Related Experiment Videos
A thermodynamic model of hemoglobin suitable for physiological applications
1Isotope and Structural Chemistry, Group INC-4, Los Alamos National Laboratory, New Mexico 87545.
The American Journal of Physiology
|March 1, 1990
Summary
We developed a thermodynamic model for hemoglobin binding to five key ligands. This model accurately predicts ligand binding and thermodynamic parameters, aligning with experimental data.
Area of Science:
- Biophysics
- Biochemistry
- Physical Chemistry
Background:
- Hemoglobin's complex allosteric behavior arises from interactions with multiple ligands.
- Understanding hemoglobin thermodynamics is crucial for studying oxygen transport and related diseases.
Purpose of the Study:
- To develop a quantitative thermodynamic model for hemoglobin.
- To incorporate established formalisms for quaternary transitions and electrostatic interactions.
- To enable efficient computation of observable quantities and parameter estimation.
Main Methods:
- Utilized the two-state formalism (Monod, Wyman, Changeux, 1965) for quaternary transitions.
- Applied the mean field formalism (Linderstrom-Lang, 1924) for electrostatic interactions.
- Developed an algorithm for computing ligand binding site occupancy and an objective statistical procedure for parameter determination.
Main Results:
- The model quantitatively describes hemoglobin thermodynamics with five major ligands: O2, CO2, Cl-, 2,3-bisphosphoglycerate, and H+.
- An efficient computational algorithm was developed for observable quantities.
- A statistical procedure was established for determining maximum likelihood values and confidence limits of thermodynamic parameters.
Conclusions:
- The proposed quantitative model successfully integrates key thermodynamic principles governing hemoglobin function.
- The model's predictions demonstrate strong agreement with independent experimental observations.
- This approach provides a robust framework for analyzing hemoglobin's complex ligand-binding behavior.