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Using Phage Display to Develop Ubiquitin Variant Modulators for E3 Ligases
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From phage display to dendrimer display: insights into multivalent binding.

Maartje M C Bastings1, Brett A Helms, Ingrid van Baal

  • 1Institute for Complex Molecular Systems, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands.

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|April 9, 2011
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Multivalent phage display significantly enhances binding affinity, but this effect is highly dependent on receptor density. Ligand selection should occur at physiologically relevant receptor densities for effective in vivo applications.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Biotechnology

Background:

  • Phage display is a key technique for identifying peptide ligands.
  • Multivalent presentation can enhance binding affinity compared to monovalent ligands.
  • Streptavidin (SA) serves as a model multivalent receptor for studying binding interactions.

Purpose of the Study:

  • To analyze the impact of valency, linker, and receptor density on the binding affinity of multivalent phage peptide constructs.
  • To compare the binding affinities of monovalent peptides, dendritic phage peptides, and phage particles.
  • To investigate the influence of receptor density on multivalent binding strategies.

Main Methods:

  • Utilized phage display to select target-specific peptide sequences.
  • Constructed multivalent dendritic phage peptide systems.
  • Assessed binding affinities using streptavidin (SA) as a model receptor across varying receptor densities.
  • Compared binding affinities of monovalent peptides, dendritic constructs, and phage particles.

Main Results:

  • Multivalent dendritic phage peptides showed a >2-log increase in binding affinity on low-density surfaces compared to monovalent forms (Kd: 120 μM vs 1 μM).
  • Phage particles exhibited significantly higher affinity (16 pM) on dense SA surfaces than dendritic constructs.
  • Binding affinity for both phage and dendritic constructs decreased substantially with reduced SA surface density.
  • Dendrimer display achieved up to a 10^4-fold affinity gain over monovalent peptides on dense SA surfaces.

Conclusions:

  • Ligand valency and receptor density critically influence multivalent binding affinity.
  • Phage display selection should ideally occur under conditions mimicking physiological receptor densities.
  • Optimizing in vivo targeting requires consideration of receptor density and biologically relevant surfaces.