NRG1 A Human
目录号 : GP20773Neuregulin-1/Heregulin Alpha（EGF 结构域）人类重组体
Sample solution is provided at 25 µL, 10mM.
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| Purity | Greater than 97.0% as determined by:(a) Analysis by RP-HPLC.(b) Analysis by SDS-PAGE. | Source | Escherichia Coli. |
| Phycical Appearance | Sterile Filtered White lyophilized (freeze-dried) powder. | Shipping Condition | Shipped at Room temp. |
| Synonyms | Neuregulin-1; Heregulin Alpha; NRG1-A; NRG1 A. | ||
| Amino Acid Sequence | SHLVKCAEKE KTFCVNGGEC FMVKDLSNPS RYLCKCQPGF TGARCTENVP MKVQNQEKAE ELYQK. | ||
| Solubility | It is recommended to reconstitute the lyophilized NRG1-A in sterile 18M-cm H2O not less than 100µg/ml, which can then be further diluted to other aqueous solutions. | ||
| Stability | Lyophilized NRG1-A although stable at room temperature for 3 weeks, should be stored desiccated below -18°C . Upon reconstitution NRG1-A should be stored at 4°C between 2-7 days and for future use below -18°C . Please prevent freeze-thaw cycles. | ||
| Biological Activity | The ED50 was determined by the dose-dependent stimulation of the proliferation of human MCF-7 cells is less than 40 ng/ml, corresponding to a specific activity of > 2.5б┴104 units/mg. | ||
| Formulation | Lyophilized from a 0.2µm filtered solution in 20mM PB, pH 6.0 and 150mM NaCl. | ||
Neuregulin/Heregulin is a family of structurally related polypeptide growth factors which are stemmed from alternatively spliced genes (NRG1, NRG2, NRG3 and NRG4). Thus far, there are more than 14 soluble and transmembrane proteins derived from the NRG1 gene. Proteolytic processing of the extracellular domain of the transmembrane NRG1 isoforms release soluble growth factors. These isoforms contain the heregulins (HRGs), glial growth factors (GGFs) and sensory and motor neuron-derived factor (SMDF). All these factors have the Ig and EGF-like domain, and are able to bind to ErbB3 and ErbB4 receptor tyrosin kinases. This binding stimulates erb3 and erb4 heterodimerization with erb2, promoting intrinsic kinase activity, which results in tyrosine phosphorylation. NRG1 isoforms act to induce the growth and differentiation of epithelial, neuronal, glial, and other types of cells.
The ED50 was determined by the dose-dependent stimulation of the proliferation of human MCF-7 cells is less than 40 ng/ml, corresponding to a specific activity of > 2.5б┴104 units/mg.
Lyophilized NRG1-A although stable at room temperature for 3 weeks, should be stored desiccated below -18°C . Upon reconstitution NRG1-A should be stored at 4°C between 2-7 days and for future use below -18°C . Please prevent freeze-thaw cycles.