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A universal thermodynamic approach to analyze biomolecular binding experiments.
1Department of Biophysical Chemistry, Biocenter of the University of Basel, Switzerland. gerhard.schwarz@unibas.ch
Biophysical Chemistry
|October 12, 2000
Summary
This study introduces a model-independent method to determine thermodynamic properties of binding processes using titration data. The technique yields a linear plot revealing binding ratios and free ligand concentrations for accurate binding isotherms.
Area of Science:
- Biochemistry
- Physical Chemistry
- Chemical Thermodynamics
Background:
- Binding processes involve ligand-macromolecule or ligand-aggregate interactions.
- Complex mechanisms like conformational changes and cooperativity can influence binding.
- Model-independent thermodynamic analysis is crucial for understanding binding.
Purpose of the Study:
- To present a general, model-independent method for determining thermodynamic properties of binding.
- To establish a specific binding isotherm from experimental data.
- To reveal structural features of physical measuring signals during binding.
Main Methods:
- Utilizing a series of titration measurements with varying ligand and binding factor concentrations.
- Processing experimental data to generate a linear mass conservation plot.
- Analyzing the slope and intercept of the plot to derive binding parameters.
Main Results:
- The mass conservation plot yields the binding ratio (bound ligand/binding factor) as the slope.
- The free ligand concentration is determined by the ordinate intercept.
- This method successfully establishes specific binding isotherms.
Conclusions:
- The developed method provides a general approach to analyze binding thermodynamics without pre-defined models.
- It accurately quantifies binding parameters and reveals underlying structural information.
- The methodology is applicable to various binding scenarios, including adsorption and film insertion.