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Iron uptake in fungi: a system for every source
1Liver Disease Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD, USA. carolinep@intra.niddk.nih.gov
Biochimica Et Biophysica Acta
|June 30, 2006
Summary
Fungi efficiently absorb diverse iron forms using unique reductive and non-reductive systems. These fungal iron uptake mechanisms involve specific transporters and cellular processes for nutrient acquisition.
Area of Science:
- Mycology
- Biochemistry
- Cell Biology
Background:
- Fungi exhibit a significant ability to acquire iron from various sources.
- Iron is essential for fungal growth and pathogenesis.
- Fungi possess multiple iron uptake systems, some unique to eukaryotes.
Purpose of the Study:
- To elucidate the diverse mechanisms fungi employ for iron uptake.
- To characterize the reductive and non-reductive iron assimilation pathways in fungi.
- To identify the specific transporters and cellular processes involved in fungal iron acquisition.
Main Methods:
- Analysis of fungal iron uptake pathways.
- Characterization of reductive and non-reductive iron assimilation systems.
- Identification of iron transporters and their substrate specificities.
Main Results:
- Fungi can uptake iron in multiple forms, including ions, chelates, siderophores, transferrin, heme, and hemoglobin.
- A reductive iron uptake system utilizes a ferrous-specific oxidase/permease complex for broad substrate recognition.
- A non-reductive system demonstrates specificity for siderophore-iron chelates, involving complex intracellular trafficking.
Conclusions:
- Fungi employ sophisticated and varied iron uptake systems to ensure nutrient acquisition.
- The reductive and non-reductive pathways highlight the adaptability of fungal iron metabolism.
- Understanding these systems is crucial for targeting fungal growth and development.