13 results about "Phytoene dehydrogenase" patented technology

The invention discloses yarrowia lipolytica with high yield of beta-carotene as well as a construction method and application of the yarrowia lipolytica. According to the yarrowia lipolytica engineering bacterium, geranyl diphosphate synthase gene xdGPS, phytoene dehydrogenase gene CarB, phytoene cyclization / phytoene synthesis bifunctional enzyme mutant gene GarRPY27R, acetyl-coenzyme A synthetase mutant gene ACSL641P and pyruvate ferredoxin oxidoreductase gene nifJ are integrated and expressed on a chromosome, and the yarrowia lipolytica engineering bacterium is obtained. Meanwhile, a 3-hydroxy-3-methylglutaryl CoA reductase gene HMGR (3-hydroxy-3-methylglutaryl CoA reductase) derived from the yarrowia lipolytica strain is subjected to overexpression; the yield of the beta-carotene is increased to 13.186 g / L, and the production efficiency is 0.14 g / L / h.

The invention provides a wild barley phytoene dehydrogenase gene HbPDS, a specific fragment and application of the wild barley phytoene dehydrogenase gene HbPDS. The HbPDS gene specific fragment and the recombinant virus vector pTRV2-HbPDS are constructed, a wild barley HbPDS gene VIGS silencing system is established for the first time, the phytoene dehydrogenase gene HbPDS of the wild barley can be silenced, synthesis of carotenoid of the wild barley is blocked, and the phenomena of chlorophyll fading, leaf color whitening and the like of the wild barley are caused.

The present invention relates to the use of phytoene dehydrogenase (PDS), said method for controlling weeds comprising applying a herbicide containing an effective dose of phytoene dehydrogenase inhibitor (PDSi) to a field in the presence of at least one transgenic plant, the present invention relates to a transgenic plant comprising a polynucleotide sequence encoding phytoene dehydrogenase in its genome, said transgenic plant having reduced plant damage and / or increased plant yield compared to other plants that do not have a polynucleotide sequence encoding phytoene dehydrogenase. The phytoene dehydrogenase PDS1, the phytoene dehydrogenase PDS3, the phytoene dehydrogenase PDS4, the phytoene dehydrogenase PDS5, the phytoene dehydrogenase PDS6, the phytoene dehydrogenase PDS7 and the phytoene dehydrogenase PDS8 have high tolerance to PDS inhibitor herbicides, plants containing the polynucleotide sequence for coding the phytoene dehydrogenase have high tolerance to the PDS inhibitor herbicides, and the phytoene dehydrogenase has high tolerance to diflufenican and diflufenican with the 4-time field concentration. Therefore, the application prospect on plants is wide.

The invention relates to the field of astaxanthin synthesis, and discloses recombinant saccharomyces cerevisiae as well as a construction method and application thereof. The recombinant saccharomyces cerevisiae provided by the invention comprises the following exogenous genes: coding genes of beta-carotene hydroxylase CrtZ, beta-carotene ketolase CrtW, nicotinamide adenine dinucleotide kinase, ferredoxin-NADPH (nicotinamide adenine dinucleotide phosphate) oxidoreductase and ferredoxin; on the basis of the gene, other related genes are further introduced to realize that CrtZ and CrtW are positioned in lipid droplets by lipid droplet targeting peptide Olesion, so that the yield of astaxanthin is increased, finally geranyl-geranyl diphosphate synthase, phytoene dehydrogenase and phytoene synthase are targeted to endoplasmic reticulum through endoplasmic reticulum targeting peptide, and the yield of astaxanthin is increased. Therefore, the yield of the fermentation tank is up to 440mg / L. The recombinant saccharomyces cerevisiae provided by the invention is clear in genetic background, can stably and efficiently produce astaxanthin, and has a wide application prospect.

This invention discloses an engineered strain of *Yersinia lipolytica* for synthesizing astaxanthin, its preparation method and application, a method for producing astaxanthin, and a method for increasing astaxanthin yield. The engineered strain of *Yersinia lipolytica* for synthesizing astaxanthin is obtained by expressing phytoene dehydrogenase CarB, phytoene synthase / lycopene cyclase CarRP, β-carotene ketolase CrtW, β-carotene hydroxylase CrtZ, and ferricoxane reductase RFNR in a host strain. RFNR Derived from Chlamydomonas rhinelandii Chlamydomonas reinhardtii Haematococcus pluvialis Haematococcus pluvialis This strain, through heterologous expression of RFNR, efficiently provides reducing power to CrtZ, significantly enhancing the catalytic activity of CrtZ and ultimately achieving higher astaxanthin yield.

The invention discloses an Eucommia virus induced gene silencing system as well as a construction method and application thereof. The system is obtained by infecting Eucommia ulmoides with a target gene fragment recombinant virus plasmid carrying a target gene through agrobacterium tumefaciens; a target gene is an Eucommia ulmoides phytoene dehydrogenase gene, namely an Eucommia ulmoides EuPDS gene, and the nucleotide sequence of the EuPDS gene is as shown in SEQ ID NO. 1; the target gene segment is a conservative CDS sequence on the EuPDS gene of Eucommia ulmoides, and the nucleotide sequence of the target gene segment is as shown in SEQ ID NO.2. The Eucommia virus-induced gene silencing system can be used for studying Eucommia EuPDS gene functions, Eucommia phytoene dehydrogenase metabolic pathways or Eucommia stress resistance, and has profound significance for studying the Eucommia gene functions.

A herbicidal composition and a method for controlling weeds, including one or more uracil compounds of formula (I) and a compound of formula (II), and a herbicide compound of group B and a safener of group C. A weight ratio of the uracil compounds to the herbicide compound group B and the safener group C is 1:0.02 to 1:50, and the herbicide compound of group B is one or more of compounds B-1 to B-12: B-1, acetolactate synthase inhibitors; B-2, acetyl CoA carboxylase inhibitors; B-3, protoporphyrinogen IX oxidase inhibitors; B-4, 4-hydrophenylpyrubic acid dioxygenase inhibitors; B-5, phytoene desaturase inhibitors; B-6, photosystem II inhibitors; B-7, very-long-chain fatty acid synthesis inhibitors; B-8, microtubule formation inhibitors; B-9, auxin-type herbicides; B-10, enolpyruvylshikimate-3-phosphate synthase inhibitors; B-11, glutamine synthase inhibitors; and B-12, other herbicides; or agriculturally acceptable salts or derivatives thereof

This invention provides a wild barley phytoene dehydrogenase gene. HbPDS Specific fragments and applications. A [structure / system] was constructed. HbPDS Gene-specific fragments, recombinant viral vector pTRV2-HbPDS, and the first establishment of wild barley HbPDS The VIGS gene silencing system can silence the wild barley phytoene dehydrogenase gene. HbPDS This inhibits the synthesis of carotenoids in wild barley, leading to phenomena such as chlorophyll fading and whitening of leaves.

The invention discloses a genetically engineered bacterium for producing phytoene, lycopene and beta-carotene and application of the genetically engineered bacterium, and belongs to the technical field of genetic engineering and metabolic engineering. According to the invention, endogenous phytoene synthase CrtB and phytoene dehydrogenase gene CrtI in rhodotorula host bacteria are knocked out, expression of 2-acylglycerol O-acyltransferase gene DGAT and fatty acid synthase gene FAS is knocked down, and finally, CrtB, CrtI and LCYB are selectively or jointly introduced into cytoplasm-endoplasmic reticulum-peroxisome to obtain the engineering bacteria. According to the engineering bacterium provided by the invention, glucose is used as a carbon source, the yield of phytoene, the yield of lycopene and the yield of beta-carotene are respectively and maximally 82.9 mg / L, 77.1 mg / L and 74.6 mg / L when the engineering bacterium is fermented in a 250 mL shake flask, and the cell dry basis content is more than or equal to 10%; the HPLC purity is greater than or equal to 95%.

The invention relates to the technical field of genetic engineering, and discloses a bacillus subtilis strain for producing natural products and a construction method thereof. Functional genes of a geranyl pyrophosphate synthase gene, a phytoene dehydrogenase gene and a phytoene synthetase gene for expressing and synthesizing lycopene are integrated in a chromosome of a starting bacillus subtilis strain, and one or more of 12 genes in total including 9 genes in an MEP (Methyl Ester Protein) pathway can be further integrated. The method comprises the following steps: constructing a recombinant strain of lycopene, endowing each gene with a to-be-edited RBS composed of eight independent continuous G basic groups to obtain a chassis bacterium, expressing dCas9-AID fusion protein and gRNA of a targeted RBS core region in the chassis bacterium to obtain a mutant library of which the expression levels of 12 genes are regulated at the same time, and performing high-throughput screening to obtain the recombinant strain of high-yield lycopene. According to the invention, a biological engineering strategy is adopted, and the constructed recombinant bacillus subtilis is used for synthesizing lycopene, so that a new idea is provided for high yield of lycopene by a biological method.

This invention relates to a genetically engineered strain for synthesizing retinal, its construction method, and its applications. The construction method involves introducing DNA fragments of the β-carotene 15,15'-oxygenase gene, isopentenyl pyrophosphate isomerase gene, phytoene dehydrogenase gene, geranyl-geranyl pyrophosphate synthase gene, and phytoene synthase gene into *Rhizopus cylindrica* to obtain a genetically engineered strain. This strain enhances the expression of β-carotene 15,15'-oxygenase, isopentenyl pyrophosphate isomerase, phytoene dehydrogenase, geranyl-geranyl pyrophosphate synthase, and phytoene synthase in *Rhizopus cylindrica*. By selecting *Rhizopus cylindrica* as a host, introducing key synthetic genes, and achieving stable genome integration, this method yields an engineered strain capable of efficiently synthesizing retinal using glucose as a carbon source, simplifying the production process, reducing costs, and improving industrial applicability.

The application discloses a kind of lycopene extracellular transport Saccharomyces cerevisiae strain construction and its application, belong to fermentation engineering technical field.The application constructs a kind of recombinant Saccharomyces cerevisiae strain of lycopene extracellular secretion ability, the recombinant Saccharomyces cerevisiae expressed truncated 3-hydroxy-3-methylglutaryl coenzyme A reductase, isopentenyl pyrophosphate isomerase, farnesyl pyrophosphate synthase, endoplasmic reticulum size regulator INO2, NADH kinase POS5 and ABC transporter Snq2;Heterologous expression of geranylgeranyl diphosphate synthase, phytoene dehydrogenase, bifunctional lycopene cyclase / octahydrolycopene synthase mutant CrtYBM1 (W61R) ;Knock out ROX1, EXG1 and GAL80 gene in Saccharomyces cerevisiae;And back-up orotic acid 5'-phosphorodecarboxylase expression;When its shake flask fermentation, the lycopene content of this strain extracellular reaches 12.58mg / L, and is increased to 16.5 times of starting strain, thus has wide application prospect.

The invention belongs to the technical field of plants, and particularly relates to a coix phytoene dehydrogenase ClPDS gene and a construction method of a VIGS silencing system. The invention provides a coix phytoene dehydrogenase ClPDS gene. The nucleotide sequence of the coix phytoene dehydrogenase ClPDS gene is as shown in SEQ ID No. 1; silencing a specific fragment of the coix phytoene dehydrogenase ClPDS gene, wherein the specific fragment is a fragment I, a fragment II or a fragment III; the nucleotide sequences of the fragment I, the fragment II and the fragment III are respectively shown as SEQ ID No. 2, SEQ ID No. 3 and SEQ ID No. 4. After the specific fragment is silenced, carotenoid conversion is inhibited, chlorophyll loses protection of carotenoid, chlorophyll can be destroyed by strong light for green removal, and finally, an obvious photobleaching phenomenon appears at a silenced part in a phenotype.