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Dissociation of ferritins.
M C Linder1, H R Kakavandi, P Miller
1Department of Chemistry and Biochemistry, California State University, Fullerton 92634.
Archives of Biochemistry and Biophysics
|March 1, 1989
Summary
Ferritin readily dissociates into subunit dimers under acidic conditions. Further dissociation into individual subunits requires complete protein denaturation, not achieved by common chemical treatments.
Area of Science:
- Biochemistry
- Protein structure and dynamics
Background:
- Ferritin is a protein complex that stores iron.
- Understanding ferritin's dissociation is crucial for its function and potential applications.
Purpose of the Study:
- To investigate the dissociation behavior of apoferritins from different sources.
- To determine the conditions required for complete subunit monomer dissociation.
Main Methods:
- Acidic dissociation (pH 1.3-3.0)
- Sedimentation velocity and equilibrium studies
- Gel chromatography (Sephadex G-75 and G-150)
- Treatment with various denaturing agents
Main Results:
- Apoferritins dissociated into 3.2 S material, corresponding to subunit dimers (MW 38,000-43,000).
- Complete dissociation into monomers was not achieved with common chemical treatments, except boiling in SDS.
- Reassociation occurred between pH 4 and 7, independent of Fe(II) or reducing agents.
Conclusions:
- Ferritin readily dissociates to subunit dimers.
- Further dissociation to monomers requires full protein denaturation.