Method for enhancing stability of escherichia coli T7 expression system on basis of double-repression strategy
An Escherichia coli, expression system technology, applied in the field of Escherichia coli expression regulation, can solve the problems of weakened expression, low expression of target protein, and slow growth of strains
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Embodiment 1
[0056] LB medium: tryptone 10 g / L, yeast extract 5 g / L, NaCl 10 g / L, pH 7.0, prepared with double distilled water. When needed, add ampicillin (100 μg / mL) or kanamycin (50 μg / mL) before use, and add 15 g / L agar powder to the solid medium.
[0057] Pick newly converted E. coli BL21(DE3) / pET-20b(+)- pul A single colony was inoculated in 3 mL of LB liquid medium containing kanamycin (50 μg / mL), and cultured overnight at 37 °C with shaking at 200 rpm. Take 0.5 mL of the culture medium and transfer it to 50 mL of LB liquid medium containing the corresponding antibiotics, shake and culture at 37°C and 200 rpm until OD 600 About 1.2. The culture solution was transferred to 20° C. to continue culturing for 12 hours. After the cultivation, the fermentation broth was centrifuged at 10,000 rpm for 10 minutes, the cell pellet was ultrasonically broken, and the crushed solution was centrifuged at 12,000 rpm for 20 minutes, and the supernatant was taken as the intracellular component,...
Embodiment 2
[0059] LB medium: tryptone 10 g / L, yeast extract 5 g / L, NaCl 10 g / L, pH 7.0, prepared with double distilled water. When needed, add ampicillin (100 μg / mL) or kanamycin (50 μg / mL) before use, and add 15 g / L agar powder to the solid medium.
[0060] Recombinant plasmid pET-20b(+)- pul convert E. coli BL21 competent cells were inoculated in 3 mL of LB liquid medium containing corresponding antibiotics immediately after the transformants grew out, and cultured overnight at 37°C with shaking at 200 rpm. Take 0.5 mL of the culture medium and transfer it to 50 mL of LB liquid medium containing the corresponding antibiotics, shake and culture at 37°C and 200 rpm until OD 600 About 1.2. The culture solution was transferred to 20° C. to continue culturing for 12 hours. After the cultivation, the fermentation broth was centrifuged at 10,000 rpm for 10 minutes, and the supernatant was retained as the extracellular component. The cell pellet was ultrasonically disrupted, the disrup...
Embodiment 3
[0062] Autoinduction medium (g / L): β-lactose 1~50, anhydrous glucose 0.5, glycerol 5, KH 2 PO 4 6.8, MgSO 4 0.24, tryptone 10, yeast extract 5, Na 2 HPO 4 7.1, Na 2 SO 4 0.71, NH 4 Cl 2.67, trace element solution 400 μL / L, pH 7.5~8.0, prepared with double distilled water.
[0063] Trace element solution (g / L): FeCl 3 8.125, CaCl 2 2.22, MnCl 2 2.52, ZnSO 4 1.61, CoCl 2 0.26, CuCl 2 0.27, NiCl 2 0.26, Na 2 MoO 4 0.41, Na 2 SeO 3 0.346,H 3 BO 3 0.124, HCl 2.19, prepared by double distilled water.
[0064] Recombinant plasmid pET-22b(+)- pul convert E. coli BL21 competent cells were inoculated in 3 mL of LB liquid medium containing corresponding antibiotics immediately after the transformants grew out, and cultured overnight at 37°C with shaking at 200 rpm. Take 2 mL of the culture solution and inoculate it into 50 mL of the autoinduction medium containing the corresponding antibiotics, culture at 37 °C and 200 rpm for 2 hours, then transfer...
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