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The Equilibrium Binding Constant and Binding Strength02:18

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Complexometric titration involves the formation of a complex by reacting a metal ion with one or more ligands. A visual indicator often detects the end point of a complexometric titration. It is added to the metal solution before the titration, forming a stable metal–indicator complex and imparting color to the solution. As the titration approaches the equivalence point, the excess of the added ligand displaces the indicator from the metal–indicator complex, releasing the free...
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Isothermal Titration Calorimetry for Measuring Macromolecule-Ligand Affinity
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Measuring Multivalent Binding Interactions by Isothermal Titration Calorimetry.

Tarun K Dam1, Melanie L Talaga2, Ni Fan2

  • 1Laboratory of Mechanistic Glycobiology, Department of Chemistry, Michigan Technological University, Houghton, Michigan, USA; Biotechnology Research Center, Michigan Technological University, Houghton, Michigan, USA.

Methods in Enzymology
|January 23, 2016
PubMed
Summary
This summary is machine-generated.

Modified isothermal titration calorimetry (ITC) methods enable reliable study of multivalent glycoconjugate-lectin binding. This reveals key thermodynamic insights into binding mechanisms, including negative cooperativity and scaffold effects.

Keywords:
BindingCalorimetryEnthalpyEntropyGlycoproteinLectinMucinMultivalencyScaffoldStoichiometry

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Area of Science:

  • Biochemistry
  • Biophysical Chemistry
  • Molecular Interactions

Background:

  • Multivalent glycoconjugate-protein interactions are crucial in biological processes.
  • Isothermal titration calorimetry (ITC) is a powerful tool for studying molecular interactions.
  • Investigating multivalency with ITC is challenging due to precipitation issues.

Purpose of the Study:

  • To develop modified ITC methods for reliable thermodynamic analysis of multivalent glycoconjugate-lectin binding.
  • To adapt the Hill plot equation for analyzing high-quality ITC data from multivalent interactions.
  • To gain molecular insights into the mechanisms governing these interactions.

Main Methods:

  • Modification of standard ITC protocols to prevent precipitation during titration.
  • Application of a modified Hill plot equation for thermodynamic data analysis.
  • Experimental investigation of multivalent glycoconjugate binding to lectins.

Main Results:

  • Successfully obtained high-quality ITC data for multivalent glycoconjugate-lectin binding.
  • Demonstrated the importance of functional valence and entropic contributions to binding affinity.
  • Observed negative cooperativity and internal diffusion (bind and jump) mechanisms in lectin binding.
  • Showed that glycoconjugate scaffolds influence binding entropy.

Conclusions:

  • Modified ITC and Hill plot analysis provide valuable thermodynamic parameters for multivalent interactions.
  • These methods elucidate the molecular mechanisms of lectin-glycoconjugate binding, including cooperativity and dynamics.
  • Understanding these interactions is vital for various biological and biomedical applications.