Midkine is a heparin-binding growth factor, which contains 121 amino acid residues with 5 disulfide bonds. Midkine promotes the growth, survival, and migration of various cells, and plays roles in neurogenesis and epithelial mesenchymal interactions during organogenesis. The C-terminal portion contains the heparin-binding domain and the antigenicity and neurite-promoting sequences. Both the C- and N-terminals are necessary for the molecule′s neurotrophic effects.
Fully biologically active when compared to standard. The biological activity determined by a chemotaxis bioassay using human neutrophils is in a concentration range of 10-100 ng/ml.
Expression system : E. coli
Accession: P12025
Approximately Molecular Weight: 13.2 kDa, a single non-glycosylated polypeptide chain containing 120 amino acids.
AA Sequence:
VAKKKEKVKK GSECSEWTWG PCTPSSKDCG MGFREGTCGA QTQRVHCKVP CNWKKEFGAD CKYKFESWGA CDGSTGTKAR QGTLKKARYN AQCQETIRVT KPCTSKTKSK TKAKKGKGKD
Lyophilized from a 0.2 μm filtered concentrated solution in 2 × PBS, pH7.4.
| Solubility (25°C) | 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. |
| Storage | Stable for up to twelve months from date of receipt at -20℃ to -70℃. Reconstituted protein solution can be stored at 2-8°C for 2 weeks, at ≤ -20°C for 3 months. |
| Species | Mouse | Rat | Rabbit | Guinea pig | Hamster | Dog |
| Weight (kg) | 0.02 | 0.15 | 1.8 | 0.4 | 0.08 | 10 |
| Body Surface Area (m2) | 0.007 | 0.025 | 0.15 | 0.05 | 0.02 | 0.5 |
| Km factor | 3 | 6 | 12 | 8 | 5 | 20 |
| Animal A (mg/kg) = Animal B (mg/kg) multiplied by | Animal B Km |
| Animal A Km |
For example, to modify the dose of Compound A used for a mouse (20 mg/kg) to a dose based on the BSA for a rat, multiply 20 mg/kg by the Km factor for a mouse and then divide by the Km factor for a rat. This calculation results in a rat equivalent dose for Compound A of 10 mg/kg.
[2] S Kojima, et al. J Biol Chem. Midkine enhances fibrinolytic activity of bovine endothelial cells
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