Method for constructing self-assembled expression double-enzyme strain and application
A technology of self-assembly and bacterial strains, which is applied in the fields of genetic engineering and enzyme engineering, and can solve problems such as lower conversion rates
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Embodiment 1
[0064] A method for constructing a self-assembled expression dual enzyme strain, comprising the steps of:
[0065] (1) Acquisition of the target gene
[0066] Using the genome of Sulfolobus acidocaldarius ATCC 33909 as a template, primers were designed with seamless cloning software, and PCR amplification was performed to obtain MTSase encoding gene treY and MTHase encoding gene treZ, the sequence of the gene treY is SEQ ID NO. 1. The sequence of the gene treZ is SEQ ID NO.2; the artificially synthesized SpyCatcher gene sequence is used as a template, primers are designed with seamless cloning software, and the SpyCatcher gene is obtained by PCR amplification, and the SpyCatcher gene sequence is SEQ ID NO. 3. The SpyTag gene sequence is directly synthesized in the primer, and the SpyTag gene is obtained by PCR amplification, and the SpyTag gene sequence is SEQ ID NO.4.
[0067] The amplification primer sequence of the treY gene is as follows:
[0068] treY-F: GCGATGCGCATAT...
Embodiment 2
[0128] Three target expression strains prepared in Example 1 and one target expression strain involved in Comparative Example 1 were used to prepare fermentation broth.
[0129] The target expression strain was inoculated in LB liquid medium supplemented with kanamycin resistance (final concentration of kanamycin: 80 μg / mL), and cultured at 37° C. and 200 rpm for 12 hours as a seed solution. The seed solution was inoculated into TB liquid medium with kanamycin resistance (final concentration of kanamycin: 80 μg / mL) at a volume ratio of 1:100, cultured at 37 °C and 200 rpm for 8 h, and lactose was added as Inducer (the final concentration of lactose is 6 mg / L), the temperature was adjusted to 25° C. and the fermentation was continued for 12 hours to obtain the fermentation broth of the target expression strain.
Embodiment 3
[0131] The double-enzyme complex enzyme is used for substrate conversion. Using the fermented liquid of 4 kinds of purpose expression bacterial strains prepared in Example 2, each 100 mL of the fermented liquid is centrifuged at high speed to obtain the bacterial cell precipitation, and the bacterial cell is weighed with 10 mL of 10 mM PBS buffer solution of pH5.5. Suspension, using an ultrasonic breaker to break the cells, the breaking conditions are: power 300w, breaking time 3s, intermittent time 5s, time 15min, to obtain crude enzyme solution, 65 ° C, pH 5.5 conditions of conversion concentration of 15% maltodextrin , and add 5% cyclodextrin glucosyltransferase (CGTase), transform for 12h to complete transformation, after the transformation is completed, boil at 100°C for 10min to inactivate and terminate the reaction, and detect the content of trehalose in the sample by HPLC.
[0132]
[0133] The strain E.coli BL21(DE3) / pET28a-SpyCatcher-treY-SpyCatcher / pETDuet-SpyTag-...
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