Recombinant bacterium capable of high efficiently secreting and expressing natto kinase
A nattokinase, secretory expression technology, applied in the field of recombinant bacteria, can solve the problem that the nattokinase expression level cannot meet the industrialization and other problems
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Embodiment 1
[0048] Embodiment 1, the construction of the recombinant expression vector containing nattokinase Pro-NK gene
[0049] (1) Extraction of chromosomal DNA from Bacillus subtilis subsp natto
[0050] Inoculate the spore suspension or slant mycelium of Bacillus subtilis natto (preservation number CGMCC1.1086, purchased from China General Microorganism Culture Collection Management Center) stored at -70°C into 5mL LB medium, shake at 37°C Incubate for 48 hours. Take 3 mL of the bacterial liquid and centrifuge to collect the mycelium, and wash the mycelium twice with 500 μL of STE buffer. Then use 500 μL of STE to fully suspend the mycelium, add lysozyme to a final concentration of 2 mg / mL, at this time, the bacterial suspension becomes translucent gel, and then add 250 μL of 2% SDS (Sodium dodecyl sulfate, 16 Sodium Alkyl Sulfate), vortexed to mix. Then add 250 μL of neutral phenol / chloroform mixed solution and mix well, wherein the volume ratio of phenol and chloroform is 25:24...
Embodiment 2
[0068] Embodiment 2, the preparation of the yeast strain expressing nattokinase and its functional detection
[0069] 1. Preparation of Strains Expressing Nattokinase
[0070] (1) Preparation of electrotransformed Pichia pastoris cells
[0071] Inoculate Pichia pastoris strain GS115 (purchased from Invitrogen, CA.18100) in 500mL YPD medium, cultivate to OD at 30°C and 200r / min 600 =1.3-1.5. Centrifuge at 4°C and 4500r / min for 5 minutes to collect the bacterial cells, and wash once with 500 mL, 250 mL of pre-cooled sterilized water and 20 mL of pre-cooled 1mol / L sorbitol, respectively. After each wash, the cells were collected by centrifugation at 4°C and 4500 r / min for 5 minutes, and finally suspended with 1 mL of pre-cooled 1 mol / L sorbitol to obtain electroshock competent cells.
[0072] (2) Preparation of recombinant Pichia pastoris strain containing recombinant expression vector pAOα-PNK
[0073] Take about 10 μg of the recombinant expression vector pAOα-PNK obtained i...
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