BL21 Star(DE3)大肠杆菌表达菌使用说明：
质粒平台的各批次质粒菌株发货前均经过严格的多重验证，如存在质量问题，请在收到产品三个月内通知我司。收到甘油菌后，请及时在固体平板上划线培养，挑取单菌落接种到液体培养基中，震荡培养后使用并保存甘油菌。如需获取其他详细信息请登录我司官网联系QQ客服查询。

基因型：
F- ompT hsdSB (rB-, mB-) gal dcm rne131 (DE3)

BL21 Star(DE3)大肠杆菌表达菌基本信息：
抗性：无
培养基：LB
菌株类别：大肠杆菌
培养条件：37℃，有氧，LB
质粒转化：42℃热激
保存方式：20%甘油，-20℃
基本应用：用于蛋白表达
备注：

BL21 Star(DE3)大肠杆菌表达菌菌株简介：
BL21 Star (DE3) E. coli are chemically competent cells designed for applications that require high-level expression of non-toxic recombinant proteins from low copy number, T7 promoter-based expression systems (e.g., Champion™ pET vectors). BL21 Star (DE3) Chemically Competent cells are controlled for a transformation efficiency of 1 x 108 cfu/µg plasmid DNA.
• A genotype that promotes high mRNA stability and protein yield
• Ideal for use with low copy number, T7 promoter-based plasmids
• The single tube, single use format allows all transformation steps to take Enhanced Expression of Non-Toxic Recombinant Proteins
BL21 Star (DE3) cells contain the DE3 lysogen that carries the gene for T7 RNA polymerase under control of the lacUV5 promotor, and IPTG is required to induce expression. This strain also offers enhanced mRNA stability due to a mutation in the RNaseE gene (rne131), which reduces levels of endogenous RNases and mRNA degradation, thereby increasing the stability of mRNA transcripts and increasing protein yield. Protein expression is further enhanced by the absence of the lon and outer membrane (OmpT) proteases, which reduces degradation of heterologous proteins.
The BL21 Star strains have higher basal expression of heterologous genes than BL21 strains, due to the increased stability of mRNA. Therefore, these strains may not be useful for expression of toxic genes.
BL21 Star(DE3)来源于BL21(DE3)菌株, 含有rne131基因突变体，rne131突变基因能够增强菌株细胞内mRNA的稳定性，从而有效提高蛋白表达能力。
主要适用于T7启动子载体的高水平蛋白表达。

BL21 Star(DE3)大肠杆菌表达菌注意事项：
1、为了您的安全和健康，请穿实验服并戴一次性手套操作。本产品仅可用于实验室研究，不能用于动物，人体以及作为食品添加剂等用途。
2、使用甘油菌时可不完全融解，在甘油菌表面蘸取少量涂布固体琼脂平板即可，也可完全融解后使用，但随着冻融次数的增加，菌株的活力会逐渐下降。