Overview
Human fibrillin is a extracellular matrix glycoprotein primarily encoded by the FBN1 gene. It serves as the scaffolding for elastin deposition, enabling tissues like arteries and ligaments to withstand repetitive stretching. Three isoforms (FBN1–3) exist, with FBN1 mutations linked to Marfan syndrome. First isolated in 1986, fibrillin’s cysteine-rich structure forms disulfide-bonded microfibrils. These microfibrils are critical during embryogenesis and tissue repair, making fibrillin a focus of developmental biology and regenerative medicine research.
Physical and Chemical Properties
Fibrillin-1 is a 350 kDa protein with 47 epidermal growth factor (EGF)-like domains, 43 of which bind calcium. This modular structure confers resistance to proteolytic degradation. The protein’s solubility depends on pH and ionic strength, requiring buffers like Tris or PBS for stabilization. Its microfibrils exhibit 10–12 nm diameter under electron microscopy. The protein’s thermal stability is moderate, degrading above 60°C. Calcium binding enhances structural rigidity, crucial for its mechanical role in tissues.
Main Applications
In research, recombinant fibrillin aids in studying connective tissue disorders, notably Marfan syndrome and Weill-Marchesani syndrome. Biotechnology applications include engineered matrices for vascular grafts due to its elastogenic properties. Clinically, fibrillin-1 fragments serve as biomarkers for aortic aneurysms. In cosmetics, hydrolyzed fibrillin peptides are explored for anti-aging formulations to improve skin elasticity.
Safety and Storage
Lyophilized fibrillin is stable for years at -20°C but requires argon flushing to prevent oxidation. Solutions should include 1–5 mM CaCl₂ to maintain conformation and inhibitors like PMSF to prevent proteolysis. While non-hazardous, airborne particles may cause respiratory irritation. Use nitrile gloves and safety goggles during handling. Dispose via biohazard protocols if derived from human tissue.
B2B Procurement Guide
Research-grade fibrillin is available from suppliers like Sigma-Aldrich and R&D Systems. Key specifications include: isoform (FBN1 dominates the market), purity (>95% by SDS-PAGE), and endotoxin levels (<0.1 EU/μg for cell culture). Bulk orders (10+ mg) often qualify for 15–30% discounts. For custom modifications (e.g., fluorescent labeling), lead times extend to 8–12 weeks. Verify chain-of-custody documentation for clinical-grade material.
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