GO:0005587 collagen type IV trimer: Components, Assembly and Research Methods, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0005587 (collagen type IV trimer) is a cellular component defined as a collagen heterotrimer containing type IV alpha chains, most commonly [alpha1(IV)]2alpha2(IV), whose triple helices assemble into three-dimensional nets within basement membranes.
• Type IV collagen trimers are the principal structural scaffold of basement membranes and are essential for tissue compartmentalization, filtration, and signaling.
• Mutations in COL4A1, COL4A2, COL4A3, COL4A4, and COL4A5 disrupt trimer formation or secretion and cause kidney, vascular, and ocular disease.
• Trimerization is chain-specific and regulated; the NC1 domain directs selective chain association, and exon location of glycine substitutions influences clinical outcome.
• Fluorescent knock-in and zebrafish models have revealed trimer diversity and conserved antiangiogenic functions of specific alpha chains.
• CRISPR knockout, point-mutation, knock-in, and overexpression models enable causal testing of collagen IV trimer genes in basement membrane biology and disease.
Description
Collagen type IV trimer (GO:0005587) is the fundamental building block of basement membranes, the thin extracellular matrices that separate epithelial and endothelial cells from underlying stroma. Unlike fibrillar collagens, type IV collagen trimers assemble into a meshwork rather than rope-like fibrils, providing mechanical support and serving as a scaffold for signaling molecules. The term describes a heterotrimer of type IV alpha chains, with the most commonly observed isoform being [alpha1(IV)]2alpha2(IV), although additional alpha chains exist and can be incorporated into trimers in a tissue-specific manner. Researchers study collagen type IV trimers because they are central to organ development, vascular integrity, and filtration barriers. Genetic defects in the genes encoding type IV collagen chains cause Alport syndrome, porencephaly, and related disorders, making trimer assembly a direct therapeutic target. Recent work has expanded the known trimer repertoire and revealed that chain composition influences basement membrane function and disease severity. Understanding GO:0005587 therefore connects extracellular matrix biology, kidney physiology, and neurovascular disease. This article synthesizes authoritative QuickGO annotation and verified PubMed literature to describe the components, assembly, regulation, and research methods relevant to collagen type IV trimers.
collagen type IV trimer At A Glance
| GO ID | GO:0005587 |
|---|---|
| GO term | collagen type IV trimer |
| Ontology | cellular_component |
| Synonym | none |
| Major function | Structural scaffold of basement membranes; heterotrimeric triple helix that assembles into 3D nets |
| Common chain composition | [alpha1(IV)]2alpha2(IV) heterotrimer; other alpha chains may substitute |
| Assembly domain | NC1 domain directs chain selection and trimerization |
| Associated diseases | Alport syndrome, COL4A1/COL4A2-related small vessel disease, kidney failure |
| Model organisms | C. elegans, zebrafish, mouse, human cell lines |
What Is GO:0005587?
GO:0005587 (collagen type IV trimer) is a cellular component term describing a collagen heterotrimer composed of type IV alpha chains. The most commonly observed trimer is [alpha1(IV)]2alpha2(IV), but additional type IV alpha chains exist and may be present in trimers. These triple-helical trimers associate end-to-end and laterally to form three-dimensional nets within basement membranes, distinguishing them from fibril-forming collagens.
Why Is collagen type IV trimer Important in Cell Biology?
Collagen type IV trimers are essential for basement membrane integrity and function, and their disruption causes a spectrum of human diseases including Alport syndrome, hereditary angiopathy, and nephropathy. Because trimer composition determines basement membrane properties, understanding GO:0005587 informs diagnostic and therapeutic strategies for collagen IV disorders.
• Provides the structural framework for all basement membranes, influencing tissue architecture and filtration.
• Mutations in COL4A3/COL4A4/COL4A5 cause Alport syndrome, a leading genetic cause of kidney failure.
• COL4A1 and COL4A2 mutations cause cerebrovascular and ocular defects.
• Trimer diversity contributes to tissue-specific basement membrane functions.
• The alpha3NC1 domain has antiangiogenic activity, linking trimers to cancer biology.
• Trimer secretion can be modulated pharmacologically, offering therapeutic avenues.
• Exon location of glycine substitutions affects kidney survival, informing genotype-phenotype correlations.
• Model organisms such as C. elegans and zebrafish enable live imaging of trimer assembly.
What Happens During collagen type IV trimer?
Chain selection and trimerization
In simple terms: Type IV collagen chains choose their partners and twist together into a three-stranded rope.
Type IV collagen trimers form through selective association of alpha chains, directed by the non-collagenous NC1 domain. The most common trimer is [alpha1(IV)]2alpha2(IV), but other alpha chains can be incorporated depending on tissue context. Trimerization is a prerequisite for secretion and basement membrane assembly.
Triple helix formation and secretion
In simple terms: Once chains are selected, they wind into a triple helix and are exported from the cell.
After chain selection, the three alpha chains fold into a triple-helical conformation. This structure is stabilized by glycine residues at every third position, and mutations such as glycine substitutions can impair folding and secretion. Secreted trimers are deposited into the extracellular space.
Network assembly in basement membranes
In simple terms: Trimers link end-to-end and side-to-side to form a flexible net that supports cells.
In the extracellular matrix, type IV collagen trimers self-assemble into a three-dimensional network through NC1 domain interactions and triple-helical lateral associations. This net provides tensile strength and organizes basement membrane components.
Trimer diversity and tissue specificity
In simple terms: Different tissues use different chain combinations to fine-tune basement membrane properties.
Fluorescent knock-in studies in C. elegans have revealed trimer diversity in basement membranes, showing that distinct chain combinations localize to specific tissues. Zebrafish studies have identified unique alpha4 chain structures and conserved antiangiogenic activity of alpha3NC1, highlighting evolutionary conservation of trimer functions.
Key Genes Involved in GO:0005587 collagen type IV trimer
The genes encoding type IV collagen alpha chains and their modifying enzymes are central to collagen type IV trimer biology.
| Gene | Major Role | Research Relevance |
|---|---|---|
| COL4A1 | Encodes alpha1(IV) chain; forms [alpha1(IV)]2alpha2(IV) trimers | Mutations cause porencephaly and vascular disease |
| COL4A2 | Encodes alpha2(IV) chain; partner of alpha1(IV) | Mutations cause cerebrovascular and ocular defects |
| COL4A3 | Encodes alpha3(IV) chain; forms alpha3alpha4alpha5 trimers | Mutations cause autosomal Alport syndrome |
| COL4A4 | Encodes alpha4(IV) chain; forms alpha3alpha4alpha5 trimers | Mutations cause autosomal Alport syndrome |
| COL4A5 | Encodes alpha5(IV) chain; forms alpha3alpha4alpha5 trimers | X-linked Alport syndrome; exon deletions affect trimerization |
| COL4A6 | Encodes alpha6(IV) chain; alternative trimer partner | Expands trimer diversity in basement membranes |
| NC1 domain | Directs chain selection and trimerization | Target for mutations and antiangiogenic therapy |
| Glycine residues | Stabilize triple helix | Glycine substitutions impair secretion and cause disease |
| HSP47 | Collagen-specific chaperone | Facilitates folding and secretion of trimers |
| P4HA | Prolyl hydroxylase | Modifies prolines for triple helix stability |
| Lysyl hydroxylase | Hydroxylates lysines | Cross-linking and network stabilization |
| MMP-2/MMP-9 | Degrade type IV collagen | Remodeling and cancer invasion |
| Integrins | Receptors for type IV collagen | Cell-matrix signaling |
| DDR1 | Discoidin domain receptor | Senses collagen IV trimers |
| Laminin | Co-assembles with collagen IV | Basement membrane network formation |
| Nidogen | Connects collagen IV and laminin | Basement membrane assembly |
| Perlecan | Proteoglycan in basement membrane | Interacts with collagen IV |
| Cyclosporin A derivative | Induces mutant collagen secretion | Therapeutic candidate for Alport syndrome |
How Is collagen type IV trimer Regulated?
Collagen type IV trimer assembly and secretion are regulated at multiple levels. Transcriptional control of COL4A genes, chaperone availability (e.g., HSP47), and post-translational modifications such as prolyl hydroxylation influence trimer formation. The NC1 domain governs chain selectivity, and mutations in this domain can alter trimer composition. Pharmacological agents such as cyclosporin A derivatives can induce secretion of mutant trimers, suggesting that folding and trafficking are regulatable. Exon location of glycine substitutions affects clinical outcomes, indicating that sequence context modulates trimer stability and function.
collagen type IV trimer and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| COL4A3 | Autosomal Alport syndrome | Knockout mouse, patient iPSC-derived podocytes |
| COL4A4 | Autosomal Alport syndrome | Knockout mouse, kidney organoids |
| COL4A5 | X-linked Alport syndrome | Exon-deletion knock-in, patient fibroblasts |
| COL4A1 | Porencephaly, vascular disease | Knock-in mouse, zebrafish |
| COL4A2 | Cerebrovascular defects | Knockout mouse, cell lines |
Alport syndrome and kidney disease
Alport syndrome is caused by mutations in COL4A3, COL4A4, or COL4A5, which disrupt the alpha3alpha4alpha5 trimer in glomerular basement membranes. Exon location of glycine substitutions impacts kidney survival, and trimerization profiles of COL4A5 exon deletions correlate with disease severity. Cyclosporin A derivatives can induce secretion of mutant trimers, offering a potential therapeutic strategy.
COL4A1/COL4A2-related vascular and ocular disease
Mutations in COL4A1 and COL4A2 cause a spectrum of disorders including porencephaly, cerebral small vessel disease, and ocular defects. These mutations impair trimer formation and basement membrane integrity in vascular and ocular tissues.
Angiogenesis and cancer
The alpha3NC1 domain of type IV collagen has conserved antiangiogenic activity, and unique alpha4 chain structures in zebrafish highlight trimer diversity relevant to vascular biology. Type IV collagen trimers are remodeled in tumor microenvironments, influencing cancer progression.
From collagen type IV trimer-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of COL4A5 disrupt trimer assembly? | CRISPR knockout in podocytes or fibroblasts |
| How does a glycine substitution affect secretion? | Point-mutation knock-in in HEK293 or patient cells |
| Can a drug rescue mutant trimer secretion? | Knock-in disease model treated with cyclosporin A derivative |
| Where are specific trimers localized in vivo? | Fluorescent knock-in in C. elegans |
| What is the antiangiogenic role of alpha3NC1? | Zebrafish overexpression and knockdown |
| Does COL4A1 mutation cause vascular defects? | Mouse knock-in and imaging |
How to Study the collagen type IV trimer Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Fluorescent knock-in | Trimer localization and diversity | Live imaging in C. elegans |
| Immunoprecipitation | Trimer composition and secretion | Patient cell profiling |
| CRISPR knockout | Loss-of-function effects | Kidney organoids |
| Point-mutation knock-in | Glycine substitution impact | HEK293 disease modeling |
| Zebrafish knockdown | Antiangiogenic activity | Vascular development |
| Drug treatment assay | Mutant trimer secretion rescue | Alport syndrome therapy |
| Clinical genetic analysis | Genotype-phenotype correlation | Kidney survival prediction |
| Mouse knock-in | Vascular and ocular defects | COL4A1/COL4A2 disease |
Fluorescent knock-in imaging
Fluorescent knock-in of collagen IV chains enables live imaging of trimer diversity and localization in basement membranes, as demonstrated in C. elegans.
Biochemical trimerization assays
Immunoprecipitation and Western blotting can assess trimer formation and secretion in patient cells or engineered cell lines, as used to profile COL4A5 exon deletions.
Zebrafish models for antiangiogenic function
Zebrafish studies have identified unique alpha4 chain structures and conserved antiangiogenic activity of alpha3NC1, providing a platform for functional studies.
Genotype-phenotype correlation
Clinical genetic data and exon-level analysis link glycine substitution location to kidney survival, informing prognostic and therapeutic research.
How CRISPR Can Be Used to Study GO:0005587 collagen type IV trimer
Knockout
CRISPR knockout of COL4A3, COL4A4, or COL4A5 in podocytes or kidney organoids can model Alport syndrome and reveal trimer assembly defects.
Point Mutation
Introducing glycine substitutions via CRISPR point mutation allows study of triple helix stability and secretion, as glycine substitutions impact kidney survival.
Knock-in
Knock-in of fluorescent tags or disease alleles enables tracking of trimer localization and composition in vivo, as shown in C. elegans.
Overexpression
Overexpression of wild-type or mutant alpha chains can test dominant-negative effects and rescue strategies, including drug-induced secretion.
How EDITGENE Supports collagen type IV trimer Research
Researchers studying collagen type IV trimer-related genes often need to determine whether a candidate gene is causally involved in basement membrane assembly, disease progression, or therapeutic response. EDITGENE provides end-to-end CRISPR services to generate precisely engineered cell and animal models for such investigations.
Contact EDITGENE today to design your custom CRISPR model for collagen type IV trimer research.
Related Products
| Product name | Cat.No. | Species | Gene ID | |
|---|---|---|---|---|
| COL4A2 Knockout HEK293 Cell Line | EDJ-KQ254 | Human | 1284 | Details Get a Quote |
| COL4A1 Knockout HEK293 Cell Line | EDJ-KQ770 | Human | 1282 | Details Get a Quote |
| COL4A3 Knockout HEK293 Cell Line | EDJ-KQ771 | Human | 1285 | Details Get a Quote |
| COL4A4 Knockout HEK293 Cell Line | EDJ-KQ772 | Human | 1286 | Details Get a Quote |
| COL4A5 Knockout HEK293 Cell Line | EDJ-KQ773 | Human | 1287 | Details Get a Quote |
| COL4A6 Knockout HEK293 Cell Line | EDJ-KQ774 | Human | 1288 | Details Get a Quote |
| COL4A5 Knockout A-549 Cell Line | EDJ-KQ18278 | Human | 1287 | Details Get a Quote |
| COL4A1 Knockout A-549 Cell Line | EDJ-KQ19467 | Human | 1282 | Details Get a Quote |
| COL4A1 Knockout HeLa Cell Line | EDJ-KQ19468 | Human | 1282 | Details Get a Quote |
| COL4A2 Knockout A-549 Cell Line | EDJ-KQ19469 | Human | 1284 | Details Get a Quote |
| COL4A2 Knockout HeLa Cell Line | EDJ-KQ19471 | Human | 1284 | Details Get a Quote |
| COL4A3 Knockout A-549 Cell Line | EDJ-KQ19472 | Human | 1285 | Details Get a Quote |
| COL4A3 Knockout HCT 116 Cell Line | EDJ-KQ19473 | Human | 1285 | Details Get a Quote |
| COL4A3 Knockout HeLa Cell Line | EDJ-KQ19474 | Human | 1285 | Details Get a Quote |
| COL4A4 Knockout A-549 Cell Line | EDJ-KQ19475 | Human | 1286 | Details Get a Quote |
Displaying Records 1 To 15 Of 24 Records
Frequently Asked Questions About collagen type IV trimer
What is collagen type IV trimer?
It is a heterotrimeric protein complex of type IV collagen alpha chains, most commonly [alpha1(IV)]2alpha2(IV), that forms the structural net of basement membranes.
What genes are involved in collagen type IV trimer?
The main genes are COL4A1, COL4A2, COL4A3, COL4A4, COL4A5, and COL4A6, which encode different alpha chains.
What diseases are linked to collagen type IV trimer mutations?
Alport syndrome, porencephaly, cerebral small vessel disease, and ocular defects are linked to mutations in these genes.
How is collagen type IV trimer assembled?
Alpha chains are selected via the NC1 domain, fold into a triple helix, and assemble into a three-dimensional net in basement membranes.
What is the role of COL4A5 in Alport syndrome?
COL4A5 mutations cause X-linked Alport syndrome, and exon deletions affect trimerization profiles and disease severity.
Can collagen type IV trimer secretion be rescued?
Cyclosporin A derivatives can induce secretion of mutant type IV collagen, offering a therapeutic strategy for Alport syndrome.
What model organisms are used to study collagen IV trimers?
C. elegans, zebrafish, and mouse models are widely used for imaging and functional studies.
How does glycine substitution affect collagen IV trimers?
Glycine substitutions impair triple helix folding and secretion, and their exon location impacts kidney survival.
What is the antiangiogenic role of alpha3NC1?
The alpha3NC1 domain of type IV collagen has conserved antiangiogenic activity, as shown in zebrafish.
How can CRISPR help study collagen type IV trimers?
CRISPR knockout, point mutation, knock-in, and overexpression models enable causal testing of gene function in basement membrane biology.
Conclusion
Collagen type IV trimer (GO:0005587) is a cornerstone of basement membrane biology, with essential roles in tissue architecture, filtration, and signaling. Mutations in its component chains cause a range of human diseases, and emerging models continue to reveal trimer diversity and therapeutic opportunities. By integrating CRISPR engineering with biochemical and imaging approaches, researchers can dissect the assembly, regulation, and disease mechanisms of collagen IV trimers, accelerating the development of targeted therapies.
References
- 1. Srinivasan S et al.. 2025. The life cycle of type IV collagen.. Matrix Biol 139:14-28 PMID: 40306374
- 2. Quinlan C et al.. 2021. Genetic Basis of Type IV Collagen Disorders of the Kidney.. Clin J Am Soc Nephrol 16(7):1101-1109 PMID: 33849932
- 3. Koyama Y et al.. 2024. Trimerization profile of type IV collagen COL4A5 exon deletion in X-linked Alport syndrome.. Clin Exp Nephrol 28(9):874-881 PMID: 38658441
- 4. Srinivasan S et al.. 2025. A collagen IV fluorophore knock-in toolkit reveals trimer diversity in C. elegans basement membranes.. J Cell Biol 224(6) PMID: 40100062
- 5. Kuwazuru J et al.. 2023. CyclosporinA Derivative as Therapeutic Candidate for Alport Syndrome by Inducing Mutant Type IV Collagen Secretion.. Kidney360 4(7):909-917 PMID: 37143203
- 6. Meuwissen ME et al.. 2015. The expanding phenotype of COL4A1 and COL4A2 mutations: clinical data on 13 newly identified families and a review of the literature.. Genet Med 17(11):843-53 PMID: 25719457
- 7. LeBleu VS et al.. 2023. Identification of unique α4 chain structure and conserved antiangiogenic activity of α3NC1 type IV collagen in zebrafish.. Dev Dyn 252(7):1046-1060 PMID: 37002899
- 8. Pagniez MS et al.. 2025. Exon location of glycine substitutions impacts kidney survival in autosomal dominant Alport syndrome.. Nephrol Dial Transplant 40(8):1522-1530 PMID: 39810285
