GO:0015867 ATP transport: Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0015867 ATP transport describes the directed movement of adenosine triphosphate (ATP) into, out of, or within a cell, or between cells, via transporters or pores.
• ATP transport is mediated by diverse protein families, most prominently ATP-binding cassette (ABC) transporters, which couple ATP hydrolysis to substrate translocation.
• The mitochondrial ADP/ATP carrier (SLC25A4/ANT1) catalyzes the exchange of cytosolic ADP for mitochondrial ATP, a central step in cellular energy metabolism.
• ABC transporters can also transport ATP itself or ATP-dependent substrates, and their dysfunction is linked to multidrug resistance and inherited diseases.
• Energy-coupling factor (ECF) transporters are a distinct class of ATP-binding cassette systems that import micronutrients in bacteria, highlighting the evolutionary diversity of ATP transport.
• Studying ATP transport requires integrating structural biology, biochemical assays, and CRISPR-based genetic models to dissect transporter function and regulation.
Description
ATP transport (GO:0015867) is the biological process by which adenosine triphosphate, the universal energy currency of the cell, is moved across membranes or between cellular compartments by dedicated transporters or pores. This process is essential for maintaining energy homeostasis, fueling biosynthetic reactions, and supporting signal transduction. The directed movement of ATP is not passive; it often requires specialized protein machinery, such as ATP-binding cassette (ABC) transporters, which hydrolyze ATP to drive substrate translocation. Understanding ATP transport is therefore fundamental to cell biology, microbiology, and medicine. The origin and diversification of mitochondria, which rely on ATP/ADP exchange across their inner membrane, underscore the ancient evolutionary roots of ATP transport mechanisms. In eukaryotic cells, the mitochondrial ADP/ATP carrier (AAC) is one of the most abundant inner membrane proteins and catalyzes the strict exchange of ADP and ATP, a process critical for oxidative phosphorylation. Beyond mitochondria, ABC transporters that transport ATP or ATP-dependent substrates play key roles in detoxification, nutrient uptake, and drug resistance. Energy-coupling factor (ECF) transporters represent a unique family of ATP-binding cassette systems that mediate micronutrient uptake in bacteria, further illustrating the mechanistic diversity of ATP transport. For researchers, GO:0015867 provides a framework to annotate genes and proteins involved in these processes, enabling functional genomics, structural studies, and therapeutic targeting.
ATP transport At A Glance
| GO ID | GO:0015867 |
|---|---|
| GO term | ATP transport |
| Ontology | biological_process |
| Synonym | none |
| Major function | Directed movement of ATP across membranes or between cellular compartments via transporters or pores |
| Definition source | QuickGO |
| Related molecular functions | ATP transmembrane transporter activity, ATPase-coupled transmembrane transporter activity |
| Related cellular components | Mitochondrial inner membrane, plasma membrane, ABC transporter complex |
| Representative genes | SLC25A4, ABCC1, ABCB1, LmrA, BacA, EcfA |
What Is GO:0015867?
According to the Gene Ontology, ATP transport (GO:0015867) is defined as the directed movement of ATP, adenosine triphosphate, into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore. This definition encompasses both membrane transport and intracellular translocation of ATP, and it requires the involvement of a protein machinery component, distinguishing it from passive diffusion. The term is a biological process and does not include ATP synthesis or hydrolysis per se, but rather the movement of the intact molecule.
Why Is ATP transport Important in Cell Biology?
ATP transport is vital for cellular energy distribution, metabolic regulation, and survival. In eukaryotic cells, the mitochondrial ADP/ATP carrier (SLC25A4) exchanges cytosolic ADP for mitochondrial ATP, a process that directly links oxidative phosphorylation to cytosolic energy demands. In bacteria, ATP-binding cassette (ABC) transporters mediate the uptake of essential nutrients and the export of toxins, often using ATP hydrolysis as an energy source. Dysregulation of ATP transport contributes to a wide range of diseases, including cancer, where multidrug resistance proteins such as MRP1 (ABCC1) pump chemotherapeutic agents out of cells in an ATP-dependent manner. Moreover, mutations in mitochondrial carriers cause neuromuscular and metabolic disorders, highlighting the clinical importance of ATP transport. Understanding the molecular mechanisms of ATP transport is therefore crucial for developing targeted therapies and for interpreting genomic data in the context of cellular energetics.
• Maintains cellular energy homeostasis by distributing ATP between compartments.
• Enables oxidative phosphorylation by exchanging mitochondrial ATP with cytosolic ADP.
• Mediates multidrug resistance in cancer through ATP-dependent efflux pumps like MRP1/ABCC1.
• Supports bacterial nutrient uptake and virulence via ABC and ECF transporters.
• Provides targets for antibiotics and chemosensitizing agents.
• Links to mitochondrial diseases and neurodegeneration when carriers are mutated.
• Facilitates ATP-dependent signaling and extracellular ATP functions.
• Serves as a model for studying membrane protein structure and mechanism.
• Enables functional annotation of genes in genome-wide studies.
• Informs synthetic biology and metabolic engineering by controlling ATP fluxes.
What Happens During ATP transport?
Substrate recognition and binding
In simple terms: The transporter first grabs the ATP molecule it needs to move.
ATP transport begins with the specific recognition and binding of ATP (or its precursors such as ADP) by the transporter. For the mitochondrial ADP/ATP carrier (SLC25A4), the protein binds ADP from the cytosol and ATP from the matrix with high specificity, undergoing conformational changes that allow alternating access. ABC transporters, such as MRP1 (ABCC1), bind ATP in their nucleotide-binding domains (NBDs), which dimerize upon ATP binding and energize substrate translocation. In ECF transporters, the substrate-binding subunit (EcfS) captures the substrate, while the ATPase module (EcfA/EcfA') hydrolyzes ATP to drive transport. This step ensures that only the correct molecule is transported, maintaining cellular fidelity.
Conformational cycling and translocation
In simple terms: The transporter changes shape to push ATP across the membrane.
After binding, the transporter undergoes a series of conformational changes that move ATP across the lipid bilayer or between compartments. The mitochondrial ADP/ATP carrier operates via an alternating access mechanism, where the protein switches between a cytoplasmic-open and a matrix-open state, exchanging ADP for ATP. ABC transporters utilize the energy of ATP hydrolysis to drive a cycle of dimerization and dissociation of their NBDs, which is transmitted to the transmembrane domains, resulting in substrate translocation. The mycobacterial ABC transporter BacA uses ATP hydrolysis to transport cobalamin bidirectionally, demonstrating that some transporters can move substrates in both directions. These dynamic movements are tightly regulated to prevent futile cycling.
Energy coupling and regulation
In simple terms: The cell controls when and how much ATP is moved.
ATP transport is energetically coupled to ATP hydrolysis in ABC transporters, ensuring that transport is unidirectional and can occur against concentration gradients. In the mitochondrial ADP/ATP carrier, transport is driven by the electrochemical gradient and the concentration differences of ADP and ATP across the inner membrane, without direct ATP hydrolysis. The activity of these transporters is regulated by factors such as the proton motive force, membrane potential, and post-translational modifications. For example, the FA-cycling hypothesis proposes that fatty acid cycling modulates the proton transport mechanism of the ADP/ATP carrier. In bacteria, ECF transporters are regulated by the availability of micronutrients and the expression of their substrate-binding subunits. This regulation ensures that ATP transport meets cellular demands.
Release and recycling
In simple terms: Once across, the ATP is released and the transporter resets.
Following translocation, ATP is released on the other side of the membrane, and the transporter returns to its initial state to begin a new cycle. For the ADP/ATP carrier, ATP is released into the cytosol, while ADP is released into the mitochondrial matrix, completing the exchange. ABC transporters release their substrate after ATP hydrolysis, and the hydrolysis products (ADP and inorganic phosphate) dissociate, allowing the NBDs to separate and the transporter to reset. In ECF transporters, the substrate is released into the cytoplasm, and the EcfS subunit may be recycled or degraded. This step is crucial for maintaining continuous transport and preventing accumulation of the transporter in an inactive state.
Key Genes Involved in GO:0015867 ATP transport
The following genes and proteins are representative of the molecular machinery that mediates ATP transport (GO:0015867) across different organisms and cellular compartments.
| Gene | Major Role | Research Relevance |
|---|---|---|
| SLC25A4 (ANT1) | Mitochondrial ADP/ATP carrier; exchanges cytosolic ADP for mitochondrial ATP | Mutations cause mitochondrial DNA instability and neuromuscular disorders; target for metabolic studies |
| SLC25A5 (ANT2) | Mitochondrial ADP/ATP carrier isoform; maintains energy homeostasis | Highly expressed in proliferating cells; potential cancer target |
| ABCC1 (MRP1) | ATP-dependent efflux pump for glutathione S-conjugates and drugs | Mediates multidrug resistance in cancer; studied for chemosensitization |
| ABCB1 (MDR1/P-gp) | ATP-dependent efflux pump for xenobiotics and drugs | Major determinant of drug resistance; structural model for ABC transporters |
| BacA | Mycobacterial ABC transporter that bidirectionally transports cobalamin using ATP | Model for understanding ATP-driven transport in bacteria; potential drug target |
| EcfA | ATPase subunit of ECF transporters; hydrolyzes ATP to drive micronutrient uptake | Target for antibacterial development; model for energy coupling |
| EcfA' | ATPase subunit of ECF transporters; forms complex with EcfA | Essential for ECF transporter function; studied for mechanism |
| EcfS | Substrate-binding subunit of ECF transporters | Determines substrate specificity; potential for engineering |
| LmrA | Bacterial ABC transporter that exports drugs using ATP | Homolog of human P-glycoprotein; model for multidrug resistance |
| CFTR | ABC transporter that functions as a chloride channel; ATP transport not primary | Mutations cause cystic fibrosis; ATP-binding regulates gating |
| SUR1 (ABCC8) | ABC transporter that regulates ATP-sensitive potassium channels | Mutations cause neonatal diabetes; ATP transport role in channel regulation |
| MRP2 (ABCC2) | Apical isoform of MRP1; ATP-dependent transport of conjugates | Involved in bile secretion and drug disposition |
| VDAC1 | Mitochondrial outer membrane channel that transports ATP and other metabolites | Regulates mitochondrial ATP flux; implicated in apoptosis |
| ANT (AAC) family | Mitochondrial carriers that exchange ADP/ATP | Evolutionarily conserved; key to mitochondrial bioenergetics |
| ABCG2 (BCRP) | ATP-binding cassette transporter; effluxes drugs and toxins | Mediates multidrug resistance in cancer stem cells |
| PstB | ABC transporter ATPase involved in phosphate uptake | Model for ATP-driven transport in bacteria |
| MalK | ABC transporter ATPase for maltose uptake | Classic model for ABC transporter mechanism |
| HisP | ABC transporter ATPase for histidine uptake | Studied for energy coupling and transport |
How Is ATP transport Regulated?
ATP transport is regulated at multiple levels to match cellular energy demands. The mitochondrial ADP/ATP carrier (SLC25A4) is regulated by the proton motive force, membrane potential, and the availability of ADP and ATP. Post-translational modifications, such as acetylation and phosphorylation, can modulate carrier activity. In ABC transporters, ATP hydrolysis is tightly coupled to substrate binding, and the activity can be regulated by the expression levels of the transporter and its accessory proteins. For example, the multidrug resistance protein MRP1 (ABCC1) is regulated by phosphorylation and by the availability of glutathione. In bacteria, ECF transporters are regulated by the expression of their substrate-binding subunits and by the cellular demand for micronutrients. Additionally, the FA-cycling hypothesis suggests that fatty acids can modulate the proton transport mechanism of the ADP/ATP carrier, providing a link between lipid metabolism and ATP transport. These regulatory mechanisms ensure that ATP transport is responsive to cellular needs and environmental cues.
ATP transport and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| SLC25A4 | Mitochondrial DNA depletion syndrome, adPEO | Knockout or point-mutation knock-in in cell lines; mitochondrial function assays |
| ABCC1 | Multidrug resistance in cancer | CRISPR knockout in cancer cell lines; drug sensitivity assays |
| ABCB1 | Multidrug resistance in cancer | Overexpression and knockout models; efflux assays |
| BacA | Mycobacterial infection | Bacterial knockout; macrophage infection models |
| EcfA | Bacterial nutrient uptake and virulence | CRISPR interference in bacteria; growth assays |
ATP transport in cancer and multidrug resistance
ATP-dependent efflux pumps such as MRP1 (ABCC1) and P-glycoprotein (ABCB1) transport a wide range of chemotherapeutic agents out of cancer cells, leading to multidrug resistance. These transporters use ATP hydrolysis to drive drug efflux, reducing intracellular drug concentrations and limiting treatment efficacy. Overexpression of ABCC1 and ABCB1 is associated with poor prognosis in various cancers, making them attractive targets for chemosensitization strategies. Understanding the molecular mechanism of ATP transport by these pumps is essential for developing inhibitors that can restore drug sensitivity.
Mitochondrial ATP transport and metabolic disorders
Mutations in the mitochondrial ADP/ATP carrier SLC25A4 cause a spectrum of disorders, including autosomal dominant progressive external ophthalmoplegia (adPEO) and mitochondrial DNA depletion syndrome. These mutations impair the exchange of ADP and ATP across the inner mitochondrial membrane, leading to energy failure and mitochondrial dysfunction. The clinical manifestations include muscle weakness, neuropathy, and lactic acidosis, highlighting the critical role of ATP transport in human health. Studying these mutations in model systems can provide insights into disease mechanisms and potential therapies.
Bacterial ATP transport and infectious disease
Bacterial ATP-binding cassette (ABC) transporters are essential for nutrient uptake, virulence, and antibiotic resistance. For example, the mycobacterial transporter BacA uses ATP to transport cobalamin, which is required for survival within host cells. ECF transporters mediate the uptake of vitamins and trace elements, which are critical for bacterial growth and pathogenesis. Targeting these ATP transport systems is a promising strategy for developing new antibiotics, especially against multidrug-resistant pathogens.
From ATP transport-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of SLC25A4 affect mitochondrial ATP export? | SLC25A4 knockout cell line (e.g., HEK293T) |
| How do point mutations in SLC25A4 alter ADP/ATP exchange? | Knock-in of patient mutations in cell lines; Seahorse assays |
| Can ABCC1 knockout reverse drug resistance? | ABCC1 knockout in multidrug-resistant cancer cells; IC50 assays |
| What is the role of BacA in cobalamin transport? | BacA knockout in Mycobacterium; transport assays |
| How does EcfA ATPase activity drive micronutrient uptake? | EcfA point mutations in bacterial strains; ATPase assays |
| Does overexpression of ABCB1 increase drug efflux? | ABCB1 overexpression in cancer cell lines; flow cytometry |
How to Study the ATP transport Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Radiolabeled transport assay | Uptake or efflux of radioactive ATP/ADP | Measure mitochondrial ADP/ATP carrier activity |
| ATPase assay | ATP hydrolysis rate | Assess ABC transporter activity |
| Cryo-EM | Three-dimensional structure of transporter | Determine conformational states |
| CRISPR knockout screen | Gene essentiality for ATP transport | Identify novel regulators |
| Live-cell ATP imaging | Intracellular ATP dynamics | Monitor compartmental ATP changes |
| Surface plasmon resonance | Binding affinity between transporter and substrate | Characterize substrate specificity |
| Isothermal titration calorimetry | Thermodynamics of substrate binding | Quantify binding constants |
| Proteoliposome transport assay | Transport activity in defined lipid environment | Study purified transporters |
Biochemical transport assays
Biochemical assays using isolated membrane vesicles or proteoliposomes are classic methods to measure ATP transport activity. For example, the transport of radiolabeled ATP or ADP can be monitored in vesicles containing the mitochondrial ADP/ATP carrier. For ABC transporters, ATPase activity is often measured using colorimetric or fluorescent assays, and substrate transport can be assessed with fluorescent substrates. These methods provide direct kinetic parameters and are essential for validating transporter function.
Structural biology approaches
X-ray crystallography and cryo-electron microscopy (cryo-EM) have revealed the molecular architecture of ATP transporters, including the mitochondrial ADP/ATP carrier and several ABC transporters. These structures provide snapshots of different conformational states, elucidating the alternating access mechanism and the coupling of ATP hydrolysis to transport. Structural studies are complemented by molecular dynamics simulations to understand the dynamics of transport.
Genetic and genomic screens
CRISPR-Cas9 knockout screens and RNA interference (RNAi) can identify genes required for ATP transport and its regulation. For example, genome-wide screens have uncovered factors that modulate sensitivity to ATP-dependent drugs. In bacteria, transposon sequencing (Tn-seq) can identify genes essential for ATP transport under various conditions. These approaches enable unbiased discovery of new components and pathways.
Live-cell imaging and reporters
Genetically encoded ATP sensors, such as ATeam or GO-ATeam, allow real-time monitoring of ATP levels in different cellular compartments. Combined with fluorescent protein tagging of transporters, live-cell imaging can reveal the spatiotemporal dynamics of ATP transport. These techniques are powerful for studying how ATP transport responds to metabolic changes and stress.
How CRISPR Can Be Used to Study GO:0015867 ATP transport
Knockout
CRISPR-Cas9 knockout of genes involved in ATP transport, such as SLC25A4 or ABCC1, allows researchers to assess their contribution to cellular energetics and drug resistance. For example, knocking out ABCC1 in cancer cell lines can reverse multidrug resistance and increase sensitivity to chemotherapeutic agents. Knockout of SLC25A4 in cell models leads to mitochondrial dysfunction and altered ATP/ADP ratios, providing insights into its role in mitochondrial diseases.
Point Mutation
Introducing disease-associated point mutations into ATP transporter genes using CRISPR base editing or homology-directed repair (HDR) can model human disorders. For instance, knock-in of SLC25A4 mutations found in adPEO patients allows study of how specific amino acid changes affect ADP/ATP exchange. Similarly, point mutations in ABC transporter NBDs can dissect the ATP hydrolysis cycle and its coupling to transport.
Knock-in
CRISPR knock-in of reporter tags, such as GFP or HA, into endogenous ATP transporter loci enables real-time visualization and biochemical purification of the transporters. This approach preserves native regulation and allows tracking of transporter localization and dynamics. Knock-in of fluorescent ATP sensors can also be used to monitor ATP transport in specific compartments.
Overexpression
CRISPR activation (CRISPRa) or lentiviral overexpression of ATP transporters like ABCB1 can model drug resistance and study transport kinetics. Overexpression of SLC25A4 can enhance mitochondrial ATP export and alter cellular metabolism. These models are useful for screening inhibitors and understanding the consequences of transporter upregulation in diseases such as cancer.
How EDITGENE Supports ATP transport Research
Researchers studying ATP transport-related genes often need to determine whether a candidate gene is causally involved in the movement of ATP across membranes, and how mutations or expression changes contribute to disease. EDITGENE provides a comprehensive suite of CRISPR-based services to create precise cellular models for such investigations, enabling functional validation and mechanistic studies.
Contact EDITGENE today to design your custom CRISPR model for ATP transport research.
Frequently Asked Questions About ATP transport
What is ATP transport (GO:0015867)?
ATP transport is the directed movement of adenosine triphosphate (ATP) into, out of, or within a cell, or between cells, by means of a transporter or pore, as defined by the Gene Ontology.
What genes are involved in ATP transport?
Key genes include SLC25A4 (mitochondrial ADP/ATP carrier), ABCC1 (MRP1), ABCB1 (P-glycoprotein), and bacterial transporters like BacA and EcfA.
How does the mitochondrial ADP/ATP carrier work?
It exchanges cytosolic ADP for mitochondrial ATP through an alternating access mechanism, driven by the electrochemical gradient.
What diseases are linked to ATP transport defects?
Mutations in SLC25A4 cause mitochondrial DNA depletion and adPEO, while overexpression of ABCC1 and ABCB1 leads to multidrug resistance in cancer.
What methods are used to study ATP transport?
Common methods include radiolabeled transport assays, ATPase assays, cryo-EM, CRISPR screens, and live-cell ATP imaging.
Can CRISPR be used to model ATP transport diseases?
Yes, CRISPR knockout, knock-in, and point mutation models allow functional studies of ATP transporters in disease contexts.
What is the role of ABC transporters in ATP transport?
ABC transporters use ATP hydrolysis to drive substrate translocation across membranes, and some transport ATP itself or ATP-dependent substrates.
How is ATP transport regulated?
It is regulated by membrane potential, substrate availability, post-translational modifications, and expression levels of transporters.
What are ECF transporters?
Energy-coupling factor (ECF) transporters are a family of ATP-binding cassette systems that mediate micronutrient uptake in bacteria.
Why is ATP transport important for cancer?
ATP-dependent efflux pumps like MRP1 and P-glycoprotein export chemotherapeutic drugs, reducing their efficacy and causing multidrug resistance.
Conclusion
ATP transport (GO:0015867) is a fundamental biological process that ensures the proper distribution of cellular energy. From mitochondrial ADP/ATP exchange to ATP-driven efflux pumps in cancer and bacterial nutrient uptake, the mechanisms are diverse and clinically relevant. Advances in structural biology and CRISPR-based genetic models continue to unravel the molecular details of ATP transport, offering new opportunities for therapeutic intervention. Researchers can leverage these tools to dissect the roles of specific transporters in health and disease.
References
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- 3. Roger AJ et al.. 2017. The Origin and Diversification of Mitochondria.. Curr Biol 27(21):R1177-R1192 PMID: 29112874
- 4. Pohl EE et al.. 2025. Exploring the proton transport mechanism of the mitochondrial ADP/ATP carrier: FA-cycling hypothesis and beyond.. Protein Sci 34(3):e70047 PMID: 39969060
- 5. Keppler D et al.. 1998. ATP-dependent transport of glutathione S-conjugates by the multidrug resistance protein MRP1 and its apical isoform MRP2.. Chem Biol Interact 111-112:153-61 PMID: 9679551
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- 7. Nijland M et al.. 2024. Bidirectional ATP-driven transport of cobalamin by the mycobacterial ABC transporter BacA.. Nat Commun 15(1):2626 PMID: 38521790
- 8. Rempel S et al.. 2019. ECF-Type ATP-Binding Cassette Transporters.. Annu Rev Biochem 88:551-576 PMID: 30485755
