Alkaline protease gene, alkaline protease as well as preparation method and application of alkaline protease
A protease and alkaline technology, applied in the field of genetic engineering, can solve the problem of high production cost of alkaline protease, achieve good stability and codon adaptability, improve codon adaptability, and reduce production costs
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[0044] Correspondingly, the embodiment of the present invention also provides a kind of preparation method of alkaline protease AprBp, it comprises the steps:
[0045] S1. Provide alkaline protease gene aprbp, expression vector and expression strain;
[0046] S2. Amplify the alkaline protease gene aprbp, and connect the obtained amplified product to an expression vector to obtain a recombinant expression vector;
[0047] S3. Transforming the recombinant expression vector into an expression strain to obtain a recombinant expression strain;
[0048] S4. Cultivate the recombinant expression strain to obtain alkaline protease AprBp;
[0049] Wherein, the nucleotide sequence of the alkaline protease gene aprbp is shown in SEQ ID NO:1.
[0050] In the preparation method of alkaline protease AprBp provided by the embodiment of the present invention, the corresponding recombinant expression vector and recombinant expression strain are obtained by amplifying the alkaline protease gen...
Embodiment 1
[0073] This embodiment provides alkaline protease gene sequence analysis and codon optimization process, and the construction of corresponding expression vector, including the following steps:
[0074] Bacillus patagoniensis peptidase was entered in the NCBI protein database, and through comparative analysis, it was found that the protease with the accession number WP_078392427.1 was similar to the alkaline protease from Bacillus alkalophilus, Bacillus subtilis and Bacillus circulans (current industry The most widely used alkaline protease) has the highest similarity. Analysis from the angle of amino acid similarity shows that this protease is the most suitable for industrial application in the searched protein sequence, so this protease is used as the research object for experiments.
[0075] In the present invention, the protease is intended to be recombinantly expressed in Bacillus subtilis. Since the gene codes of Bacillus subtilis and Bacillus patagoniensis have certain d...
Embodiment 2
[0081] This embodiment provides a construction process of a recombinant Bacillus subtilis strain containing the recombinant expression vector obtained in Example 1, specifically as follows:
[0082] The first step in the construction process of recombinant Bacillus subtilis is to prepare competent cells. The preparation process of Bacillus subtilis WB800N competent cells is roughly as follows:
[0083] (4) Pick a single colony (2-3mm in diameter) from a plate cultured at 37°C for 16-20 hours, transfer it to a 50mL centrifuge tube containing 5ml LB medium, and shake vigorously at 37°C overnight;
[0084] (5) Inoculate 1% of the inoculum into 50ml GM (LB+0.5M sorbitol), measure the OD in the shaker tube, and control the inoculum so that the OD of the medium after inoculation is between 0.19-0.2. Cultivate at 37°C, 200rpm until OD600=0.8-1.0 (about 3-4 hours);
[0085] (6) Take all the bacterial liquid in an ice-water bath for 10 minutes, then centrifuge at 5000 rpm for 8 minute...
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