Engineering streptomycete for producing daunorubicin and construction method of engineering streptomycete

A technology of engineering streptomyces and daunorubicin, applied in the biological field, can solve problems such as difficult industrial output levels

Active Publication Date: 2020-12-15
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these optimizations based on the original strains have greatly increased the pr

Method used

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  • Engineering streptomycete for producing daunorubicin and construction method of engineering streptomycete
  • Engineering streptomycete for producing daunorubicin and construction method of engineering streptomycete
  • Engineering streptomycete for producing daunorubicin and construction method of engineering streptomycete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Example 1: In Vitro Fishing of Daunorubicin Synthetic Gene Cluster

[0057] The invention utilizes the Red / ET DNA recombination technology to catch the daunorubicin synthetic gene cluster in vitro from the genomic DNA of Streptomyces coelicolor (CICC11043) capable of synthesizing daunorubicin, and insert it into the cluster suitable for the integration of Streptomyces. The type vector p15A-DHR was used to obtain the recombinant vector pDNR containing daunorubicin. The present invention is based on the Red / ETDNA recombination system (Wang H, Li Z, Jia R, et al. RecET direct cloning and Redαβ recombineering of biosyntheticgene clusters, large operons or single genes for heterologous expression[J].nature protocols, 2016, 11(7 ): 1175.) Design scheme, construct the schematic diagram as figure 1 shown.

[0058] The specific construction process is:

[0059] (1.1) Using the Streptomyces coelicolor genomic DNA as a template, use the primer pair DNR01-F / R to amplify the homo...

Embodiment 2

[0074] Example 2: Transformation of the promoter of the pathway-specific activator gene

[0075] The present invention uses the high-efficiency constitutive promoter kasOp* suitable for Streptomyces to replace the promoter of the daunorubicin synthesis pathway-specific activator gene dnrI on the pDNR carrier, so that the activator can be efficiently expressed in Streptomyces, Thereby activating the biosynthetic pathway of daunorubicin.

[0076] The specific modification steps are as follows:

[0077] (2.1) Using the recombinant vector pDNR as a template, use the primer pair DNR04-F / R and DNR05-F / R to amplify the upstream 195bp region and the downstream 196bp length of the dnrI promoter region (-1 to -174 bases) respectively The region of is used as the homology arm;

[0078] The sequences of the primers DNR04-F, DNR04-R, DNR05-F, and DNR05-R are shown in SEQ ID NO.14, SEQ ID NO.15, SEQ ID NO.16, and SEQ ID NO.17. :

[0079] (2.2) Use primers DNR04-F and DNR05-R to fuse the...

Embodiment 3

[0083] Example 3: Targeted knockout of branch-related genes in the synthesis of daunorubicin

[0084] The present invention uses the Red / ET DNA recombination technology to synthesize the by-product paromomycin-related methyltransferase genes dnrH and dnrX in the daunorubicin synthesis gene cluster, and to catalyze daunorubicin to reversely generate 13-dihydro The reductase gene dnrU of daunorubicin is targeted to be knocked out to improve the synthesis efficiency of daunorubicin and eliminate the interference of impurities in the subsequent preparation process.

[0085] (3.1) Use the primer pair DNR06-F / R and DNR07-F / R to amplify the region of the upstream 183bp length of the dnrH open reading frame and the downstream region of the 173bp length as homology arms;

[0086] The sequences of the primers DNR06-F, DNR06-R, DNR07-F, and DNR07-R are shown in SEQ ID NO.18, SEQ ID NO.19, SEQ ID NO.20, and SEQ ID NO.21.

[0087] (3.2) using primers DNR06-F and DNR07-R to obtain the DNA ...

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Abstract

The invention discloses engineering streptomycete for producing daunorubicin and a construction method of the engineering streptomycete. Streptomyces albus ZD11 is used as an original strain, and through in-vitro fishing of large fragments of a genome, engineering transformation of a pathway specific activation protein gene promoter, deletion of a synthetic branch and blocking of a competitive synthetic pathway, an engineering streptomycete strain ZD11-M4 capable of heterologously synthesizing the daunorubicin is constructed, and the shake-flask fermentation yield of the daunorubicin reaches 22.62 mg/g and is doubled compared with that of an original strain. According to the engineering streptomycete provided by the invention, heterologous expression of daunorubicin synthetic gene clustersis realized for the first time, and a technical foundation is laid for industrial production of the daunorubicin. Besides, an efficient expression method of a polyketone compound in a heterologous host provided by the invention has important research and application values for exploring novel polyketone antibiotics, reducing the fermentation cost and increasing the yield.

Description

technical field [0001] The invention belongs to the field of biotechnology, and in particular relates to an engineering streptomyces strain producing daunorubicin and a construction method thereof. Background technique [0002] Daunorubicin, also known as daunorubicin, is a polyketide compound catalyzed by type II polyketide synthase in Streptomyces peucetius or Streptomyces coeruleorubidus. It was developed in 1964 It was first discovered by Di Marco A et al. (Di Marco A, Gaetani M, Orezzi P, et al.'Daunomycin', a new antibiotic of the rhodomycin group[J].Nature,1964,201(4920):706-707 .). Follow-up in-depth studies have shown that daunorubicin has good antitumor activity ( K.Active outward transport of daunomycin in resistant Ehrlichascites tumor cells[J].Biochimica et Biophysica Acta(BBA)-Biomembranes,1973,323(3):466-483.), and was approved by FDA in 1979 as a clinical treatment Chemotherapy drugs for tumors can be used to treat acute myelogenous leukemia, chronic myel...

Claims

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Application Information

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IPC IPC(8): C12N1/21C12N15/76C12N15/90C12N15/52C12R1/47
CPCC12N15/52C12N15/76C12N15/902
Inventor 管文军李涵董建新
Owner ZHEJIANG UNIV
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