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Related Experiment Videos

Vesicle aggregation by multivalent ligands: relating crosslinking ability to surface affinity.

Xi Wang1, Robert J Mart, Simon J Webb

  • 1Manchester Interdisciplinary Biocentre and the School of Chemistry, University of Manchester, 131 Princess Street, Manchester, UK.

Organic & Biomolecular Chemistry
|July 20, 2007
PubMed
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Increasing poly-l-histidine ligand valency enhanced vesicle aggregation size but not receptor binding affinity. A new model explains this by considering both intra- and inter-membrane binding interactions in tissue-mimetic vesicle systems.

Area of Science:

  • Biomaterials science
  • Supramolecular chemistry
  • Biophysics

Background:

  • Tissue-mimetic vesicles are crucial for biomaterial development.
  • Poly-l-histidine ligands are used for crosslinking vesicles.
  • Understanding ligand-receptor interactions is key to controlling aggregate stability.

Purpose of the Study:

  • To investigate the effect of poly-l-histidine ligand valency on vesicle aggregation and binding affinity.
  • To explore the stability of tissue-mimetic vesicle aggregates.
  • To develop a binding model for multivalent interactions in vesicle systems.

Main Methods:

  • Vesicle aggregation studies.
  • Isothermal titration calorimetry (ITC) to measure binding affinity.
  • Development of a new binding model.

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Main Results:

  • Increased ligand valency led to larger vesicle aggregates.
  • Isothermal calorimetric studies did not show a corresponding increase in valence-corrected binding constant.
  • A novel binding model was proposed to explain these findings.

Conclusions:

  • Ligand valency impacts vesicle aggregation differently than receptor binding affinity.
  • A new model accounting for intra- and inter-membrane binding is necessary for understanding these systems.
  • This work provides insights into designing stable biomimetic materials.