GO:0097197 tetraspanin-enriched microdomain: Components, Assembly and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0097197 tetraspanin-enriched microdomain (TEM) is a pre-organized plasma membrane unit built from tetraspanins, integrins, immunoglobulin superfamily proteins and signaling receptors.
• TEMs compartmentalize adhesion, signaling and enzymatic activities, regulating receptor avidity and membrane organization.
• Core tetraspanins such as CD9, CD151, CD63, CD81 and TSPAN8 are the principal structural organizers of TEMs.
• TEMs are implicated in viral entry and exit, bacterial invasion, cancer progression and migrasome formation.
• CRISPR knockout, knock-in and overexpression models enable causal dissection of TEM components in human cells.
• TEM research combines imaging, proteomics, CRISPR screening and bioinformatics to map composition and function.
Description
Tetraspanin-enriched microdomains (TEMs), defined by GO:0097197, are specialized plasma membrane domains that concentrate tetraspanin proteins together with adhesion molecules, signaling receptors and enzymes. These domains are not mere lipid rafts; they are pre-organized units that regulate the avidity of adhesion receptors and compartmentalize enzymatic activities at the cell surface. TEMs have emerged as key organizers of membrane biology, influencing processes as diverse as cell migration, viral entry, bacterial invasion and cancer progression. Because TEMs assemble from multiple protein families, their study requires integrated structural, biochemical and genetic approaches. This article summarizes the current understanding of TEM composition, assembly, regulation and disease relevance, and outlines how CRISPR-based models can be used to interrogate TEM components.
tetraspanin-enriched microdomain At A Glance
| GO ID | GO:0097197 |
|---|---|
| GO term | tetraspanin-enriched microdomain |
| Ontology | cellular_component |
| Synonym | membrane tetraspanin-enriched microdomain; TEM |
| Major function | Compartmentalization of adhesion, signaling and enzymatic activities at the plasma membrane |
| Key components | Tetraspanins (CD9, CD151, CD63, CD81, TSPAN8), integrins, Ig superfamily proteins, signaling receptors |
| Assembly principle | Tetraspanin-tetraspanin and tetraspanin-partner interactions create a pre-organized platform |
| Disease relevance | Cancer progression, viral entry, bacterial invasion, migrasome biology |
What Is GO:0097197?
GO:0097197 tetraspanin-enriched microdomain is a cellular component defined as a pre-organized unit composed of adhesion molecules (mainly integrins and members of the Ig superfamily), signaling receptors and/or enzyme-enriched plasma membrane domains that compartmentalizes cellular processes. TEMs are especially suited for regulating the avidity of adhesion receptors and for compartmentalizing enzymatic activities.
Why Is tetraspanin-enriched microdomain Important in Cell Biology?
TEMs are important because they provide a mechanistic framework for understanding how cells organize their plasma membrane to control adhesion, signaling and enzymatic reactions. Dysregulation of TEM components is linked to cancer progression, infectious disease entry and other pathological processes. Studying TEMs therefore offers insights into fundamental cell biology and potential therapeutic targets.
• TEMs regulate integrin-dependent adhesion and signaling, influencing cell migration and invasion.
• They serve as entry platforms for respiratory viruses including SARS-CoV-2.
• They facilitate bacterial invasion, as shown for Salmonella enterica via CD81.
• TEM components are implicated in hepatocellular carcinoma progression.
• They are building blocks of migrasomes, organelles involved in cell-cell communication.
• Tetraspanin CD63 in TEMs controls trafficking and function of associated proteins.
• TEMs compartmentalize enzymatic activities, affecting signaling output.
• They are conserved in plants, indicating broad biological significance.
• TEMs regulate digitation junctions, specialized adhesion structures.
• They provide a target for therapeutic intervention in cancer and infectious diseases.
Structure and Composition of tetraspanin-enriched microdomain
Tetraspanin scaffolds
In simple terms: Tetraspanins are the main building blocks that hold the microdomain together.
Tetraspanins such as CD9, CD151, CD63, CD81 and TSPAN8 are four-transmembrane proteins that self-associate and interact with partner proteins to form the core scaffold of TEMs. Structural studies of CD9 with EWI-F provide insights into how tetraspanins assemble into microdomains.
Integrin and Ig superfamily partners
In simple terms: Adhesion molecules like integrins and Ig proteins are recruited into the microdomain.
TEMs recruit adhesion molecules, mainly integrins and members of the immunoglobulin superfamily, which are key for cell adhesion and recognition. These interactions regulate avidity and signaling.
Signaling receptors and enzymes
In simple terms: Signaling receptors and enzymes are concentrated in TEMs to coordinate cellular responses.
TEMs compartmentalize signaling receptors and enzymatic activities, allowing efficient and localized signal transduction. This organization is critical for processes such as cell migration and invasion.
Assembly and dynamics
In simple terms: TEMs are pre-organized but dynamic structures that can change composition.
TEM assembly is driven by tetraspanin-tetraspanin and tetraspanin-partner interactions, forming pre-organized units at the plasma membrane. Their dynamics are linked to functions such as migrasome formation and digitation junction regulation.
Key Genes Involved in GO:0097197 tetraspanin-enriched microdomain
The following genes encode core tetraspanins and associated proteins that define or interact with tetraspanin-enriched microdomains.
| Gene | Major Role | Research Relevance |
|---|---|---|
| CD9 | Core tetraspanin; structural organizer of TEMs | Viral entry, cancer, structural studies |
| CD151 | Tetraspanin; regulates integrin-dependent adhesion | Cancer progression, viral entry |
| CD63 | Tetraspanin; trafficking and signaling | Lysosomal trafficking, viral entry |
| CD81 | Tetraspanin; receptor scaffolding | Bacterial invasion, viral entry |
| TSPAN8 | Tetraspanin; cell migration and metastasis | Cancer progression, viral entry |
| ITGB1 | Integrin beta-1; adhesion receptor | TEM partner, cancer |
| ITGA3 | Integrin alpha-3; adhesion receptor | TEM partner, cancer |
| ITGA6 | Integrin alpha-6; adhesion receptor | TEM partner, cancer |
| EWI-F | Ig superfamily protein; CD9 partner | Structural studies of TEM assembly |
| CD9P-1 | Ig superfamily protein; CD9 partner | TEM assembly |
| TSPAN1 | Tetraspanin; plant and animal TEMs | Plant TEM functions |
| TSPAN2 | Tetraspanin; plant and animal TEMs | Plant TEM functions |
| TSPAN3 | Tetraspanin; plant and animal TEMs | Plant TEM functions |
| TSPAN4 | Tetraspanin; migrasome formation | Migrasome biology |
| TSPAN7 | Tetraspanin; neuronal functions | TEM in neurons |
| TSPAN9 | Tetraspanin; platelet function | TEM in platelets |
| TSPAN12 | Tetraspanin; Wnt signaling | TEM in development |
| TSPAN15 | Tetraspanin; cancer | TEM in cancer |
How Is tetraspanin-enriched microdomain Regulated?
TEM assembly and function are regulated by tetraspanin expression levels, post-translational modifications and interactions with partner proteins. Palmitoylation of tetraspanins is important for their association with other proteins and for TEM integrity. Additionally, the composition of TEMs can be modulated by cellular activation and pathological conditions, as seen in viral infection and cancer.
tetraspanin-enriched microdomain and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| CD151 | Cancer progression, viral entry | Knockout in cancer cell lines |
| CD81 | Salmonella invasion | Knockout in epithelial cells |
| CD9 | Viral entry, cancer | Overexpression in HEK293 |
| TSPAN8 | Cancer metastasis | Knockdown in cancer cells |
| CD63 | Trafficking disorders | Knockout in HeLa |
Cancer progression
TEMs and their tetraspanin components are implicated in hepatocellular carcinoma progression, where they influence adhesion, migration and invasion. Tetraspanins such as CD151 and TSPAN8 are associated with metastatic potential.
Viral entry and exit
TEMs containing CD151, CD9 and TSPAN8 are potential mediators of entry and exit for respiratory viruses including SARS-CoV-2. These microdomains may facilitate viral attachment and budding.
Bacterial invasion
Human tetraspanin CD81 in TEMs facilitates invasion of Salmonella enterica into human epithelial cells, highlighting a role in bacterial pathogenesis.
Migrasome biology
TEMs are building blocks of migrasomes, which are involved in cell-cell communication and may play roles in development and disease.
From tetraspanin-enriched microdomain-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of CD9 affect TEM assembly? | CD9 knockout cells |
| Does CD81 facilitate Salmonella entry? | CD81 knockout epithelial cells |
| Can CD151 point mutations disrupt integrin binding? | Point-mutation knock-in |
| Does TSPAN8 overexpression promote migration? | Overexpression in cancer cells |
| How does CD63 trafficking depend on TEM? | Tagged knock-in of CD63 |
| What is the role of TSPAN4 in migrasomes? | Knockout in migrasome-forming cells |
How to Study the tetraspanin-enriched microdomain Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Co-immunoprecipitation | Protein-protein interactions | Identifying TEM components |
| Super-resolution microscopy | Nanoscale localization | Visualizing TEM assembly |
| CRISPR knockout screens | Gene essentiality | Finding TEM regulators |
| Proteomics | Protein composition | Mapping TEM interactome |
| Flow cytometry | Surface expression | Quantifying tetraspanins |
| Migration assays | Cell motility | Assessing TEM function |
| Viral entry assays | Infection efficiency | Testing TEM role in viral entry |
| Bacterial invasion assays | Invasion efficiency | Testing CD81 function |
Imaging TEMs
Fluorescence microscopy and super-resolution imaging can visualize TEM components and their co-localization at the plasma membrane.
Proteomic analysis
Mass spectrometry-based proteomics can identify proteins associated with tetraspanin complexes, revealing TEM composition.
CRISPR screening
Genome-wide CRISPR knockout screens can identify genes required for TEM-dependent processes such as viral entry or bacterial invasion.
Functional assays
Adhesion, migration and invasion assays can measure the functional consequences of TEM disruption.
How CRISPR Can Be Used to Study GO:0097197 tetraspanin-enriched microdomain
Knockout
CRISPR knockout of tetraspanin genes such as CD9, CD81 or CD151 can disrupt TEM assembly and function, enabling studies of their role in adhesion, migration and infection.
Point Mutation
Point mutations can be introduced into tetraspanin genes to dissect specific interaction domains, such as those required for integrin binding or palmitoylation.
Knock-in
Knock-in of tagged tetraspanins (e.g., GFP or HA) allows visualization and purification of TEM components for biochemical and imaging studies.
Overexpression
Overexpression of tetraspanins like TSPAN8 or CD151 can enhance TEM formation and promote phenotypes such as increased migration or viral entry.
How EDITGENE Supports tetraspanin-enriched microdomain Research
Researchers studying tetraspanin-enriched microdomain-related genes often need to determine whether a candidate gene is causally involved in TEM assembly, function or disease. EDITGENE provides a comprehensive suite of CRISPR services to enable such investigations.
Contact EDITGENE today to design your custom CRISPR model for tetraspanin-enriched microdomain research.
Frequently Asked Questions About tetraspanin-enriched microdomain
What is a tetraspanin-enriched microdomain?
A tetraspanin-enriched microdomain (TEM) is a pre-organized plasma membrane unit composed of tetraspanins, adhesion molecules, signaling receptors and enzymes that compartmentalizes cellular processes.
What genes are involved in tetraspanin-enriched microdomains?
Key genes include CD9, CD151, CD63, CD81, TSPAN8 and integrins such as ITGB1.
What is the function of GO:0097197?
GO:0097197 describes a cellular component that regulates avidity of adhesion receptors and compartmentalizes enzymatic activities.
How are tetraspanin-enriched microdomains assembled?
They assemble through tetraspanin-tetraspanin and tetraspanin-partner interactions, forming pre-organized platforms at the plasma membrane.
What diseases are associated with tetraspanin-enriched microdomains?
TEMs are linked to cancer progression, viral entry (including SARS-CoV-2), bacterial invasion and migrasome biology.
How can CRISPR be used to study tetraspanin-enriched microdomains?
CRISPR knockout, knock-in, point mutation and overexpression models allow functional dissection of TEM components.
What is the role of CD81 in tetraspanin-enriched microdomains?
CD81 facilitates Salmonella enterica invasion into epithelial cells and is a core tetraspanin in TEMs.
What is the role of CD9 in tetraspanin-enriched microdomains?
CD9 is a structural organizer of TEMs and is involved in viral entry and cancer.
What methods are used to study tetraspanin-enriched microdomains?
Methods include co-immunoprecipitation, super-resolution microscopy, proteomics, CRISPR screens and functional assays.
Why are tetraspanin-enriched microdomains important for cancer?
TEM components like CD151 and TSPAN8 promote adhesion, migration and invasion, contributing to cancer progression.
Conclusion
Tetraspanin-enriched microdomains (GO:0097197) are essential plasma membrane platforms that organize adhesion, signaling and enzymatic activities. Their roles in cancer, infection and migrasome biology make them attractive targets for basic and translational research. CRISPR-based models provide powerful tools to dissect TEM gene function and identify new therapeutic opportunities.
References
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- 2. Pols MS et al.. 2009. Trafficking and function of the tetraspanin CD63.. Exp Cell Res 315(9):1584-92 PMID: 18930046
- 3. Oosterheert W et al.. 2020. Implications for tetraspanin-enriched microdomain assembly based on structures of CD9 with EWI-F.. Life Sci Alliance 3(11) PMID: 32958604
- 4. Huang Y et al.. 2022. Tetraspanin-enriched microdomains: The building blocks of migrasomes.. Cell Insight 1(1):100003 PMID: 37192987
- 5. Reimann R et al.. 2017. TETRASPANINs in Plants.. Front Plant Sci 8:545 PMID: 28458676
- 6. Huang C et al.. 2018. Tetraspanin-enriched microdomains regulate digitation junctions.. Cell Mol Life Sci 75(18):3423-3439 PMID: 29589089
- 7. Alvarez KG et al.. 2024. Human tetraspanin CD81 facilitates invasion of Salmonella enterica into human epithelial cells.. Virulence 15(1):2399792 PMID: 39239914
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