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NovaBlue(DE3)

文字:[大][中][小] 2017-11-14    浏览次数:1141    

NoveBlue(DE3) Chemically Competent Cell 产品说明书




产品规格 (CAT#: EC1080)

NovaBlue(DE3):                                        100μl/支

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

保存条件(保质期):                             -80℃(6个月) 


基因型

F`[ proA+B+ lacIq ZΔM15::Tn10 (TetR)] endA1 hsdR17(rk12-,mk12+) supE44 thi -1 recA1 gyrA96 relA1 lac(DE3)



产品说明

NovaBlue(DE3)来源于K12菌株,具有极高的转化效率,是转化效率最高的原核表达菌株,可同时用于普通质粒的构建和蛋白的原核表达。NovaBlue(DE3)菌株染色体DNA中整合了λ噬菌体DE3区,使得NovaBlue(DE3)菌株可同时表达T7 RNA聚合酶和大肠杆菌RNA聚合酶,广泛用于pET系列,pGEX,pMAL等质粒的蛋白表达。NovaBlue(DE3)菌株具有四环素抗性,endA1和recA1的突变有利于插入DNA的稳定和高纯度质粒DNA的提取;lacZΔM15的存在使NovaBlue(DE3)可用于蓝、白斑筛选。唯地生物生产的NovaBlue(DE3)感受态细胞经特殊工艺制作,pUC19质粒检测转化效率达109cfu/μg DNA。



操作方法

1. NovaBlue(DE3)感受态细胞从-80℃拿出,迅速插入冰中,5分钟后待菌块融化,加入目的DNA(质粒或连接产物)并用手拨打EP管底混匀,冰中静置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700 μl不含抗生素的无菌培养基 (LB),混匀后37℃,200 rpm复苏60分钟。

4. 5000 rpm离心一分钟收菌,留取100 μl左右上清轻轻吹打重悬菌块并涂布到含相应抗生素的LB培养基上(若质粒浓度较高,也可稀释后涂板,务必保证能在平板上挑到单克隆菌落)。

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 3ml 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. (0.6 recommended; about 2.5h).

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 2-4 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×g for 10 minutes at 4℃.

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


IPTG配制:

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. 


注意事项

1. 感受态细胞最好在冰中缓慢融化,插入冰中8分钟内加入目标DNA,不可在冰中放置时间过长,长时间存放会降低转化效率。

2. 转化高浓度的质粒可相应减少最终用于涂板的菌量。

3. 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。





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NoveBlue(DE3) Chemically Competent Cell 产品说明书
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