Related Experiment Video
Updated: Aug 9, 2026
10:23
Synthesis of Cationized Magnetoferritin for Ultra-fast Magnetization of Cells
Published on: December 13, 2016
Reduction of mammalian ferritin
Summary
Horse spleen ferritin undergoes electrochemical reduction, with iron ions (Fe3+) reduced to ferrous ions (Fe2+). This process involves electron transfer and proton uptake, confirmed by Mössbauer spectroscopy.
Area of Science:
- Biochemistry
- Electrochemistry
- Biophysical Chemistry
Background:
- Mammalian ferritin is a protein complex responsible for iron storage.
- Understanding ferritin's redox properties is crucial for elucidating iron metabolism and storage mechanisms.
- Previous studies have explored ferritin's structure and iron binding, but detailed electrochemical reduction pathways require further investigation.
Purpose of the Study:
- To investigate the electrochemical reduction of mammalian ferritin from horse spleen.
- To determine the number of electrons transferred per ferritin molecule and the associated midpoint potentials.
- To explore the relationship between iron reduction and proton transfer within the ferritin core.
Main Methods:
- Electrochemical reduction of horse spleen ferritin.
- Determination of midpoint potentials at various pH values (7.0, 8.0, 9.0).
- Mössbauer spectroscopy to analyze the oxidation states of iron in partially reduced ferritin.
Main Results:
- Ferritin undergoes reduction, with each iron atom (Fe3+) accepting one electron to become Fe2+.
- Midpoint potentials were measured at -190 mV (pH 7.0), -310 mV (pH 8.0), and -416 mV (pH 9.0).
- Mössbauer spectra revealed a mixture of ferric and ferrous iron doublets, consistent with the degree of electrochemical reduction.
Conclusions:
- The pH-dependent midpoint potentials indicate the transfer of approximately 2 protons for every Fe3+ reduced to Fe2+.
- Electrochemical and Mössbauer data collectively support a model of stepwise iron reduction coupled with proton uptake in ferritin.
- This study provides quantitative insights into the redox chemistry of iron storage in mammalian ferritin.
Related Concept Videos
01:16Necrosis
Necrosis is considered as an “accidental” or unexpected form of cell death that ends in cell lysis. The first noticeable mention of “necrosis” was in 1859 when Rudolf Virchow used this term to describe advanced tissue breakdown in his compilation titled “Cell Pathology”.
Morphological Manifestations of Necrosis
Necrotic cells show different types of morphological appearance depending on the type of tissue and infection. In coagulative necrosis, cells become anucleated and die, but their...
Morphological Manifestations of Necrosis
Necrotic cells show different types of morphological appearance depending on the type of tissue and infection. In coagulative necrosis, cells become anucleated and die, but their...
01:24Microbes and Other Elemental Cycles
Microbial activity plays a pivotal role in the biogeochemical cycling of iron and manganese, especially at the redox gradients characteristic of stratified aquatic environments. These cycles are driven by microbial transformations between oxidized and reduced forms of the metals, allowing organisms to exploit them for metabolic energy and structural purposes.Iron Cycling Across Redox GradientsIn neutral, oxygen-rich surface waters, iron is predominantly found in its oxidized, insoluble ferric...