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Structural Proteins Guide
Collagen: Strengthening Your Vital Research
A comprehensive guide to the structure, function, and pathological significance of the human body's most abundant structural protein.
Collagen is the most abundant protein in the human body, accounting for nearly a third of total protein composition. With at least 16 different distinct isoforms, it can be observed in nearly all native tissues.
Collagen plays a vital role as a structural protein in connective tissues such as tendons, ligaments, and skin. It provides immense tensile strength and elasticity, often working symbiotically alongside other important structural proteins such as keratin and elastin. Its abundance, evolutionary conservation, and variety in both form and function make it a fundamental protein targeted continuously in developmental and pathological research.
1. Collagen Structure
The shape and structural properties of collagen are the direct result of its highly specialized triple-helical α-domains. In classical collagen forms, a single triple-helical domain comprises nearly 95% of the molecule's total mass.
The Gly-Y-Z Triplet Sequence
The correct folding of these chains requires a massive repetitive sequence. Each α-chain is composed of multiple triplet sequences of Gly-Y-Z:
- Glycine is required at every third position to allow the tight packing of the helix core.
- Y is typically proline.
- Z is predominantly hydroxyproline. The specific presence of hydroxyproline strongly contributes to the overall stability and rigidity of the collagen molecule.
These three distinct α-chains are then twisted around one another in a rope-like manner to produce the tightly packed triple-helical structure of collagen. The interaction of the α-chains is heavily stabilized via continuous interchain hydrogen bonding.
2. Function & Associated Diseases
Different isoforms of collagen form distinct structural networks across the body. Mutations or regulatory dysfunction in specific collagen types lead directly to severe, highly characterized connective tissue disorders.
| Collagen Type | Biological Function & Location | Associated Disease Pathology |
|---|---|---|
| Collagen I | Accounts for ~90% of the body's collagen, made of densely packed fibres. It provides structure to skin, bones, tendons, fibrous cartilage, and teeth. | Osteogenesis imperfecta (Brittle Bone Disease) - A genetic disorder resulting in highly fragile bones that break easily, typically present at birth. |
| Collagen II | Composed of more loosely packed fibres; it is the primary collagen found in elastic cartilage, providing critical cushioning to joints. | Chondrodysplasias - A group of severe conditions affecting skeletal development and growth, often linked to dwarfism. |
| Collagen III | Secreted by fibroblasts and other mesenchymal cell types. It forms reticular fibers and is a major player in inflammation-driven pathologies and wound healing. | Atopic Dermatitis & Fibrosis - heavily implicated in reactive skin conditions and viral/non-viral liver fibrosis. |
| Collagen IV | The main network-forming collagen found in the basement membrane. It underlies epithelial and endothelial cells, functioning as a structural barrier. | Ehlers-Danlos Syndrome (EDS) - A group of connective tissue conditions that cause hyper-flexible joints and stretchy, fragile skin. |
Rare & Unique Reactivity Options
Biorbyt possesses a highly validated and comprehensive range of Collagen proteins and antibodies, including difficult-to-source species reactivities such as Gallus (Chicken) Collagen I, Zebrafish Collagen I, and Guinea Pig Elastin. We also offer the hard-to-find Bovine Collagen I antibody for specific agricultural and veterinary research models.
3. Visualizing Collagen In Situ
Ensure reliable detection across tissue types. Below is a selection of highly validated Biorbyt antibodies showcasing distinct collagen expression natively in fixed tissues.
Collagen I Antibody
IHC-P image of mouse lymph node tissue using Collagen I antibody (5 μg/ml) - orb322979.
Collagen II Antibody
Immunofluorescence analysis of mouse lung tissue using Collagen II antibody (Dilution 1:300) - orb10436.
Collagen III Antibody
Immunohistochemical staining of paraffin embedded rat skin tissue using Collagen III antibody (2.5 μg/ml) - orb322981.
Collagen IV Antibody
IHC-P image of rat colon tissue identifying basement membrane architecture using Collagen IV antibody (2.5 μg/ml) - orb340147.
4. Essential Reagents Catalog
Explore our curated selection of top-performing products, or browse our entire Collagen catalog to find exactly what your research requires.
Featured Monoclonal Antibodies
| Cat. Code | Target | Host Species | Reactivity |
|---|---|---|---|
| orb2563523 | Collagen I | Mouse | Human |
| orb547486 | Collagen III | Mouse | Human |
| orb1415490 | Collagen IV | Mouse | Human |
Featured Polyclonal Antibodies
| Cat. Code | Target | Host Species | Reactivity |
|---|---|---|---|
| orb345345 | Collagen I | Rabbit | Human |
| orb867291 | Collagen I (Unique) | Rabbit | Gallus (Chicken) |
| orb867291 | Elastin | Rabbit | Human |
| orb345352 | Collagen IV | Rabbit | Bovine |
Top-Selling ELISA Kits
| Cat. Code | Target | Target Reactivity |
|---|---|---|
| orb345344 | Collagen I | Human |
| orb408836 | Collagen I | Mouse |
| orb404168 | Collagen II | Human |
| orb405761 | Collagen IV | Human |