BL21 star (DE3) pLysS菌株感受态细胞抗性价格报价Biovector菌株

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sequence map plasmid vector gene strain order ship抗性resistance restriction site

Description

One Shot® BL21 Star™ (DE3) pLysS E. coli are chemically competent cells designed for applications that require high-level expression of non-toxic recombinant proteins from high copy number, T7 promoter-based expression systems (e.g., pRSET T7 vectors). One Shot® BL21 Star™ (DE3) pLysS Chemically Competent cells have a transformation efficiency of >1 x 108 cfu/ µg plasmid DNA.
• High mRNA stability results in increased protein yield
• Ideal for use with high copy number, T7 promoter-based plasmids
• Low background expression in uninduced cells

Increased mRNA Stability Improves Protein Yield
One Shot® BL21 Star™ (DE3) pLysS E. coli offers enhanced mRNA stability so that abundant mRNA is available for protein expression. This enhanced stability is due to a mutation in the RNaseE gene (rne131), which is involved in mRNA degradation.

High Expression of Non-Toxic Recombinant Proteins
One Shot® BL21 Star™ (DE3) pLysS cells are ideal for high-level expression of non-toxic but potentially growth-inhibiting recombinant proteins from high copy number, T7 promoter-based expression systems. The pLysS CamR plasmid carried by the BL21 Star™ (DE3) pLysS strain expresses T7 lysozyme, a T7 RNA polymerase inhibitor that prevents leaky expression in uninduced cells. The p15a origin of pLysS makes this plasmid compatible with pUC or pBR322-derived plasmids. This strain also contains the DE3 lysogen that carries the T7 RNA polymerase gene under control of the lacUV5 promoter, and IPTG is required to induce expression of the T7 RNA polymerase. One Shot® BL21 Star™ (DE3) pLysS cells do not contain the lon protease and are also deficient in the outer membrane protease, OmpT. The absence of these proteases reduces degradation of heterologous proteins.

Note: 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. However, the BL21 Star™ (DE3) pLysS strains offer lower expression levels than the BL21 Star™ strains.

Genotype:
F-ompT hsdSB (rB-, mB-) galdcmrne131 (DE3) pLysS (CamR)

BL21(DE3)Star pLySs感受态细胞基本信息

出品公司:感受态细胞名称:菌株类型:产品目录号:培养基:生长条件:基因型:抗性:应用:菌株特点:

Invitrogen

BL21 Star(DE3)pLySs, BL21(DE3)Star pLySs

E.coli

C6020-03

LB培养基

37 ℃, 有氧

氯霉素

蛋白表达，IPTG诱导表达

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。

含有pLSs质粒，pLySs质粒能够产生T7溶菌酶，可以有效降低目的基因的基础表达水平。pLySs质粒使得该菌株具有氯霉素抗性。pLySs质粒的起始复制位点是p15 Origin, 这使得该质粒能够和pUC-及pBR322-衍生的质粒互相共存。

目的基因在菌株中的基础表达水平，一般是BL21 Star(DE3)要高于BL21 Star(DE3)pLySs，但是诱导后的总共的蛋白表达水平仍然是BL21 Star(DE3)要高于BL21 Star(DE3)pLySs。总得来说，目的基因的表达水平在BL21 Star(DE3)要高于在BL21 Star(DE3)pLySs中。

主要用来表达有毒蛋白或者对蛋白生长具有抑制作用的基因蛋白。

建议选择该菌株进行蛋白表达的条件如下：1. 你在使用高拷贝的T7启动子载体进行蛋白表达。2.使用BL21 Star(DE3)进行蛋白表达时，你观察到明显的对细菌生长的抑制作用。3.你在表达一个已知的毒性蛋白。