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ER2566 Chemically Competent Cell 產品說明書 

產品規(guī)格

ER2566:                                            10×100μl

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

保存條件：-80℃ 

基因型

F- λ- fhuA2 [lon] ompT lacZ::T7 gene1 gal sulA11 Δ(mcrC-mrr)114::IS10 R(mcr-73::miniTn10-TetS)2 R(zgb-210::Tn10)(TetS) endA1 [dcm]

產品說明

ER2566菌株是NEB公司開發(fā)的具有超高轉化效率的蛋白表達原核菌株，來源于BL21。Lac啟動子啟動下游T7RNA聚合酶的表達，可用于T7啟動子表達載體(如pET系列)的高水平蛋白表達。fhuA2賦予ER2566菌株對噬菌體T1的抗性。同時ER2566為lon 和 ompT蛋白酶缺陷菌株。Lon蛋白酶和膜外蛋白酶OMPT的缺失能夠有效抑制表達的異源蛋白在大腸桿菌體內的降解，Δ(mcrC-mrr)114，mcr-73突變的存在使ER2566菌株無法對外源DNA進行標記、限制，提高了外源甲基化DNA的轉化效率。ER2566感受態(tài)細胞由特殊工藝制作，pUC19質粒檢測轉化效率達10⁹ cfu/μg DNA。

操作方法

1.ER2566感受態(tài)細胞從-80℃拿出，迅速插入冰中，5分鐘后待菌塊融化，加入目的DNA（質?；蜻B接產物）并用手撥打EP管底輕輕混勻(避免用槍吸打)，冰中靜置25分鐘。

2. 42℃水浴熱激45秒，迅速放回冰上并靜置2分鐘，晃動會降低轉化效率。

3. 向離心管中加入700μl不含抗生素的無菌培養(yǎng)基(2YT或LB)，混勻后37℃，200rpm復蘇60分鐘。

4. 5000rpm離心一分鐘收菌，留取100μl左右上清輕輕吹打重懸菌塊并涂布到含相應抗生素的2YT或LB培養(yǎng)基上。

5. 將平板倒置放于37℃培養(yǎng)箱過夜培養(yǎng)。

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×g for 10 min 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.  

注意事項

1. 感受態(tài)細胞最好在冰中緩慢融化，插入冰中8分鐘內加入目標DNA，不可在冰中放置時間過長，長時間存放會降低轉化效率。

2. 混入質粒時應輕柔操作。

3. 轉化高濃度的質?？上鄳獪p少最終用于涂板的菌量。

4. 誘導時，IPTG濃度可選（0.1-2mM均可）。

5. 為獲得需要量的蛋白，最佳誘導時間，溫度，IPTG濃度需實驗者優(yōu)化。