- Other Names
- Fibronectin, FN, FN1, Cold-insoluble globulin, CIG, Large external transformation-sensitive protein, LETS
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- Product Citations
Fibronectin (FN) is an adhesive glycoprotein found as insoluble components of the extracellular matrix (ECM) or as soluble dimeric forms in plasma. Fibronectin binds chondroitin sulfate, collagen, fibrin, heparin, and many integrin receptors through which it mediates multiple cellular signaling pathways. Conversion of soluble fibronectin to fibronectin fibrils is initiated by binding to cell surface integrins. Fibronectin is involved in cell adhesion, cell motility, wound healing and maintenance of cell morphology. It also participates in osteoblast compaction and is essential for osteoblast mineralization. Fibronectin is thought to play a role in platelet thrombus formation and other diseases associated with thrombosis including atherosclerosis and cardiac repair following a myocardial infarct. Fibronectin plays an important role in coordinating interaction between the ECM and cancer cells in tumors. Its upregulation enhances cancer cell survival, proliferation, and invasion. Fibronectin monomers consist of three types of homologous repeats, type I, II and III domains. A fragment from the first type III repeat, known as Anastellin, binds to fibronectin and induces fibril formation named superfibronectin. Superfibronectin exhibits enhanced adhesive properties and inhibits tumor growth, angiogenesis and metastasis.Product Details
- Human FN-1, amino acids Gln32-Pro1991 (Accession # BC117176) with a C-terminal 8His-GGQ tag was expressed in 293E cells.
- Molecular Mass
- The 1973 amino acid recombinant protein has a predicted molecular mass of approximately 217 kD. The DTT-reduced and non-reduced protein protein migrates at approximately 180 – 220 kD by SDS-PAGE. The predicted N-terminal amino acid is Gln.
- >95%, as determined by Coomassie stained SDS-PAGE.
- 0.22 µm filtered protein solution is in PBS, pH 7.2
- Endotoxin Level
- Less than 0.1 EU per µg protein as determined by the LAL method.
- 100 µg and larger sizes are lot-specific and bottled at the concentration indicated on the vial (please contact technical support for concentration, or use our Lookup tool if you have a lot number.)
- Storage & Handling
- Unopened vial can be stored between 2°C and 8°C for up to 2 weeks, at -20°C for up to six months, or at -70°C or colder until the expiration date. For maximum results, quick spin vial prior to opening. The protein can be aliquoted and stored at -20°C or colder. Stock solutions can also be prepared at 50 - 100 µg/mL in appropriate sterile buffer, carrier protein such as 0.2 - 1% BSA or HSA can be added when preparing the stock solution. Aliquots can be stored between 2°C and 8°C for up to one week and stored at -20°C or colder for up to 3 months. Avoid repeated freeze/thaw cycles.
- ED50= 15 - 60 ng/mL as measured by the ability of immobilized protein to support the adhesion of L929 cells. Calcein-AM (Cat. No. 425201) was used to measure the number of adherent cells.
- Application Notes
BioLegend carrier-free recombinant proteins provided in liquid format are shipped on blue ice. Our comparison testing data indicates that when handled and stored as recommended, the liquid format has equal or better stability and shelf-life compared to commercially available lyophilized proteins after reconstitution. Our liquid proteins are verified in-house to maintain activity after shipping on blue ice and are backed by our 100% satisfaction guarantee. If you have any concerns, contact us at firstname.lastname@example.org.
Plasma FN (soluble dimeric form) is secreted by hepatocytes. Cellular FN (dimeric or cross-linked multimeric forms), made by fibroblasts, epithelial and other cell types, is deposited as fibrils in the extracellular matrix.
- Fibronectins bind cell surfaces and various compounds including collagen, fibrin, heparin, DNA, and actin.
- Cell surface, collagen, fibrin, heparin, DNA, and actin.
- Supports the adhesion of L929 cells.
- Biology Area
- Angiogenesis, Cancer Biomarkers, Cell Biology, Cell Motility/Cytoskeleton/Structure, Neuroscience Cell Markers
- Gene ID
- 2335 View all products for this Gene ID
- View information about FN-1 on UniProt.org
- Does specific activity of a recombinant protein vary between lots?
Specific activity will vary for each lot and for the type of experiment that is done to validate it, but all passed lots will have activity within the established ED50 range for the product and we guarantee that our products will have lot-to-lot consistency. Please conduct an experiment-specific validation to find the optimal ED50 for your system.
- Have your recombinants been tested for stability?
Our testing shows that the recombinant proteins are able to withstand room temperature for a week without losing activity. In addition the recombinant proteins were also found to withstand four cycles of freeze and thaw without losing activity.
- How do you convert activity as an ED50 in ng/ml to a specific activity in Units/mg?
- Use formula Specific activity (Units/mg) = 10e6/ ED50 (ng/mL)
- How does the activity of your recombinant proteins compare to competitors?
We quality control each and every lot of recombinant protein. Not only do we check its bioactivity, but we also compare it against other commercially available recombinant proteins. We make sure each recombinant protein’s activity is at least as good as or better than the competition’s. In order to provide you with the best possible product, we ensure that our testing process is rigorous and thorough. If you’re curious and eager to make the switch to BioLegend recombinants, contact your sales representative today!
- What is the specific activity or ED50 of my recombinant protein?
The specific activity range of the protein is indicated on the product datasheets. Because the exact activity values on a per unit basis can largely fluctuate depending on a number of factors, including the nature of the assay, cell density, age of cells/passage number, culture media used, and end user technique, the specific activity is best defined as a range and we guarantee the specific activity of all our lots will be within the range indicated on the datasheet. Please note this only applies to recombinants labeled for use in bioassays. ELISA standard recombinant proteins are not recommended for bioassay usage as they are not tested for these applications.