| Description : |
Pigment epithelium-derived factor (PEDF) is encoded by the SERPINF1 gene in humans and found in verebrates. It is a secreted phosphoglycoprotein that belongs to the clade F subfamily, serpin superfamily of proteinase inhibitors. The PEDF is a noninhibitory serpin with neurotrophic, anti-angiogenic, and anti-tumorigenic properties. It is synthesized as a 418 a.a. about 50kDa precursor that contains a 19 a.a. signal sequence and a 399 a.a. mature region that shows a pyroglutamate at Gln20. Like other serpins, it contains three β-sheets, 810 α-helices, and a C-terminal RCL (reactive center loop). Unlike other serpins with Ser protease inhibiting activity. PEDF has functions of inducing extensive neuronal differentiation in retinoblastoma cells, inhibiting of angiogenesis. As it does not undergo the S (stressed) to R (relaxed) conformational transition characteristic of active serpins, it exhibits no serine protease inhibitory activity. PEDF is researched as a therapeutic candidate for treatment of such conditions as choroidal neovascularization, heart disease, and cancer. |
| Source : |
E.coli |
| Species : |
Human |
| Form : |
Lyophilized from a 0.2μm filtered concentrated solution in 20 mM PB, pH 7.4, 150 mM NaCl. |
| Bio-activity : |
Fully biologically active when compared to standard. The ED50 as determined by its ability to enhance the adhesion of human Saos2 cells to bovine Collagen I coated plate is less than 2 ng/ml, corresponding to a specific activity of > 5.0 × 10⁵ IU/mg. |
| Molecular Mass : |
Approximately 44.4 KDa, a single non-glycosylated polypeptide chain containing 399 amino acids. |
| Protein length : |
399 |
| AA Sequence : |
QNPASPPEEGSPDPDSTGALVEEED PFFKVPVNKLAAAVSNFGYDLYRVR SSTSPTTNVLLSPLSVATALSALSL GAEQRTESIIHRALYYDLISSPDIH GTYKELLDTVTAPQKNLKSASRIVF EKKLRIKSSFVAPLEKSYGTRPRVL TGNPRLDLQEINNWVQAQMKGKLAR STKEIPDEISILLLGVAHFKGQWVT KFDSRKTSLEDFYLDEERTVRVPMM SDPKAVLRYGLDSDLSCKIAQLPLT GSMSIIFFLPLKVTQNLTLIEESLT SEFIHDIDRELKTVQAVLTVPKLKL SYEGEVTKSLQEMKLQSLFDSPDFS KITGKPIKLTQVEHRAGFEWNEDGA GTTPSPGLQPAHLTFPLDYHLNQPF IFVLRDTDTGALLFIGKILDPRGP |
| Endotoxin : |
Less than 1 EU/μg of rHuPEDF as determined by LAL method. |
| Purity : |
>97% by SDS-PAGE and HPLC analysis. |
| Storage : |
Use a manual defrost freezer and avoid repeated freeze-thaw cycles. 12 months from date of receipt, -20 to -70 centigrade as supplied. 1 month, 2 to 8 centigrade under sterile conditions after reconstitution. 3 months, -20 to -70 centigrade under sterile conditions after reconstitution. |
| 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 centigrade. Further dilutions should be made in appropriate buffered solutions. |
