GO:0005381 iron ion transmembrane transporter activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0005381 describes the molecular function that enables the transfer of iron (Fe) ions across a membrane [1,4].
• Iron ion transmembrane transporters include channels, permeases, and siderophore-dependent systems that are essential for cellular iron uptake and distribution [4,7,8].
• Dysregulation of iron transport is linked to cancer, neurodegeneration, and metabolic disorders such as diabetes [1,2,3].
• Key genes include SLC39A14 (ZIP14), SLC11A1 (NRAMP1), and bacterial transporters like IrtAB and FhuA [4,7,8].
• CRISPR knockout, point mutation, knock-in, and overexpression models are powerful tools to dissect iron transport mechanisms [1,6].
• EDITGENE provides comprehensive CRISPR services to study iron ion transmembrane transporter activity in disease models.
Description
Iron is an essential trace element required for oxygen transport, DNA synthesis, and mitochondrial function. The movement of iron across cellular membranes is mediated by a specialized class of proteins that carry out iron ion transmembrane transporter activity, annotated as GO:0005381 [1,4]. This molecular function is critical for maintaining iron homeostasis, and its dysregulation contributes to a wide range of pathologies including cancer, neurodegeneration, and metabolic disorders [1,2,3]. Understanding the mechanisms, genes, and regulatory networks underlying iron transport is therefore a major focus of biomedical research. Recent studies have elucidated the structural and functional properties of iron transporters in both prokaryotes and eukaryotes, providing a foundation for therapeutic targeting [4,7,8].
iron ion transmembrane transporter activity At A Glance
| GO ID | GO:0005381 |
|---|---|
| GO term | iron ion transmembrane transporter activity |
| Ontology | molecular_function |
| Synonym | iron cation channel activity; iron channel activity; iron transporter activity; multicopper ferroxidase iron transport mediator activity; transmembrane iron ion permease activity; transmembrane iron permease activity; zinc, iron permease activity |
| Major function | Transfer of iron ions across biological membranes |
| Cellular location | Plasma membrane, endosomal membrane, mitochondrial membrane |
| Representative genes | SLC39A14, SLC11A1, FTH1, FTL, IrtAB (bacterial), FhuA (bacterial) |
| Associated diseases | Cancer, diabetes, acute pancreatitis, neurodegeneration |
What Is GO:0005381?
GO:0005381, iron ion transmembrane transporter activity, is defined as the molecular function that enables the transfer of iron (Fe) ions from one side of a membrane to the other. This activity is carried out by integral membrane proteins that form channels, permeases, or active transporters, often coupling iron movement to other ions or ATP hydrolysis [4,7,8].
Why Is iron ion transmembrane transporter activity Important in Cell Biology?
Iron ion transmembrane transporter activity is fundamental to cellular iron homeostasis, as it controls the uptake, distribution, and storage of iron. Dysregulation of this activity leads to iron overload or deficiency, which is implicated in cancer progression, metabolic disorders, and inflammatory conditions [1,2,3]. Moreover, iron transporters are essential for bacterial virulence and are therefore attractive targets for antimicrobial therapy [4,8].
• Maintains cellular iron homeostasis and prevents iron-induced oxidative stress.
• Supports mitochondrial iron import and function, with defects linked to tumorigenesis.
• Enables nontransferrin-bound iron uptake, relevant in iron overload conditions.
• Plays a role in immune defense and inflammation, as seen in acute pancreatitis.
• Contributes to copper and iron crosstalk in diabetes mellitus.
• Bacterial iron transporters are virulence factors and drug targets [4,8].
• Iron transport is essential for erythropoiesis and red blood cell function.
• Alterations in iron transport affect toxin synthesis in cyanobacteria.
• Provides a mechanism for zinc and iron uptake via ZIP transporters.
• Offers potential therapeutic targets for cancer and metabolic diseases [1,2].
What Happens During iron ion transmembrane transporter activity?
Iron Recognition and Binding
In simple terms: The transporter first grabs iron ions from the environment or from carrier proteins.
Iron transporters recognize and bind iron ions, often with the help of accessory proteins or siderophores. For example, the bacterial siderophore transporter IrtAB binds iron-loaded siderophores with high affinity. In eukaryotes, ZIP14 (SLC39A14) binds both zinc and nontransferrin-bound iron for cellular uptake.
Conformational Change and Translocation
In simple terms: The transporter changes shape to move the iron across the membrane.
Upon iron binding, transporters undergo conformational changes that allow the ion to pass through the membrane. Cryo-EM structures of IrtAB reveal a mechanism where ATP hydrolysis drives conformational cycling to translocate iron. Similarly, the FhuA transporter undergoes large-scale structural rearrangements to transport iron-siderophore complexes.
Iron Release and Cellular Distribution
In simple terms: Once inside, iron is released and used by the cell or stored.
After translocation, iron is released into the cytoplasm or targeted to organelles such as mitochondria. In mitochondria, iron is utilized for heme and iron-sulfur cluster synthesis. PINK1 deficiency leads to mitochondrial iron accumulation, highlighting the importance of proper iron release and distribution.
Regulation of Transporter Activity
In simple terms: The cell controls how much iron enters by adjusting transporter levels or activity.
Iron transport activity is regulated at multiple levels, including transcriptional control by iron-responsive elements (IREs) and post-translational modifications. For instance, ZIP14 expression is modulated by zinc and iron status. In bacteria, iron uptake is controlled by the ferric uptake regulator (Fur).
Key Genes Involved in GO:0005381 iron ion transmembrane transporter activity
The following genes encode proteins that exhibit iron ion transmembrane transporter activity or are directly involved in iron transport across membranes.
| Gene | Major Role | Research Relevance |
|---|---|---|
| SLC39A14 (ZIP14) | Zinc and nontransferrin-bound iron uptake | Iron overload, metabolic disorders |
| SLC11A1 (NRAMP1) | Divalent metal ion transport | Innate immunity, iron homeostasis |
| FTH1 | Ferritin heavy chain, iron storage | Iron storage and oxidative stress |
| FTL | Ferritin light chain, iron storage | Iron storage disorders |
| PINK1 | Mitochondrial iron regulation | Parkinson's disease, cancer |
| PIEZO1 | Mechanosensitive ion channel, iron transport | Erythrocyte function, blood disorders |
| IrtAB (M. tuberculosis) | Siderophore-mediated iron uptake | Tuberculosis pathogenesis |
| FhuA (E. coli) | Iron-siderophore transport | Antibiotic delivery, protein engineering |
| MgtA | Magnesium and iron transport | Bacterial metal homeostasis |
| ZIP8 | Zinc and iron transport | Metal homeostasis |
| DMT1 | Divalent metal transporter 1 | Iron uptake in intestine |
| Ferroportin | Iron export | Iron overload disorders |
| Hephaestin | Multicopper ferroxidase, iron transport | Iron efflux |
| Ceruloplasmin | Copper and iron homeostasis | Neurodegeneration |
| Steap3 | Ferrireductase, iron transport | Erythropoiesis |
| Mitoferrin | Mitochondrial iron import | Heme synthesis |
| Transferrin receptor | Iron uptake | Cell proliferation |
How Is iron ion transmembrane transporter activity Regulated?
Iron ion transmembrane transporter activity is regulated at transcriptional, post-transcriptional, and post-translational levels. The iron-responsive element/iron regulatory protein (IRE/IRP) system controls the expression of many iron transport genes in response to cellular iron levels. In bacteria, the Fur regulon represses iron uptake genes under iron-replete conditions. Additionally, copper homeostasis influences iron transport, as seen in diabetes mellitus where copper and iron crosstalk affects transporter function.
iron ion transmembrane transporter activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| PINK1 | Colon cancer, Parkinson's disease | PINK1 knockout colon cancer cell line |
| SLC39A14 | Iron overload, metabolic disorders | ZIP14 overexpression in hepatocytes |
| PIEZO1 | Erythrocyte disorders | PIEZO1 gain-of-function knock-in mice |
| IrtAB | Tuberculosis | M. tuberculosis IrtAB knockout |
| FhuA | Bacterial infections | FhuA-engineered E. coli for drug delivery |
Cancer and Mitochondrial Iron Accumulation
PINK1 deficiency leads to mitochondrial iron accumulation, which promotes colon tumorigenesis. This highlights the role of iron ion transmembrane transporter activity in maintaining mitochondrial iron homeostasis and preventing cancer.
Metabolic Disorders: Diabetes Mellitus
Copper and iron homeostasis are interconnected, and their dysregulation contributes to diabetes mellitus. Iron transporters such as ferroportin and hephaestin are affected by copper status, influencing glucose metabolism.
Acute Pancreatitis and Ion Channel Crosstalk
In acute pancreatitis, calcium, iron, and copper signals crosstalk in acinar cells. Iron transporters modulate inflammatory responses and cell death, suggesting a role in disease pathogenesis.
Bacterial Infections and Virulence
Mycobacterium tuberculosis relies on the IrtAB siderophore transporter for iron acquisition, which is essential for virulence. Targeting this transporter could provide new therapeutic strategies.
From iron ion transmembrane transporter activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of PINK1 affect mitochondrial iron transport? | PINK1 knockout cell line |
| How does ZIP14 contribute to nontransferrin-bound iron uptake? | SLC39A14 overexpression and knockout |
| What is the role of PIEZO1 in erythrocyte iron handling? | PIEZO1 point mutation knock-in |
| Can IrtAB be targeted for tuberculosis therapy? | IrtAB knockout M. tuberculosis |
| How does FhuA mediate iron-siderophore transport? | FhuA tagged knock-in in E. coli |
| Does iron transport affect toxin synthesis in cyanobacteria? | Microcystis aeruginosa knockout |
How to Study the iron ion transmembrane transporter activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| CRISPR knockout screening | Gene essentiality for iron transport | Identify novel transporters |
| Cryo-EM | 3D structure of transporters | Mechanistic studies of IrtAB |
| Proteomics | Protein expression changes | PIEZO1 mutations in erythrocytes |
| Fluorescent iron imaging | Intracellular iron levels | ZIP14 function |
| Patch-clamp | Ion channel activity | PIEZO1 and iron transport |
| RNA-seq | Transcriptional profiling | Iron transport gene expression |
| Bioinformatics | Pathway and network analysis | Iron transport in disease |
| Site-directed mutagenesis | Functional residues | FhuA engineering |
CRISPR Screening for Iron Transport Genes
Genome-wide CRISPR knockout screens can identify genes required for iron ion transmembrane transporter activity. For example, screens in cancer cells under iron-limited conditions reveal transporters essential for survival.
Proteomics and Structural Biology
Proteomic analysis of erythrocytes with PIEZO1 mutations reveals alterations in iron transport proteins. Cryo-EM structures of IrtAB provide mechanistic insights into siderophore-mediated iron transport.
Ion Flux Assays
Fluorescent iron indicators and patch-clamp techniques measure real-time iron transport activity across membranes. These assays are used to characterize ZIP14 and other transporters.
Transcriptomics and Bioinformatics
RNA-seq and bioinformatics analyses identify differentially expressed iron transport genes in diseases such as diabetes and pancreatitis [2,3].
How CRISPR Can Be Used to Study GO:0005381 iron ion transmembrane transporter activity
Knockout
CRISPR knockout of iron transporter genes such as SLC39A14 or PINK1 allows researchers to study loss-of-function phenotypes, including iron accumulation and tumorigenesis [1,7].
Point Mutation
Introducing point mutations in iron transporters, such as PIEZO1 gain-of-function mutations, helps dissect specific residues involved in iron transport and disease.
Knock-in
Knock-in of tagged iron transporters (e.g., GFP-FhuA) enables live-cell imaging and localization studies in bacteria and mammalian cells.
Overexpression
Overexpression of iron transporters like ZIP14 in cell lines can model iron overload and study downstream effects on metabolism and signaling.
How EDITGENE Supports iron ion transmembrane transporter activity Research
Researchers studying iron ion transmembrane transporter activity-related genes often need to determine whether a candidate gene is causally involved in iron transport, disease progression, or cellular stress responses. EDITGENE provides a comprehensive suite of CRISPR-based services to accelerate this research.
Contact EDITGENE today to design your custom CRISPR model for iron ion transmembrane transporter activity research.
Frequently Asked Questions About iron ion transmembrane transporter activity
What is GO:0005381?
GO:0005381 is the Gene Ontology term for iron ion transmembrane transporter activity, describing the function that moves iron ions across membranes [1,4].
What genes are involved in iron ion transmembrane transporter activity?
Key genes include SLC39A14 (ZIP14), SLC11A1, PINK1, FTH1, FTL, and bacterial transporters like IrtAB and FhuA [1,4,7,8].
How is iron ion transmembrane transporter activity regulated?
It is regulated by the IRE/IRP system, Fur in bacteria, and crosstalk with copper homeostasis [1,2,4].
What diseases are associated with iron transport dysfunction?
Cancer, diabetes mellitus, acute pancreatitis, and bacterial infections are linked to iron transport defects [1,2,3,4].
What methods are used to study iron ion transmembrane transporter activity?
CRISPR screening, cryo-EM, proteomics, fluorescent imaging, and patch-clamp are commonly used [1,4,6,7].
Can CRISPR be used to study iron transporters?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models are widely used to dissect iron transport mechanisms [1,6,7,8].
What is the role of ZIP14 in iron transport?
ZIP14 (SLC39A14) is a broad-scope metal-ion transporter that mediates cellular uptake of zinc and nontransferrin-bound iron.
How does PINK1 affect iron transport?
PINK1 deficiency leads to mitochondrial iron accumulation, which can promote colon tumorigenesis.
What is the structure of the IrtAB transporter?
Cryo-EM structures of IrtAB reveal a siderophore-binding site and an ATP-driven conformational cycle for iron import.
What services does EDITGENE offer for iron transport research?
EDITGENE provides knockout, point mutation, knock-in, overexpression cell models, CRISPR library screening, and bioinformatics services.
Conclusion
Iron ion transmembrane transporter activity (GO:0005381) is a fundamental molecular function that governs cellular iron homeostasis and is implicated in a wide range of diseases. Understanding the genes, mechanisms, and regulation of iron transporters is essential for developing new therapeutic strategies. EDITGENE's CRISPR services empower researchers to dissect these pathways with precision and scale.
References
- 1. Arcos M et al.. 2025. PINK1-deficiency facilitates mitochondrial iron accumulation and colon tumorigenesis.. Autophagy 21(4):737-753 PMID: 39512202
- 2. Lowe J et al.. 2017. Dissecting copper homeostasis in diabetes mellitus.. IUBMB Life 69(4):255-262 PMID: 28276155
- 3. Wang H et al.. 2024. Ion channels in acinar cells in acute pancreatitis: crosstalk of calcium, iron, and copper signals.. Front Immunol 15:1444272 PMID: 39606246
- 4. Sun S et al.. 2023. Cryo-EM structures for the Mycobacterium tuberculosis iron-loaded siderophore transporter IrtAB.. Protein Cell 14(6):448-458 PMID: 36882106
- 5. Yu S et al.. 2023. Down-regulation of iron/zinc ion transport and toxin synthesis in Microcystis aeruginosa exposed to 5,4'-dihydroxyflavone.. J Hazard Mater 460:132396 PMID: 37672994
- 6. Andolfo I et al.. 2023. Proteome alterations in erythrocytes with PIEZO1 gain-of-function mutations.. Blood Adv 7(12):2681-2693 PMID: 36595486
- 7. Pinilla-Tenas JJ et al.. 2011. Zip14 is a complex broad-scope metal-ion transporter whose functional properties support roles in the cellular uptake of zinc and nontransferrin-bound iron.. Am J Physiol Cell Physiol 301(4):C862-71 PMID: 21653899
- 8. Sauer DF et al.. 2023. FhuA: From Iron-Transporting Transmembrane Protein to Versatile Scaffolds through Protein Engineering.. Acc Chem Res 56(12):1433-1444 PMID: 37191525
