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- 2025年07月14日
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- 详细信息
- 文献和实验
- 技术资料
- 保存条件：
负80摄氏度
- 保质期：
6month
- 英文名：
BL21 (DE3) chemically E.coli Express Competent Cells
- 库存：
货源充足
- 供应商：
LSM Bio
- 规格：
0.1ml*10
BL21(DE3) chemically Competent Cells
BL21(DE3): 10×100μl
pUC19(control vector): 10pg/μl
Store at –80°C
Genotype
F- ompT hsdSB(rB- mB- ) gal dcm(DE3)
Alternative name
BL21 (DE3) chemically Competent Cells,BL21 (DE3) Competent E.coli Express Competent Cells, BL21 (DE3) chemically E.coli Express Express Competent Cells
Transformation Protocol
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鈩?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鈩?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鈩? 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鈩?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鈩?
9. Remove the supernatant and store the cell pellet at -20鈩?(storage at lower temperatures is also acceptable).
IPTG
Prepare a 1 M solution of IPTG (Isopropyl-β-D-thiogalactoside; Isopropyl-β-D-thiogalactopyranoside) bydissolving 2.38 g of IPTG in dd water and adjust the final volume to 10 ml. Filter sterilize before use.
Caution:
1.STORAGE AND HANDLING: Competent cells should be stored at
–80°C. Storage at –20°C will result in a significant decrease in transformation efficiency. Cells lose efficiency whenever they are warmed above –80°C, even if they do not thaw.
2. This product is FOR RESEARCH USE ONLY!
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文献和实验TOP10 chemically competent cells
Overview This protocol is a variant of the Hanahan protocol [1] using CCMB80 buffer for DH10B, TOP10 and MachI strains. It builds on Example 2 of the Bloom05 patent as well. This protocol has been tested on TOP10, MachI and BL21(DE3) cells
(rk-，mk+)，phoA，supE44，λ-，thi-1，gyrA96，relA1 2：BL21(DE3) 菌株 该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。T7噬菌体RNA聚合酶位于λ 噬菌体DE3区，该区整合于BL21的染色体上。该菌适合表达非毒性蛋白。 基因型：F-，ompT， hsdS（rBB-mB－），gal， dcm（DE3
【交流】转载：JM109，DH5a，BL21这些感受态有何区别
1：DH5a菌株 DH5a是一种常用于质粒克隆的菌株。E.coli DH5a在使用pUC系列质粒载体转化时，可与载体编码的β－半乳糖苷酶氨基端实现α－互补。可用于蓝白斑筛选鉴别重组菌株。 基因型：F-，φ80dlacZΔM15，Δ(lacZYA-argF)U169，deoR，recA1，endA1，hsdR17(rk-，mk+)，phoA，supE44，λ-，thi-1，gyrA96，relA1 2：BL21(DE3) 菌株 该菌株用于高效表达克隆于含有噬菌体T7启动
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