What Is Ferrichrome? Definition and What Research Reports
Ferrichrome is a small cyclic hexapeptide siderophore — an iron(III)-chelating molecule produced mainly by fungi and some bacteria. Its three hydroxamate groups wrap a single ferric ion, and cells take the complex up through dedicated transporters and receptors. In peptide research the term usually appears in studies of microbial iron acquisition, siderophore receptors as antibacterial targets, siderophore biosynthesis, and radiolabelled siderophore imaging probes. The published literature on ferrichrome is microbiological and preclinical; it is not a human therapeutic peptide.
Definition
Ferrichrome is a siderophore: a low-molecular-weight, iron(III)-binding molecule secreted by microorganisms to scavenge iron from their environment. Structurally it is a cyclic hexapeptide, built from three glycine residues and three modified ornithine residues (N⁵-acyl-N⁵-hydroxyornithines) whose three hydroxamate groups together form a six-coordinate cage around a single ferric ion. Because it is a peptide backbone that performs a metal-chelation job, ferrichrome sits at the intersection of peptide chemistry and bioinorganic chemistry, and it is one of the most widely used model compounds for studying how cells recognise, import and unload iron-loaded siderophores. It is a research and natural-product molecule, not an approved drug or a human therapeutic peptide.
What Class of Molecule Is It?
- Chemical class: hydroxamate-type siderophore, in contrast to catecholate siderophores such as enterobactin and mixed-type siderophores.
- Peptide class: a cyclic hexapeptide, produced by non-ribosomal biosynthetic machinery rather than by ribosomal translation — researchers elucidated the ferrichrome siderophore biosynthetic pathway in an albomycin-producing Streptomyces sp. ATCC 700974 and described the enzymatic steps involved (PMID 36870685).
- Family: "ferrichrome-type" is used as a family label as well as a single compound name; a 2025 natural-products study reported new ferrichrome-type siderophores isolated from Fusarium lateritium cultured on sodium nitrate-supplemented rice medium (PMID 40991163).
- State in which it is studied: usually as either the iron-free (apo) peptide or the iron-loaded complex, sometimes called ferric ferrichrome.
Where Ferrichrome Comes From
Ferrichrome is classically described as a fungal product, and much of the published work uses fungi as both producers and consumers. A 2016 study identified ferrichrome- and ferrioxamine B-mediated iron uptake by the mould Aspergillus fumigatus (PMID 26929401), and a 2025 report described previously undescribed ferrichrome-type siderophores produced by the fungus Fusarium lateritium under nitrate-supplemented culture conditions (PMID 40991163). Bacteria also make and use it: the biosynthetic route in an albomycin-producing actinomycete was mapped by researchers in a 2023 study (PMID 36870685).
Many microbes that do not synthesise ferrichrome still import it as a "xenosiderophore" — a siderophore made by someone else. That distinction matters in the literature, because uptake studies and biosynthesis studies ask different questions about the same molecule.
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Try it freeHow the Term Is Used in Peptide Research
As a transporter substrate
Ferrichrome is the reference cargo for siderophore transport work. An early mechanistic study examined the transport of ferrichrome through the yeast transporter Arn1p and its subsequent metabolism in Saccharomyces cerevisiae (PMID 12721368). More recently, researchers reported that fission yeast cells deficient in siderophore biosynthesis required the transporter Str2 for ferrichrome-dependent growth (PMID 39980688). Transport is not only inward: a 2024 study described the Bradyrhizobium japonicum exporter ExsFGH as being involved in efflux of ferric xenosiderophores from the periplasm (PMID 38166112).
As a receptor ligand and potential antibacterial target
Because pathogens depend on iron, the proteins that bind ferrichrome have been examined as targets. One study proposed the ferrichrome receptor FiuA as a new target for Pseudomonas aeruginosa virulence attenuation (PMID 27190289), and a separate report identified Trp158 as a crucial residue stabilising the ferrichrome–PiaA complex in the Streptococcus pneumoniae lipoprotein PiaA (PMID 28341101).
As a model for iron release
Once inside the cell, the iron has to come off the peptide. A 2021 structural and functional characterisation described FhuF, a ferric siderophore reductase from Escherichia coli, in the context of reductive iron release from hydroxamate siderophores (PMID 33559753).
As a carrier scaffold
Two carrier applications recur in the literature. The first is the "Trojan horse" concept exemplified by albomycin, a sideromycin antibiotic whose ferrichrome-type carrier portion was the subject of the biosynthesis study noted above (PMID 36870685). The second is molecular imaging: a 2024 paper described the preclinical characterisation of gallium-68 labelled ferrichrome siderophore stereoisomers for PET imaging applications (PMID 38436776).
What the Published Literature Reports
The verified literature summarised on this page is laboratory and preclinical. Across it, the study designs cluster into biosynthesis, transport, receptor structure and radiolabelling, as shown below.
| Study focus | Biological system | What researchers reported |
|---|---|---|
| Uptake of fungal and bacterial siderophores | Aspergillus fumigatus | Ferrichrome- and ferrioxamine B-mediated iron uptake was identified (PMID 26929401) |
| Transport and intracellular handling | Saccharomyces cerevisiae | The mechanism of ferrichrome transport through Arn1p and its metabolism were characterised (PMID 12721368) |
| Transporter dependency | Fission yeast | Siderophore-biosynthesis-deficient cells required Str2 for ferrichrome-dependent growth (PMID 39980688) |
| Receptor as antivirulence target | Pseudomonas aeruginosa | The ferrichrome receptor FiuA was proposed as a target for virulence attenuation (PMID 27190289) |
| Ligand–protein binding | Streptococcus pneumoniae | Trp158 was identified as crucial for stabilising the ferrichrome–PiaA complex (PMID 28341101) |
| Iron release chemistry | Escherichia coli | FhuF, a ferric siderophore reductase, was structurally and functionally characterised (PMID 33559753) |
| Biosynthesis | Streptomyces sp. ATCC 700974 | The ferrichrome siderophore biosynthetic pathway in an albomycin producer was elucidated (PMID 36870685) |
| Siderophore efflux | Bradyrhizobium japonicum | The ExsFGH exporter was reported to be involved in periplasmic efflux of ferric xenosiderophores (PMID 38166112) |
| Radiolabelling and imaging | Preclinical PET | Gallium-68 labelled ferrichrome stereoisomers were characterised for PET imaging applications (PMID 38436776) |
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The verified papers cited here are microbiological, biochemical, structural or preclinical imaging studies; none of them was a human clinical trial, and none reported human dosing, human safety outcomes or adverse-event rates for ferrichrome. The closest to an in vivo setting is the preclinical characterisation of gallium-68 labelled ferrichrome stereoisomers conducted for PET imaging applications (PMID 38436776), which is a radiopharmaceutical development context rather than a therapeutic one. Readers comparing ferrichrome to clinically used iron chelators should note that those are separate compounds with their own literature, and no such comparison is made in the studies listed above.
Related Terms and Common Mix-Ups
- Ferrichrome vs. ferrioxamine B: both are hydroxamate siderophores, and the two were studied together as iron sources in the Aspergillus fumigatus uptake study (PMID 26929401), but they are chemically distinct molecules.
- Ferrichrome vs. ferrichrome-type: the latter is a structural family label, used for example in the description of new siderophores from Fusarium lateritium (PMID 40991163).
- Siderophore vs. sideromycin: a sideromycin such as albomycin couples a siderophore carrier to an antibiotic warhead; the ferrichrome-type carrier biosynthesis in an albomycin producer was mapped in a 2023 study (PMID 36870685).
- Receptor names: ferrichrome-binding proteins carry organism-specific names such as FiuA in P. aeruginosa (PMID 27190289), PiaA in S. pneumoniae (PMID 28341101) and Arn1p in budding yeast (PMID 12721368).
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Start learning freeWhy the Term Appears in Peptide Glossaries
Ferrichrome is included in peptide reference material because it is a genuine peptide — a cyclic, non-ribosomally assembled hexapeptide — whose function depends on peptide conformation rather than on receptor signalling. It illustrates several concepts that recur elsewhere in peptide science: cyclisation as a stability strategy, side-chain modification (hydroxamate formation on ornithine) as a functional device, stereochemistry as a determinant of biological recognition, as examined in the study of gallium-68 labelled ferrichrome stereoisomers (PMID 38436776), and peptide scaffolds used as delivery carriers. It is a definitional entry only; no part of this page describes human use.
This page is for educational purposes only and is not medical advice; consult a licensed physician about any health question or before acting on any information described in the scientific literature.
References
- Identification of ferrichrome- and ferrioxamine B-mediated iron uptake by Aspergillus fumigatus (The Biochemical Journal, 2016)
- Preclinical characterisation of gallium-68 labeled ferrichrome siderophore stereoisomers for PET imaging applications (EJNMMI Radiopharmacy and Chemistry, 2024)
- The ferrichrome receptor A as a new target for Pseudomonas aeruginosa virulence attenuation (FEMS Microbiology Letters, 2016)
- Conjuring up a ghost: structural and functional characterization of FhuF, a ferric siderophore reductase from E. coli (Journal of Biological Inorganic Chemistry, 2021)
- New ferrichrome-type siderophores produced by Fusarium lateritium cultured on sodium nitrate-supplemented rice medium (Journal of Natural Medicines, 2025)
- The mechanism of ferrichrome transport through Arn1p and its metabolism in Saccharomyces cerevisiae (PNAS, 2003)
- Elucidation of the ferrichrome siderophore biosynthetic pathway in albomycin-producing Streptomyces sp. ATCC 700974 (The Journal of Biological Chemistry, 2023)
- The Bradyrhizobium japonicum exporter ExsFGH is involved in efflux of ferric xenosiderophores from the periplasm (PLoS One, 2024)
- Crucial residue Trp158 of lipoprotein PiaA stabilizes the ferrichrome-PiaA complex in Streptococcus pneumoniae (Journal of Inorganic Biochemistry, 2017)
- Fission yeast cells deficient in siderophore biosynthesis require Str2 for ferrichrome-dependent growth (Frontiers in Microbiology, 2025)
Frequently asked questions
What is ferrichrome in one sentence?▾
Ferrichrome is a fungal cyclic hexapeptide siderophore whose three hydroxamate groups chelate a single iron(III) ion, allowing microbes to scavenge and import iron. It is studied as a model substrate for siderophore transporters and receptors, including the yeast transporter Arn1p (PMID 12721368) and the pneumococcal lipoprotein PiaA (PMID 28341101). It is a laboratory and natural-product molecule, not a human therapeutic.
Is ferrichrome a peptide?▾
Yes, in the structural sense: it is a cyclic hexapeptide assembled by non-ribosomal machinery rather than by ribosomal translation. Researchers elucidated the ferrichrome siderophore biosynthetic pathway in an albomycin-producing Streptomyces strain, describing the enzymatic steps that build the peptide and its modified ornithine residues (PMID 36870685). Its biological role is metal chelation rather than receptor signalling.
Which organisms produce or use ferrichrome?▾
Fungi are the classical producers, and a 2025 study reported new ferrichrome-type siderophores from Fusarium lateritium grown on sodium nitrate-supplemented rice medium (PMID 40991163). Other organisms import it as a xenosiderophore: a study identified ferrichrome-mediated iron uptake by Aspergillus fumigatus (PMID 26929401), and fission yeast lacking siderophore biosynthesis required Str2 for ferrichrome-dependent growth (PMID 39980688).
Why is ferrichrome studied in antibacterial research?▾
Because pathogens need iron, the proteins that capture ferrichrome are candidate targets. One study proposed the ferrichrome receptor FiuA as a target for Pseudomonas aeruginosa virulence attenuation (PMID 27190289), and another identified Trp158 as a crucial residue stabilising the ferrichrome–PiaA complex in Streptococcus pneumoniae (PMID 28341101). Siderophore carriers have also been linked to sideromycin antibiotics such as albomycin (PMID 36870685).
What happens to the iron once ferrichrome enters a cell?▾
The iron must be released from the hydroxamate cage, often by reduction. A 2021 structural and functional characterisation described FhuF, a ferric siderophore reductase from Escherichia coli, in that context (PMID 33559753). In budding yeast, researchers examined transport through Arn1p together with the subsequent intracellular metabolism of ferrichrome (PMID 12721368).
Has ferrichrome been used in imaging research?▾
Yes, as a chelating scaffold for radiometals. A 2024 paper reported the preclinical characterisation of gallium-68 labelled ferrichrome siderophore stereoisomers for PET imaging applications (PMID 38436776). That work sits in radiopharmaceutical development rather than therapeutics, and the study did not report human treatment outcomes.
Are there human safety data on ferrichrome?▾
The published studies summarised here are microbiological, biochemical, structural or preclinical imaging work, and none reported human dosing or adverse-event data for ferrichrome — including the preclinical gallium-68 ferrichrome stereoisomer characterisation (PMID 38436776). This page is for educational purposes only and is not medical advice; consult a licensed physician with any health question.
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References
This page summarises published research for education — it is not medical advice, and nothing here is a recommendation to use, purchase, or dose any substance. Study parameters described are what researchers reported, not instructions. Consult a qualified clinician before any health decision.