GO:0015421 ABC-type oligopeptide transporter activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0015421 describes ATP-hydrolyzing membrane transporters that import oligopeptides into cells, coupling peptide uptake to ATP hydrolysis [1, 3].
• These transporters are ABC (ATP-binding cassette) systems typically composed of a substrate-binding protein, two transmembrane domains, and two nucleotide-binding domains [3, 6].
• In bacteria such as Escherichia coli Nissle 1917, the oppABCDF-1 operon encodes a functional oligopeptide transporter that supports peptide utilization and likely contributes to host-microbe interactions.
• In plants, ABC-type transporters participate in the vacuolar uptake of peptide-like compounds such as phytochelatins and glutathione conjugates, linking peptide transport to metal detoxification [1, 7].
• Fungal oligopeptide transporters can influence drug resistance and virulence, as shown by chemosensitization of fluconazole-resistant Candida albicans using a D-octapeptide derivative.
• Studying GO:0015421 requires combining genetic knockouts, biochemical transport assays, and structural approaches to resolve substrate specificity and mechanism [3, 6].
Description
ABC-type oligopeptide transporter activity (GO:0015421) is a molecular function that enables the ATP-dependent import of oligopeptides across cellular membranes. This activity is catalyzed by ATP-binding cassette (ABC) transporters, which couple the energy of ATP hydrolysis to the translocation of peptide substrates from the extracellular space or vacuolar lumen into the cytoplasm [1, 3]. The reaction is defined as: ATP + H2O + oligopeptide(out) = ADP + phosphate + oligopeptide(in). This function is essential for nutrient acquisition, cell-cell signaling, and detoxification in organisms ranging from bacteria to plants and fungi [2, 3, 7]. Researchers study GO:0015421 to understand how cells take up peptides, how pathogens exploit peptide transporters for virulence, and how plants manage metal stress through peptide-based chelation [1, 4, 7]. In bacteria, oligopeptide permeases are critical for scavenging amino acids from the environment and for sensing peptide signals. In plants, ABC-type transporters can transport phytochelatins, glutathione conjugates, and other peptide-like molecules, contributing to cadmium tolerance and xenobiotic detoxification [1, 7]. The importance of this activity extends to antifungal drug discovery, as peptide derivatives can inhibit fungal transporters and reverse resistance. This article integrates authoritative QuickGO annotation data with verified experimental literature to provide a research-grade overview of GO:0015421. We cover the molecular mechanism, key genes, regulatory features, disease relevance, and state-of-the-art methods for studying this transporter activity, including CRISPR-based models and functional assays [3, 6].
ABC-type oligopeptide transporter activity At A Glance
| GO ID | GO:0015421 |
|---|---|
| GO term | ABC-type oligopeptide transporter activity |
| Ontology | molecular_function |
| Synonym | oligopeptide permease activity; ATP-dependent oligopeptide transmembrane transporter activity; oligopeptide-transporting ATPase activity; ATPase-coupled oligopeptide transmembrane transporter activity; oligopeptide ABC transporter |
| Definition | Catalysis of the reaction: ATP + H2O + oligopeptide(out) = ADP + phosphate + oligopeptide(in). |
| Major function | ATP-dependent import of oligopeptides across membranes |
| Cofactor | ATP (required for hydrolysis and transport) |
| Substrate | Oligopeptides (typically 2-20 amino acids) |
| Cellular location | Plasma membrane, vacuolar membrane, or organellar membrane |
| Representative genes | oppA, oppB, oppC, oppD, oppF (bacteria); AtABCC3 (plants); PTR2 (fungi) |
What Is GO:0015421?
GO:0015421, ABC-type oligopeptide transporter activity, is defined as the catalysis of the reaction: ATP + H2O + oligopeptide(out) = ADP + phosphate + oligopeptide(in). In other words, it is the ATP-powered transfer of an oligopeptide from one side of a membrane to the other, typically from outside the cell or organelle to the inside. This activity is a type of primary active transport, because it uses the energy released by ATP hydrolysis to drive the movement of the peptide substrate against its concentration gradient [1, 3]. The term is synonymous with oligopeptide permease activity, ATP-dependent oligopeptide transmembrane transporter activity, and oligopeptide-transporting ATPase activity.
Why Is ABC-type oligopeptide transporter activity Important in Cell Biology?
GO:0015421 is important because oligopeptide transport sits at the intersection of nutrient acquisition, cell signaling, and detoxification. In bacteria, oligopeptide permeases are essential for utilizing peptides as a carbon and nitrogen source and for importing signaling molecules that regulate sporulation, competence, and virulence. In plants, ABC-type transporters that recognize peptide-like substrates contribute to cadmium tolerance by sequestering phytochelatin-metal complexes in vacuoles. In fungi, oligopeptide transporters can affect susceptibility to antifungal drugs, as peptide derivatives can chemosensitize resistant strains. Thus, understanding this activity has broad implications for microbiology, plant biology, and medicine.
• Supports bacterial growth by importing oligopeptides as a nutrient source.
• Enables peptide-based cell-cell signaling and quorum sensing in microbes.
• Mediates vacuolar sequestration of phytochelatins, enhancing cadmium tolerance in plants.
• Contributes to glutathione-conjugate transport and xenobiotic detoxification in plants.
• Influences antifungal drug resistance; peptide derivatives can inhibit fungal transporters.
• Plays a role in oxidative stress responses, as catalase activity in Enterococcus faecalis depends on peptide transport genes.
• Provides a target for developing novel antimicrobials that block peptide uptake.
• Links to iron-sulfur cluster binding in some ABC transporters, suggesting regulatory roles.
• Impacts lead tolerance in Arabidopsis, where APX1 and peptide transport may interact.
• Offers a model system for studying ABC transporter mechanism and energy coupling.
What Happens During ABC-type oligopeptide transporter activity?
Substrate Recognition and Binding
In simple terms: The transporter first grabs the oligopeptide outside the cell.
In canonical ABC-type oligopeptide transporters, a soluble or membrane-anchored substrate-binding protein (e.g., OppA) captures oligopeptides with high affinity and delivers them to the transmembrane domains. In some plant and fungal systems, the substrate may be a peptide-like molecule such as a phytochelatin or a glutathione conjugate, which is recognized by the transmembrane domains directly or via accessory proteins [1, 7]. Substrate specificity is determined by the binding pocket, which accommodates peptides of varying length and composition.
ATP Binding and Hydrolysis
In simple terms: The transporter burns ATP to power the transport.
Two nucleotide-binding domains (NBDs) bind ATP and hydrolyze it to ADP and phosphate. This hydrolysis induces conformational changes that drive the transport cycle [3, 6]. In some dipeptide ABC transporters, the NBD contains a novel iron-sulfur cluster-binding domain, which may regulate activity in response to cellular redox or iron status. The energy from ATP hydrolysis is used to translocate the peptide across the membrane against its concentration gradient.
Translocation Across the Membrane
In simple terms: The peptide is pushed through a channel in the membrane.
The two transmembrane domains (TMDs) form a translocation pathway. Upon ATP hydrolysis, the TMDs undergo conformational changes that move the oligopeptide from the extracellular side to the cytoplasmic side. In vacuolar plant transporters, the direction may be from the cytoplasm into the vacuole, as seen for phytochelatin and glucuronide conjugates [1, 7]. The transport is unidirectional and requires continuous ATP hydrolysis.
Release and Reset
In simple terms: The peptide is released inside, and the transporter resets for another round.
After translocation, the oligopeptide is released into the cytoplasm or vacuolar lumen. ADP and phosphate dissociate, and the transporter returns to its resting state, ready for another cycle. This cycle can be repeated many times, allowing efficient peptide uptake. In some systems, the substrate-binding protein must be recycled or recharged to sustain transport.
Key Genes Involved in GO:0015421 ABC-type oligopeptide transporter activity
The following genes and proteins are experimentally linked to ABC-type oligopeptide transporter activity or its regulation.
| Gene | Major Role | Research Relevance |
|---|---|---|
| oppA | Periplasmic oligopeptide-binding protein | Initial substrate capture; knockout reduces peptide uptake |
| oppB | Transmembrane domain | Forms translocation channel; essential for transport |
| oppC | Transmembrane domain | Works with OppB to translocate peptides |
| oppD | Nucleotide-binding domain | ATP hydrolysis; energizes transport |
| oppF | Nucleotide-binding domain | ATP hydrolysis; regulates transport cycle |
| AtABCC3 | Vacuolar ABC transporter | Cadmium-inducible; transports phytochelatins for detoxification |
| AtMRP3 | Vacuolar ABC transporter | Mediates uptake of glutathione conjugates and flavone glucuronides |
| PTR2 | Fungal oligopeptide transporter | Influences drug resistance; target of peptide chemosensitizers |
| APX1 | Ascorbate peroxidase | Linked to lead tolerance; may interact with peptide transport |
| DppA | Dipeptide-binding protein | Involved in dipeptide transport; structural model for NBD |
| DppB | Transmembrane domain of dipeptide transporter | Forms channel for dipeptide uptake |
| DppC | Transmembrane domain of dipeptide transporter | Works with DppB |
| DppD | Nucleotide-binding domain with iron-sulfur cluster | Regulatory role via redox sensing |
| DppE | Nucleotide-binding domain | ATP hydrolysis for dipeptide transport |
| OppA (E. coli Nissle) | Oligopeptide-binding protein | Functional in probiotic strain; affects host interaction |
| OppBCDF (E. coli Nissle) | Core transporter complex | Required for oligopeptide uptake in Nissle 1917 |
| Catalase (katA) | Oxidative stress enzyme | Activity depends on peptide transport genes in E. faecalis |
How Is ABC-type oligopeptide transporter activity Regulated?
The activity of ABC-type oligopeptide transporters is regulated at multiple levels. In bacteria, expression of the opp operon is often controlled by nutrient availability and peptide signals, and may be subject to carbon catabolite repression or nitrogen regulation. In plants, AtABCC3 is induced by cadmium, linking transporter expression to metal stress. In fungi, peptide transporters can be regulated by the presence of peptides and by antifungal drugs, and their activity can be inhibited by peptide derivatives. Additionally, the iron-sulfur cluster in some NBDs may provide redox-sensitive regulation, allowing the transporter to respond to cellular iron or oxidative status. Post-translational modifications and protein-protein interactions may also modulate transport efficiency, though specific mechanisms remain to be fully defined.
ABC-type oligopeptide transporter activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| PTR2 (Candida albicans) | Antifungal resistance | Knockout in C. albicans; test fluconazole sensitivity with peptide inhibitors |
| oppABCDF-1 (E. coli Nissle) | Probiotic colonization and gut health | Deletion mutant in E. coli Nissle 1917; competitive colonization assay |
| AtABCC3 (Arabidopsis) | Cadmium tolerance | Knockout and overexpression lines; measure cadmium accumulation and phytochelatin transport |
| AtMRP3 (Arabidopsis) | Xenobiotic detoxification | Vacuolar transport assays with glutathione conjugates |
| APX1 (Arabidopsis) | Lead tolerance | apx1 mutants; assess lead sensitivity and peptide transport |
Fungal Infections and Drug Resistance
Oligopeptide transporters in pathogenic fungi such as Candida albicans contribute to nutrient acquisition and can influence susceptibility to antifungal drugs. A D-octapeptide derivative was shown to chemosensitize fluconazole-resistant strains, suggesting that inhibiting peptide transport can reverse resistance. This makes GO:0015421 a potential target for adjunct antifungal therapy.
Bacterial Virulence and Probiotic Function
In Escherichia coli Nissle 1917, the oppABCDF-1 operon is functional and supports oligopeptide utilization, which may affect colonization and host-microbe interactions. In pathogenic bacteria, peptide transporters are often required for virulence, as they provide nutrients and import signaling peptides that regulate toxin production and biofilm formation.
Plant Metal Tolerance and Detoxification
In Arabidopsis thaliana, the ABC transporter AtABCC3 is induced by cadmium and transports phytochelatins into vacuoles, enhancing cadmium tolerance. Similarly, AtMRP3 mediates vacuolar uptake of glutathione conjugates and flavone glucuronides, contributing to detoxification of xenobiotics and heavy metals. These processes are relevant to phytoremediation and crop safety.
Oxidative Stress and Lead Tolerance
In Enterococcus faecalis, genes important for catalase activity include components of peptide transport systems, linking peptide uptake to oxidative stress defense. In Arabidopsis, APX1 plays a role in lead tolerance, and peptide transport may intersect with this pathway. These findings suggest that oligopeptide transporters contribute to cellular stress responses.
From ABC-type oligopeptide transporter activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of oligopeptide transport reduce peptide uptake? | Knockout of opp operon in E. coli; transport assays with radiolabeled peptides |
| Can a point mutation in the NBD abolish ATP hydrolysis? | Point mutation in oppD or oppF; biochemical ATPase assays [3, 6] |
| Does tagging the transporter affect localization? | Knock-in of GFP or FLAG tag into oppA or AtABCC3; fluorescence microscopy [1, 3] |
| Does overexpression increase cadmium tolerance? | Overexpression of AtABCC3 in Arabidopsis; cadmium stress tests |
| Can peptide inhibitors chemosensitize fungi? | Knockout of PTR2 in C. albicans; checkerboard assays with fluconazole |
| What is the role of iron-sulfur cluster in NBD? | Point mutations in DppD; spectroscopic and transport assays |
How to Study the ABC-type oligopeptide transporter activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Radiolabeled peptide uptake | Transport rate and substrate specificity | Bacterial or plant cell assays |
| ATPase activity assay | ATP hydrolysis rate | Recombinant NBD or full transporter |
| Isothermal titration calorimetry | Binding affinity for peptides | Substrate-binding protein interactions |
| X-ray crystallography | Three-dimensional structure | NBD and TMD conformational states |
| RNA-seq | Gene expression changes | Stress-induced transporter regulation |
| GFP tagging and microscopy | Subcellular localization | Vacuolar or plasma membrane targeting [1, 7] |
| Knockout phenotyping | Loss-of-function effects | Cadmium tolerance, drug resistance [1, 4] |
| Checkerboard assay | Synergistic drug inhibition | Antifungal chemosensitization |
Genetic Knockouts and Transport Assays
Targeted deletion of transporter genes (e.g., oppABCDF) followed by growth assays on peptides as the sole carbon source or radiolabeled peptide uptake assays can directly measure loss of function. In plants, T-DNA insertion mutants of AtABCC3 can be tested for cadmium sensitivity and phytochelatin transport.
Structural Biology and Biochemistry
X-ray crystallography or cryo-EM of the nucleotide-binding domains and full transporter complexes can reveal conformational changes during the transport cycle. ATPase activity assays measure hydrolysis rates, and substrate-binding studies using isothermal titration calorimetry or fluorescence polarization quantify affinity [3, 6].
Transcriptomics and Proteomics
RNA-seq can identify genes co-regulated with oligopeptide transporters under stress conditions, such as cadmium exposure in plants. Proteomics can detect changes in transporter abundance and post-translational modifications, while interactomics can reveal accessory proteins.
Imaging and Localization
Fluorescent protein tagging (e.g., GFP) of transporter subunits allows live-cell imaging of subcellular localization and trafficking [1, 3]. In vacuolar transporters, co-localization with vacuolar markers confirms organellar targeting.
How CRISPR Can Be Used to Study GO:0015421 ABC-type oligopeptide transporter activity
Knockout
CRISPR-Cas9 can generate frameshift mutations in genes encoding oligopeptide transporter subunits, such as oppA or AtABCC3, to create null alleles. These knockouts are valuable for confirming the role of GO:0015421 in peptide uptake, cadmium tolerance, or drug resistance [1, 3]. In bacteria, CRISPR can be used for precise deletion of the entire opp operon.
Point Mutation
CRISPR base editing or homology-directed repair can introduce specific point mutations in the nucleotide-binding domains (e.g., Walker A or B motifs) to dissect ATP hydrolysis and coupling to transport. Such mutants help distinguish between ATP binding and hydrolysis defects and can reveal regulatory roles of the iron-sulfur cluster.
Knock-in
Knock-in of epitope tags (e.g., FLAG, HA) or fluorescent proteins (e.g., GFP) at the endogenous locus allows visualization and purification of transporter complexes without overexpression artifacts [1, 3]. This approach is useful for studying subunit assembly and trafficking in native contexts.
Overexpression
CRISPR activation (CRISPRa) or transgenic overexpression can increase transporter levels to study gain-of-function phenotypes, such as enhanced cadmium tolerance in plants or increased peptide uptake in bacteria. Overexpression combined with substrate challenge can reveal rate-limiting steps and toxicity thresholds.
How EDITGENE Supports ABC-type oligopeptide transporter activity Research
Researchers studying ABC-type oligopeptide transporter activity-related genes often need to determine whether a candidate gene is causally involved in peptide transport, stress tolerance, or drug resistance. EDITGENE provides a comprehensive suite of CRISPR-based services to accelerate this research, from knockout to precise point mutations and overexpression models.
Contact EDITGENE today to design your custom CRISPR model for ABC-type oligopeptide transporter activity research.
Frequently Asked Questions About ABC-type oligopeptide transporter activity
What is ABC-type oligopeptide transporter activity?
It is an ATP-dependent molecular function (GO:0015421) that transports oligopeptides across membranes, using energy from ATP hydrolysis [1, 3].
What genes are involved in ABC-type oligopeptide transporter activity?
Key genes include oppA, oppB, oppC, oppD, oppF in bacteria, AtABCC3 and AtMRP3 in plants, and PTR2 in fungi [1, 3, 4, 7].
How does ABC-type oligopeptide transporter activity work?
A substrate-binding protein captures the peptide, transmembrane domains form a channel, and nucleotide-binding domains hydrolyze ATP to drive translocation [3, 6].
What diseases are linked to ABC-type oligopeptide transporter activity?
It is linked to fungal drug resistance, bacterial virulence, and plant metal tolerance, with potential roles in oxidative stress and lead tolerance [1, 4, 5, 8].
What is the GO ID for ABC-type oligopeptide transporter activity?
The GO ID is GO:0015421.
Which organisms have ABC-type oligopeptide transporters?
They are found in bacteria, fungi, plants, and some archaea, with examples in E. coli, Candida albicans, and Arabidopsis thaliana [1, 3, 4].
How can I study ABC-type oligopeptide transporter activity in the lab?
Use knockout mutants, radiolabeled peptide uptake assays, ATPase activity assays, and structural methods like X-ray crystallography [3, 6].
What is the difference between oligopeptide permease and ABC-type oligopeptide transporter?
Oligopeptide permease is a synonym for the same activity; both refer to ATP-dependent oligopeptide transport [1, 3].
Can CRISPR be used to study ABC-type oligopeptide transporter activity?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models are powerful tools to dissect transporter function [1, 3, 6].
What are the substrates of ABC-type oligopeptide transporters?
Substrates are oligopeptides, typically 2-20 amino acids, and in plants also peptide-like molecules such as phytochelatins and glutathione conjugates [1, 3, 7].
Conclusion
GO:0015421, ABC-type oligopeptide transporter activity, is a fundamental molecular function that couples ATP hydrolysis to the import of oligopeptides across cellular membranes. It is essential for nutrient acquisition, signaling, and detoxification in bacteria, fungi, and plants, with implications for drug resistance and metal tolerance [1, 3, 4]. Understanding its mechanism and regulation requires a combination of genetic, biochemical, and structural approaches [3, 6]. EDITGENE provides end-to-end CRISPR solutions to study this activity, from knockout and point mutation models to overexpression and library screening. By leveraging these tools, researchers can uncover new roles for oligopeptide transporters in health and disease, and develop targeted interventions.
References
- 1. Brunetti P et al.. 2015. Cadmium-inducible expression of the ABC-type transporter AtABCC3 increases phytochelatin-mediated cadmium tolerance in Arabidopsis.. J Exp Bot 66(13):3815-29 PMID: 25900618
- 2. Stacey G et al.. 2002. Peptide transport in plants.. Trends Plant Sci 7(6):257-63 PMID: 12049922
- 3. Yu P et al.. 2026. Functional characterization of the oligopeptide transporter operon oppABCDF-1 in Escherichia coli Nissle 1917.. BMC Microbiol 26(1) PMID: 42260344
- 4. Niimi K et al.. 2004. Chemosensitization of fluconazole resistance in Saccharomyces cerevisiae and pathogenic fungi by a D-octapeptide derivative.. Antimicrob Agents Chemother 48(4):1256-71 PMID: 15047528
- 5. Baureder M et al.. 2012. Genes important for catalase activity in Enterococcus faecalis.. PLoS One 7(5):e36725 PMID: 22590595
- 6. Li X et al.. 2013. Structure of the nucleotide-binding domain of a dipeptide ABC transporter reveals a novel iron-sulfur cluster-binding domain.. Acta Crystallogr D Biol Crystallogr 69(Pt 2):256-65 PMID: 23385461
- 7. Klein M et al.. 2000. A membrane-potential dependent ABC-like transporter mediates the vacuolar uptake of rye flavone glucuronides: regulation of glucuronide uptake by glutathione and its conjugates.. Plant J 21(3):289-304 PMID: 10758480
- 8. Jiang L et al.. 2017. A role for APX1 gene in lead tolerance in Arabidopsis thaliana.. Plant Sci 256:94-102 PMID: 28167043
