GO:0015746 citrate transport: Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0015746 citrate transport describes the directed movement of citrate across membranes or within cells by transporters or pores.
• Citrate transport is essential for kidney and intestinal citrate reabsorption, bacterial citrate utilization, and mitochondrial metabolic flux.
• Multiple transporter families mediate citrate transport, including the CitMHS family for metal-citrate complexes and mitochondrial citrate carriers.
• Dysregulated citrate transport contributes to prostate cancer, MYCN-amplified neuroblastoma, and bacterial virulence.
• Citrate transport is a emerging drug target, with inhibitors being developed for cancer and infectious diseases.
• CRISPR knockout, knock-in, and overexpression models enable causal dissection of citrate transporter genes in disease and metabolism.
Description
Citrate transport (GO:0015746) is the directed movement of citrate, 2-hydroxy-1,2,3-propanetricarboxylate, into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore. Citrate is a central metabolite in the tricarboxylic acid cycle and a key substrate for fatty acid synthesis, and its transport across cellular and organellar membranes is fundamental to energy metabolism and biosynthetic pathways. In mammalian physiology, citrate transport in the kidney and intestine is critical for systemic acid-base balance and calcium homeostasis. In bacteria, citrate transport systems enable utilization of citrate as a carbon source and contribute to host colonization. In recent years, citrate transport has gained attention as a metabolic vulnerability in cancer, particularly in prostate cancer and MYCN-amplified neuroblastoma, where altered citrate metabolism supports tumor growth. Understanding the molecular mechanisms, regulation, and disease relevance of citrate transport is therefore essential for researchers in metabolism, cancer biology, and infectious disease.
citrate transport At A Glance
| GO ID | GO:0015746 |
|---|---|
| GO term | citrate transport |
| Ontology | biological_process |
| Synonym | none |
| Major function | Directed movement of citrate across membranes or within cells via transporters or pores |
| Definition source | QuickGO |
| Related transporters | CitMHS family, mitochondrial citrate carriers, bacterial citrate transporters |
| Disease relevance | Prostate cancer, MYCN-amplified neuroblastoma, bacterial infections |
| Research methods | CRISPR KO/knock-in, metabolic flux analysis, transport assays, transcriptomics |
What Is GO:0015746?
GO:0015746 citrate transport is defined as the directed movement of citrate, 2-hydroxy-1,2,3-propanetricarboxylate, into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore. This process encompasses the translocation of citrate across biological membranes, including the plasma membrane, mitochondrial inner membrane, and bacterial cell envelope, and is mediated by specific transport proteins or channels.
Why Is citrate transport Important in Cell Biology?
Citrate transport is critical for maintaining metabolic homeostasis, as citrate is a key intermediate in the TCA cycle and a precursor for fatty acid and cholesterol synthesis. In the kidney and intestine, citrate transport regulates urinary citrate excretion and systemic acid-base balance, with implications for kidney stone formation and metabolic disorders. In bacteria, citrate transport systems are essential for carbon source utilization and contribute to virulence and biofilm formation. In cancer, altered citrate transport supports the metabolic reprogramming of prostate cancer cells and represents a metabolic liability in MYCN-amplified neuroblastoma. Moreover, citrate transport is emerging as a druggable target, with inhibitors being explored for cancer therapy and antimicrobial strategies.
• Regulates systemic citrate homeostasis and acid-base balance in kidney and intestine.
• Supports bacterial citrate utilization and contributes to host colonization and virulence.
• Enables mitochondrial citrate export for fatty acid synthesis and epigenetic regulation.
• Dysregulated in prostate cancer, where citrate metabolism is reprogrammed.
• Represents a metabolic liability in MYCN-amplified neuroblastoma.
• Target for small-molecule inhibitors in cancer and infectious diseases.
• Involved in metal-citrate complex transport, impacting metal homeostasis.
• Provides a model system for studying secondary active transport mechanisms.
• Essential for metabolic flux analysis and TCA cycle function.
• Enables CRISPR-based functional genomics of transporter genes.
What Happens During citrate transport?
Substrate recognition and binding
In simple terms: The transporter first grabs citrate from one side of the membrane.
Citrate transporters recognize citrate or metal-citrate complexes with high specificity. The CitMHS family of secondary transporters binds metal-citrate complexes, such as Mg-citrate or Ca-citrate, prior to translocation. In mammalian cells, mitochondrial citrate carriers (e.g., SLC25A1) bind citrate in the mitochondrial matrix for export to the cytosol. Substrate binding induces conformational changes that initiate the transport cycle.
Translocation across the membrane
In simple terms: The transporter changes shape to move citrate through the membrane.
Following substrate binding, the transporter undergoes a series of conformational changes that expose the substrate to the opposite side of the membrane. This process can be driven by ion gradients (secondary active transport) or by antiport mechanisms. In kidney and intestinal epithelia, sodium-dependent citrate transport couples citrate uptake to sodium gradients. In bacteria, citrate transport systems such as the CitMHS family mediate electrogenic or electroneutral exchange.
Release and reset
In simple terms: Citrate is released on the other side, and the transporter resets.
After translocation, citrate is released into the target compartment, and the transporter returns to its initial conformation to begin a new cycle. In mitochondria, citrate export is coupled to malate or other counter-ion import, maintaining metabolic balance. In Pseudomonas aeruginosa, redundancy in citrate and cis-aconitate transport ensures efficient substrate utilization even when one transporter is lost.
Integration with cellular metabolism
In simple terms: Once inside, citrate feeds into energy and biosynthesis pathways.
Transported citrate enters the TCA cycle or is used for fatty acid synthesis, cholesterol synthesis, and epigenetic regulation via acetyl-CoA production. In prostate cancer cells, citrate transport and metabolism are reprogrammed to support tumor growth, with zinc and citrate levels playing a role. In MYCN-amplified neuroblastoma, mitochondrial citrate transport represents a metabolic liability, and its inhibition impairs tumor growth.
Key Genes Involved in GO:0015746 citrate transport
The following genes and proteins are experimentally implicated in citrate transport across species, based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| SLC25A1 | Mitochondrial citrate carrier | Metabolic flux, cancer metabolism |
| SLC13A5 | Plasma membrane citrate transporter | Kidney and liver citrate transport |
| SLC13A2 | Sodium-dependent citrate transporter | Intestinal and renal citrate reabsorption |
| CitM | Bacterial metal-citrate transporter | Metal-citrate complex transport |
| CitH | Bacterial citrate transporter | Secondary transport of citrate |
| CitS | Bacterial citrate transporter | Citrate utilization in Streptococcus |
| CicA | Pseudomonas citrate transporter | Redundant citrate transport |
| CicB | Pseudomonas citrate transporter | Redundant citrate transport |
| CicC | Pseudomonas citrate transporter | Redundant citrate transport |
| CicD | Pseudomonas citrate transporter | Redundant citrate transport |
| MctC | Bacterial citrate transporter | Citrate transport in Pseudomonas |
| MctP | Bacterial citrate transporter | Citrate transport in Pseudomonas |
| SLC25A10 | Mitochondrial dicarboxylate carrier | Citrate/malate exchange |
| ACLY | ATP-citrate lyase | Cytosolic citrate metabolism |
| CS | Citrate synthase | TCA cycle citrate production |
| SLC13A1 | Sodium-dependent citrate transporter | Renal citrate transport |
| SLC13A4 | Sulfate/citrate transporter | Citrate transport in placenta |
How Is citrate transport Regulated?
Citrate transport is regulated at multiple levels. In mammalian kidney and intestine, citrate transport is influenced by acid-base status, hormones, and dietary factors. In bacteria, citrate transport systems are regulated by substrate availability and transcriptional regulators, with redundancy ensuring robust citrate utilization. In cancer cells, citrate transport is regulated by oncogenic signaling and metabolic reprogramming, including MYCN amplification in neuroblastoma. Pharmacological inhibitors targeting citrate transport are being developed, highlighting its regulatory potential.
citrate transport and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| SLC25A1 | MYCN-amplified neuroblastoma | CRISPR knockout in neuroblastoma cell lines |
| SLC13A5 | Kidney stone disease, metabolic disorders | Knockout mouse models |
| CitM | Bacterial infections | Bacterial knockout and transport assays |
| CicA | Pseudomonas aeruginosa virulence | CRISPR interference in P. aeruginosa |
| ACLY | Prostate cancer | CRISPR knockout in prostate cancer cells |
Citrate transport in prostate cancer
Prostate cancer cells exhibit altered citrate metabolism, with changes in citrate transport and accumulation. Normal prostate epithelial cells accumulate high levels of citrate, but malignant transformation is associated with decreased citrate levels and increased citrate oxidation. Targeting citrate transport and metabolism is being explored as a therapeutic strategy in prostate cancer.
Citrate transport in MYCN-amplified neuroblastoma
MYCN-amplified neuroblastoma cells depend on mitochondrial citrate transport for survival and proliferation. Inhibition of mitochondrial citrate transport represents a metabolic liability in these tumors, suggesting that targeting citrate transporters could be a therapeutic approach.
Citrate transport in bacterial infections
Bacterial citrate transport systems, such as those in Pseudomonas aeruginosa and Streptococcus diacetilactis, are essential for citrate utilization and contribute to host colonization. The CitMHS family mediates transport of metal-citrate complexes, which can impact metal homeostasis and virulence. Inhibitors of bacterial citrate transport are being investigated as antimicrobial strategies.
From citrate transport-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does SLC25A1 loss impair neuroblastoma growth? | CRISPR knockout in MYCN-amplified neuroblastoma cells |
| Does SLC13A5 mutation affect citrate reabsorption? | Point mutation knock-in in kidney cell lines |
| Can citrate transporter be tagged for localization? | Knock-in of fluorescent tag at endogenous locus |
| Does overexpression of CitM enhance metal-citrate uptake? | Overexpression in E. coli |
| What is the role of CicA in Pseudomonas citrate transport? | CRISPR knockout in P. aeruginosa |
| Does ACLY inhibition affect prostate cancer metabolism? | CRISPR knockout or inhibitor treatment |
How to Study the citrate transport Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Radiolabeled citrate uptake | Transport activity | Kidney and intestinal citrate transport |
| 13C metabolic flux analysis | Citrate metabolism and flux | Cancer metabolism |
| CRISPR knockout screening | Gene essentiality for citrate transport | Cancer and bacterial models |
| RNA-seq | Expression of citrate transporters | Regulation studies |
| Proteomics | Protein levels of transporters | Bacterial citrate transport |
| Fluorescent citrate analogs | Real-time transport | Bacterial permeabilization assays |
| Transport inhibitor assays | Inhibitor efficacy | Drug discovery |
| Site-directed mutagenesis | Functional residues | Mechanistic studies |
Transport assays
Radiolabeled or fluorescent citrate uptake assays are used to measure transport activity in cells or membrane vesicles. These assays can determine kinetics, substrate specificity, and inhibitor sensitivity.
Metabolic flux analysis
Isotope tracing with 13C-citrate or related metabolites allows quantification of citrate transport and metabolism in cells and tissues. This method is particularly useful for studying cancer metabolism and mitochondrial citrate export.
CRISPR screening
Genome-wide CRISPR knockout or activation screens can identify genes required for citrate transport and utilization. Such screens have been applied to identify metabolic liabilities in cancer and bacterial systems.
Transcriptomics and proteomics
RNA-seq and proteomics can reveal expression changes in citrate transporters under different conditions, such as acid-base stress or oncogenic transformation.
How CRISPR Can Be Used to Study GO:0015746 citrate transport
Knockout
CRISPR knockout of citrate transporter genes (e.g., SLC25A1, SLC13A5, CitM) enables loss-of-function studies to determine their role in citrate transport, metabolism, and disease. Knockout models have been used to show that mitochondrial citrate transport is a metabolic liability in MYCN-amplified neuroblastoma.
Point Mutation
CRISPR point mutation can introduce specific amino acid changes in citrate transporters to dissect substrate binding, transport kinetics, and regulation. This approach is valuable for studying transporter structure-function relationships.
Knock-in
Knock-in of tags (e.g., GFP, HA) at endogenous citrate transporter loci allows real-time localization and interaction studies. Knock-in models can also introduce disease-associated mutations for functional analysis.
Overexpression
CRISPR activation or cDNA overexpression of citrate transporters can enhance transport activity and study gain-of-function effects. Overexpression of bacterial citrate transporters has been used to study metal-citrate uptake.
How EDITGENE Supports citrate transport Research
Researchers studying citrate transport-related genes often need to determine whether a candidate gene is causally involved in citrate uptake, metabolism, or disease. EDITGENE provides comprehensive CRISPR-based services to generate knockout, point-mutation, knock-in, and overexpression cell models, as well as CRISPR library screening and bioinformatics support, enabling rigorous functional validation of citrate transport genes.
Contact EDITGENE today to design your custom CRISPR model for citrate transport research.
Related Products
| Product name | Cat.No. | Species | Gene ID | |
|---|---|---|---|---|
| SLC13A2 Knockout HEK293 Cell Line | EDJ-KQ6447 | Human | 9058 | Details Get a Quote |
| SFXN5 Knockout HEK293 Cell Line | EDJ-KQ11285 | Human | 94097 | Details Get a Quote |
| SLC13A3 Knockout HEK293 Cell Line | EDJ-KQ14507 | Human | 64849 | Details Get a Quote |
| SLC13A5 Knockout HEK293 Cell Line | EDJ-KQ15296 | Human | 284111 | Details Get a Quote |
| SLC35G1 Knockout HEK293 Cell Line | EDJ-KQ15334 | Human | 159371 | Details Get a Quote |
| SLC35G1 Knockout A-549 Cell Line | EDJ-KQ46055 | Human | 159371 | Details Get a Quote |
| SLC35G1 Knockout HCT 116 Cell Line | EDJ-KQ46056 | Human | 159371 | Details Get a Quote |
| SLC35G1 Knockout HeLa Cell Line | EDJ-KQ46057 | Human | 159371 | Details Get a Quote |
| SFXN5 Knockout A-549 Cell Line | EDJ-KQ39395 | Human | 94097 | Details Get a Quote |
| SFXN5 Knockout HCT 116 Cell Line | EDJ-KQ39396 | Human | 94097 | Details Get a Quote |
| SFXN5 Knockout HeLa Cell Line | EDJ-KQ39397 | Human | 94097 | Details Get a Quote |
| SLC13A2 Knockout HeLa Cell Line | EDJ-KQ55068 | Human | 9058 | Details Get a Quote |
| SLC13A3 Knockout HeLa Cell Line | EDJ-KQ57087 | Human | 64849 | Details Get a Quote |
| SLC13A5 Knockout HeLa Cell Line | EDJ-KQ59437 | Human | 284111 | Details Get a Quote |
| SLC13A2 Knockout A-549 Cell Line | EDJ-KQ63550 | Human | 9058 | Details Get a Quote |
Displaying Records 1 To 15 Of 22 Records
Frequently Asked Questions About citrate transport
What is citrate transport?
Citrate transport (GO:0015746) is the directed movement of citrate across cellular membranes or within cells by transporters or pores.
What genes are involved in citrate transport?
Key genes include SLC25A1, SLC13A5, SLC13A2, CitM, CitH, and CicA, among others.
How is citrate transport regulated?
Citrate transport is regulated by acid-base status, hormones, substrate availability, and oncogenic signaling.
What diseases are associated with citrate transport?
Prostate cancer, MYCN-amplified neuroblastoma, and bacterial infections are linked to altered citrate transport.
What is the role of SLC25A1 in citrate transport?
SLC25A1 is a mitochondrial citrate carrier that exports citrate from mitochondria for cytosolic metabolism.
How can I study citrate transport using CRISPR?
CRISPR knockout, knock-in, and overexpression models can be used to dissect citrate transporter function.
What methods measure citrate transport?
Radiolabeled uptake assays, metabolic flux analysis, and CRISPR screens are commonly used.
Is citrate transport a drug target?
Yes, inhibitors targeting citrate transport are being developed for cancer and infectious diseases.
What is the CitMHS family?
The CitMHS family comprises secondary transporters that mediate metal-citrate complex transport in bacteria.
Why is citrate transport important in cancer?
Altered citrate transport supports metabolic reprogramming in prostate cancer and neuroblastoma.
Conclusion
Citrate transport (GO:0015746) is a fundamental biological process that governs citrate movement across membranes, impacting metabolism, physiology, and disease. From kidney and intestinal citrate reabsorption to bacterial citrate utilization and cancer metabolic reprogramming, citrate transporters play diverse and critical roles. Emerging evidence highlights citrate transport as a therapeutic target in prostate cancer, MYCN-amplified neuroblastoma, and bacterial infections. CRISPR-based functional genomics, combined with metabolic and transport assays, provides powerful tools to dissect the molecular mechanisms and disease relevance of citrate transport. EDITGENE offers comprehensive CRISPR services to accelerate research in this field.
References
- 1. Pajor AM. 1999. Citrate transport by the kidney and intestine.. Semin Nephrol 19(2):195-200 PMID: 10192253
- 2. Underhill SAM et al.. 2022. Redundancy in Citrate and cis-Aconitate Transport in Pseudomonas aeruginosa.. J Bacteriol 204(12):e0028422 PMID: 36321838
- 3. Lensbouer JJ et al.. 2010. Secondary transport of metal-citrate complexes: the CitMHS family.. Crit Rev Biochem Mol Biol 45(5):453-62 PMID: 20735204
- 4. Mycielska ME et al.. 2009. Citrate transport and metabolism in mammalian cells: prostate epithelial cells and prostate cancer.. Bioessays 31(1):10-20 PMID: 19153992
- 5. Zhang L et al.. 2023. Opportunities and Challenges for Inhibitors Targeting Citrate Transport and Metabolism in Drug Discovery.. J Med Chem 66(14):9229-9250 PMID: 37428122
- 6. Chen C et al.. 2026. Mitochondrial citrate transport represents a metabolic liability in MYCN-amplified neuroblastoma.. Mol Ther 34(4):2482-2495 PMID: 41485048
- 7. Helander IM et al.. 2000. Fluorometric assessment of gram-negative bacterial permeabilization.. J Appl Microbiol 88(2):213-9 PMID: 10735988
- 8. HARVEY RJ et al.. 1962. Citrate transport system of Streptococcus diacetilactis.. J Bacteriol 83(5):1005-9 PMID: 13905110
