76 results about "Streptomyces coelicolor" patented technology

The invention relates to a microbial agent capable of reducing leaf vegetable plant diseases and insect pests and a preparing method thereof, belonging to the technical field of agricultural production application of microorganisms. The microbial agent capable of reducing leaf vegetable plant diseases and insect pests is characterized in that the microbial agent is prepared from the following rawmaterials: beauveria bassiana culture solution, streptomyces coelicolor culture solution, compound strain culture solution, garlic, molasses, Chinese medicinal herb and trace element inorganic salt solution, wherein the compound strain is composed of Bacillus subtilis culture solution, rhodopseudomonas palustris and saccharomycetes. The preparing method is as follows: respectively culturing beauveria bassiana and streptomyces coelicolor alone, culturing Bacillus subtilis, lactobacillus and saccharomycetes in a compound mode; mixing and fermenting three culturing products, Chinese medicinal herb, garlic and the like; and finally, adding trace elements into the compound fermentation product. The invention can obviously strengthen leaf vegetable organism disease resistance and resilience, improves soil and reduces soil-borne diseases.

The invention provides a microbe microbial inoculum and a preparation method thereof as well as a method for producing biological humic acid with sugarcane sugaring residue by the microbe microbial inoculum. The microbe microbial inoculum prepared by the invention comprises a culture medium and thallus, wherein the thallus comprises Bacillus subtilis, Bacillus amyloliquefaciens, Bacillus licheniformis, Streptomyces coelicolor and Aspergillus fumigatus, and each gram of compounded microbe microbial inoculum contains 0.5-1.5*109 total viable bacteria. The microbe microbial inoculum of the invention can quickly ferment sugarcane sugaring residues so as to obtain biological humic acid. Compared with mineral humic acid, the biological humic acid has the advantages of small molecular weight, large amount of active group, favourable water solubility, high bioactivity and the like and is easy to adsorb by the tissues of plants and animals, so that the biological humic acid can serve as the repairing preparation and fertilizer of water body and soil. Thus, the sugarcane sugaring residue can be effectively processed and utilized so as to really change waste material into things of value.

The invention relates to a streptomyces coelicolor trehalose synthase enzyme gene. The gene is cloned from streptomyces coelicolor (Streptomyces coelicolor, AS 4.1061). A trehalose synthase enzyme expressed by the gene can be used for converting maltose into trehalose under the normal biochemical reaction conditions and has the characteristics of high reaction speed, high conversion rate of a substrate and few byproducts. The content of trehalose in a product generated in the process of converting the maltose at a temperature of 25 DEG C can achieve over 75 percent and only little glucose is generated. The streptomyces coelicolor trehalose synthase enzyme gene is beneficial for improving the conversion rate of the substrate and reducing the production cost. The gene can be applied to production of the trehalose. The trehalose can be applied to the fields of food industry, beauty cosmetics, medical biological products and the like.

The invention relates to a phospholipase A2 mutant and a preparation method thereof. The technical scheme is as follows: the preparation method comprises the following steps: carrying out site-specific mutagenesis on the amino acid residues of Glu37 and Asp78 of wild type phospholipase A2 derived from streptomyces coelicolor by utilizing a recombinant DNA technology to obtain a phospholipase A2 gene with higher activity; then expressing the phospholipase A2 gene with higher activity in a bacillus subtilis expression system and a pichia pastoris expression system (which comprises a pichia pastoris free expression system and a pichia pastoris cell surface display system) to obtain a recombinant strain capable of generating high-activity phospholipase A2; after the phospholipase A2 gene with higher activity is expressed, detecting that the enzyme activity of the high-activity phospholipase A2 is enhanced by 13.7% compared with that of the wild type phospholipase A2, wherein the enzyme activity of the phospholipase A2 can be up to 53.5 U/ml after the bacillus subtilis high-activity phospholipase A2 recombinant bacteria is fermented, the enzyme activity of pichia pastoris free-expression high-activity phospholipase A2 recombinant bacteria can be up to 106.4 U/ml, and the enzyme activity of a pichia pastoris cell surface display high-activity phospholipase A2 whole-cell catalyst can be up to 260 U/(g.stem cell).

The invention discloses a streptomycete constitutive promoter and applications thereof, and provides an DNA fragment. The DNA fragment is any one selected from the following DNA molecules in 1)-3): 1) an DNA molecule represented by the sequence 1 in a sequence table; 2) an DNA molecule with promoter functions and hybrid with the DNA molecule shown in 1) under strict conditions; 3) an DNA molecule with more than 90% of homology with the DNA molecule shown in 1) and with promoter functions. The experiments shows that a strong constitutive promoter kasO*p is screened out, and the promoter and the erythromycin promoter ermE*p are compared in representation of transcriptional level and expression level in streptomyces coelicolor, streptomyces avermitilis and streptomyces venezuelae, and the results show that the modified promoter kasO*p is better than the the erythromycin promoter ermE*p.

The invention discloses a biosynthetic gene cluster of paquete amide and an application thereof. The biosynthetic gene cluster of paquete amide comes from (Streptomyces pactum)SCSIO 02999, and the cluster comprises five genes including heterozygous polyketone/ nonribosomal peptide synthetases genes ptmA, FAD dependent redox enzyme genes ptmB1, phytoene dehydrogenase genes ptmB2, cyclase genes ptmC and hydroxylase genes ptmD. According to the biosynthetic gene cluster of paquete amide and the application thereof, information in genes and proteins related to biosynthesis of the paquete amide provides theoretical foundations and materials for conducting genetic modification on the biosynthesis of multi-ring tetramate macrocylic lactam family. By conducting genetic modifications on the biological synthetic genes, 6 new structures antineoplastic paquete amide compounds pactamide A-F are obtained, and thus effective compound entities are provided for research and development of antineoplastic drugs.

The invention discloses a streptomyces coelicolor and an application thereof. The bacterial strain thereof is collected by China Center for Type Culture Collection with the collection number of CCTCC No. M 208263 and the collection date is 26th December, 2008. The invention also discloses a method for preparing pentostatin by fermenting the bacterial strain. The fermentation process provided by the invention is tested by a 10 ton fermentation tank, has stable production capacity, high fermentation unit and fewer fermentation by-products, thus lowering the difficulty for follow-up extraction and being suitable for industrialized production.

The invention provides a genetic engineering bacterium capable of promoting the synthesis of antibiotic medermycin and a method for producing the medermycin by using the same. The method comprises the steps that by taking deoxyribonucleic acid (DNA) of a genome of Streptomyces nashvillensis AM-7161 as a formwork and utilizing degenerate primers to conduct polymerase chain reaction (PCR) amplification, a new complete sequence of genes of ribosome recycling factors (RRFs) of the Streptomyces is obtained; the genes are downstream placed on an efficient promoter PtipA of the Streptomyces, so that a plasmid pHSL56.2 capable of efficently expressed in the Streptomyces is constructed; the pHSL56.2 is led into the host cell Streptomyces AM71-61, and then an engineering bacterium AM71-61/pHSL56.2 (with a preservation number of CCTCCNo:M2012093) is obtained; and when the engineering bacterium AM71-61/pHSL56.2 is used to conduct solid fermentation and liquid fermentation, the accumulation of the antibiotic medermycin can be effectively promoted. The efficient expression plasmid pHSL56.2 of the genetic engineering bacterium can also be directly led into a Streptomyces strain cell for producing other antibiotics of a benzoisochromanequinones family or other aromatic polyketide antibiotics, so as to obtain corresponding antibiotic high-yield engineering bacteria. By utilizing the method, the antibiotic high-yield bacteria can be genetically bred, so that the synthetic capability of the antibiotics is enhanced.

A method of producing butanal by optimizing the growth of Streptomyces using cellulose as food source, overexpressing a key ‘gate’ enzyme in butyric acid/butyraldehyde production, and knocking out the isobutyryl-CoA synthase gene to shunt the pathway. Optionally, the produced butanal can be isolated and converted into butanol.

The invention provides a pseudomonas engineering bacteria for producing an epirubicin. The preparation method of the pseudomonas engineering bacteria comprises the following steps: eliminating dnrH gene, dnrX gene and dnrU gene in an adriamycin biosynthesis gene cluster from streptomyces peucetius ATCC 29050; permuting dnmV gene to be aveBIV gene from an abamectin biosynthesis gene cluster; inserting a Pm promoter from pseudomonas before coding doxA gene of oxidation-reduction enzyme; and integrating the modified gene cluster and the screening marker gene into the genome of the pseudomonas putida KT2440 to obtain the pseudomonas engineering bacteria. The pseudomonas engineering bacteria lays a foundation for the heterologous expression and the large-scale industrial production of the epirubicin, thereby being wide in application value.

The invention belongs to the technical field of biological engineering and synthetic biology, and particularly relates to a multi-fragment deoxyribose nucleic acid (DNA) series connection recombination assembly method based on BT1 integrase and mutation recognition sites thereof. In the method, sixteen pairs of mutational integrase recognition sequences are provided through mutation screening and verification, on the basis, a complete set of related carriers is constructed and comprises a framework carrier and seven TA cloning vectors, the framework carrier can realize escherichia coli-streptomyces coelicolor shuttle, the seven TA cloning vectors comprise mutation substrates and are used for DNA element construction and screening, and a concrete method for multi-fragment external series connection recombination reaction is provided. The method of the invention is simple, fast and efficient and can be used for the multi-fragment fast series connection recombination assembly, and the amplification of series connection products is realized through escherichia coli transformation. The method can be widely used for combination and assembly of standard modules and elements in the synthetic biology.

The invention provides an isothermal nucleic acid amplification reaction reagent. The isothermal nucleic acid amplification reaction reagent is characterized by comprising components as follows: 100-800 mM of a Tris-HCl buffer solution, 10-150 mM of sodium chloride, 10-150 mM of potassium chloride, 10-50 mM of magnesium chloride, 5-15 mM of dithiothreitol, 5%-20% of polyvinylpyrrolidone, 10-20 mM of ATP (adenosine triphosphate), 1-5 mM of dNPTs, 10-50 mM of phosphoenolpyruvate, 500-1,500 ng/mu l of pyruvate kinase, 10-500 ng/mu l of BSA (bovine serum albumin), 25-200 pmol of each primer in a primer group, 50-200 ng/mu l of T4 bacteriophage DNA helicase gp41 protein, 100-500 ng/mu l of streptomyces coelicolor recA protein, 200-1,000 ng/mu l of single-strand binding protein and 50-200 ng/mu l of escherichia coli DNA polymerase I. The invention further provides an isothermal nucleic acid amplification method. According to the isothermal nucleic acid amplification reaction reagent and the isothermal nucleic acid amplification method, nucleic acid amplification under the isothermal condition at the lower temperature is realized, and a traditional nucleic acid amplification reaction process is greatly simplified.

The invention discloses a secondary approach transformation method based on an instruction of an FK506 production bacterial strain wave chain streptomycete genome scale metabolic network model. The model is based on annotation genes and physiology and biochemistry information. By comparing and analyzing the model with a streptomyces coelicolor genome, metabolic genes are found being highly conservative. Metabolic flux analysis is performed on a genome scale metabolic network, and therefore the model predicts a mutation bacterium secondary approach gene cluster transformation strategy for improving a production level. According to the secondary approach transformation method based on the instruction of the FK506 production bacterial strain wave chain streptomycete genome scale metabolic network model, the transformation method utilizes the genome scale metabolic network model to predict special structural genes in an FK506 bacterial strain secondary approach gene cluster, the production level of bacterial strains after transformation is improved by 20 percent to 90 percent, the special structural genes in the gene cluster are augmented to improve production capacity, and large application value is achieved in secondary approach rational transformation of microorganism immunosuppressor production bacterial strains. The high-efficiency and systematic method is provided for optimizing of the bacterial strains.

The invention relates to an nsdBmgh gene of Streptomyces roseoflavus Men-myco-93-63 as well as a preparation method and application thereof. In the invention, primers Ns8F and Ns8R are designed by utilizing an important negative regulator gene nsdB sequence in a Streptomyces coelicolor A3(2) antibiotic metabolic pathway, and genomic DNA (deoxyribonucleic acid) of Streptomyces roseoflavus Men-myco-93-63 is amplified to obtain a 1121bp segment; and two ends of a target sequence are extended by utilizing a primer anchoring polymerase chain reaction) (NPA-PCR ) method by a non-specific primer, thus obtaining the nsdBmgh gene of Streptomyces roseoflavus Men-myco-93-63. The preparation of the nsdBmgh gene provides an important basis for further researching and verifying the Streptomyces roseoflavus antibiotic metabolic pathway and regulatory mechanism, and establishes an important base for obtaining high-yield antibiotic gene engineering strains.

The invention discloses engineering bacillus subtilis capable of expressing phospholipase D, and belongs to the technical field of gene engineering. The engineering bacillus subtilis capable of expressing the phospholipase D is constructed by taking bacillus subtilis (WB600) as an expression host and taking a phospholipase D encoding gene (PLD) from streptomyces racemochromogenes as a target gene.The activity of the phospholipase D produced by the engineering bacteria can be up to 5.916 U/mL and has an extremely high application value in the field of medicines, food and health care products;meanwhile, the phospholipase D adopted by the engineering bacteria is actinomyces-derived endogenous phospholipase D, which has high reaction activity, high phosphatidyl substrate selectivity and highorganic matter stability; furthermore, a catalysis structure is the most compact; the phospholipase D is more suitable for efficient synthesis of phospholipid and a phospholipid derivative in the industrial production.

The invention discloses a method for improving the fermentation level of salinomycin by increasing supply of precursors. The method comprises the following steps: doubling acetyl coA carboxylase genes from streptomyces coelicolor, methyl malonyl coA mutase genes from streptomyces albus DSMZ41398 and crotonoyl coA reductase genes from the streptomyces albus DSMZ41398 on the chromosomes of the streptomyces albus DSMZ41398 through an integrating vector pSET152 respectively to increase supply of three precursors required for synthesizing salinomycin so as to increase the salinomycin yield. According to the method, the final fermentation yield of engineering strain salinomycin is increased by 260% and the shake flask level of a lab reaches 2 g/L.

The invention discloses a mutation screening method of a streptomyces strain SPC6-50-1. The mutation screening method comprises the steps of inducing mutation of streptomyces coelicolor and streptomyces Lzsg6 through nitrosoguanidine to obtain a streptomyces mutant library, and screening the mutant library through rifampicin and streptomycin to obtain a strain with a transcription system and a translation system in mutation. The invention also discloses a streptomyces strain SPC6-50-1 and application thereof. The streptomyces strain SPC6-50-1 disclosed by the invention has the beneficial effects that the strain contains substances having bacteriostatic activities, and the method of nitrosoguanidine (NTG) inducing as well as rifampicin and streptomycin screening can activate silent genes of the streptomyces to obtain a new metabolite, thus obtaining a new antibiotic; meanwhile, the mutation screening method has the advantages of simple operation, short cycle and high efficiency, and is not only applicable to streptomyces but also suitable for such microorganisms as myxobacteria rich in secondary metabolites; the mutation screening method has good popularization and application values.

The invention relates to construction and applications of a series of efficient heterologous expression hosts of Streptomyces coelicolor, and specifically provides genetically engineered Streptomycescoelicolor, wherein the genome of the genetically engineered Streptomyces coelicolor contains more than two attB sites. The invention further provides a method for improving the efficiency of the transformation of a multi-copy gene cluster into Streptomyces coelicolor, a method for preparing a natural product or improving the yield of a natural product, and corresponding uses thereof. According tothe present invention, a series of Streptomyces coelicolor capable of achieving the multi-copy amplification of the target gene cluster at one time are constructed by introducing a plurality of the attB sites in Streptomyces coelicolor, such that the yield of the target product is increased by increasing the number of the copies of the gene cluster.

The invention belongs to the technical fields of biotechnology and gene engineering, and in particular relates to a method for quickly constructing a gene targeting vector based on phi BT1 integrase and a mutation recognition site thereof. The invention provides three pairs of mutative intergrase recognition sequences by strict mutation screening and verification, and the mutative substrate pair has equal reaction efficiency to that of a wild type, and appears as incompatible in the same system. On the basis, the method constructs a set of related vectors comprising a backbone vector capable of realizing Escherichia coli-streptomyces coelicolor shuttle, and three TA clone vectors containing mutative substrate pairs for constructing and screening homology arms, and provides a concrete method of series recombination and reaction of four DNA fragments in vitro. The method of the invention is simple, quick and high-efficiency, can be used for constructing the gene targeting vector of streptomyces, and can be widely used for quickly constructing gene targeting vectors of different species by corresponding original substitution.

The invention relates to a method for firstly using a nanomaterial as an additive to increase the production of Streptomyces antibiotics. Compared with a traditional method of increasing the production of antibiotics, the method is simple and easy to operate, and has high operability. The method adds Streptomyces spores to a well-prepared YBP liquid medium containing different concentrations of nanoparticles, and ferments the materials for about one week, and during the period, the condition of the strain is regularly determined to produce two colored pigments, actinorhodin and undecylamine. For the first time, the method is applied to the antibiotic fermentation of Streptomyces as the additive, and the method is used to culture Streptomyces coelicolor, and the method found that the addition of 1000 mg/L of nano-alumina increases the yield of actinorhodin by 4.6 times and the yield of undecylprodigiosin by 3.7 times. The method found that the addition of 10 mg/L of nano copper increases the yield of actinorhodin by 2.1 times and the yield of undecylprodigiosin by 1.8 times.

Provided are a Streptomyces (Streptomyces hygroscopicus) HS7523 and a method for preparing milbemycin A3 by culturing the Streptomyces. The Streptomyces (Streptomyces hygroscopicus) HS7523 is deposited in “China General Microbiological Culture Collection Center” with an accession number of CGMCC No. 9672 on Sep. 16, 2014.

The invention provides daunorubicin and adriamycin producing engineered pseudomonas, which is constructed by substituting doxE for dnrM in a TDP-D-glucose 4,6-dehydratase gene lacking frame shift from adriamycin biological synthesis gene cluster of Streptomyces peucetius ATCC 29050, and integrating the TDP-D-glucose 4,6-dehydratase gene and a screened marker gene into genome of Pseudomonasputida KT2440. The daunorubicin and adriamycin producing engineered pseudomonas provides a basis for the heterologous expression and large-scale industrial production of daunorubicin and adriamycin and has high wide application value.