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AMA synthetase and application thereof in synthesis of AMA or derivatives thereof

A technology for synthesizing enzymes and derivatives, applied in the field of genetic engineering, which can solve the problems of harsh reaction conditions of chemical synthesis, inability to meet the needs of industrialization, and difficulty in obtaining natural products, etc., to achieve high atom economy and environmental friendliness, and good results Drug tolerance, easy purification effect

Active Publication Date: 2020-04-10
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even so, chemical synthesis requires harsh reaction conditions, cumbersome operation steps, and environmental unfriendliness. It is difficult to obtain a large amount of natural products in a short period of time and cannot meet the needs of industrialization.
At present, there is no other way to obtain AMA except for isolation from culture medium and chemical synthesis, which greatly limits its clinical application.

Method used

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  • AMA synthetase and application thereof in synthesis of AMA or derivatives thereof
  • AMA synthetase and application thereof in synthesis of AMA or derivatives thereof
  • AMA synthetase and application thereof in synthesis of AMA or derivatives thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0105] Cloning of embodiment 1 AMA synthetase gene

[0106] RNA extraction: The lyophilized powder of Aspergillus oryzae strain A.oryzae 3.9544 was reconstituted with sterile 0.8M NaCl, cultured in PDA medium for three days, and spores were collected with 0.8M NaCl. The spore liquid was inoculated in 100ml CD liquid medium, and the spore concentration was 2×10 8 / ml, and then cultivated at 30°C with shaking at 220rpm. Two weeks later, the Aspergillus oryzae RNA was extracted with the Plant Total RNA Extraction Kit from Tiangen Biochemical Co., Ltd.

[0107] cDNA preparation: the extracted RNA was treated with DNAase at 37°C for half an hour, then purified with an RNA purification kit, and the recovered concentration was determined by nanodrop. cDNA was obtained by reversing with Thermo Scientific RevertAid First Strand cDNASynthesisKit.

[0108] Amplification of the AMA synthetase gene sequence:

[0109] Primer sequence: Pet29a-AMA Synthetase-F: GGGAATTCCATATGGCCAATCTCAATG...

Embodiment 2

[0118] The expression purification method of embodiment 2 AMA synthetase

[0119] Transform the Escherichia coli BL21(DE3) strain with pET29a-AMA synthetase, inoculate the resulting transformants into liquid LB medium for culture, and transfer 20 mL to 1 L of LB medium containing 50 μg / ml kanamycin , 37°C, 220rpm shaking culture until the OD of the bacterial solution is 0.8-1.0, and after cooling at 16°C for 1h, add IPTG with a final concentration of 0.5mM for 18-20h induction. After the cultivation, the bacterial cells were recovered by centrifugation (5000×g, 40 minutes), and the bacterial cells were resuspended with lysis buffer (50 mM Tris, 500 mM NaCl, pH 7.4). Ultrasonic treatment was performed to crush the bacteria (500W, 30% power, ultrasonic for 5s, stop for 5s, and crush for 1h in total). Then centrifuge (15000rpm, 1h) to remove the cell residue, collect the supernatant and filter it with a 0.22μm filter membrane to obtain a crude enzyme solution. The nickel column...

Embodiment 3

[0120] Example 3 AMA synthetase catalyzes the reaction of oxyphosphoserine (OPS) / oxyacetylserine (OAS) and L-aspartic acid

[0121] The AMA synthetase obtained in Example 2 was used. AMA synthetase catalyzes the reaction process of OPS / OAS and L-aspartic acid, see image 3 .

[0122] AMA synthase activity was assayed as follows: 20 μM AMA synthase, 10 mM oxyphosphoserine / oxyacetylserine. 10 mM potassium L-aspartate, 1 mM PLP, 2 mM TCEP. Reaction at room temperature for 16h. Detection method: Take 50μl of the above reaction solution, add 50μl 100mM Fmoc-NHS, 50μl 0.2M boric acid (pH10.0), 50μl acetonitrile, react for 6h, then quench the reaction with 50μl methanol. After filtering through a 0.22 μm filter membrane, carry out UPLC-MS detection with the following liquid phase method: 0-0.3min: 5% acetonitrile, 95% water (containing 0.1% formic acid); 0.3-4min: the concentration gradient of acetonitrile increases to 50%, The concentration gradient of the aqueous phase is redu...

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Abstract

The invention provides an AMA synthetase and its application in synthesis of AMA or its derivatives, and belongs to the technical field of genetic engineering. The gene sequence of the AMA synthetaseis shown as SEQ ID No. 2, and the encoded protein sequence is shown as SEQ ID No. 1. It is found that the AMA synthetase derived from fungi can effectively make O-acetylserine or O-phosphoserine usedas a substrate react with natural amino acids to generate Toxin A or derivatives thereof and further catalyze Toxin A or derivatives thereof to generate AMA and / or any one of AMA derivatives. The AMAsynthetase provided by the invention has broad application prospects in the field of antibiotic adjuvant preparation.

Description

technical field [0001] The invention belongs to the technical field of genetic engineering, and in particular relates to an AMA synthetase derived from Aspergillus oryzae and its application in synthesizing AMA or its derivatives. Background technique [0002] AMA is a plant toxin that can be secreted by various filamentous fungi such as Aspergillus oryzae, Aspergillus flavus, and Aspergillus versicolor. As early as 1958, AMA was found to be able to combine Fe 2+ Potatoes, willows, barley, etc. suffer from wilt disease, which in turn causes plants to wither. [0003] In the 1970s, it was found that AMA is a good metal chelating agent, which can inhibit the activity of various metalloproteases including angiotensin converting enzyme, aminopeptidase and carboxypeptidase, and has a low In vivo toxicity (LD50=250mg / kg). [0004] In 2014, Wright and co-workers reported a screen for natural inhibitors of NDM-1 among a large number of DMSO-soluble natural product extracts obtain...

Claims

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Application Information

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IPC IPC(8): C12N9/00C12N15/52C12P13/00
CPCC12N9/00C12P13/00
Inventor 雷晓光郭倩倩高磊
Owner PEKING UNIV
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