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Beta-mannase heat-resistant mutant M22, recombinant bacterium and application of beta-mannase heat-resistant mutant M22 and recombinant bacterium

A technology of mannanase and mutants, which is applied in the field of genetic engineering and enzyme engineering, can solve the problems that the heat resistance does not meet the industrial requirements, the biological activity is unstable, etc., and achieve the effect of optimizing the charge distribution and improving the heat resistance

Inactive Publication Date: 2021-08-06
OCEAN UNIV OF CHINA
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

At present, the heat resistance of β-mannanase on the market often does not meet the industrial requirements, resulting in unstable biological activity during production and transportation, which seriously limits the application of this enzyme

Method used

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  • Beta-mannase heat-resistant mutant M22, recombinant bacterium and application of beta-mannase heat-resistant mutant M22 and recombinant bacterium

Examples

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Effect test

Embodiment 2

[0055] 6. Example 2: Construction of β-mannanase site-directed mutant recombinant vector

[0056] Using the recombinant vector pPICZαA-ManAK containing the ManAK gene as a template, add primers for the mutation site, and perform PCR amplification with high-fidelity enzymes. The product is digested with DpnⅠ and transformed into DH5α E. Positive clones were screened on the LB plate, and the sequencing work was completed by Qingdao Ruibo Xingke Co., Ltd.

Embodiment 3

[0057] 7. Example 3: Construction of β-mannanase site-directed mutant expression vector

[0058] The positive clones with correct sequencing after mutation in Example 2 were extracted and purified, and the corresponding plasmids were linearized with Sac I single enzyme digestion, electrotransformed into Pichia pastoris X33, and screened on MD plates to obtain the transformants of each mutant expression strain. Transfer to YPD plate for activation.

Embodiment 4

[0059] 8. Example 4: Verification of high-throughput expression of β-mannanase mutants in Pichia pastoris

[0060] Pick the activated transformant in Example 3 and inoculate it into 1mL of BMGY medium, culture it in a 48-well plate at 30°C and 200rmp on a shaker, add 1% methanol of the culture volume for the first time after 24h to induce the expression of the enzyme, and then the culture process Induced once every 24h. After inducing expression for 96 hours, the culture medium was centrifuged to obtain the supernatant, and the activity and thermal stability of β-mannanase in the fermentation medium supernatant were determined.

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Abstract

The invention relates to a beta-mannase heat-resistant mutant M22, a recombinant bacterium and application of the beta-mannase heat-resistant mutant M22 and the recombinant bacterium, and belongs to the field of gene engineering and enzyme engineering. The beta-mannase heat-resistant mutant M22 is obtained by adopting a protein surface charge optimization strategy, rationally designing and screening a mutation site, improving beta-mannase ManAK from aspergillus candidus, then selecting forward mutation through a high-throughput screening method, and finally, obtaining 23 beta-mannase mutants with improved thermal stability. The heat resistance of the obtained beta-mannase mutant is 1.2-3.5 times that of an original gene, the heat resistance is remarkably improved, commercial application of the beta-mannase mutant is facilitated, and therefore the production cost is reduced.

Description

technical field [0001] The invention belongs to the fields of genetic engineering and enzyme engineering, and specifically relates to a kind of beta-mannanase heat-resistant mutants, recombinant bacteria and applications thereof. Background technique [0002] Mannan is the second largest component of hemicellulose, composed of mannopyranose linked by β-1,4 glycosidic bonds. The complete degradation of mannan requires the synergistic action of mannanase, mannosidase, glucosidase, galactosidase and deacetylase. Among them, mannanase is the key enzyme in the degradation process. [0003] β-mannanase (EC 3.2.1.78) is capable of hydrolyzing mannan into mannose and mannooligosaccharides by catalyzing β-1,4 mannosidic linkages. As an important industrial enzyme preparation, the enzyme is widely used in renewable energy fields such as animal feed, food processing, medicine, textile, biological bleaching and petroleum. Some of these application fields, especially feed pelleting, r...

Claims

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Application Information

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IPC IPC(8): C12N9/24C12N15/81C12N1/19C12R1/84
CPCC12N9/2494C12N15/815C12Y302/01078
Inventor 牟海津刘哲民宁晨张芳
Owner OCEAN UNIV OF CHINA
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