GO:0030938 collagen type XVIII trimer: Components, Assembly and Research Methods, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0030938 (collagen type XVIII trimer) is a cellular_component defined as a collagen homotrimer of alpha1(XVIII) chains.
• The trimer is formed by the non-collagenous NC1 domain, which adopts a novel collagen trimerization fold.
• The NC1/endostatin domain of collagen XVIII regulates cell migration, axon guidance, and morphogenesis in a trimerization-dependent manner.
• Proteolytic release of endostatin from the trimer by matrix metalloproteases generates biologically active antiangiogenic fragments.
• The trimerization domain is used in protein engineering to stabilize multivalent antibodies and fusion proteins.
• Collagen XVIII trimer biology is relevant to angiogenesis, basement membrane function, and cancer therapy.
Description
Collagen type XVIII trimer (GO:0030938) is a cellular component consisting of a homotrimer of alpha1(XVIII) chains. This trimeric assembly is essential for the structural integrity of collagen XVIII, a multiplexin found in basement membranes and involved in cell migration, axon guidance, and angiogenesis. The trimerization domain, located in the non-collagenous NC1 region, adopts a unique fold that drives the assembly of the three alpha1(XVIII) chains. Understanding this trimer is critical because its proteolytic processing releases endostatin, a potent antiangiogenic fragment, and because trimerization regulates the biological activities of the NC1 domain. Researchers study GO:0030938 to dissect basement membrane biology, develop antiangiogenic therapies, and engineer stable multivalent proteins.
collagen type XVIII trimer At A Glance
| GO ID | GO:0030938 |
|---|---|
| GO term | collagen type XVIII trimer |
| Ontology | cellular_component |
| Synonym | none |
| Major function | Structural component of basement membranes; precursor for endostatin; regulates cell migration and axon guidance |
| Assembly domain | NC1 trimerization domain with a novel collagen trimerization fold |
| Proteolytic processing | Cleaved by matrix metalloproteases to release endostatin |
| Biotechnological use | Trimerization domain used to stabilize multivalent antibodies and fusion proteins |
What Is GO:0030938?
According to QuickGO, GO:0030938 (collagen type XVIII trimer) is a collagen homotrimer composed of three alpha1(XVIII) chains. This term describes the assembled trimeric protein complex, which is a structural component of the extracellular matrix and basement membranes. The trimer is formed through the NC1 trimerization domain, which mediates the specific association of three identical alpha1(XVIII) polypeptides.
Why Is collagen type XVIII trimer Important in Cell Biology?
The collagen type XVIII trimer is important because it serves as the structural scaffold for collagen XVIII in basement membranes and as the source of endostatin, a natural inhibitor of angiogenesis. Trimerization is required for the biological functions of the NC1/endostatin domain, including the regulation of cell motility and morphogenesis. Dysregulation of collagen XVIII and its trimerization has been implicated in cancer, where endostatin-based therapies aim to inhibit tumor angiogenesis. Additionally, the trimerization domain is a valuable tool in protein engineering for creating stable multivalent antibodies and therapeutic fusion proteins.
• Provides structural integrity to basement membranes as a homotrimer of alpha1(XVIII) chains.
• Serves as the precursor for endostatin, an antiangiogenic fragment released by matrix metalloproteases.
• Regulates cell migration and axon guidance in a trimerization-dependent manner.
• Modulates motility and morphogenesis through the NC1/endostatin domain.
• Implicated in cancer angiogenesis and targeted antiangiogenic therapy.
• Used in biotechnology to stabilize multivalent antibodies and fusion proteins.
• Represents a model for studying collagen trimerization folds and extracellular matrix assembly.
• Potential target for engineering matrix-remodeling-responsive therapeutics.
What Happens During collagen type XVIII trimer?
Trimerization of alpha1(XVIII) chains
In simple terms: Three identical collagen XVIII protein chains come together to form a three-part structure.
The collagen type XVIII trimer is formed by the specific association of three alpha1(XVIII) chains through the NC1 trimerization domain, which adopts a novel collagen trimerization fold. This homotrimeric assembly is a prerequisite for the structural and functional roles of collagen XVIII in basement membranes.
Proteolytic release of endostatin
In simple terms: Enzymes cut the trimer to release a small antiangiogenic piece called endostatin.
Biologically active endostatin fragments are generated from human collagen XVIII by distinct matrix metalloproteases, which cleave the NC1 domain of the trimer. This proteolytic processing converts the trimer into a source of endostatin, which inhibits angiogenesis.
Regulation of cell migration and axon guidance
In simple terms: The trimer helps guide how cells move and how nerve fibers find their targets.
The NC1/endostatin domain of Caenorhabditis elegans type XVIII collagen affects cell migration and axon guidance, demonstrating a role for the trimer in developmental processes. Oligomerization-dependent regulation of motility and morphogenesis by the collagen XVIII NC1/endostatin domain further supports the importance of the trimeric state.
Engineering applications of the trimerization domain
In simple terms: Scientists use the trimer-forming part to build more stable therapeutic proteins.
The human collagen XVIII trimerization domain has been used to improve the stability of multivalent antibodies. Additionally, a novel trimeric fusion protein TRAIL-collagen XVIII NC1 was engineered and refolded, highlighting the utility of the trimerization domain in biotechnology.
Key Genes Involved in GO:0030938 collagen type XVIII trimer
The following genes and proteins are directly or indirectly involved in the biology of the collagen type XVIII trimer (GO:0030938).
| Gene | Major Role | Research Relevance |
|---|---|---|
| COL18A1 | Encodes the alpha1(XVIII) chain that forms the homotrimer | Core component of GO:0030938; mutations linked to Knobloch syndrome and cancer |
| MMP2 | Matrix metalloprotease that cleaves collagen XVIII to release endostatin | Regulates endostatin generation from the trimer |
| MMP9 | Matrix metalloprotease involved in endostatin release | Contributes to proteolytic processing of collagen XVIII |
| MMP13 | Matrix metalloprotease that generates endostatin fragments | Plays a role in collagen XVIII turnover |
| NC1 domain | Non-collagenous domain responsible for trimerization | Essential for trimer assembly and endostatin activity |
| Endostatin | Proteolytic fragment of the NC1 domain | Inhibits angiogenesis; used in cancer therapy research |
| TRAIL | Fusion partner with collagen XVIII NC1 | Engineered trimeric fusion protein for therapeutic applications |
| Antibody heavy chain | Fused to collagen XV/XVIII trimerization domain | Improves stability of multivalent antibodies |
| Collagen XV | Related multiplexin with similar trimerization domain | Comparative studies of trimerization folds |
| Integrins | Receptors that may interact with collagen XVIII | Mediate cell-matrix interactions |
| Basement membrane components | Structural partners of collagen XVIII | Maintain extracellular matrix integrity |
| VEGF | Angiogenic factor antagonized by endostatin | Target of antiangiogenic therapy |
| FGF2 | Angiogenic factor inhibited by endostatin | Modulates angiogenesis |
| MMP inhibitors | Regulate MMP activity | Indirectly control endostatin release |
| Heparan sulfate proteoglycans | Bind collagen XVIII and modulate its function | Influence trimer interactions |
How Is collagen type XVIII trimer Regulated?
The formation and function of the collagen type XVIII trimer are regulated at multiple levels. Trimerization is driven by the NC1 domain, which ensures the specific assembly of three alpha1(XVIII) chains. Proteolytic cleavage by matrix metalloproteases, such as MMP2, MMP9, and MMP13, regulates the release of endostatin from the trimer, thereby controlling its antiangiogenic activity. The biological effects of the NC1/endostatin domain are oligomerization-dependent, meaning that trimerization is required for its regulatory roles in cell motility and morphogenesis. Additionally, matrix remodeling events can be exploited to enhance the targeting of antibody-collagen XVIII NC1 domain fusion proteins.
collagen type XVIII trimer and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| COL18A1 | Knobloch syndrome; basement membrane defects | Col18a1 knockout mouse; patient-derived iPSCs |
| COL18A1 | Cancer angiogenesis | Xenograft models with endostatin therapy |
| MMP2 | Tumor progression and angiogenesis | Mmp2 knockout mice; cancer cell lines |
| MMP9 | Inflammation and cancer | Mmp9 knockout mice; zebrafish models |
| COL18A1 | Axon guidance defects | C. elegans and zebrafish models |
Cancer and Angiogenesis
Collagen XVIII trimer serves as a source of endostatin, a natural inhibitor of angiogenesis. Enhanced antiangiogenic therapy has been achieved with antibody-collagen XVIII NC1 domain fusion proteins engineered to exploit matrix remodeling events, highlighting the therapeutic potential of targeting this trimer in cancer. The proteolytic release of endostatin by matrix metalloproteases is a key mechanism linking the trimer to tumor angiogenesis.
Developmental and Neurological Disorders
The NC1/endostatin domain of collagen XVIII affects cell migration and axon guidance, processes critical for nervous system development. Disruption of these functions could contribute to developmental anomalies, although direct links to human disease require further investigation.
Basement Membrane Pathologies
As a structural component of basement membranes, the collagen XVIII trimer is essential for tissue integrity. Mutations in COL18A1, which encodes the alpha1(XVIII) chain, can impair trimer formation and basement membrane function, potentially leading to disorders such as Knobloch syndrome.
From collagen type XVIII trimer-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| What is the role of collagen XVIII trimer in basement membrane assembly? | COL18A1 knockout mouse |
| How does trimerization affect endostatin release? | Point mutations in the NC1 domain |
| Can the trimerization domain stabilize therapeutic antibodies? | Knock-in of trimerization domain into antibody genes |
| What is the effect of endostatin on angiogenesis? | Overexpression of endostatin in tumor models |
| How does collagen XVIII trimer regulate axon guidance? | C. elegans with tagged knock-in of collagen XVIII |
| What are the structural determinants of trimerization? | Recombinant expression and crystallography of NC1 domain |
How to Study the collagen type XVIII trimer Process
| Method | What It Measures | Typical Application |
|---|---|---|
| X-ray crystallography | 3D structure of the trimerization domain | Determining the collagen trimerization fold |
| Mass spectrometry | Cleavage sites and endostatin fragments | Mapping MMP-mediated processing |
| Cell migration assay | Cell motility changes | Assessing NC1/endostatin function |
| Axon guidance assay | Neuronal pathfinding | Studying collagen XVIII in C. elegans |
| Surface plasmon resonance | Binding affinities | Analyzing trimer interactions |
| Circular dichroism | Protein secondary structure | Validating trimer folding |
| ELISA | Endostatin levels | Quantifying release from trimer |
| Antibody stability assay | Thermal and storage stability | Evaluating trimerization domain fusions |
Structural Biology
X-ray crystallography and NMR spectroscopy are used to determine the three-dimensional structure of the collagen XVIII trimerization domain, revealing a novel collagen trimerization fold. These methods provide atomic-level insights into how the three alpha1(XVIII) chains assemble.
Proteomics and Cleavage Assays
Matrix metalloprotease cleavage assays combined with mass spectrometry can identify the specific sites where endostatin is released from the collagen XVIII trimer. This helps map the proteolytic regulation of the trimer.
Cell Migration and Axon Guidance Assays
In vitro cell migration assays and in vivo axon guidance models in C. elegans are used to study the functional consequences of collagen XVIII trimer mutations. These assays link trimerization to cellular behaviors.
Protein Engineering and Stability Testing
Recombinant DNA technology is employed to fuse the collagen XVIII trimerization domain to antibodies or TRAIL, followed by stability and activity assays to evaluate the engineered proteins.
How CRISPR Can Be Used to Study GO:0030938 collagen type XVIII trimer
Knockout
CRISPR knockout of COL18A1 can abolish collagen XVIII trimer formation, enabling studies of its role in basement membrane integrity and endostatin production. Knockout models in mice or cell lines help dissect the contribution of the trimer to angiogenesis and development.
Point Mutation
Introducing point mutations in the NC1 trimerization domain via CRISPR can disrupt trimer assembly or alter endostatin release, allowing structure-function analysis. Such models are valuable for understanding how specific residues contribute to the collagen trimerization fold.
Knock-in
Knock-in of tagged versions of COL18A1 (e.g., GFP or HA) using CRISPR facilitates live-cell imaging and biochemical tracking of the collagen XVIII trimer. Tagged knock-in models can also be used to study tissue-specific expression and localization.
Overexpression
CRISPR activation or transgenic overexpression of COL18A1 can increase trimer levels and endostatin production, providing models to test antiangiogenic therapies. Overexpression of engineered trimeric fusion proteins, such as TRAIL-collagen XVIII NC1, can be achieved via CRISPR-mediated integration.
How EDITGENE Supports collagen type XVIII trimer Research
Researchers studying collagen type XVIII trimer-related genes often need to determine whether a candidate gene is causally involved in trimer assembly, endostatin release, or downstream angiogenesis. EDITGENE provides comprehensive CRISPR services to create precisely engineered cell and animal models for such investigations.
Contact EDITGENE today to design your custom CRISPR model for collagen type XVIII trimer research.
Frequently Asked Questions About collagen type XVIII trimer
What is GO:0030938?
GO:0030938 is the Gene Ontology term for collagen type XVIII trimer, a cellular component defined as a homotrimer of alpha1(XVIII) chains.
What genes are involved in collagen type XVIII trimer?
The primary gene is COL18A1, which encodes the alpha1(XVIII) chain. Matrix metalloproteases such as MMP2, MMP9, and MMP13 are involved in its processing.
What is the function of collagen type XVIII trimer?
It provides structural support in basement membranes and serves as a precursor for endostatin, which inhibits angiogenesis and regulates cell migration.
How is collagen type XVIII trimer assembled?
Three alpha1(XVIII) chains associate through the NC1 trimerization domain, which adopts a novel collagen trimerization fold.
What diseases are associated with collagen type XVIII trimer?
It is linked to cancer angiogenesis, developmental axon guidance defects, and basement membrane disorders such as Knobloch syndrome.
How is endostatin released from collagen type XVIII trimer?
Matrix metalloproteases cleave the NC1 domain of the trimer to release biologically active endostatin fragments.
Can collagen type XVIII trimer be studied with CRISPR?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models can be used to study its assembly, function, and role in disease.
What is the trimerization domain of collagen XVIII?
It is the NC1 domain that mediates the specific association of three alpha1(XVIII) chains and is essential for trimer formation.
Is collagen type XVIII trimer used in biotechnology?
Yes, its trimerization domain is used to stabilize multivalent antibodies and therapeutic fusion proteins.
What model organisms are used to study collagen type XVIII trimer?
C. elegans, zebrafish, and mice are commonly used to study its roles in cell migration, axon guidance, and angiogenesis.
Conclusion
The collagen type XVIII trimer (GO:0030938) is a crucial extracellular matrix component with diverse roles in basement membrane structure, endostatin release, and the regulation of cell migration and angiogenesis. Its unique trimerization fold and proteolytic processing make it a focal point for cancer research and protein engineering. Understanding this trimer provides insights into developmental biology and offers therapeutic opportunities. EDITGENE's CRISPR services empower researchers to create precise models for studying collagen type XVIII trimer in health and disease.
References
- 1. Ackley BD et al.. 2001. The NC1/endostatin domain of Caenorhabditis elegans type XVIII collagen affects cell migration and axon guidance.. J Cell Biol 152(6):1219-32 PMID: 11257122
- 2. Boudko SP et al.. 2009. Crystal structure of human collagen XVIII trimerization domain: A novel collagen trimerization Fold.. J Mol Biol 392(3):787-802 PMID: 19631658
- 3. Bretaud S et al.. 2020. Collagen XV, a multifaceted multiplexin present across tissues and species.. Matrix Biol Plus 6-7:100023 PMID: 33543021
- 4. Heljasvaara R et al.. 2005. Generation of biologically active endostatin fragments from human collagen XVIII by distinct matrix metalloproteases.. Exp Cell Res 307(2):292-304 PMID: 15950618
- 5. Cuesta AM et al.. 2012. Improved stability of multivalent antibodies containing the human collagen XV trimerization domain.. MAbs 4(2):226-32 PMID: 22453098
- 6. Sánchez-Arévalo Lobo VJ et al.. 2006. Enhanced antiangiogenic therapy with antibody-collagen XVIII NC1 domain fusion proteins engineered to exploit matrix remodeling events.. Int J Cancer 119(2):455-62 PMID: 16477626
- 7. Kuo CJ et al.. 2001. Oligomerization-dependent regulation of motility and morphogenesis by the collagen XVIII NC1/endostatin domain.. J Cell Biol 152(6):1233-46 PMID: 11257123
- 8. Pan LQ et al.. 2013. Engineering and refolding of a novel trimeric fusion protein TRAIL-collagen XVIII NC1.. Appl Microbiol Biotechnol 97(16):7253-64 PMID: 23208613
