名称：重组人FGF-23
Species：9
Accession：Q9GZV9
GeneID：8074
Source：Escherichia coli.
Molecular Weight：Approximately 25.3 kDa, a single non-glycosylated polypeptide chain containing 227 amino acids.
Quantity：5µg/20µg/1000µg
AA Sequence：YPNASPLLGS SWGGLIHLYT ATARNSYHLQ IHKNGHVDGA PHQTIYSALM IRSEDAGFVV ITGVMSRRYL CMDFRGNIFG SHYFDPENCR FQHQTLENGY DVYHSPQYHF LVSLGRAKRA FLPGMNPPPY SQFLSRRNEI PLIHFNTPIP RRHTRSAEDD SERDPLNVLK PRARMTPAPA SCSQELPSAE DNSPMASDPL GVVRGGRVNT HAGGTGPEGC RPFAKFI
Purity：> 95 % by SDS-PAGE and HPLC analyses.
Biological Activity：Fully biologically active when compared to standard. The ED50 as determined by thymidine uptake assay using FGF-receptors transfected BaF3 cells is less than 0.5 μg/ml, corresponding to a specific activity of > 2.0 × 103 IU/mg in the presence of 0.3 μg/ml of rMuKlotho and 10 μg/ml of heparin.
Physical Appearance：Sterile Filtered White lyophilized (freeze-dried) powder.
Formulation：Lyophilized from a 0.2 µm filtered concentrated solution in PBS, pH 7.4.
Endotoxin：Less than 1 EU/µg of rHuFGF-23 as determined by LAL method.
Reconstitution：We recommend that this vial be briefly centrifuged prior to opening to bring the contents to the bottom. Reconstitute in sterile distilled water or aqueous buffer containing 0.1 % BSA to a concentration of 0.1-1.0 mg/ml. Stock solutions should be apportioned into working aliquots and stored at ≤ -20 °C. Further dilutions should be made in appropriate buffered solutions.
Stability & Storage：Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
- 12 months from date of receipt, -20 to -70 °C as supplied.
- 1 month, 2 to 8 °C under sterile conditions after reconstitution.
- 3 months, -20 to -70 °C under sterile conditions after reconstitution.
Reference：1. Smallwood PM, Munoz-Sanjuan I, Tong P, et al. 1996. Proc Natl Acad Sci U S A. 93:9850-7.
2. Fu L, John LM, Adams SH, et al. 2004. Endocrinology. 145:2594-603.
3. Kharitonenkov A, Shiyanova TL, Koester A, et al. 2005. J Clin Invest. 115:1627-35.
4. Kurosu H, Kuro OM. 2009. Mol Cell Endocrinol. 299:72-8.
5. Lin BC, Wang M, Blackmore C, et al. 2007. J Biol Chem. 282:27277-84.
6. Kharitonenkov A, Dunbar JD, Bina HA, et al. 2008. J Cell Physiol. 215:1-7.
7. Riminucci M, Collins MT, Fedarko NS, et al. 2003. J Clin Invest. 112:683-92.
8. Shimada T, Hasegawa H, Yamazaki Y, et al. 2004. J Bone Miner Res. 19:429-35.
Background：Human FGF-23 belongs to the FGF-19 subfamily which has three members FGF-19, 21, 23. All FGF family members are heparin binding growth factors with a core 120 amino acid (a.a.) FGF domain that allows for a common tertiary structure. They are classically considered to be paracrine factors and are known for their roles in tissue patterning and organogenesis during embryogenesis. By contrast, the FGF-19 subfamily has recently been shown to function in an endocrine manner. Members of this subfamily have poor ability of binding to heparin binding site which is a crucial factor in ligand-receptor complex formation. β-Klotho has been identified as co-factor required for FGF-19, 21, 23 signaling. It can obviously increase ligand-receptor affinity. FGF-23 is most highly expressed in bone, from which it circulates through the blood to regulate vitamin D and phosphate metabolism in kidney.