56 results about "Sinorhizobium meliloti" patented technology

According to the invention, through amplifying a strong promoter in Ensifer adhaerens and carrying out bioinformatics analysis and functional verification, a strong promoter is obtained, and the strong promoter can be widely used for gene expression, genetic manipulation and strain improvement in Sinorhizobium meliloti, Zymomonas mobilis, Caulobacter crescentus, Pseudomonas denitrificans, Agrobacterium tumefaciens, Brucella abortus, Pseudomonas fluorescens, Rhizobium leguminosarum, Ensifer adhaerens and other alpha-proteobacteria and has a nucleotide sequence of SEQ ID NO: 1. The invention also relates to a plasmid vector containing the strong promoter, a method for constructing a genetic engineering strain by using the strong promoter, and an application of the corresponding strain and ahost cell in starting expression of a target gene.

The invention relates to sinorhizobium meliloti and application thereof, which belong to the technical field of microbial fermentation. The sinorhizobium meliloti J09 is preserved in China Center for Type Culture Collection with the number of CCTCC NO: M 2011318. A method for applying the strain for producing manganese peroxidase through liquid fermentation comprises the following steps of: (1) slant culture; (2) seed culture; and (3) liquid fermentation culture: inoculating the cultured seed into a fermentation medium with the inoculation rate of 1 percent to 2 percent, and culturing at 32-36 DEG C for 96-136 hours with the rotating speed of a table concentrator of 150rpm. The sinorhizobium meliloti provided by the invention has the advantages that: the CCTCC NO: M 2011318 has the capability of producing the manganese peroxidase and higher biological nitrogen fixation activity. Since the strain is used for producing manganese peroxidase through liquid fermentation, the advantages that the production period is short, the production cost is low, the growth conditions are easy to control, and the like are achieved, and the method has potential for industrialization production. At the same time, the high-efficient biological nitrogen fixation activity shows that the strain has the capabilities of improving soil fertility and promoting high yield of crops.

The invention discloses salt-tolerant sinorhizobium meliloti NSM18 and a special gene cluster thereof. The gene cluster is expressed as a sequence 1 in a sequence table. The gene cluster is transferred to sinorhizobium meliloti to construct an engineering strain NSM18. Salt-tolerant experiments show that the engineering strain can tolerate the salt concentration conditions of 1.4mol/L NaCl, 1.5mol/L KCl and 0.6mol/L LiCl; and the engineering strain can be grown at the temperature of 42 DEG C, while a contrast cannot be grown, and the engineering strain shows high-temperature resistance. Moreover, apart from the advantages, the engineering strain NSM18 still keeps good nodulation and nitrogen fixation capabilities.

The invention discloses a microorganism soil conditioner for saline-alkali soil. The microorganism soil conditioner is formed by the following raw materials according to the parts by weight: 20-30 parts of ectothiorhodospirasp fermented liquid, 5-10 parts of halobacterium jilantaiense fermented liquid, 10-20 parts of lactobacillus plantarum fermented liquid, 10-15 parts of trichoderma viride fermented liquid, 5-10 parts of pseudomonas fluorescens fermented liquid, 5-10 parts of sinorhizobium meliloti fermented liquid, 20-30 parts of an organic fertilizer, 0.5-1 part of humic acid, and 0.5-1 part of Grondverbeteraar. In addition, the invention further provides a preparation method of the microorganism soil conditioner for the saline-alkali soil. The soil conditioner is capable of improvingthe soil physical and chemical properties of the saline-alkali soil, and creating a soil environment suitable for the crop growth, and improving the soil fertility and the overground part biomass thereof. In addition, the soil conditioner uses the pure biological raw materials, is green and environmental, and has no hazard to the soil and the environment.

The present invention discloses an alfalfa seed rhizobia seed coating agent and a preparation method thereof. The alfalfa seed rhizobia seed coating agent of the present invention is prepared from raw materials containing a rhizobia agent, an adhesive and a substrate, wherein the rhizobia agent is formed by uniformly mixing a rhizobia liquid and a rhizobia adsorbent, the active ingredient of the rhizobia liquid is the Sinorhizobium meliloti, the mass content of ammonium molybdate in the rhizobia agent is 0.1-0.2%, and the ammonium molybdate content in 100 g of the rhizobia agent is (0.1-0.2) g and the Sinorhizobium meliloti content in 100 g of the rhizobia agent is more than or equal to 5*10<11> cfu according to the ratio of the ammonium molybdate in the rhizobia agent to the Sinorhizobium meliloti. According to the invention, the alfalfa rhizobia and the molybdenum with the optimal concentration are matched, and the skimmed milk is added to the adhesive as the protection agent, such that the prepared alfalfa seed pill coating agent has characteristics of rhizobia activity prolonging, plant nodulation and nitrogen-fixation promoting, substantial alfalfa yield increasing and alfalfa quality improving.

The invention belongs to the field of microorganism and relates to rhizobium capable of degrading polychlorinated biphenyl and an application thereof. Sinorhizobium melilon SL1 is preserved in China General Microbiological Culture Collection Center, CGMCC on December, 10th, 2012. The collection number is CGMCC No.6962. The strain can grow by the utilization of polychlorinated biphenyl as the sole carbon source and energy, and has good capability of degrading both 2,4,4'-TCB and 3,3',4,4'-PCB under the condition of a shake flask in a laboratory. Degradation conditions are optimized, and the polychlorinated biphenyl degrading effect of the strain is further raised. The strain provides foundations for biodegradation of polychlorinated biphenyl and water body pollution restoration.

The invention discloses sinorhizobium meliloti and application thereof and belongs to the field of agricultural microorganism application. The sinorhizobium meliloti is preserved in the Common Microorganism Center of China Committee for Culture Collection of Microorganisms, the preservation number is CGMCC No. 11589, the preservation date is 25, November, 2015, and the preservation address is No. 3, courtyard 1, Beichen Rd, Chaoyang District, Beijing City. Through combined use of a sinorhizobium meliloti microbial agent and a protective agent, the nodulation rate and yield of domestic medicago sativa can be remarkably raised, and in particular, the nodulation rate of the domestic medicago sativa at the seedling stage is remarkably raised. Raising of the nodulation rate at the seedling stage shows that the sinorhizobium meliloti can enhance nodulation fixation rate and competitiveness of the inoculation microbial agent. Meanwhile, as the nodulation rate is raised, nitrogen fixation efficiency is also improved, and the plant height and yield are remarkably increased.

The invention discloses sinorhizobium meliloti with a potassium-releasing function and an application of sinorhizobium meliloti. The sinorhizobium meliloti is a strain with the preservation number of CGMCC (China General Microbiological Culture Collection Center) No.8343 or is a direct passage culture of the strain. According to the strain, potassium-rich shale of the area can be dissociated into rapidly available potassium capable of being absorbed and utilized by plants, the production period of the strain can be greatly shortened, a large quantity of cost is saved, and the application prospect is very broad.

The invention relates to a method for regenerating ATP using a rationally designed enzyme. Through rational design after sequence alignment, polyphosphate kinase from sinorhizobium meliloti is mutated and heterologously expressed; and under the catalysis of the polyphosphate kinase, the regeneration of ATP is realized by adopting polyphosphate with low polymerization degree as a phosphoric acid donor. Compared with existing ATP regeneration method, the polyphosphate kinase used in the invention is a normal-temperature enzyme which can react for coupling with multiple enzymes; the enzyme can take tetra-polyphosphate as a phosphoric acid donor; compared with phosphoric acid with high polymerization rate, the tetra-polyphosphoric acid is more common and easily available; and the feasibility of ATP regeneration is increased on the basis of simplifying the ATP regeneration process, and the cost of ATP regeneration is reduced. The activity of PPK enzyme is not inhibited by the polyphosphate concentration, and industrial large-scale production is possible.

The invention provides a strong promoter and application thereof in vitamin B<12>-producing strains. According to the invention, a strong promoter in Ensifer adhaerens is amplified; bioinformatics analysis and functional verification are carried out to obtain the strong promoter which can be widely applied to the vitamin B<12>-producing strains such as Sinorhizobium meliloti, Pseudomonas denitrificans and Ensifer adhaerens for gene expression, genetic gene operation and strain improvement, and the nucleotide sequence of the obtained strong promoter is SEQ ID NO: 1. The invention also relates to a plasmid vector containing the strong promoter, a method for constructing a gene engineering strain by using the promoter and a corresponding strain thereof, and application of a host cell in promoting expression of a target gene.

The invention relates to a re-engineering mediated sinorhizobium meliloti Rm1021 gene knockout method. The method comprises the following steps: firstly, carrying out amplification via chain reactions of overlapping-extending polymerases so as to obtain homologous fragments which have about 500bp and aim at genes to be knocked out at two sides and a combined DNA fragment of kanamycin resistance genes at the middle; secondly, electrically converting the DNA fragment into a cell Rm1021 expressed by recombinase induced by isopropyl-Beta-D-sulfo-galactoside; replacing target genes with the kanamycin resistance genes under the kanamycin resistance screening so as to obtain a gene knockout mutation strain; and finally, culturing the strain in a solid culture medium containing 0.4% of saccharose so as to eliminate plasmids containing recombinase genes. The adopted ecombinase genes are derived from Lambda phages and cloned on plasmids pLS2406. Meanwhile, the plasmids pLS2406 contain negative-screening marked sacB genes.

The invention discloses a methionine synthetase mutant, a mutant gene and an application of the methionine synthetase mutant and the mutant gene in preparation of vitamin B12. Overexpressed genetic engineering strains of a methionine synthetase gene and a mutant gene in Sinorhizobium meliloti have greatly-improved vitamin B12 producing capability, scarcely have influence on biomass during fermentation culture and have relatively high application and popularization values.

The invention discloses a strong promoter from ensifer adhaerens as well as a plasmid vector and an application of the strong promoter. Function verification is performed by amplifying one strong promoter in ensifer adhaerens, and the strong promoter which can be widely applied to gene expression, gene operation and strain improvement of alpha-proteobacteria such as sinorhizobium meliloti, zymomonas mobilis, caulobacter crescentus, pseudomonas denitrificans, agrobacterium tumefaciens, brucella abortus, pseudomonas fluorescens, rhizobium leguminosarum and ensifer adhaerens is obtained and has the nucleotide sequence being SEQ ID NO:1. The invention also relates to the plasmid vector containing the strong promoter, a method for constructing a gene engineering strain by use of the promoter, the corresponding strain and an application of a host cell in starting target gene expression.

The invention discloses a study method of functions of acid phosphatase in symbiosis of alfalfa root nodules and alfalfa mycorrhiza, and belongs to the field of studies on legumes. The study method ofthe functions of the acid phosphatase in the symbiosis of the alfalfa root nodules and the alfalfa mycorrhiza comprises the following steps: 1) selecting medicago truncatula seeds, and carrying out surface sterilizing, forced germinating and sprouting; 2) respectively inoculating the sprouted medicago truncatula with sinorhizobium meliloti and arbuscular mycorrhizal fungi, and carrying out separate pot experiments at different phosphorus concentrations; 3) detecting tissue-specific expression of MtPAP2 in the alfalfa root nodules, tissue-specific expression of MtPAP2 in the alfalfa mycorrhiza, influence of the phosphorus on MtPAP2 gene expression, influence of the phosphorus on the alfalfa root nodules and influence of the phosphorus on the alfalfa mycorrhiza; and 4) studying the roles ofthe sinorhizobium meliloti and the arbuscular mycorrhizal fungi in the symbiosis with the alfalfa by utilizing spatiotemporal expression, promoter localization, overexpression and silencing means. Thus, direct experimental evidence is obtained to provide new insights on molecular mechanisms of plant response to low phosphorus stress and coordination of phosphorus homeostasis in the plants by themselves.

The invention provides an application of nitrile hydratase in catalyzing a hydration reaction of a cyanopyrazine compound to generate an amide pyrazine compound, and belongs to the technical field ofbiochemical engineering. The nitrile hydratase is derived from Agrobacterium tumefaciens, Stappia aggregata IAM 12614 or Sinorhizobium meliloti. The cyanopyrazine compound is used as a substrate, in-vitro nitrile hydratase or a cell expressing the nitrile hydratase is used as a catalyst, the hydration reaction is carried out, and the amide pyrazine compound can be obtained. The applied raw material is high in conversion rate and free of side reaction, and the product is easy to separate and purify and is relatively high in purity; and compared with a traditional chemical catalysis process, theprocess is environmentally friendly and easy and convenient to operate, and the yield exceeds 99%.