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Construction and application of multiple gene coexpression system containing angolosamine glycosylsynthetase and glycosyltransferase

A technology of glycosyltransferase and glycosylaminoglycosyl, applied in the field of multi-gene co-expression system, can solve the problems of complex chemical synthesis of deoxyglycosylation and low yield

Inactive Publication Date: 2009-12-30
HUAZHONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Because the in vitro chemical synthesis of deoxysugar groups contained in the natural structure of antibiotics is often complicated and the yield is very low
The source of these deoxyglycosyl groups largely limits the modification of antibiotics in vitro, so there are not many examples of glycosylation studies on antibiotics using in vitro glycosylation experiments.
[0004] Angolosamine (angolosamine) is a rare deoxyhexosamine, which is only found in the secondary metabolite structure of a limited number of Streptomyces, and is not commercialized at present. Its chemical synthesis requires more than ten steps and the yield is very low. [Fraser-reid B, Kelly DR, Tulshian DB. And Prasad SR, Routes From "Triacetyl Glucal" to 6-Deoxy-Hex-2-Enopyranosides, J Carbohydrate Chemistry, 1983, 2(2): 105-114], this This limits the use of this glycosyl group in the study of Angora glycosylation of antibiotics in vitro

Method used

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  • Construction and application of multiple gene coexpression system containing angolosamine glycosylsynthetase and glycosyltransferase
  • Construction and application of multiple gene coexpression system containing angolosamine glycosylsynthetase and glycosyltransferase
  • Construction and application of multiple gene coexpression system containing angolosamine glycosylsynthetase and glycosyltransferase

Examples

Experimental program
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Embodiment 1

[0046] Identify several (5-8) transformants CH999 / pAYT55 containing pAYT55, culture them on a solid medium at 30°C for 5 days until sporulation, collect the spores, and store them in glycerol tubes (spore titer greater than 10 61 / μL), get 10 microliters of spore suspension and inoculate 2mL seed culture medium (the formula of the culture medium sees the content of the invention), place it in a constant temperature shaker at 30°C, 200 rpm, and cultivate it for 2 days, then press 1:50 Ratio, get the seed culture and transfer it into the production medium ((see the content of the invention for the formula of the medium), and inoculate the seed culture of the bacterial strain B135 that produces polyketides in equal amounts at the same time, 30 ° C, 200 rpm, shaker Cultivate for 5 days. Transfer the fermented liquid into a centrifuge tube, centrifuge at 5000 rpm at room temperature for 10 minutes, collect the supernatant, and directly carry out LC / MS detection. The detection conditi...

Embodiment 2

[0049] Identify several (5-8) transformants B135 / pAYT55 containing pAYT55, culture them on solid medium for 5 days until spore production, collect spores, and store them in glycerol tubes (spore titer greater than 10 6 individual / μL), get 500 microliters of spore suspension and inoculate 20mL seed culture medium (the formula of culture medium sees the content of the invention), place it in a constant temperature shaker at 30°C, 200 rpm, and cultivate it for 2 days, then press 1:25 Ratio, take the seed culture and transfer it into the production medium (see the content of the invention for the medium formula), transfer the fermentation broth into a centrifuge tube, centrifuge at 5000 rpm at room temperature for 10 minutes, and collect the supernatant. Adjust the pH of the supernatant to neutral with 1N HCl or 1N NaOH, extract three times with ethyl acetate, mix the extracts, add water to extract once (wash), filter with anhydrous sodium sulfate powder to remove water, filter wit...

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Abstract

The invention provides construction and application of a multiple gene co-expression system containing angolosamine glycosylsynthetase and glycosyltransferase. The invention is characterized by taking a streptomyces genome bank plasmid as a template; amplifying six angolosamine synthetase genes and a glycosyltransferase gene through PCR and connecting the genes in sequence and placing the genes in the lower reaches of a streptomyces promoter PactIII-actI to form a transcription unit; transferring the transcription unit to a streptomyces plasmid carrier pSET152, thus constructing a streptomyces expression plasmid pAYT55 co-expressed by multiple genes; leading the pAYT55 into a host cell streptomyces coelicolor CH999, mixedly culturing obtained engineering bacteria and streptomyces B135 of accumulated polyketide kalafungin, thus realizing bioconversion of kalafungin into a novel antibiotic with angolosamine; or directly leading pAYT55 into the streptomyces B135 and carrying out single culture to realize glycosylation of kalafungin. Therefore, by adopting the system, rare angolosamine can be synthesized in the cell and angolosamine modification can be carried out on polyketide by adopting the low substrate recognition specificity of antibiotic glycosyltransferases.

Description

Technical field: [0001] The present invention relates to a multi-gene co-expression system related to antibiotic rare glycosyl synthesis and transfer and antibiotic structural modification (glycosylation), especially a co-expression plasmid containing angolan glycosamine synthetase and glycosyltransferase genes Application of constructing and expressing engineering bacteria. Background technique: [0002] Many natural active substances, such as antibiotics, contain sugar groups in their structures. These sugar groups are connected to specific positions on the mother nucleus of the antibiotic molecule, and are crucial to the biological activity of the compound, and are even essential functional groups. The differences in the sugar structure, the number of sugar groups, and the connection position and connection method on the sugar receptors will have a great impact on the biological activity of antibiotics. The glycosyl structures of antibiotics are diverse, and the correspo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12N15/76C12P17/18C12P39/00C12R1/465C12R1/59C12R1/58C12R1/045C12R1/01
Inventor 李爱英王慧利蔡晓凤
Owner HUAZHONG NORMAL UNIV
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