背景说明: neuregulin-1 (heregulin-1，NRG1) is a member of neuregulin family, which is comprised of four genes that encode a large number of secreted or membrane-bound isoforms. All family members share an EGF-like domain that interacts with the ErbB family of tyrosine kinase receptors. NRG1 isoforms can be classified into type I, type II and type III isoforms. NRG1 directs ligand for ERBB3 and ERBB4 tyrosine kinase receptors, concomitantly recruits ERBB1 and ERBB2 coreceptors, resulting in ligand-stimulated tyrosine phosphorylation and activation of the ERBB receptors. NRG proteins show distinct spatial and temporal expression patterns and play important roles during development of both the nervous system and the heart.
纯度: Greater than 95% as determined by reducing SDS-PAGE.
来源: Escherichia coli.
内毒素水平: Less than 0.1 ng/μg (1 IEU/μg) as determined by LAL test.
活性: Measured in a serum-free cell proliferation assay using MCF-7 human breast cancer cells. The ED50 for this effect is less than 5 ng/ml
溶解方法: Always centrifuge tubes before opening. Do not mix by vortex or pipetting. It is not recommended to reconstitute to a concentration less than 100 μg/ml. Dissolve the lyophilized protein in ddH2O. Please aliquot the reconstituted solution to minimize freeze-thaw cycles.
形态: Lyophilized from a 0.2 μm filtered solution of PBS,pH7.4.