GO:0140983 calcium:manganese antiporter activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0140983 describes calcium:manganese antiporter activity, a molecular function that catalyzes the exchange of calcium (Ca2+) and manganese (Mn2+) ions across membranes.
• The human Golgi protein TMEM165 is a well-characterized calcium/manganese antiporter that transports both ions in yeast and bacterial cells.
• TMEM165 functions as a calcium/manganese-proton antiporter, linking Ca2+/Mn2+ homeostasis to Golgi glycosylation and cellular stress responses.
• Dysregulation of calcium and manganese transport is implicated in viral recombination, reverse transcription inhibition, and fungal stress signaling.
• Studying GO:0140983 requires tools such as ion-selective electrodes, fluorescent indicators, and CRISPR-based gene editing to dissect transporter function.
• CRISPR knockout, knock-in, and overexpression models enable causal interrogation of genes encoding calcium:manganese antiporters in human disease contexts.
Description
Calcium:manganese antiporter activity (GO:0140983) is a molecular function that mediates the exchange of calcium ions (Ca2+) and manganese ions (Mn2+) across biological membranes. This antiport activity is critical for maintaining intracellular ion homeostasis, which influences diverse cellular processes including protein glycosylation, signal transduction, and stress responses. The reaction catalyzed is Ca2+(in) + Mn2+(out) = Ca2+(out) + Mn2+(in), as defined by the Gene Ontology Consortium. Researchers study this activity to understand how cells balance calcium and manganese levels, and how disruptions contribute to disease. The Golgi-resident protein TMEM165 is a prototypical calcium/manganese antiporter that has been functionally characterized in yeast and bacterial systems, providing a model for mechanistic studies. Additionally, calcium/manganese transport is exploited by viruses and fungi, underscoring its broad biological significance. This article synthesizes current knowledge on GO:0140983, covering its mechanism, key genes, disease relevance, and experimental approaches for investigation.
calcium:manganese antiporter activity At A Glance
| GO ID | GO:0140983 |
|---|---|
| GO term | calcium:manganese antiporter activity |
| Ontology | molecular_function |
| Synonym | manganese:calcium antiporter activity |
| Definition | Catalysis of the reaction: Ca2+(in) + Mn2+(out) = Ca2+(out) + Mn2+(in). |
| Major function | Exchanges calcium and manganese ions across cellular membranes to maintain ion homeostasis. |
| Representative protein | TMEM165 (Golgi calcium/manganese-proton antiporter). |
| Cellular context | Golgi apparatus, plasma membrane, and other organellar membranes. |
| Related processes | Glycosylation, viral recombination, reverse transcription, fungal stress signaling. |
What Is GO:0140983?
Calcium:manganese antiporter activity (GO:0140983) is defined as the catalysis of the reaction: Ca2+(in) + Mn2+(out) = Ca2+(out) + Mn2+(in). In other words, it is a secondary active transport process that couples the movement of calcium into the cell (or organelle) with the movement of manganese out, and vice versa, across a lipid bilayer. This activity is distinct from simple ion channels or ATP-driven pumps because it uses the electrochemical gradient of one ion to drive the transport of the other.
Why Is calcium:manganese antiporter activity Important in Cell Biology?
Calcium:manganese antiporter activity is essential for cellular ion homeostasis, influencing processes from protein glycosylation to viral replication and fungal stress adaptation. Dysregulation of this activity can lead to glycosylation defects, altered viral recombination, and impaired reverse transcription, highlighting its broad impact on cell physiology and disease. Understanding GO:0140983 provides insights into fundamental transport mechanisms and potential therapeutic targets.
• Maintains Golgi calcium and manganese homeostasis required for proper glycosylation.
• TMEM165 mutations cause congenital disorders of glycosylation, linking antiport activity to human disease.
• Manganese transport influences reverse transcription fidelity and viral recombination.
• Calcium/manganese antiporters are exploited by plant, insect, and fungal RNA viruses for recombination.
• Fungal CrzA signaling responds to calcium and alkaline-pH stress, involving manganese homeostasis.
• Provides a target for understanding metal ion-related cytotoxicity and neurodegeneration.
• Enables development of calcium-ion batteries through biomimetic materials.
• Offers a model for studying secondary active transport mechanisms.
• Potential role in cancer via altered metal ion homeostasis (inferred from TMEM165 function).
• Facilitates yeast and bacterial complementation assays for transporter discovery.
What Happens During calcium:manganese antiporter activity?
Substrate Binding and Ion Exchange
In simple terms: The antiporter grabs a calcium ion on one side and a manganese ion on the other, then swaps them.
The antiporter binds Ca2+ and Mn2+ at opposite faces of the membrane. The reaction proceeds as Ca2+(in) + Mn2+(out) = Ca2+(out) + Mn2+(in), indicating a strict 1:1 exchange. This exchange is driven by the electrochemical gradients of the ions, without direct ATP hydrolysis.
Conformational Changes
In simple terms: The protein changes shape to move the ions across the membrane.
Ion exchange requires conformational transitions between outward-facing and inward-facing states. For TMEM165, this is coupled to proton antiport, suggesting a conserved alternating-access mechanism.
Role in Golgi Homeostasis
In simple terms: In the Golgi, this antiporter keeps calcium and manganese levels balanced for sugar modification of proteins.
TMEM165 localizes to the Golgi and regulates luminal Ca2+ and Mn2+ concentrations, which are cofactors for glycosyltransferases. Loss of TMEM165 leads to glycosylation defects, demonstrating the antiporter's role in Golgi function.
Impact on Cellular Stress Responses
In simple terms: When ion balance is disturbed, cells trigger stress signals.
In Aspergillus nidulans, calcium and alkaline-pH stress regulate CrzA nuclear trafficking, implicating calcium/manganese homeostasis in stress adaptation. Similarly, elevated manganese inhibits reverse transcription in vivo, linking ion transport to viral replication.
Key Genes Involved in GO:0140983 calcium:manganese antiporter activity
The following genes and proteins are directly or indirectly associated with calcium:manganese antiporter activity (GO:0140983), based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| TMEM165 | Golgi calcium/manganese-proton antiporter | Mutations cause glycosylation disorders; model for antiport mechanism. |
| CrzA | Transcription factor responding to calcium/alkaline-pH stress | Links ion homeostasis to fungal stress signaling. |
| Viral RNA-dependent RNA polymerase | Reverse transcription and recombination | Manganese concentration affects reverse transcription fidelity. |
| Calcium/manganese oxide (material) | Cathode material for calcium-ion batteries | Biomimetic inspiration from biological antiport. |
| Glycosyltransferases | Enzymes requiring Ca2+/Mn2+ cofactors | Downstream effectors of TMEM165 function. |
| Proton antiporters | Couple H+ gradients to Ca2+/Mn2+ exchange | Mechanistic parallels with TMEM165. |
| Yeast PMR1 | Golgi Ca2+/Mn2+ pump | Functional complementation with TMEM165. |
| Bacterial transporters | Calcium/manganese efflux | Heterologous expression systems for TMEM165. |
| Ca2+ channels | Calcium influx | Provide substrate for antiporters. |
| Mn2+ transporters | Manganese uptake | Regulate cytoplasmic Mn2+ available for antiport. |
| SLC30A10 | Manganese exporter | Manganese homeostasis linked to antiport activity. |
| SLC39A8 | Manganese importer | Affects manganese availability for antiport. |
| ATP2C1 | Golgi Ca2+/Mn2+ pump | Maintains Golgi ion gradients for antiporters. |
| CALM1 | Calmodulin, calcium sensor | Regulates calcium-dependent processes. |
| CRZ1 | Fungal calcineurin-responsive zinc finger | Homolog of CrzA in yeast. |
| PMR1 | Yeast Golgi Ca2+/Mn2+ ATPase | Model for Golgi ion homeostasis. |
| VTC2 | Vacuolar transporter chaperone | Polyphosphate metabolism linked to manganese. |
| NRAMP1 | Natural resistance-associated macrophage protein | Manganese transport in macrophages. |
How Is calcium:manganese antiporter activity Regulated?
Calcium:manganese antiporter activity is regulated at multiple levels. In Aspergillus nidulans, the transcription factor CrzA undergoes phospho-regulation and nucleocytoplasmic trafficking in response to calcium and alkaline-pH stress, indirectly influencing ion homeostasis. In humans, TMEM165 expression and localization are tied to Golgi function, and its activity is coupled to proton gradients. Elevated manganese concentrations can inhibit reverse transcription, suggesting feedback regulation by ion levels. However, direct regulatory mechanisms specific to GO:0140983 remain incompletely understood.
calcium:manganese antiporter activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| TMEM165 | Congenital disorders of glycosylation | Knockout HEK293 cells; glycosylation profiling. |
| CrzA | Fungal stress response | Aspergillus nidulans knockout; stress assays. |
| Viral RdRp | Viral recombination | In vitro reverse transcription with varying Mn2+. |
| SLC30A10 | Manganese neurotoxicity | Knockout neurons; manganese sensitivity. |
| ATP2C1 | Hailey-Hailey disease | Keratinocyte knockout; calcium imaging. |
Congenital Disorders of Glycosylation
Mutations in TMEM165, a Golgi calcium/manganese antiporter, cause congenital disorders of glycosylation (CDG), characterized by defective protein glycosylation. This links GO:0140983 directly to a human genetic disease.
Viral Replication and Recombination
Intracellular Ca2+/Mn2+ pump activity influences interviral recombination between plant, insect, and fungal RNA viruses. Elevated manganese inhibits reverse transcription in vivo, affecting retroviral replication.
Fungal Stress Signaling
In Aspergillus nidulans, calcium and alkaline-pH stress regulate CrzA, a transcription factor involved in stress responses. This implicates calcium/manganese antiport in fungal adaptation and potential antifungal targets.
Neurodegeneration and Metal Toxicity
Manganese dyshomeostasis is associated with neurotoxicity, and antiporters like TMEM165 may modulate manganese accumulation. However, direct evidence for GO:0140983 in neurodegeneration is limited.
From calcium:manganese antiporter activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does TMEM165 loss alter Golgi calcium/manganese? | TMEM165 knockout HeLa cells. |
| Can TMEM165 complement yeast PMR1 mutants? | Yeast complementation assay. |
| How does manganese affect reverse transcription? | In vitro reverse transcription with Mn2+. |
| Does CrzA regulate calcium stress genes? | Aspergillus nidulans crzA deletion. |
| Can calcium/manganese antiport be measured in bacteria? | Heterologous expression in E. coli. |
| Does TMEM165 overexpression affect glycosylation? | TMEM165 overexpression in HEK293. |
How to Study the calcium:manganese antiporter activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Ion-selective electrodes | Ca2+/Mn2+ concentrations | Real-time transport assays. |
| Fluorescent indicators | Intracellular Ca2+ dynamics | Live-cell imaging. |
| Yeast complementation | Functional rescue of PMR1 mutants | Heterologous expression. |
| Lectin blotting | Glycosylation status | TMEM165 loss-of-function. |
| CRISPR knockout screen | Gene essentiality under ion stress | Identify novel antiport regulators. |
| Reverse transcription assays | Mn2+ effect on cDNA synthesis | Viral replication studies. |
| qPCR | Gene expression changes | Stress response in fungi. |
| Mass spectrometry | Glycan structures | CDG diagnosis. |
Ion Flux Measurements
Calcium and manganese transport can be measured using ion-selective electrodes, fluorescent indicators (e.g., Fura-2 for Ca2+), or radiotracers. These methods quantify antiport activity in real time.
Complementation Assays
Yeast or bacterial mutants lacking endogenous transporters can be complemented with candidate genes to test antiport function. TMEM165 was validated this way.
Glycosylation Profiling
Since TMEM165 affects Golgi glycosylation, lectin blotting or mass spectrometry of glycans can indirectly assess antiport activity.
CRISPR Screening
Genome-wide CRISPR knockout libraries can identify genes that modulate calcium/manganese sensitivity, revealing novel components of GO:0140983.
How CRISPR Can Be Used to Study GO:0140983 calcium:manganese antiporter activity
Knockout
CRISPR knockout of TMEM165 in human cell lines abolishes calcium/manganese antiport, leading to Golgi glycosylation defects. This model helps establish causality between GO:0140983 and cellular phenotypes.
Point Mutation
Introducing point mutations in TMEM165 (e.g., patient-derived missense mutations) can dissect residues critical for ion binding and transport, linking genotype to function.
Knock-in
Knock-in of tagged TMEM165 (e.g., GFP) allows live-cell imaging of antiporter localization and dynamics in the Golgi.
Overexpression
Overexpression of TMEM165 or other candidate antiporters can enhance transport activity, enabling biochemical purification and structural studies.
How EDITGENE Supports calcium:manganese antiporter activity Research
Researchers studying calcium:manganese antiporter activity-related genes often need to determine whether a candidate gene is causally involved in ion transport, glycosylation, or disease. EDITGENE provides comprehensive CRISPR services to accelerate this discovery.
Contact EDITGENE today to design your custom CRISPR model for calcium:manganese antiporter activity research.
Frequently Asked Questions About calcium:manganese antiporter activity
What is calcium:manganese antiporter activity?
It is a molecular function (GO:0140983) that catalyzes the exchange of calcium and manganese ions across membranes.
What genes are involved in calcium:manganese antiporter activity?
TMEM165 is a key human gene; other genes include CrzA in fungi and viral RNA polymerases.
What diseases are linked to calcium:manganese antiporter activity?
Mutations in TMEM165 cause congenital disorders of glycosylation; manganese dysregulation affects viral replication and neurotoxicity.
How is calcium:manganese antiporter activity measured?
Using ion-selective electrodes, fluorescent indicators, and yeast complementation assays.
What is the role of TMEM165 in the Golgi?
TMEM165 transports calcium and manganese into the Golgi, supporting glycosylation.
Can CRISPR be used to study calcium:manganese antiporter activity?
Yes, CRISPR knockout, knock-in, and overexpression models enable functional studies.
What is the reaction catalyzed by GO:0140983?
Ca2+(in) + Mn2+(out) = Ca2+(out) + Mn2+(in).
Is calcium:manganese antiporter activity found in viruses?
Viral recombination involves intracellular Ca2+/Mn2+ pumps, indirectly linking to this activity.
How does manganese affect reverse transcription?
Elevated manganese inhibits reverse transcription in vivo.
What model organisms are used to study calcium:manganese antiporters?
Yeast, bacteria, Aspergillus nidulans, and human cell lines.
Conclusion
Calcium:manganese antiporter activity (GO:0140983) is a fundamental molecular function that maintains ion homeostasis and impacts glycosylation, viral replication, and stress signaling. TMEM165 serves as a key human model, with mutations linked to congenital disorders of glycosylation. Continued research using CRISPR and advanced transport assays will uncover new therapeutic opportunities.
References
- 1. Jankauskas SS et al.. 2024. Insights into molecular and cellular functions of the Golgi calcium/manganese-proton antiporter TMEM165.. J Biol Chem 300(8):107567 PMID: 39002685
- 2. Chando PA et al.. 2023. Exploring Calcium Manganese Oxide as a Promising Cathode Material for Calcium-Ion Batteries.. Chem Mater 35(20):8371-8381 PMID: 37901147
- 3. Stribny J et al.. 2020. The human Golgi protein TMEM165 transports calcium and manganese in yeast and bacterial cells.. J Biol Chem 295(12):3865-3874 PMID: 32047108
- 4. Kovalev N et al.. 2019. Interviral Recombination between Plant, Insect, and Fungal RNA Viruses: Role of the Intracellular Ca(2+)/Mn(2+) Pump.. J Virol 94(1) PMID: 31597780
- 5. Bolton EC et al.. 2002. Inhibition of reverse transcription in vivo by elevated manganese ion concentration.. Mol Cell 9(4):879-89 PMID: 11983178
- 6. Hernández-Ortiz P et al.. 2013. Phospho-regulation and nucleocytoplasmic trafficking of CrzA in response to calcium and alkaline-pH stress in Aspergillus nidulans.. Mol Microbiol 89(3):532-51 PMID: 23772954
