Tuner(DE3)，Tuner(DE3)感受态细胞

Tuner(DE3)感受态细胞

Tuner(DE3)Chemically Competent Cell 产品说明书

Tuner(DE3)感受态细胞产品规格

Tuner（DE3）：                       10×100μl

pUC19（control vector）：10pg/μl            10μl

保存条件：-80℃

Tuner(DE3)感受态细胞基因型

F- ompT hsdSB(rB- mB- ) gal dcm lacY1 (DE3)

Tuner(DE3)感受态细胞产品说明

Tuner（DE3）菌株是BL21菌株的 lacZY基因（半乳糖苷透性酶基因）突变株，此突变导致IPTG以均一速度进入体系中大肠杆菌的每个细胞，产生更加严格、均一的浓度依赖。此菌株用于高效表达克隆于含有噬菌体T7启动子的表达载体(如pET系列)的基因。λ噬菌体DE3区含有T7噬菌体RNA聚合酶，该区整合于Tuner的染色体上，所以称为Tuner（DE3） ，可同时表达T7 RNA聚合酶和大肠杆菌RNA聚合酶，可用于pET系列，pGEX，pMAL等质粒的蛋白表达。High5TM系列Tuner（DE3）感受态细胞由特殊工艺制作，经pUC19质粒检测转化效率达107cfu/μg。

Tuner(DE3)感受态细胞操作方法

1. 取100μl冰上融化的Tuner（DE3）感受态细胞，加入目的质粒并轻轻混匀，冰上静置25分钟。

2. 42℃水浴热激45秒，迅速放回冰上并静置2分钟，晃动会降低转化效率。

3. 向离心管中加入700μl不含抗生素的无菌培养基（2YT或LB），混匀后37℃，200rpm复苏60分钟。

4. 5000rpm离心一分钟收菌，留取100μl左右上清轻轻吹打重悬菌块并涂布到含相应抗生素的2YT或LB培养基上。

5. 将平板倒置放于37℃培养箱过夜培养。

Sample Induction Protocol (for reference only)

1.   Inoculate a single colony from a freshly streaked plate into 5 ml of LB medium containing the appropriate antibiotic for the plasmid and host strain.

2.   Incubate with shaking at 200 rpm at 37℃ overnight. 

3.   Inoculate 50 ml of LB medium containing the appropriate antibiotic with 0.5 ml of the overnight culture prepared in step 2(use the 500 ml triangular flask as the container would be better).

4.   Incubate with shaking at 150 rpm at 37℃ until the OD 600 reaches 0.5-0.8.

5.   (Optional)Pipet 1ml of  the cultures into clean microcentrifuge tubes and  place the tubes on ice until  needed  for gel analysis or storage at  -20℃. These will serve as the non-induced control samples.     

6.   Add IPTG to a final concentration of 1 mM.  Optimal time for induction of the target protein may vary from 2-16 hours, depending on the protein.

7.   Incubate with shaking at 120 rpm at 37℃ for 3-4 hours. To determine the optimal time for induction of the target protein, it is recommended that a time course experiment be performed varying the induction from 2-16 hours.

8.   Place the culture on ice for 10 minutes. Harvest cells by centrifugation at 5,000 x g for 10

minutes at 4℃.

9.   Remove the supernatant and store the cell pellet at -20℃ (storage at lower temperatures is also acceptable). 

IPTG

Prepare a 1 M solution of IPTG (Isopropyl-β-D-thiogalactoside; Isopropyl-β-D-thiogalactopyranoside) by

dissolving 2.38 g of IPTG in dd water and adjust the final volume to 10 ml. Filter sterilize before use. 

Tuner(DE3)感受态细胞注意事项：

1. 感受态细胞最好在冰上融化。

2. 混入质粒时应轻柔操作。

3. 转化高浓度的质粒可相应减少最终用于涂板的菌量。

4. 诱导时，IPTG浓度可选（0.1-40mM均可）。

5. 为获得需要量的蛋白，最佳诱导时间，温度，IPTG浓度需实验者优化。

华越洋其他感受态细胞：