Recombinant Human Follistatin-Resistant Activin A Protein
Recommended Products
There are no recommended products for Recombinant Human Follistatin-Resistant Activin A Protein
Overview
Follistatin-resistant activin A (FRACTA) protein has been engineered to prevent binding to the natural inhibitor, follistatin. In vivo activin A activity is regulated by follistatin, a high-affinity inhibitor; follistatin accumulates in stem cell culture, where it inhibits activin A.
Qk035 follistatin-resistant activin A (FRACTA) has equivalent bioactivity to wild-type activin A (Qk001) but does not bind follistatin so is resistant to feedback inhibition. High purity 26 kDa dimer comprising engineered mature domain of activin A protein, animal origin-free (AOF) and carrier-protein free (CF). This specialized activin A has been developed in Marko Hyvönen’s group in the University of Cambridge.
Download the Product Data Sheet for species reactivity, reconstitution instructions, bioactivity, purity, and additional product information.
Contact us for Quality and Safety documentation or for information on cell therapy grade growth factors and cytokines.
Product Features
- High purity engineered follistatin-resistant activin A (FRACTA) protein
- 26 kDa (dimer)
- >98%, by SDS-PAGE quantitative densitometry
- Expressed in E. coli
- Animal origin-free (AOF) and carrier protein-free
- Manufactured in Qkine’s Cambridge, UK laboratories
- Lyophilized from acetonitrile, TFA
- Resuspend in 10 mM HCl (Reconstitution solution A) at >50 µg/ml, add carrier protein if desired, prepare single-use aliquots and store frozen at -20 °C (short-term) or -80 °C (long-term)
Featured Applications
- Induced pluripotent and embryonic stem cell differentiation and maintenance
RoosterBio is a distributor of Qkine growth factors and cytokines within the United States. For regional-specific orders, please contact us for more information.
Login to search Certificates of Analysis and Quality Control Briefs.
How do I store my proteins?
- Lyophilized store at -20°C or -80°C for up to 2 years
- Reconstituted store at -20 °C or -80 °C
- We recommend that single use aliquots are prepared to avoid freeze-thaw cycles
How do I reconstitute lyophilized protein?
- Check the resuspension solution recommendation on the product datasheet.*
- Centrifuge briefly before reconstituting to ensure all powder is at the bottom of the vial.
- Add sufficient reconstitution solution to give a protein concentration of 0.05–1.0 mg/ml.
- Allow the reconstituted sample to stand at room temperature for >1 minute before gently agitating. Do not vortex and avoid foaming.
- Prepare single-use aliquots whenever possible to avoid freeze-thaw cycles, which can damage the proteins and reduce bioactivity. Store aliquots at -80°C (or -20°C).**
NOTES
*Physiological buffers may cause precipitation of proteins during reconstitution. This is especially important for TGF beta family and other related growth factors, so it is very important that these are reconstituted in Solution A (10 mM HCl, 1:1000 dilution of concentrated HCl).
**All our proteins are supplied carrier protein-free. If compatible with your work and you are storing at lower concentrations (<50 μg/ml), adding carrier protein is highly advised (usually 1% w/v high purity BSA or equivalent – ensure all buffers are sterile-filtered).