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A Protocol for Phage Display and Affinity Selection Using Recombinant Protein Baits
Published on: February 16, 2014
Evolution of binding affinity in a WW domain probed by phage display
P A Dalby1, R H Hoess, W F DeGrado
1Department of Biochemical Engineering, University College London, United Kingdom.
Protein Science : a Publication of the Protein Society
|February 24, 2001
Summary
Researchers engineered novel WW domains with enhanced binding affinity and stability for the xPPxY motif. These new sequences, not found in nature, expand the known repertoire of peptide recognition motifs.
Area of Science:
- Biochemistry
- Molecular Biology
- Protein Engineering
Background:
- WW domains are peptide-binding motifs recognizing various sequences, notably the xPPxY consensus.
- Understanding WW domain-peptide interactions is crucial for deciphering cellular signaling pathways.
Purpose of the Study:
- To engineer novel WW domains with improved binding affinity and stability.
- To identify new WW domain consensus sequences beyond those found in nature.
Main Methods:
- Phage display was used to evolve the human YAP65 WW (hYAP65 WW) domain.
- Randomization of the beta-sheet within the WW domain was performed.
- Selection involved a specific peptide (WW1) and proteinase K to simultaneously select for affinity and stability.
Main Results:
- Novel WW domain sequences with higher affinity for the xPPxY motif were identified.
- Selected binders exhibited varied cooperative and noncooperative thermal unfolding profiles, indicating diverse stability characteristics.
- The identified consensus sequences are not present in naturally occurring WW domains.
Conclusions:
- A significant number of novel motifs can recognize the target peptide sequence.
- Nature utilizes only a subset of the potential WW domain sequences for peptide recognition.
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