immunology
- Protein Engineering
Background:
- Human V(H) domains are valuable for immunotherapies due to their human origin.
- A key challenge is their inherent tendency to aggregate, limiting therapeutic applications.
- Previous work showed engineered monomeric V(H) domains on phages yield larger plaques than wild-type V(H)s.
Purpose of the Study:
- To identify novel monomeric human V(H) domains with favorable biophysical properties.
- To utilize plaque size as a selection criterion for isolating stable V(H) domains.
- To establish a generalizable method for selecting proteins with desirable characteristics.
Main Methods:
- Employed a phage-displayed naïve human V(H) library.
- Used plaque size on bacterial lawns as a selection criterion.
- Screened for V(H) domains exhibiting larger plaque formation, indicative of monomeric status.
Main Results:
- Successfully identified 15 distinct human V(H) domains that were monomeric.
- These V(H)s exhibited high expression yields and good refolding capabilities post-thermal denaturation.
- Demonstrated resistance to aggregation during prolonged incubation and trypsin digestion at 37°C.
Conclusions:
- The 15 identified V(H) domains are suitable scaffolds for developing novel immunotherapeutics.
- The plaque size-based selection method is effective for isolating proteins with enhanced biophysical properties.
- This approach offers broad applicability for protein engineering and therapeutic development.