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Structure, function, and nutrition of phytoferritin: a newly functional factor for iron supplement
Xiayun Liao1, Shaojun Yun, Guanghua Zhao
1a CAU & ACC Joint-Laboratory of Space Food, Center for Human Nutrition and Health, College of Food Science and Nutritional Engineering , China Agricultural University , Beijing Key Laboratory of Functional Food from Plant Resources , Beijing , 100083 , China.
Critical Reviews in Food Science and Nutrition
|February 26, 2014
Summary
Phytoferritin, a plant-based iron storage protein, offers unique structural features and holds promise as a safe, effective iron supplement to combat iron deficiency anemia (IDA). Its distinct N-terminal extension peptide and H-type subunits facilitate iron management.
Area of Science:
- Biochemistry
- Plant Biology
- Nutritional Science
Background:
- Ferritins are vital iron storage proteins found across all life forms, crucial for maintaining cellular iron homeostasis.
- Phytoferritin, distinct from animal ferritin, resides in plastids and possesses unique structural characteristics.
- Iron deficiency anemia (IDA) remains a global health challenge, necessitating novel iron supplementation strategies.
Purpose of the Study:
- To review recent advancements in the structure, function, and nutritional applications of phytoferritin.
- To highlight phytoferritin's potential as a bioavailable, plant-derived iron source for addressing IDA.
- To compare and contrast the structural and functional attributes of phytoferritin with its animal counterpart.
Main Methods:
- Literature review focusing on structural analysis of phytoferritin.
- Examination of functional studies related to iron binding, oxidation, and release in plants.
- Analysis of research on phytoferritin's efficacy as an iron supplement in nutritional contexts.
Main Results:
- Phytoferritin possesses a unique N-terminal extension peptide (EP) that functions as a secondary ferroxidase center, regulating iron release.
- Unlike animal ferritins, phytoferritin is composed solely of H-type subunits (H-1 and H-2), which cooperate in iron oxidation.
- Legume seeds store over 90% of their iron in phytoferritin within amyloplasts, indicating significant iron storage capacity.
Conclusions:
- Phytoferritin's distinct structure, including the EP and H-type subunits, contributes to its specialized roles in plant iron metabolism.
- Plant-based ferritin shows considerable potential as a novel, bioavailable iron source for managing IDA in human populations.
- Further research into phytoferritin's structure-function-nutrition relationship can unlock its full therapeutic potential.
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