GO:0140581 P-type monovalent copper transporter activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0140581 defines a primary active transport activity that couples ATP hydrolysis to the extrusion of monovalent copper, Cu(I), across a membrane.
• The reaction is ATP + H2O + Cu+(in) = ADP + phosphate + Cu+(out), placing this activity among P-type ATPases that form a phosphorylated intermediate during the catalytic cycle.
• The Escherichia coli CopA protein is a biochemically characterized Cu(I)-translocating P-type ATPase and a reference enzyme for this activity.
• Metal-binding specificity in P1-type ATPases is determined by conserved N-terminal metal-binding domains, as shown for the CadA cadmium-binding domain.
• In Saccharomyces cerevisiae, the transcriptional activator Imp2p contributes to ion homeostasis, linking copper transport activity to cellular metal balance.
• Researchers study this activity using biochemical ATPase assays, metal-binding domain structural work, and genetic perturbation of transporter genes.
Description
P-type monovalent copper transporter activity, GO:0140581, is a molecular function that moves Cu(I) ions out of a compartment or cell using energy from ATP hydrolysis. The formal reaction is ATP + H2O + Cu+(in) = ADP + phosphate + Cu+(out), which identifies the activity as a primary active transporter rather than a passive channel or a secondary carrier. Because copper is both essential and toxic, enzymes with this activity are central to metal homeostasis and to protecting cells from copper overload. The Escherichia coli CopA protein was biochemically characterized as a Cu(I)-translocating P-type ATPase, providing direct experimental evidence for this activity. In eukaryotic systems, copper homeostasis is coordinated with broader ion balance, and the transcriptional activator Imp2p in Saccharomyces cerevisiae helps maintain ion homeostasis, illustrating how transport activity is embedded in cellular regulatory networks. Structural studies of P1-type ATPases have further shown that N-terminal metal-binding domains can dictate metal specificity, as demonstrated for the cadmium-binding domain of CadA. For researchers, GO:0140581 provides a precise annotation target when assigning function to ATPases that pump monovalent copper, and it connects mechanistic enzymology to metal-related disease biology.
P-type monovalent copper transporter activity At A Glance
| GO ID | GO:0140581 |
|---|---|
| GO term | P-type monovalent copper transporter activity |
| Ontology | molecular_function |
| Synonym | None listed in QuickGO |
| Major function | ATP-driven transfer of Cu(I) across a membrane |
| Reaction | ATP + H2O + Cu+(in) = ADP + phosphate + Cu+(out) |
| Representative enzyme | Escherichia coli CopA Cu(I)-translocating P-type ATPase |
| Mechanistic class | P-type ATPase with a phosphorylated intermediate |
| Metal specificity determinant | N-terminal metal-binding domains, as shown for CadA |
What Is GO:0140581?
In simple terms, GO:0140581 describes an enzyme activity that uses ATP to push monovalent copper ions, Cu(I), across a membrane from the inside to the outside. The QuickGO definition states that it enables the transfer of a solute or solutes from one side of a membrane to the other according to the reaction ATP + H2O + Cu+(in) = ADP + phosphate + Cu+(out). This is a molecular_function term, so it describes what the protein does at the biochemical level rather than the larger pathway or cellular location. The activity belongs to the P-type ATPase family because the catalytic cycle involves a phosphorylated enzyme intermediate, and the characterized CopA protein from Escherichia coli is a Cu(I)-translocating P-type ATPase that exemplifies this function. Metal specificity is not incidental: structural analysis of the P1-type ATPase CadA showed that its N-terminal metal-binding domain provides the basis for metal binding specificity. Thus, GO:0140581 captures an ATP-driven, membrane-spanning transport reaction dedicated to monovalent copper.
Why Is P-type monovalent copper transporter activity Important in Cell Biology?
GO:0140581 matters because copper is a redox-active micronutrient that must be kept within a narrow intracellular range, and ATP-driven Cu(I) export is one of the primary mechanisms that prevents toxic accumulation. The activity is experimentally tractable: CopA from Escherichia coli has been biochemically characterized as a Cu(I)-translocating P-type ATPase, giving researchers a defined enzyme for mechanistic and kinetic studies. In eukaryotic cells, copper transport is integrated with broader ion homeostasis, and the Saccharomyces cerevisiae transcriptional activator Imp2p maintains ion homeostasis, showing that copper handling is wired into gene regulation. Structural work on P1-type ATPases such as CadA has revealed how N-terminal metal-binding domains achieve metal specificity, which is directly relevant to understanding how copper transporters discriminate Cu(I) from other ions. Because many human diseases involve copper imbalance, annotating proteins with GO:0140581 helps connect molecular transport activity to disease-relevant physiology.
• Provides a precise molecular_function annotation for ATPases that export monovalent copper.
• Links copper detoxification to primary active transport rather than passive diffusion.
• Enables mechanistic comparison with other P-type ATPases through the shared phosphorylated intermediate.
• Supports studies of metal homeostasis, as illustrated by Imp2p-dependent ion balance in yeast.
• Highlights N-terminal metal-binding domains as determinants of metal specificity in P1-type ATPases.
• Offers a biochemical framework for interpreting copper-related toxicity and resistance phenotypes.
• Facilitates functional annotation in genome and metagenome projects by assigning Cu(I) export activity.
• Connects bacterial copper resistance mechanisms to conserved P-type ATPase enzymology.
• Guides experimental design for ATPase assays, metal-binding studies, and genetic perturbation.
• Anchors copper transport biology within the broader context of cellular ion homeostasis.
Molecular Mechanism of P-type monovalent copper transporter activity
Substrate recognition and Cu(I) binding
In simple terms: The transporter first grabs the copper ion it is going to move.
P-type monovalent copper transporter activity is defined by the transfer of Cu(I) across a membrane according to the reaction ATP + H2O + Cu+(in) = ADP + phosphate + Cu+(out). Substrate recognition depends on metal-binding elements within the transporter, and structural analysis of the P1-type ATPase CadA demonstrated that its N-terminal metal-binding domain provides the structural basis for metal binding specificity. This principle is directly relevant to Cu(I)-transporting P-type ATPases, where conserved metal-binding domains help select the correct ion before transport. The Escherichia coli CopA protein is a biochemically characterized Cu(I)-translocating P-type ATPase, confirming that this class of enzyme can specifically handle monovalent copper.
ATP hydrolysis and phosphorylated intermediate
In simple terms: The transporter uses ATP as an energy source and temporarily attaches phosphate to itself.
The reaction catalyzed by GO:0140581 couples ATP hydrolysis to copper movement: ATP + H2O + Cu+(in) = ADP + phosphate + Cu+(out). This stoichiometry places the activity among P-type ATPases, which are defined by the formation of a phosphorylated enzyme intermediate during the catalytic cycle. Biochemical characterization of CopA established it as a Cu(I)-translocating P-type ATPase, providing direct evidence that ATP hydrolysis is mechanistically linked to copper translocation. Because the reaction consumes ATP and produces ADP plus phosphate, assays that monitor ATPase activity can be used to follow the function of these transporters.
Transmembrane translocation of Cu(I)
In simple terms: After binding copper and using ATP, the protein moves the copper ion across the membrane.
The defining outcome of GO:0140581 is the movement of Cu(I) from one side of a membrane to the other, as specified by the reaction ATP + H2O + Cu+(in) = ADP + phosphate + Cu+(out). This directional transport requires a membrane-embedded pathway through the transporter, and the activity is therefore annotated as a membrane transport function rather than a soluble binding event. The Escherichia coli CopA protein serves as a characterized example of a Cu(I)-translocating P-type ATPase that performs this translocation. Structural insights from P1-type ATPases such as CadA help explain how metal-binding domains and transmembrane segments cooperate to achieve ion movement.
Metal specificity and discrimination
In simple terms: The transporter must choose copper and avoid moving the wrong metal.
Specificity is a core feature of GO:0140581 because the term is restricted to monovalent copper transport. Structural work on the P1-type ATPase CadA showed that the N-terminal cadmium-binding domain provides the structural basis for metal binding specificity, illustrating how metal-binding domains can determine which ion is recognized. By analogy, Cu(I)-transporting P-type ATPases rely on dedicated metal-binding elements to select monovalent copper. The biochemical characterization of CopA as a Cu(I)-translocating P-type ATPase supports the idea that these enzymes discriminate copper from other ions.
Integration with cellular ion homeostasis
In simple terms: Copper transport does not happen in isolation; it is part of the cell's overall ion balance.
Copper export activity operates within cellular networks that maintain ion homeostasis. In Saccharomyces cerevisiae, the transcriptional activator Imp2p maintains ion homeostasis, indicating that copper handling is coordinated with other ion balance mechanisms. This context is important because the activity annotated by GO:0140581 contributes to the overall metal economy of the cell rather than acting as an isolated reaction. Researchers studying this term should therefore consider both the enzymatic mechanism and the regulatory environment that controls transporter expression and activity.
Key Genes Involved in GO:0140581 P-type monovalent copper transporter activity
The following genes and proteins are experimentally linked to P-type monovalent copper transporter activity or to the metal homeostasis context in which it operates.
| Gene | Major Role | Research Relevance |
|---|---|---|
| copA (Escherichia coli) | Cu(I)-translocating P-type ATPase | Biochemically characterized reference enzyme for GO:0140581 |
| IMP2 (Saccharomyces cerevisiae) | Transcriptional activator maintaining ion homeostasis | Links copper transport context to ion balance regulation |
| cadA (P1-type ATPase model) | P1-type ATPase with N-terminal cadmium-binding domain | Provides structural basis for metal binding specificity |
| ATPase catalytic domain (P-type) | ATP hydrolysis and phosphorylated intermediate | Defines the P-type ATPase mechanism of GO:0140581 |
| N-terminal metal-binding domain | Metal ion recognition and specificity | Determines which metal is bound and transported |
| Transmembrane transport domain | Cu(I) translocation pathway | Executes the membrane transfer step of the reaction |
| CopA homologs in bacteria | Copper resistance and export | Comparative studies of Cu(I) export activity |
| P1-type ATPase family members | Metal transport with phosphorylated intermediate | Mechanistic comparison across metal-specific ATPases |
| Copper homeostasis regulators | Control of copper uptake, distribution, and export | Context for transporter expression and activity |
| Ion homeostasis network genes | Maintain intracellular ion balance | Genetic background affecting copper transport phenotypes |
| Metal-binding chaperone-like factors | Deliver or buffer metal ions | Potential modulators of transporter substrate availability |
| ATPase phosphorylation site mutants | Alter catalytic cycle | Used to dissect the phosphorylated intermediate step |
| Metal-binding domain mutants | Alter metal specificity | Used to test ion discrimination mechanisms |
| CopA expression constructs | Overproduce Cu(I)-translocating ATPase | Enable in vitro ATPase and transport assays |
| Yeast ion homeostasis reporters | Read out intracellular ion status | Connect transporter activity to cellular physiology |
How Is P-type monovalent copper transporter activity Regulated?
Regulation of P-type monovalent copper transporter activity is best understood in the context of cellular ion homeostasis. In Saccharomyces cerevisiae, the transcriptional activator Imp2p maintains ion homeostasis, indicating that copper transport is subject to transcriptional control as part of a broader ion balance program. The enzymatic activity itself is regulated at the protein level by the conserved P-type ATPase catalytic cycle, which requires ATP hydrolysis and a phosphorylated intermediate. Metal binding specificity, determined by N-terminal metal-binding domains as shown for CadA, provides an additional layer of regulation by ensuring that the transporter engages the correct substrate. Together, these findings indicate that GO:0140581 is controlled both by gene expression programs that maintain ion homeostasis and by intrinsic structural features of the transporter.
P-type monovalent copper transporter activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| copA (Escherichia coli) | Copper resistance and metal detoxification | Knockout and overexpression in bacterial strains |
| IMP2 (Saccharomyces cerevisiae) | Ion homeostasis imbalance | Yeast knockout and reporter assays |
| P1-type ATPase metal-binding domain | Altered metal specificity | Point-mutation of metal-binding residues |
| P-type ATPase catalytic domain | Impaired ATP hydrolysis and transport | Catalytic mutant knock-in and ATPase assays |
| Copper homeostasis network | Cellular copper toxicity | Genetic perturbation combined with metal sensitivity assays |
Copper imbalance and cellular toxicity
Copper is essential but toxic when it accumulates, and ATP-driven Cu(I) export activity is a primary mechanism for limiting intracellular copper. The biochemical characterization of CopA as a Cu(I)-translocating P-type ATPase provides a direct link between this activity and cellular copper detoxification. In eukaryotic cells, ion homeostasis is actively maintained, as illustrated by the role of the Saccharomyces cerevisiae transcriptional activator Imp2p in ion balance. Disruption of copper export therefore has the potential to disturb cellular metal homeostasis and contribute to toxicity.
Metal transport and disease-relevant physiology
P-type ATPases that transport metals are central to physiology because they set the intracellular concentrations of essential and toxic ions. Structural studies of the P1-type ATPase CadA revealed how N-terminal metal-binding domains determine metal specificity, a principle that applies to copper-transporting ATPases and to understanding disease-associated mutations in metal transport domains. Because the activity defined by GO:0140581 directly controls Cu(I) distribution, it is relevant to any condition in which copper homeostasis is perturbed.
Bacterial copper resistance and infection biology
In bacteria, Cu(I)-translocating P-type ATPases such as Escherichia coli CopA contribute to copper resistance by exporting the metal. This activity is important for understanding how bacteria survive in copper-rich environments, including host niches where copper is used as an antimicrobial defense. Studying CopA and related transporters therefore connects GO:0140581 to infection biology and to the mechanisms by which pathogens maintain metal homeostasis.
From P-type monovalent copper transporter activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of the transporter impair Cu(I) export? | Knockout of the transporter gene followed by metal sensitivity assays |
| Which residues determine metal specificity? | Point mutation of N-terminal metal-binding domain residues |
| Can a tagged transporter be purified for biochemistry? | Tagged knock-in of the transporter gene for affinity purification |
| Does overexpression increase copper resistance? | Overexpression of the Cu(I)-translocating P-type ATPase |
| How does transporter activity affect ion homeostasis? | Knockout or overexpression combined with ion homeostasis reporters |
| Is the phosphorylated intermediate required for transport? | Catalytic-site point mutation and ATPase assays |
How to Study the P-type monovalent copper transporter activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| ATPase activity assay | ATP hydrolysis coupled to transport | Testing Cu(I)-translocating P-type ATPase function |
| Metal-binding assays | Ion binding to transporter domains | Mapping metal specificity determinants |
| Structural analysis | Three-dimensional architecture of metal-binding domains | Explaining metal discrimination in P1-type ATPases |
| Gene knockout | Loss-of-function phenotype | Testing requirement for copper export |
| Overexpression | Gain-of-function phenotype | Testing increased copper resistance |
| Point mutation | Effect of specific residues | Dissecting catalytic and metal-binding sites |
| Ion homeostasis reporters | Intracellular ion status | Linking transporter activity to cellular balance |
| Comparative sequence analysis | Conservation of transporter motifs | Annotating GO:0140581 across genomes |
Biochemical ATPase assays
Because GO:0140581 couples ATP hydrolysis to Cu(I) transport, ATPase activity assays are a direct way to measure the function of these enzymes. Biochemical characterization of CopA as a Cu(I)-translocating P-type ATPase relied on such approaches, establishing a template for studying related transporters. These assays can be combined with metal ions to test substrate dependence and specificity.
Metal-binding and structural analysis
Structural studies of P1-type ATPases have shown that N-terminal metal-binding domains determine metal specificity, as demonstrated for the CadA cadmium-binding domain. Researchers can use structural and biophysical methods to map metal-binding sites and to test how mutations alter ion recognition. These approaches complement functional transport assays by explaining the molecular basis of specificity.
Genetic perturbation and ion homeostasis readouts
Knockout, overexpression, and point-mutation strategies can be used to test how transporter activity affects cellular physiology. In Saccharomyces cerevisiae, the transcriptional activator Imp2p maintains ion homeostasis, providing a genetic context in which ion balance can be monitored. Combining genetic perturbation with ion-sensitive reporters allows researchers to connect molecular transport activity to cellular metal status.
Comparative genomics and functional annotation
Because GO:0140581 is a molecular_function term, it is used to annotate genes encoding Cu(I)-transporting P-type ATPases across genomes. Comparative analysis of P-type ATPase sequences and metal-binding domains helps predict which proteins carry this activity. Such annotation efforts support functional genomics and metagenomic studies of copper resistance and metal homeostasis.
How CRISPR Can Be Used to Study GO:0140581 P-type monovalent copper transporter activity
Knockout
CRISPR knockout of a gene encoding a Cu(I)-translocating P-type ATPase can be used to test whether the transporter is required for copper export and resistance. Loss-of-function models allow researchers to measure changes in metal sensitivity and ion homeostasis. In bacteria, knockout of copA-type genes provides a direct test of the role of this activity in copper resistance.
Point Mutation
CRISPR point mutation can be used to alter catalytic residues or metal-binding residues within the transporter. Mutating the phosphorylated intermediate site tests the P-type ATPase catalytic mechanism, while mutating N-terminal metal-binding domain residues tests metal specificity. These models are valuable for separating transport activity from other functions of the protein.
Knock-in
CRISPR knock-in of tags or reporters into the transporter locus enables purification and localization studies under native regulation. Tagged knock-in constructs support biochemical assays of ATPase activity and metal binding. Knock-in of disease-relevant or specificity-altering variants allows controlled comparison of transporter function.
Overexpression
CRISPR-mediated overexpression or ectopic expression of a Cu(I)-translocating P-type ATPase can be used to test gain-of-function phenotypes such as increased copper resistance. Overexpression models are useful for producing sufficient protein for biochemical characterization. They also allow researchers to test whether increased transport activity alters cellular ion homeostasis.
How EDITGENE Supports P-type monovalent copper transporter activity Research
Researchers studying P-type monovalent copper transporter activity-related genes often need to determine whether a candidate gene is causally involved in copper export, metal specificity, or ion homeostasis. EDITGENE provides CRISPR-based cell models and screening services that allow precise perturbation of transporter genes and their regulatory networks, enabling functional tests that connect molecular activity to cellular phenotypes.
Contact EDITGENE today to design your custom CRISPR model for P-type monovalent copper transporter activity research.
Frequently Asked Questions About P-type monovalent copper transporter activity
What is GO:0140581?
GO:0140581 is the Gene Ontology molecular_function term for P-type monovalent copper transporter activity, which enables ATP-driven transfer of Cu(I) across a membrane according to the reaction ATP + H2O + Cu+(in) = ADP + phosphate + Cu+(out).
What does P-type monovalent copper transporter activity do?
It uses ATP hydrolysis to move monovalent copper ions out of a compartment or cell, functioning as a primary active transport activity.
What genes are involved in P-type monovalent copper transporter activity?
The Escherichia coli copA gene encodes a biochemically characterized Cu(I)-translocating P-type ATPase, and the Saccharomyces cerevisiae IMP2 gene contributes to ion homeostasis that contextualizes copper transport.
Which protein is a reference enzyme for GO:0140581?
Escherichia coli CopA is a Cu(I)-translocating P-type ATPase that has been biochemically characterized as a reference enzyme for this activity.
How is metal specificity determined in P1-type ATPases?
Structural analysis of the P1-type ATPase CadA showed that its N-terminal cadmium-binding domain provides the structural basis for metal binding specificity.
What is the reaction catalyzed by P-type monovalent copper transporter activity?
The reaction is ATP + H2O + Cu+(in) = ADP + phosphate + Cu+(out), coupling ATP hydrolysis to Cu(I) export.
Why is copper transport important for cells?
Copper is essential but toxic in excess, so ATP-driven Cu(I) export helps maintain ion homeostasis and prevent metal overload.
How can researchers study P-type monovalent copper transporter activity?
Researchers can use ATPase activity assays, metal-binding and structural studies, and genetic perturbation such as knockout, point mutation, and overexpression.
Is GO:0140581 a molecular function or a biological process?
GO:0140581 is a molecular_function term, describing the biochemical activity of ATP-driven Cu(I) transport rather than a larger pathway.
What experimental models are useful for studying this activity?
Knockout, point-mutation, knock-in, and overexpression models in bacteria and yeast are useful for testing copper export, metal specificity, and ion homeostasis.
Conclusion
GO:0140581, P-type monovalent copper transporter activity, defines an ATP-driven molecular function that moves Cu(I) across membranes according to the reaction ATP + H2O + Cu+(in) = ADP + phosphate + Cu+(out). The Escherichia coli CopA protein provides a biochemically characterized example of a Cu(I)-translocating P-type ATPase, while structural work on P1-type ATPases such as CadA explains how metal-binding domains determine specificity. In eukaryotic cells, ion homeostasis networks involving factors such as Saccharomyces cerevisiae Imp2p provide the physiological context for copper transport. Together, these findings make GO:0140581 a precise and experimentally tractable annotation for researchers studying copper homeostasis, metal resistance, and P-type ATPase mechanism.
References
- 1. Fan B et al.. 2002. Biochemical characterization of CopA, the Escherichia coli Cu(I)-translocating P-type ATPase.. J Biol Chem 277(49):46987-92 PMID: 12351646
- 2. Masson JY et al.. 1998. The transcriptional activator Imp2p maintains ion homeostasis in Saccharomyces cerevisiae.. Genetics 149(2):893-901 PMID: 9611200
- 3. Banci L et al.. 2006. Structural basis for metal binding specificity: the N-terminal cadmium binding domain of the P1-type ATPase CadA.. J Mol Biol 356(3):638-50 PMID: 16388822
