GO:0098640 integrin binding involved in cell-matrix adhesion: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0098640 describes the molecular function of integrin binding that occurs specifically as part of cell-matrix adhesion, distinguishing it from generic integrin binding.
• Integrins are heterodimeric receptors that connect the extracellular matrix to the actin cytoskeleton, enabling bidirectional signaling and mechanotransduction.
• Key ligands include fibronectin, vitronectin, laminins, and collagens, each engaging distinct integrin heterodimers to control adhesion, migration, and survival.
• The term is central to mechanosensing, where forces from the matrix are converted into biochemical signals that regulate cell behavior.
• Dysregulated integrin binding contributes to cancer progression, arthritis, and fibrosis, making it a target for therapeutic intervention.
• CRISPR-based knockout, point mutation, knock-in, and overexpression models enable precise dissection of integrin binding in cell-matrix adhesion.
Description
Integrin binding involved in cell-matrix adhesion (GO:0098640) is a molecular function that defines the specific interaction between integrin receptors and their extracellular matrix (ECM) ligands during the process of cell-matrix adhesion. This term captures the binding event that is an integral part of adhesion, rather than any generic integrin-ligand interaction. It is essential for understanding how cells sense and respond to their physical environment. Integrins are heterodimeric transmembrane receptors composed of alpha and beta subunits that link the ECM to the actin cytoskeleton. Their binding to matrix proteins such as fibronectin, vitronectin, laminins, and collagens triggers conformational changes and clustering that initiate intracellular signaling cascades. This function is fundamental to diverse biological processes including embryonic development, tissue homeostasis, immune responses, and wound healing. Researchers study GO:0098640 to dissect the molecular basis of mechanotransduction, cell migration, and disease-associated adhesion defects. The term is particularly relevant in cancer biology, where altered integrin binding promotes invasion and metastasis, and in inflammatory diseases such as arthritis.
integrin binding involved in cell-matrix adhesion At A Glance
| GO ID | GO:0098640 |
|---|---|
| GO term | integrin binding involved in cell-matrix adhesion |
| Ontology | molecular_function |
| Synonym | none |
| Major function | Binding of integrin receptors to extracellular matrix ligands during cell-matrix adhesion |
| Parent term | integrin binding (GO:0005178) |
| Part of | cell-matrix adhesion (GO:0007160) |
| Related ligands | Fibronectin, vitronectin, laminins, collagens |
| Related cellular component | Integrin heterodimers, focal adhesions, actin cytoskeleton |
What Is GO:0098640?
GO:0098640 is defined as any integrin binding that occurs as part of the process of cell-matrix adhesion. In other words, it is the molecular function of an integrin receptor physically interacting with an ECM ligand specifically when that interaction contributes to the adhesion of a cell to its surrounding matrix. This definition excludes integrin binding events that are not coupled to cell-matrix adhesion, such as certain soluble ligand interactions. The term is a child of integrin binding (GO:0005178) and is part of the broader process of cell-matrix adhesion (GO:0007160). It is used in functional annotation to describe the ligand-binding activity of integrins in the context of adhesion.
Why Is integrin binding involved in cell-matrix adhesion Important in Cell Biology?
GO:0098640 is important because it defines the precise molecular event that initiates cell-matrix adhesion, a process critical for tissue architecture, cell migration, proliferation, and survival. Dysregulation of this function is implicated in cancer, fibrosis, arthritis, and developmental disorders. Understanding it at the molecular level enables the design of targeted therapies and the development of advanced cell culture models.
• Controls cell adhesion, spreading, and migration on ECM substrates.
• Mediates mechanotransduction, converting mechanical forces into biochemical signals.
• Regulates cell proliferation and survival through integrin-linked signaling pathways.
• Plays a key role in embryonic development and tissue morphogenesis.
• Contributes to immune cell trafficking and inflammation.
• Involved in cancer cell invasion and metastasis.
• Implicated in joint destruction in rheumatoid arthritis via collagen-binding integrins.
• Target for anti-adhesive and anti-angiogenic therapies.
• Essential for platelet aggregation and thrombosis through vitronectin and fibrinogen binding.
• Provides a basis for engineering biomaterials that mimic ECM for regenerative medicine.
Molecular Mechanism of integrin binding involved in cell-matrix adhesion
Integrin Activation and Ligand Binding
In simple terms: Integrins switch from a bent, inactive shape to an extended, active shape that can grab onto matrix proteins.
Integrins are heterodimers that undergo large conformational changes from a low-affinity bent state to a high-affinity extended state upon activation by talin or kindlin. This activation exposes the ligand-binding site, allowing binding to ECM ligands such as fibronectin, vitronectin, and collagens. The binding is divalent cation-dependent, typically requiring Mg2+ or Mn2+. Ligand occupancy stabilizes the active conformation and promotes integrin clustering, which is essential for cell-matrix adhesion.
Ligand Recognition and Specificity
In simple terms: Different integrin pairs recognize specific sequences in matrix proteins, like a lock and key.
Integrin alpha5beta1 binds the RGD motif in fibronectin, while alphaVbeta3 binds vitronectin and other RGD-containing proteins. Laminin-binding integrins such as alpha6beta1 and alpha3beta1 recognize laminin globular domains. Collagen-binding integrins including alpha11beta1 and alpha2beta1 interact with GFOGER motifs in collagens. This specificity ensures that cells adhere to the correct ECM components in their microenvironment.
Cytoskeletal Linkage and Focal Adhesion Assembly
In simple terms: Once integrins grab the matrix, they recruit a team of proteins inside the cell to build a strong anchor.
The cytoplasmic tails of integrin beta subunits bind to talin and kindlin, which in turn link to actin filaments. This connection nucleates focal adhesion complexes containing paxillin, vinculin, and focal adhesion kinase (FAK). These complexes reinforce the adhesion site and transmit forces between the ECM and the cytoskeleton. The assembly is dynamic and regulated by phosphorylation events.
Mechanotransduction and Signaling
In simple terms: Pulling on the matrix generates signals that tell the cell to grow, move, or survive.
Mechanical forces applied to integrin-ligand bonds induce conformational changes that expose binding sites for signaling proteins. This mechanotransduction activates pathways such as FAK/Src, PI3K/Akt, and MAPK, influencing gene expression and cell fate. Force-dependent reinforcement of adhesion is mediated by talin unfolding and vinculin recruitment. These signals are critical for processes like cell cycle progression and apoptosis resistance.
Regulation by Divalent Cations and Post-translational Modifications
In simple terms: Small ions and chemical tags on integrins can tune how tightly they bind.
Divalent cations such as Mg2+ and Ca2+ occupy metal ion-dependent adhesion sites (MIDAS) in the integrin alpha subunit and are required for ligand binding. Phosphorylation of integrin cytoplasmic domains and associated proteins modulates adhesion strength and turnover. Proteolytic cleavage of ECM ligands can also alter binding affinity. These regulatory layers ensure context-dependent adhesion.
Key Genes Involved in GO:0098640 integrin binding involved in cell-matrix adhesion
The following genes encode integrin subunits and key ECM ligands that directly participate in integrin binding involved in cell-matrix adhesion.
| Gene | Major Role | Research Relevance |
|---|---|---|
| ITGA5 | Alpha5 integrin subunit; pairs with beta1 to bind fibronectin | Knockout reduces fibronectin adhesion and focal adhesion formation |
| ITGB1 | Beta1 integrin subunit; partners with multiple alpha subunits | Central to most cell-matrix adhesion; knockout is embryonic lethal |
| ITGAV | AlphaV integrin subunit; binds vitronectin, fibronectin | Target for anti-angiogenic therapy; involved in cancer |
| ITGB3 | Beta3 integrin subunit; forms alphaVbeta3 and alphaIIbbeta3 | Platelet aggregation and bone resorption; point mutations cause Glanzmann thrombasthenia |
| ITGA11 | Alpha11 integrin subunit; collagen receptor | Mediates joint destruction in arthritis; knockout protects mice |
| ITGA2 | Alpha2 integrin subunit; collagen receptor | Polymorphisms linked to thrombosis and cancer |
| ITGA6 | Alpha6 integrin subunit; laminin receptor | Essential for epithelial integrity; knockout causes blistering |
| ITGB4 | Beta4 integrin subunit; laminin receptor | Mutations cause epidermolysis bullosa; knockout models available |
| FN1 | Fibronectin; ECM ligand for alpha5beta1 and alphaVbeta3 | Knockout results in early embryonic lethality |
| VTN | Vitronectin; ligand for alphaVbeta3 and alphaIIbbeta3 | Knockout mice show impaired wound healing |
| LAMA1 | Laminin alpha1; component of laminin-111 | Knockout causes muscular dystrophy-like phenotypes |
| LAMB1 | Laminin beta1; ubiquitous basement membrane component | Knockout is embryonic lethal; used in adhesion studies |
| COL1A1 | Type I collagen alpha1; ligand for collagen-binding integrins | Mutations cause osteogenesis imperfecta; used in adhesion assays |
| COL4A1 | Type IV collagen alpha1; basement membrane ligand | Knockout leads to vascular defects |
| TLN1 | Talin-1; activates integrins and links to actin | Knockout impairs integrin activation and adhesion |
| FERMT2 | Kindlin-2; co-activator of integrins | Knockout causes early lethality and adhesion defects |
| PTK2 | FAK; tyrosine kinase recruited to focal adhesions | Knockout reduces cell migration and adhesion turnover |
| VCL | Vinculin; links integrins to actin cytoskeleton | Knockout is embryonic lethal; regulates adhesion strength |
How Is integrin binding involved in cell-matrix adhesion Regulated?
The function of integrin binding involved in cell-matrix adhesion is regulated at multiple levels. Integrin activation is controlled by intracellular proteins talin and kindlin, which bind to beta-integrin cytoplasmic tails and induce conformational changes. Phosphorylation of integrin tails and associated proteins modulates adhesion dynamics. Extracellular cues such as matrix stiffness and ligand density influence integrin clustering and signaling. Mechanical forces can further reinforce adhesion through talin unfolding and vinculin recruitment. Additionally, endocytic recycling of integrins controls the availability of receptors at the cell surface.
integrin binding involved in cell-matrix adhesion and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| ITGA11 | Rheumatoid arthritis joint destruction | Itga11 knockout mice in hTNFtg background |
| ITGB3 | Glanzmann thrombasthenia; bleeding disorder | Point mutation knock-in mice recapitulating human mutations |
| ITGB4 | Epidermolysis bullosa with pyloric atresia | Conditional knockout in skin epithelium |
| ITGAV | Cancer angiogenesis and metastasis | Xenograft models with integrin alphaV knockout or knockdown |
| PTK2 | Cancer cell migration and invasion | FAK knockout or kinase-dead knock-in in cancer cell lines |
Cancer Progression and Metastasis
Altered integrin binding to ECM components promotes cancer cell invasion, survival, and metastasis. For example, alphaVbeta3 binding to vitronectin supports angiogenesis and tumor growth. Overexpression of alpha5beta1 fibronectin receptor enhances migration and is associated with poor prognosis. Targeting integrin binding with antagonists has been explored in clinical trials.
Inflammatory Joint Disease
Collagen-binding integrin alpha11beta1 contributes to joint destruction in arthritic hTNFtg mice. Knockout of Itga11 reduces cartilage degradation and inflammation, suggesting that blocking this integrin binding could be therapeutic. Other collagen receptors such as alpha2beta1 also play roles in synovial inflammation.
Genetic Skin Blistering Disorders
Mutations in integrin subunits that bind laminins, such as ITGA6 and ITGB4, cause epidermolysis bullosa, a severe skin blistering disease. These mutations impair cell-matrix adhesion in the epidermis, leading to tissue fragility. Understanding the molecular basis of laminin binding is crucial for developing gene therapies.
From integrin binding involved in cell-matrix adhesion-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of ITGA11 reduce arthritis severity? | Itga11 knockout mice crossed with hTNFtg mice |
| How does a point mutation in ITGB3 affect platelet aggregation? | Knock-in mice carrying the human Glanzmann mutation |
| Can a tagged integrin be used to track adhesion dynamics? | Knock-in of fluorescent protein into the ITGB1 locus |
| Does overexpression of ITGA5 enhance metastasis? | Stable overexpression of ITGA5 in cancer cell lines followed by xenograft |
| What is the role of kindlin-2 in integrin activation? | Inducible knockout of FERMT2 in fibroblasts |
| How does matrix stiffness affect integrin binding? | Cells cultured on tunable stiffness hydrogels with integrin blockers |
How to Study the integrin binding involved in cell-matrix adhesion Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Adhesion assay | Cell attachment to ECM ligands | Quantify integrin binding function |
| Immunofluorescence | Integrin localization and focal adhesions | Visualize adhesion structures |
| Co-immunoprecipitation | Protein-protein interactions | Identify integrin-associated proteins |
| CRISPR knockout screen | Genes required for adhesion | Discover novel regulators |
| Traction force microscopy | Mechanical forces exerted by cells | Study mechanotransduction |
| Flow cytometry | Integrin surface expression | Assess activation state with conformation-specific antibodies |
| Solid-phase binding assay | Direct integrin-ligand binding affinity | Measure binding kinetics |
| Phosphoproteomics | Signaling changes upon adhesion | Map integrin-dependent phosphorylation |
Adhesion Assays
Cell adhesion assays measure the ability of cells to attach to ECM-coated surfaces. They are used to quantify integrin binding function and can be combined with blocking antibodies or inhibitors. These assays are typically performed in multiwell plates coated with fibronectin, vitronectin, or collagens.
Immunofluorescence and Live-Cell Imaging
Fluorescence microscopy visualizes integrin localization, focal adhesion formation, and cytoskeletal reorganization. Tagged integrins (e.g., GFP-ITGB1) allow real-time tracking of adhesion dynamics. Total internal reflection fluorescence (TIRF) microscopy is particularly useful for studying adhesion sites near the membrane.
Biochemical Pull-Down and Co-Immunoprecipitation
Pull-down assays using GST-tagged integrin cytoplasmic tails or ECM ligands identify binding partners and post-translational modifications. Co-immunoprecipitation can confirm interactions between integrins and talin, kindlin, or FAK. These methods are essential for mapping the molecular interactome of GO:0098640.
CRISPR Screening and Functional Genomics
Genome-wide CRISPR knockout screens can identify genes required for cell-matrix adhesion. Cells are challenged with ECM detachment or specific matrix coatings, and sgRNA enrichment reveals essential adhesion genes. This approach has uncovered novel regulators of integrin binding and mechanotransduction.
How CRISPR Can Be Used to Study GO:0098640 integrin binding involved in cell-matrix adhesion
Knockout
CRISPR knockout of integrin genes (e.g., ITGA5, ITGB1) or ligand genes (e.g., FN1) abolishes specific integrin binding, providing a clean background to study adhesion. Knockout cell lines are used to test rescue with wild-type or mutant integrins. This approach is ideal for validating the requirement of a gene in cell-matrix adhesion.
Point Mutation
Point mutations introduced by CRISPR base editing or HDR can mimic disease-associated variants in integrin genes, such as ITGB3 mutations causing Glanzmann thrombasthenia. These models allow precise dissection of binding affinity and signaling without confounding effects of complete loss. They are also useful for studying phosphorylation sites in integrin tails.
Knock-in
Knock-in of fluorescent tags (e.g., GFP, mCherry) or epitope tags into endogenous integrin loci enables real-time imaging and biochemical tracking of integrin binding in live cells. This preserves physiological expression levels and regulation. Knock-in of Cre recombinase or inducible systems allows conditional studies.
Overexpression
Overexpression of integrin subunits or ECM ligands via CRISPR activation (CRISPRa) or lentiviral delivery can enhance adhesion and downstream signaling. This is useful for studying gain-of-function effects in cancer and fibrosis models. Overexpression models help identify sufficiency of a given integrin in driving adhesion.
How EDITGENE Supports integrin binding involved in cell-matrix adhesion Research
Researchers studying integrin binding involved in cell-matrix adhesion-related genes often need to determine whether a candidate gene is causally involved in adhesion, migration, or disease progression. EDITGENE provides a comprehensive suite of CRISPR services to generate precisely engineered cell models that answer these questions.
Contact EDITGENE today to design your custom CRISPR model for integrin binding involved in cell-matrix adhesion research.
Frequently Asked Questions About integrin binding involved in cell-matrix adhesion
What is GO:0098640?
GO:0098640 is a Gene Ontology molecular function term defined as any integrin binding that occurs as part of the process of cell-matrix adhesion.
What genes are involved in integrin binding involved in cell-matrix adhesion?
Key genes include ITGA5, ITGB1, ITGAV, ITGB3, ITGA11, ITGA6, ITGB4, FN1, VTN, LAMA1, LAMB1, COL1A1, TLN1, FERMT2, PTK2, and VCL.
How does integrin binding mediate cell-matrix adhesion?
Integrins bind ECM ligands via their extracellular domains, then cluster and link to the actin cytoskeleton through talin and kindlin, forming focal adhesions that transmit forces and signals.
What diseases are associated with defects in integrin binding?
Diseases include cancer metastasis, rheumatoid arthritis, epidermolysis bullosa, and Glanzmann thrombasthenia.
What methods are used to study integrin binding involved in cell-matrix adhesion?
Common methods include adhesion assays, immunofluorescence, co-immunoprecipitation, traction force microscopy, and CRISPR screens.
Can CRISPR be used to study GO:0098640?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models allow precise manipulation of integrin genes to study their role in cell-matrix adhesion.
What is the difference between integrin binding and integrin binding involved in cell-matrix adhesion?
Integrin binding (GO:0005178) is a broader term for any integrin-ligand interaction, while GO:0098640 specifically refers to binding that occurs as part of cell-matrix adhesion.
Which integrins bind fibronectin?
Alpha5beta1 and alphaVbeta3 are major fibronectin-binding integrins.
How is integrin binding regulated?
It is regulated by conformational activation via talin and kindlin, divalent cations, phosphorylation, and mechanical forces.
What model systems are available for studying integrin binding in arthritis?
Itga11 knockout mice in the hTNFtg background are used to study collagen-binding integrin alpha11beta1 in joint destruction.
Conclusion
GO:0098640 integrin binding involved in cell-matrix adhesion is a fundamental molecular function that underpins cell adhesion, mechanotransduction, and tissue homeostasis. Its dysregulation is linked to cancer, inflammatory diseases, and genetic disorders. Understanding the precise molecular players and mechanisms provides opportunities for therapeutic intervention. EDITGENE offers comprehensive CRISPR solutions to create tailored cell models for studying this term, from knockout to knock-in and screening services.
References
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- 3. De Giuseppe A et al.. 2025. Collagen-binding integrin α11β1 contributes to joint destruction in arthritic hTNFtg mice.. Ann Rheum Dis 84(10):1649-1659 PMID: 40816940
- 4. Mould AP. 2002. Analyzing integrin-dependent adhesion.. Curr Protoc Cell Biol Chapter 9:Unit 9.4 PMID: 18228412
- 5. Chen Y et al.. 2017. Receptor-mediated cell mechanosensing.. Mol Biol Cell 28(23):3134-3155 PMID: 28954860
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- 7. Jansen KA et al.. 2017. Mechanotransduction at the cell-matrix interface.. Semin Cell Dev Biol 71:75-83 PMID: 28754442
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