Overview
Fibrillin is a family of extracellular matrix glycoproteins critical for the structural integrity of connective tissues. Primarily known as fibrillin-1 (FBN1) and fibrillin-2 (FBN2), these proteins form the backbone of microfibrils, which provide elasticity to tissues like the aorta, ligaments, and ocular zonules. Discovered in the 1980s, fibrillin gained prominence due to its association with Marfan syndrome, a genetic disorder caused by FBN1 mutations. In B2B contexts, fibrillin is supplied primarily for research applications, including studies on extracellular matrix biology and genetic diseases. Recombinant fibrillin isoforms are produced by specialized biotech firms, often with custom modifications for specific experimental needs.
Physical and Chemical Properties
Fibrillin proteins are characterized by multiple calcium-binding epidermal growth factor (cbEGF) domains and cysteine-rich regions, which confer stability and interaction sites for other matrix components. The proteins self-assemble into 10–12 nm microfibrils in vivo, a process dependent on disulfide bonds and calcium ions. Purified fibrillin is typically lyophilized to preserve its functionality. It exhibits limited solubility in aqueous buffers at neutral pH but aggregates under acidic conditions. Analytical techniques like SDS-PAGE and mass spectrometry are used to verify its molecular weight and purity, which are critical for reproducible research outcomes.
Main Applications
In biomedical research, fibrillin is studied for its role in Marfan syndrome, Weill-Marchesani syndrome, and other connective tissue disorders. It serves as a biomarker in diagnostic assays and a substrate for tissue engineering scaffolds aiming to replicate elastic tissue properties. Pharmaceutical companies investigate fibrillin mutations to develop targeted therapies, such as TGF-β inhibitors for Marfan syndrome. Additionally, recombinant fibrillin is used in vitro to study cell-matrix interactions, particularly in cardiovascular and ophthalmology research.
Safety and Storage
While fibrillin is not classified as hazardous, proper handling with gloves and lab coats is advised to prevent contamination. Lyophilized samples should be reconstituted in sterile, calcium-containing buffers to maintain functionality. Long-term storage requires temperatures below -20°C, with aliquoting recommended to avoid repeated freeze-thaw cycles. Suppliers often provide certificates of analysis (CoA) detailing endotoxin levels (<1 EU/mg for cell culture) and purity. For B2B buyers, verifying these specifications ensures compliance with experimental protocols and reduces batch-to-batch variability.
B2B Procurement Guide
When sourcing fibrillin, prioritize suppliers with ISO 13485 certification for consistent quality. Key procurement criteria include isoform specificity (FBN1 vs. FBN2), purity (>90% for most applications), and endotoxin levels. Custom modifications (e.g., fluorescent labeling) may be available for specialized studies. Pricing varies significantly based on quantity and purity; bulk purchases (10+ mg) often reduce costs by 20–30%. Lead times can extend to 8–12 weeks for recombinant variants due to complex purification processes. Establish supplier relationships to secure priority access and technical support for troubleshooting.
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