■ 產(chǎn)品介紹
Tuner strains are lacZY deletion mutants of BL21 and enable adjustable levels of protein expression throughout all cells in a culture. The lac permease (lacY) mutation allows uniform entry of IPTG into all cells in the population, which produces a concentration-dependent, homogeneous level of induction. By adjusting the concentration of IPTG, expression can be regulated from very low levels up to the robust, fully induced levels commonly associated with pET vectors. Lower-level expression may enhance the solubility and activity of difficult target proteins. DE3 indicates that the host is a lysogen of λDE3, and therefore carries a chromosomal copy of the T7 RNA polymerase gene under control of the lacUV5 promoter. Such strains are suitable for production of protein from target genes cloned in pET vectors by induction with IPTG. pLysS strains express T7 lysozyme, which further suppresses basal expression of T7 RNA polymerase prior to induction, thus stabilizing pET recombinants encoding target proteins that affect cell growth and viability. |
基因型： | F– ompT hsdSB (rB– mB–) gal dcm lacY1(DE3) pLysS (CamR) |
■ 基本信息
抗性: | Chl |
培養基: | LB |
菌株類(lèi)別: | 大腸桿菌 |
培養條件: | 37℃，有氧，LB |
質(zhì)粒轉化: | 42℃熱激 |
保存方式: | 20%甘油，-20℃ |
基本應用: | 用于蛋白表達 |
■ 使用方法
建議超凈臺內劃線(xiàn)涂板，得到單克隆后再進(jìn)行其他實(shí)驗操作，避免雜菌污染。
■ 注意事項
1. 本產(chǎn)品僅可用于實(shí)驗室研究，不能用于動(dòng)物，人體以及作為食品添加劑等用途。
2. 為了您的安全和健康，請穿實(shí)驗服并戴一次性手套操作。
3. 使用甘油菌時(shí)可不完全融解，在甘油菌表面蘸取少量涂布固體瓊脂平板即可，也可完全融解后使用，但隨著(zhù)凍融次數的增加，菌株的活力會(huì )逐漸下降。
