Related Experiment Videos
Interaction of chlorpromazine with hemoglobin
M Bhattacharyya1, U Chaudhuri, R K Poddar
1Department of Biophysics, Molecular Biology & Genetics, University of Calcutta, India.
Indian Journal of Biochemistry & Biophysics
|August 1, 1990
Summary
Chlorpromazine (CPZ) exhibits positive cooperative binding with hemoglobin, influencing oxygen release. This interaction
Area of Science:
- Biochemistry
- Pharmacology
- Molecular Biophysics
Background:
- Hemoglobin's function involves oxygen transport.
- Chlorpromazine (CPZ) is a medication used for psychiatric conditions.
- Drug-protein interactions are crucial for understanding drug efficacy and side effects.
Purpose of the Study:
- To investigate the binding mechanism of chlorpromazine (CPZ) with hemoglobin.
- To quantify the binding parameters and cooperativity.
- To determine the effect of CPZ binding on hemoglobin's oxygen affinity.
Main Methods:
- Equilibrium dialysis was employed to study CPZ-hemoglobin binding.
- Scatchard and Hill plots were utilized to analyze binding data.
- Stoichiometric ratios of CPZ to hemoglobin (D/P) were varied.
Main Results:
- The r/Cf versus r plot showed a concave downward shape, indicating positive cooperativity.
- Binding affinity (K) and cooperativity (nH) were determined using the Hill plot.
- Oxygen was gradually released from hemoglobin upon CPZ addition, dependent on the CPZ:hemoglobin ratio.
Conclusions:
- Chlorpromazine (CPZ) binds to hemoglobin with positive cooperativity.
- CPZ binding affects hemoglobin's oxygen-carrying capacity.
- Understanding this interaction is important for CPZ's pharmacological profile.