Heat-resistant nitrile hydratase, engineering bacteria and application thereof in production of amide by catalyzing hydration reaction of nitrile compounds
A technology of nitrile hydratase and engineering bacteria, applied in the field of genetic engineering, can solve the problems of poor thermal stability and achieve high thermal stability
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Embodiment 1
[0042] Cloning of embodiment 1 heat-resistant nitrile hydratase 1229 gene
[0043] The genome of Auromonas manganese oxidans ATCC BAA-1229 was extracted using a bacterial genome extraction kit. Then design primers Ama_Alpha F and Ama_Act R according to the nucleotide sequence (such as SEQ ID NO.7) of putative nitrile hydratase in the genome of Auromonas manganese oxidans ATCC BAA-1229, with Auromonas manganese oxidans ATCC BAA-1229 Using the genome as a template, the full-length nitrile hydratase gene was amplified by PCR. Restriction sites BamHI and HindIII (underlined) were added to the upstream and downstream primers, respectively.
[0044]
[0045] The PCR reaction system and reaction conditions are as follows:
[0046] PCR amplification system:
[0047]
[0048] PCR amplification conditions:
[0049] 1) Pre-denaturation: 95°C for 2 minutes;
[0050] 2) Denaturation: 95°C for 10s; Annealing: 58°C for 15s; Extension: 72°C for 15s; a total of 30 cycles;
[0051] ...
Embodiment 2
[0055] Embodiment 2 Construction of recombinant heat-resistant nitrile hydratase expression plasmid and genetically engineered bacteria
[0056] In order to realize the high-efficiency functional expression of thermostable nitrile hydratase 1229 gene in Escherichia coli BL21(DE3) cells, the optimized pET28a(+) containing T7 promoter was selected as the expression vector. The vector pET28a(+) and the full-length nitrile hydratase gene were double digested with BamHI and HindIII, and the digested product was recovered using a DNA gel recovery kit.
[0057] Double enzyme digestion system and reaction conditions:
[0061] Add double distilled water to 40 μl;
[0062] Incubate at 37°C for 3h.
[0063] Nucleic acid electrophoresis was used to preliminarily determine the concentration of the two, and the gene / plasmid (mol / mol, 2:1) was mixed, and T4 DNA ligase was added to connect overnight at...
Embodiment 3
[0064] Example 3 Expression and purification of nitrile hydratase 1229 of genetically engineered E.coli BL21(DE3) / pENHase-1229
[0065] The genetically engineered bacteria E.coli BL21(DE3) / pENHase-1229 glycerol-preserved strain was inoculated in 5 mL of LB liquid medium containing 50 μg / ml Kan, and cultured at 37° C. with shaking at 200 rpm for 10 to 14 hours. Take 2 mL of the culture solution and transfer it to 100 mL of fresh LB liquid medium containing 50 μg / ml Kan, culture at 37°C with shaking at 200 rpm until the cell density (OD600) reaches 0.8, add IPTG to the final concentration of 0.1 mM, 18-37 Induce at ℃ for 12-18 hours. Cells were collected by centrifugation at 5000-10000×g for 5-10 min, washed twice with phosphate buffer (50-200 mM, pH 5.0-8.0), and resuspended in phosphate buffer. In an ice bath, use an ultrasonic breaker to break the cells, centrifuge at 5000-10000×g for 5-30 minutes, collect the supernatant of the broken cells, and pass the supernatant of the ...
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