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Interaction of anions with iron-transferrin-chelate complexes
The Journal of Biological Chemistry
|November 25, 1977
Summary
Anions like phosphate and bicarbonate significantly impact iron-transferrin complexes. Bicarbonate addition rapidly destabilizes iron-EDTA complexes, causing iron and EDTA dissociation from transferrin.
Area of Science:
- Biochemistry
- Inorganic Chemistry
Background:
- Transferrin is a key iron-binding protein.
- Understanding anion interactions with transferrin is crucial for iron metabolism research.
Purpose of the Study:
- To investigate the effect of various anions on iron-ovotransferrin complexes.
- To elucidate the mechanism of iron and EDTA dissociation upon bicarbonate addition.
Main Methods:
- Spectrophotometry to monitor changes in visible absorbance.
- Use of radiolabeled iron (59Fe) and EDTA ([14C]EDTA) to track dissociation.
Main Results:
- Phosphate and citrate perturbed the absorbance spectrum of iron-transferrin-EDTA.
- Bicarbonate rapidly decreased absorbance and led to iron and EDTA dissociation.
- Lack of an isosbestic point suggested intermediate species during complex conversion.
Conclusions:
- Anion binding to the transferrin apoprotein is a key factor.
- There is an intimate relationship between anions and the binding of iron chelates by transferrin.