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Evidence for multisite allosteric interactions on the band 3 monomer
Biochemical and Biophysical Research Communications
|March 30, 1987
Summary
Pyridoxal-5'-phosphate labels band 3 protein domains. Labeling one site (CH17) affects another (CH35), suggesting allosteric interactions within a single band 3 monomer.
Area of Science:
- Biochemistry
- Molecular Biology
- Membrane Transport
Background:
- Band 3 protein (anion exchanger 1) is crucial for erythrocyte membrane function.
- Band 3 protein contains distinct chymotryptic domains, CH17 and CH35.
- Pyridoxal-5 omino-phosphate (PLP) and stilbene disulfonates are known ligands for band 3.
Purpose of the Study:
- To investigate the relationship between PLP binding sites (CH17 and CH35) and stilbene disulfonate binding on band 3.
- To determine if allosteric interactions occur within a single band 3 monomer.
Main Methods:
- Selective, irreversible labeling of CH17 with PLP.
- Assessing the impact of CH17 labeling on stilbene disulfonate binding and transport inhibition.
Main Results:
- CH35 sites are mutually exclusive with stilbene disulfonate binding.
- CH17 sites are not mutually exclusive with stilbene disulfonate binding.
- Selective CH17 labeling reduced the inhibitory potency of stilbene disulfonates, indicating an effect on CH35 sites.
Conclusions:
- Multisite allosteric interactions can occur on a single band 3 monomer.
- The binding of ligands at different sites on band 3 are not independent.