| Description : |
Thrombopoietin (Tpo), the ligand for the receptor encoded by the c-Mpl proto-oncogene, is a key regulator of megakaryocytopoiesis and thrombopoiesis in vitro and in vivo. The cDNAs for Tpo have recently been cloned from canine, murine and human sources. The proteins from these three species are highly conserved, exhibiting from 69-75% sequence identity at the amino acid level. Human Tpo cDNA encodes a 353 amino acid residue protein with a 21 amino acid residue signal peptide that is cleaved to yield the 332 amino acid residue mature protein. Two distinct domains, separated by a pair of arginine residues that may be a proteolytic cleavage site, have been identified in Tpo: the amino terminal region exhibiting sequence homology to erythropoietin and the carboxy terminal region containing multiple potential N-linked glycosylation sites. |
| Source : |
CHO |
| Species : |
Human |
| Form : |
Sterile Filtered White lyophilized (freeze-dried) powder. |
| Bio-activity : |
Fully biologically active when compared to standard. The ED50 as determined by the dose-dependant stimulation of Mo7e cells is typically 1-3 ng/mL, corresponding to a Specific Activity of ＞1 × 10^6 IU/mg. |
| Molecular Mass : |
Approximately 80 kDa, consisting of a 332 amino acid residue with a predicted molecular mass of approximately 35 kDa. As a result of glycosylation, the recombinant protein migrates with an apparent molecular mass of 80±10 kDa in SDS-PAGE. |
| Protein Length : |
332 |
| AA Sequence : |
SPAPPACDLRVLSKLLRDSHVLHSR LSQCPEVHPLPTPVLLPAVDFSLGE WKTQMEETKAQDILGAVTLLLEGVM AARGQLGPTCLSSLLGQLSGQVRLL LGALQSLLGTQLPPQGRTTAHKDPN AIFLSFQHLLRGKVRFLMLVGGSTL CVRRAPPTTAVPSRTSLVLTLNELP NRTSGLLETNFTASARTTGSGLLKW QQGFRAKIPGLLNQTSRSLDQIPGY LNRIHELLNGTRGLFPGPSRRTLGA PDISSGTSDTGSLPPNLQPGYSPSP THPPTGQYTLFPLPPTLPTPVVQLH PLLPDPSAPTPTPTSPLLNTSYTHS QNLSQEG |
| Endotoxin : |
Less than 1 EU/mg of rHuTPO a as determined by LAL method. |
| Purity : |
>98% by SDS-PAGE and HPLC analyses. |
| Storage : |
This lyophilized preparation is stable at 2-8 centigrade, but should be kept at -20 centigrade for long term storage, preferably desiccated. Upon reconstitution, the preparation is stable for up to one week at 2-8 centigrade. For maximal stability, apportion the reconstituted preparation into working aliquots and store at -20 to -70 centigrade. Avoid repeated freeze/thaw cycles. |
| Storage Buffer : |
Lyophilized from a 0.2mm filtered concentrated solution in PBS, pH 7.4. |
| 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. |
