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Parameter estimation on multivalent ITC data sets.

Franziska Erlekam1, Maximilian Zumbansen1, Marcus Weber2

  • 1Zuse Institute Berlin, Takustraße 7, 14195, Berlin, Germany.

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Summary
This summary is machine-generated.

This study introduces an extended Wiseman fitting method to analyze complex molecular interactions. It accounts for intermediate binding steps, offering insights into the kinetics of multivalent binding processes.

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Area of Science:

  • Biophysical Chemistry
  • Biochemistry
  • Chemical Kinetics

Background:

  • Isothermal Titration Calorimetry (ITC) is crucial for determining binding parameters.
  • Classical Wiseman fitting assumes direct binding, overlooking intermediate steps and kinetics.
  • Multivalent binding processes often involve complex, multi-step interactions.

Purpose of the Study:

  • To extend the Wiseman fitting method to incorporate intermediate binding steps.
  • To rationalize the concentration-dependent dissociation constant observed in complex binding.
  • To explore the determination of kinetic parameters in multivalent binding.

Main Methods:

  • Modified Wiseman fitting incorporating variable binding rates per titration step.
  • Application of Robust Perron Cluster Cluster Analysis to analyze concentration dependency.
  • Integration of kinetic insights into thermodynamic binding analysis.

Main Results:

  • Demonstrated that concentration-dependent dissociation constants can arise from intermediate binding steps.
  • Developed a novel approach to analyze multivalent binding kinetics using modified Wiseman fitting.
  • Showcased a method to potentially determine kinetic parameters of intermediate steps.

Conclusions:

  • The extended Wiseman fitting provides a new perspective on analyzing multivalent binding.
  • This method offers a way to gain kinetic information from ITC data previously limited to thermodynamics.
  • The approach allows for a more nuanced understanding of complex molecular interactions.