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Fungus-derived beta propeller-type recombinant phytase r-AoPhytase and expression strain and application thereof

A propeller-type, phytase technology, applied in the fields of molecular biology and genetic engineering, can solve the problems of low specific enzyme activity and unsuitable feed processing technology, and achieve the effect of promoting release

Active Publication Date: 2020-01-03
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the BPP type phytase derived from bacteria has low specific enzyme activity, and the optimum pH and optimum temperature are not suitable for the application of feed processing technology

Method used

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  • Fungus-derived beta propeller-type recombinant phytase r-AoPhytase and expression strain and application thereof
  • Fungus-derived beta propeller-type recombinant phytase r-AoPhytase and expression strain and application thereof
  • Fungus-derived beta propeller-type recombinant phytase r-AoPhytase and expression strain and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Example 1: AoPhytase codon optimization and its recombinant expression in Pichia pastoris

[0061] According to the AoPhytase amino acid sequence SEQ ID NO.1 and the nucleotide sequence SEQ ID NO.2 (GenbankaccessionNO.22896793), codon optimization was carried out for the Pichia pastoris expression system to obtain the AoPhytase gene sequence (SEQ ID in the sequence listing NO.3). Then use EcoRI and SalI to double digest the optimized gene fragment, connect it with the same double restriction vector pPICZαA at 16°C overnight, and transform the ligation product into competent DH5α cells, and put it on the LB solid medium plate containing Zeocin resistance Positive transformants were screened. Such as figure 1 As indicated, the expression vector pPICZαA-Aophytase was obtained.

[0062] Take 20 μg of plasmid pPICZαA-Aophytase, add 2 μl of restriction enzyme Fast DigestSac Ⅰ enzyme and 50 μl of 10×FastDigest Buffer, add ddH2O to 500 μl, and react overnight at 37°C to make...

Embodiment 2

[0066] Embodiment 2: the purification of recombinant AoPhytase

[0067] 1. Preparation of crude enzyme solution: Inoculate recombinant engineered Pichia pastoris into 50 mL of BMGY medium at a ratio of 1:1000, culture at 220 rpm at 30°C for about 48 hours, and measure OD600 = 4.6. Then the culture was centrifuged at 1500 rpm for 10 min, the supernatant was discarded, and the pellet was resuspended in 200 mL of BMMY medium, and the OD600 was measured to be 1.1, and induced at 220 rpm for 72 h at 30°C. The above culture solution was centrifuged at 4°C, 8000rpm for 10min, and the supernatant was the crude enzyme solution.

[0068] 2. Separation and purification of phytase: add 5mL Ni NTA Beads 6FF to the supernatant, and incubate at 4°C for 2h. Add the incubation product to the empty column tube and collect the effluent. The filler was washed with 20 mM imidazole buffer solution (10 mM Na2HPO4, 2 mM KH2PO4, 0.8% NaCl, 0.02% KCl, 5% Glycerol, 20 mM Imidazole, pH 6.0), and the wa...

Embodiment 3

[0069] Embodiment 3: Analysis of recombinant AoPhytase enzyme activity

[0070] 1. Drawing of phosphorus standard curve: measure 0, 2, 4, 6, 8 and 10ml of phosphorus standard stock solution in a 100ml volumetric flask, dilute to the mark, and make phosphorus content of 0, 0.1, 0.2, 0.3 , 0.4 and 0.5mmol / L standard curve determination liquid. Take six 15ml centrifuge tubes, add 1ml of the standard measurement solution of the above concentration, and then add 1ml of AMES chromogenic solution. After 20 minutes in a water bath at 50°C, cool to room temperature, measure the OD value at 700nm, and draw the OD-phosphorus concentration standard curves, such as Figure 4 shown.

[0071] 2. Determination of enzyme activity: After diluting the pure enzyme solution with a concentration of 0.088 mg / ml 10 times, take 100 μl of diluted enzyme solution and 900 μl of substrate solution (2mM sodium phytate dissolved in 100mM Tris-HCl buffer, pH 7.0) and mix , add 1ml of 10% trichloroacetic a...

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Abstract

The invention discloses a fungus-derived beta propeller-type recombinant phytase r-AoPhytase and an expression strain and application thereof. The original source of the beta propeller-type recombinant phytase r-AoPhytase is Arthrobotry oligosopra, and the amino acid sequence of the r-AoPhytase is one of the following amino acid sequences: (1) SEQ ID No: 1 in a sequence table; (2) an amino acid sequence which is obtained by substituting, deleting or adding one or more amino acid residues to the SEQ ID No: 1 in the sequence table and encodes proteins with the same function; and (3) a mutant amino acid sequence which has more than 80% of homology with the SEQ ID No: 1 in the sequence table. The recombinant phytase r-AoPhytase provided by the invention has relatively high specific enzyme activity, approximately neutral optimal pH value and relatively high optimal temperature, has the capacity of promoting release of inorganic phosphorus and soluble minerals in different feed samples, andis suitable for feed processing and production.

Description

technical field [0001] The invention belongs to the fields of molecular biology and genetic engineering, and in particular relates to a fungal source beta propeller type recombinant phytase r-AoPhytase and its expression strain and application. Background technique [0002] Phytase preparations are widely used in animal and human nutrition. It hydrolyzes phytate (inositol-1, 2, 3, 4, 5, 6-hexaphosphate) to produce lower inositol phosphate derivatives and inorganic phosphates (Mullaney, Daly, & Ullah, 2000). Phytate is considered the major storage form of phosphate and inositol in plants, and phytic acid derivatives account for 60-80% of phosphorus in plant-sourced feeds. At the same time, phytic acid is also a polyanion chelating agent, which can interact with several major nutritionally valuable divalent cations, such as Ca 2+ , Mg 2+ , Zn 2+ , Cu 2+ , Fe 2+ and Mn 2+ Complexes are formed (Chen & Headquarters, 2000). Phytase is widely used in commercial poultry, pig...

Claims

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Application Information

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IPC IPC(8): C12N9/16C12N15/55C12N15/66C12N15/81C12N1/19A23K20/189C12R1/84
CPCC12N9/16C12Y301/02006C12N15/66C12N15/815C12Y301/03008A23K20/189
Inventor 王永中侯贤娟沈振孔小卫盛康亮汪静敏
Owner ANHUI UNIVERSITY
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