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A fungus-derived acid protease g412 and its gene and application

An acid protease, ppic9-g412 technology, applied in the field of genetic engineering, can solve the problems of reduced catalytic efficiency, low enzymatic activity, industrial application limitations, etc., and achieves the effects of high reaction temperature and easy fermentation production.

Active Publication Date: 2020-03-27
INST OF ANIMAL SCI OF CHINESE ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the properties of most acid proteases are not satisfactory, and the enzyme activity is not very high, which brings great waste to industrial production and food processing, and also limits its application range to a certain extent.
Due to the difference between the optimal action conditions of the enzyme itself and the catalyzed environmental conditions (such as pH, temperature, etc.), the catalytic efficiency of the enzyme is reduced, and its industrial application is limited.
Most of the acid proteases used in industrial production are fungal acid proteases. The optimum pH value of such enzymes is about 3.0. When the pH value increases, the enzyme activity of acid proteases will decrease significantly, and these enzymes are not heat-resistant. It is very unstable when the temperature reaches above 50°C, which limits the application of acid protease

Method used

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  • A fungus-derived acid protease g412 and its gene and application
  • A fungus-derived acid protease g412 and its gene and application
  • A fungus-derived acid protease g412 and its gene and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Cloning of embodiment 1 protease coding gene g412

[0048] Genomic DNA of Talaromyces leycettanus JCM 12802 was extracted and stored at -20°C for later use.

[0049] Cloning primers g412F and g412R were designed, and the genomic DNA of Talaromyces leycettanus JCM 12802 was used as a template for PCR amplification. The PCR reaction parameters are: the PCR reaction parameters are: 95°C for 5min; 94°C for 30sec, 60°C for 30sec, 72°C for 2min, 35 cycles, and 72°C for 10min. A fragment of about 1800bp was obtained, which was recovered and sent to Ruibo Biotechnology Co., Ltd. for sequencing.

[0050] Table 1 Primers required for this experiment

[0051]

[0052] Extraction of total RNA from Talaromyces leycettanus JCM 12802, using Oligo(dT) 20and reverse transcriptase to obtain a strand of cDNA, then design the primers g412F and g412R (see Table 1) for amplifying the open reading frame, amplify the single-stranded cDNA, obtain the cDNA sequence of the protease, and sen...

Embodiment 2

[0054] The construction of embodiment 2 protease engineering strains

[0055] (1) Construction of expression vector and expression in yeast

[0056] Using the correctly sequenced cDNA of protease g412 as a template, primers F and R with SnaB I and Not I restriction sites were designed and synthesized (see Table 1) to amplify the coding region of the mature protein of g412. And use SnaB I and NotI to digest the PCR product, connect it into the expression vector pPIC9 (Invitrogen, San Diego), the sequence of the protease g412 mature protein is inserted into the downstream of the signal peptide sequence of the above expression vector, and form a correct reading frame with the signal peptide, The yeast expression vector pPIC9-g412 was constructed and transformed into Escherichia coli competent cell Trans1. The positive transformants were subjected to DNA sequencing, and the transformants with the correct sequence were used for large-scale preparation of recombinant plasmids. Lin...

Embodiment 3

[0060] The preparation of embodiment 3 recombinant proteases

[0061] (1) Massive expression of protease gene g412 at shake flask level in Pichia pastoris

[0062] The transformant with high enzyme activity was screened out, inoculated into a 1L Erlenmeyer flask with 300mL of BMGY liquid medium, cultured on a shaking table at 30°C at 220rpm for 48h; centrifuged at 5,000rpm for 5min, discarded the supernatant gently, and then added 100mL containing 0.5% methanol BMMY liquid medium, 30°C, 220rpm induction culture for 72h. During the induction culture period, add methanol solution once every 24 hours to compensate for the loss of methanol, and keep the methanol concentration at about 0.5%; (3) Centrifuge at 12,000×g for 10 minutes, collect the supernatant fermentation liquid, detect the enzyme activity and perform SDS-PAGE protein Electrophoretic analysis.

[0063] (2) Purification of recombinant protease

[0064] The recombinant protease supernatant expressed in the shake fla...

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Abstract

The invention relates to the field of genetic engineering. In particular, the invention relates to a fungus-derived acid protease g412 as well as a gene and application thereof, and the amino acid sequence of the fungus-derived acid protease g412 is shown as SEQ ID NO.1 or SEQ ID NO.2. The acid protease disclosed by the invention has good properties, and can be applied to industries such as food, feed and pharmacy. According to the technical solution of the invention, a genetic engineering means can be utilized to produce the protease with excellent properties which is suitable for industrial application.

Description

technical field [0001] The invention relates to the field of genetic engineering. Specifically, the present invention relates to an acid protease g412 derived from fungi, its gene and application. Background technique [0002] Protease is a kind of enzyme that catalyzes the hydrolysis of protein, and is widely used in industries such as food, washing, and tanning. Microbial proteases have become an important source of current proteases. There are many ways to classify proteases, which are divided into acidic proteases, alkaline proteases and neutral proteases according to the pH of their action; proteases can be divided into four categories according to the active center: serine protease, aspartic acid protease, cysteine ​​protease proteases and metalloproteases. Aspartic proteases are a class of proteolytic enzymes active at acidic pH. [0003] Proteases are widely used in industries such as food, brewing, fur and leather, medicine and feed. The addition of acid protea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12N9/58C12N15/57C12N15/81C12N1/19C12R1/84
CPCC12N9/58C12N15/815
Inventor 姚斌罗会颖郭玉杰涂涛王苑黄火清柏映国苏小运王亚茹孟昆
Owner INST OF ANIMAL SCI OF CHINESE ACAD OF AGRI SCI
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