JP6139244B2 - Polyisoprenoid production method, production agent therefor, and polyisoprenoid produced by such method - Google Patents

Description

The present invention belongs to the technical field of a method for producing a polyisoprenoid.

Natural rubber is obtained by cultivating a rubber-producing plant such as Hevea siliensis of Euphorbiaceae, and collecting natural rubber (isoprenoid) biosynthesized by milk duct cells of the plant body from the plant. However, Para rubber tree takes about 7 years from planting to becoming an adult tree from which rubber can be collected, and the period during which natural rubber (isoprenoid) can be collected is limited to 20-30 years.

In order to improve the efficiency of isoprenoid production by a rubber-producing plant, for example, ethylene or ether (2-chloroethylphosphonic acid) is applied to the trunk of a rubber-producing plant, and latex flowing out from the milk duct coagulates at the wound. A method for preventing this and improving the collection efficiency of latex is known. In addition, a method of promoting duct differentiation and increasing duct density by applying lanolin blended with jasmonic acid or its precursor linolenic acid to the trunk of a rubber-producing plant is known (non-native). Patent Document 1). However, these methods do not directly affect the mechanism of polyisoprenoid production, and the production increase effect is limited.

On the other hand, in addition to isoprenoids obtained from rubber-producing plants, methods using isoprenoids produced by genetically modified microorganisms are known. However, in terms of yield, titer, and purity, it does not fully meet the requirements of commercial processes.

Hao et al., Anals of Botany, 2000, Vol. 85, pp. 37-43.

The object of the present invention is to solve the aforementioned problems and to improve the production efficiency of polyisoprenoids.

The present inventors have added isoprenoids by adding one or more kinds of production increasing agents selected from antiseptics, antibiotics, corticosteroids, steroidal anti-inflammatory agents, anticholesterol agents, and hypertension agents to isoprenoid-producing plants. 1 having an activity selected from inhibition of the function of pentatricopeptide-containing protein encoded by Lovastatin insensitive 1 gene, inhibition of the function of respiratory chain-related enzyme, potassium channel opening, and inhibition of electron transfer 1 Adding one or more kinds of production increasing agents having an activity of increasing the expression level of HMG-CoA Reduced gene to the isoprenoid producing plant by adding more than one kind of production increasing agent to the isoprenoid producing plant. And one or more increased production inhibiting the respiratory chain complex of mitochondria by adding to the isoprenoid-producing plants, found to be able to improve the production efficiency of isoprenoids, and completed the present invention.

That is, the present invention cultures isoprenoid-producing cells in the presence of one or more kinds of production-increasing agents selected from antiseptics, antibiotics, corticosteroids, steroidal anti-inflammatory agents, anticholesterol agents, and hypertension agents. The present invention relates to a method for producing a polyisoprenoid including a step.

The present invention also relates to a method for producing a polyisoprenoid, comprising the step of culturing isoprenoid-producing cells under the presence of one or more kinds of production enhancers that inhibit hydroxymethylglutaryl-CoA reductase.

In addition, the present invention provides one kind of activity selected from inhibition of the function of a pentatricopeptide-containing protein encoded by Lovastatin insensitive 1 gene, inhibition of the function of a respiratory chain-related enzyme, potassium channel opening, and inhibition of electron transfer The present invention relates to a method for producing a polyisoprenoid comprising the step of culturing isoprenoid-producing cells under the presence of the above-mentioned production enhancer.

The present invention also relates to a method for producing a polyisoprenoid comprising a step of culturing isoprenoid-producing cells under the presence of one or more kinds of production enhancers that inhibit the mitochondrial respiratory chain complex.

It is preferable that the production enhancer is dissolved or dispersed in water or a water-soluble medium.

It is preferred that the isoprenoid producing cell is a eukaryotic cell.

It is preferred that the eukaryote is selected from noge, Hevea brasiliensis, guayule, and russian dandelion.

The eukaryote is preferably yeast.

It is preferred that the isoprenoid producing cell is a bacterial cell.

It is preferred that the bacterium is a genetically modified E. coli.

By the method of the present invention, the production efficiency of polyisoprenoid by an isoprenoid-producing plant can be improved. Hydroxymethylglutaryl CoA reductase is a major enzyme in the mevalonate pathway, and inhibition of this enzyme activates the non-mevalonate pathway and is thought to improve polyisoprenoid production efficiency.

The present invention includes a step of culturing isoprenoid-producing cells in the presence of one or more kinds of production-increasing agents selected from antiseptics, antibiotics, corticosteroids, steroidal anti-inflammatory agents, anticholesterol agents, and hypertension agents. And a process for producing a polyisoprenoid. The present invention also relates to a method for producing a polyisoprenoid, comprising the step of culturing isoprenoid-producing cells under the presence of one or more kinds of production enhancers that inhibit hydroxymethylglutaryl-CoA reductase. In addition, the present invention provides one kind of activity selected from inhibition of the function of a pentatricopeptide-containing protein encoded by Lovastatin insensitive 1 gene, inhibition of the function of a respiratory chain-related enzyme, potassium channel opening, and inhibition of electron transfer The present invention relates to a method for producing a polyisoprenoid comprising the step of culturing isoprenoid-producing cells under the presence of the above-mentioned production enhancer. The present invention also relates to a method for producing a polyisoprenoid comprising a step of culturing isoprenoid-producing cells under the presence of one or more kinds of production enhancers that inhibit the mitochondrial respiratory chain complex.

The reason why the content of isoprenoids in the tissue is improved by culturing in the presence of an electron transport inhibitor for the electron transport complex is not necessarily clear, but both of these inhibitors inhibit electron transport after the isoprenoid. Therefore, it is considered that branching occurred in the respiratory chain, and as a result, the amount of components before the branching point was increased.

Polyisoprenoid is a general term for a polymer composed of isoprene units (C ₅ H ₈ ). Examples of polyisoprenoids include monoterpenes (C ₁₀ ), sesquiterpenes (C ₁₅ ), diterpenes (C ₂₀ ), sesterterpenes (C ₂₅ ), triterpenes (C ₃₀ ), tetraterpenes (C ₄₀ ), and natural rubber. A polymer is mentioned.

The isoprenoid-producing cells are not particularly limited as long as they are cells of an organism that can be cultured to produce isoprenoids, and examples thereof include eukaryotic cells, bacteria, archaea, and the like. Examples of eukaryotic cells include yeast and plant cells.

The yeast is not particularly limited as long as it can be cultured to produce isoprenoids, and examples thereof include Saccharomyces genus such as Saccharomyces cerevisiae and Schizosaccharomyces genus such as Schizosaccharomyces pombe. Specific examples of the budding yeast include Saccharomyces cerevisiae NBRC 0262 and Saccharomyces cerevisiae NBRC 0565. Of these, the genus Saccharomyces is preferable.

The plant is not particularly limited as long as it is a plant capable of producing isoprenoids by culturing, for example, Hevea genus such as Hevea brasiliensis; Sonchus oleracesus, Sonchus asper, Hachijouna (Sonchus brachy etc.) Sonchus spp;.. goldenrod (Solidago altissima), goldenrod (. Solidago virgaurea subsp asiatica), Miyama goldenrod (. Solidago virgaurea subsp leipcarpa), tung moth Mine goldenrod (Solidago virgaurea subsp leipcarpa f palud ... Sa), giant goldenrod (Solidago virgaurea subsp gigantea), Solidago gigantea (Solidago gigantea Ait var leiophylla Fernald) Solidago genus and the like; sunflower (Helianthus annuus), Shirota et sunflower (Helianthus argophyllus), Helianthus Atororubensu (Helianthus atrorubens), Helianthus genus such as sunflower (Helianthus debilis), kohimawari (Helianthus decapetalus), giant sunflower (Helianthus giganteus); dandelion (Taraxacum), ezota POPO (Taraxacum venustum H.Koidz), Shinano dandelion (Taraxacum hondoense Nakai), Kanto dandelion (Taraxacum platycarpum Dahlst), Kansai dandelion (Taraxacum japonicum Koidz.), Dandelion (Taraxacum officinale Weber), Taraxacum such Russian dandelion (Taraxacum koksaghyz) Genus; Ficus carica, Indian rubber tree, Ficus pumila L. ), Ficus erecta Thumb., Ficus ampelas Burm.f., Ficus bengetensis Merr., Ficus irisana Elm. Examples include the genus Ficus such as Ficus septica Burm.f. and Bengalbodisis; Parhenium argentatum, lettuce (Lactuca seriola), Bengalbodaiju and the like. Among them, plants belonging to at least one genus selected from the group consisting of the genus Hevea, Sonchus, Solidago, Helianthus, Taraxacum, and Ficus are preferable, Para rubber tree, Nogeshi, Solidago, Sunflower, More preferably, it is at least one selected from the group consisting of dandelions, guayule, Russian dandelions, and figs, and more preferably at least one selected from the group consisting of para rubber tree, nogeshi, guayule, and russian dandelions. Of these, para rubber tree and nongeese are more preferable. Further, the cultured cells may be callus derived from plant tissue.

Bacteria are not particularly limited as long as they can be cultured to produce isoprenoids. For example, Escherichia, Bacillus subtilis, Lactobacillus acidophilus, Lactobacillus helveticus, Pseudomonas aeruginosa, Pseudomonas mevaloni, Pseudomonas pudica, Rhodobacter・ Spheroides, Rhodobacter capsulata, Rhodospirillum rubrum, etc. Specific examples of bacteria belonging to the genus Escherichia include Escherichia coli.

The cell may be a transformant. A transformant is obtained by introducing a foreign gene into a host cell. The foreign gene is not particularly limited, but a foreign gene involved in isoprenoid production is preferable because the production efficiency of isoprenoid can be further improved.

Foreign genes involved in isoprenoid production include farnesyl diphosphate synthase, trans-isoprenyl diphosphate synthase such as geranylgeranyl diphosphate synthase and / or neryl diphosphate synthase, undecaprenyl phosphate synthase And linear prenyl diphosphate synthase such as cis-isoprenyl diphosphate synthase. Examples of host cells include eukaryotic cells and bacteria. Among bacteria, genetically modified Escherichia coli is particularly preferable because it is inexpensive and easy to grow by genetic recombination and culture. Examples of eukaryotic cells include yeast cells and plant cells.

Increased production agents include preservatives, antibiotics, corticosteroids, steroidal anti-inflammatory agents, anticholesterol agents, and hypertensive agents, and / or substances that inhibit hydroxymethylglutaryl CoA reductase, and / or Lovastatin insensitive Substance having activity selected from inhibition of function of pentatricopeptide-containing protein encoded by one gene, inhibition of function of respiratory chain-related enzyme, potassium channel opening, and inhibition of electron transfer, and / or mitochondrial respiration Selected from substances that inhibit the chain complex. It is generally well known that isoprenoids are synthesized by two pathways, the mevalonate pathway and the non-mevalonate pathway. Because these pathways are controlled by the regulation of the respiratory chain complex in mitochondria, as a production enhancer, the activity of inhibiting the function of the pentatricopeptide-containing protein encoded by the Lovastatin insensitive 1 gene, the respiratory chain-related enzyme More preferably, it has one or more activities selected from inhibition of the function of, potassium channel opening, or inhibition of electron transport. Alternatively, it is more preferably selected from one or more substances that inhibit the HMGR gene because it controls a major enzyme in the mevalonate pathway.

An antiseptic agent refers to a substance that prevents the invasion and proliferation of microorganisms and suppresses rot and fermentation. Specific examples of the preservative include sodium azide, benzoic acid, and paraoxybenzoic acid ester. Among these, sodium azide is preferable because it causes functional inhibition of respiratory chain respiratory chain-related enzymes.

Antibiotics refer to substances produced by microorganisms that inhibit the growth of other microorganisms. Specific examples of antibiotics include antimycin, amphotericin, and fosmidomycin. Among these, antimycin is preferable because it is a respiratory chain complex inhibitor. Antimycin A is preferable as the antimycin, and the type of antimycin A may be A1 or A3.

Corticosteroids and / or steroidal anti-inflammatory agents are preferred as production increasers because they inhibit the function of HMG-CoA reductase in the mevalonate pathway. Examples of corticosteroids and / or steroidal anti-inflammatory agents include hydrocortisone, glucocorticoid, fludrocotisone, prodnisolone, dexamethasone and the like.

The anti-cholesterol agent is a generic term used as a drug that lowers blood cholesterol, and includes statin drugs such as lovastatin, mevastatin, atorvastatin, simvastatin, pitavastatin, pravastatin, and fluvastatin. Statin drugs are also known to inhibit HMG-CoA reductase, which changes HMG-CoA, which is upstream from the production of cholesterol from mevalonic acid, to mevalonic acid.

Examples of hypertensive drugs include rotenin.

Among the preservatives, antibiotics, corticosteroids, steroidal anti-inflammatory agents, anticholesterol agents, and antihypertensive agents, anticholesterol agents are preferable as the production enhancer.

In addition to the above-mentioned production enhancer, rhodanine-3-acetic acid as an antifungal agent, arachidonic acid as a respiratory chain complex I and III inhibitor, cyanate as a respiratory chain IV inhibitor, capsaicin as a flame retardant, respiratory inhibitor As azide compounds (sodium azide, etc.), amital as respiratory chain complex I inhibitor, sodium sulfide as electron transport inhibitor, n-heptylhydroxyquinoline-N-oxide as respiratory chain complex III inhibitor, electron transport inhibitor 2,3-dimercaptopropanol. These may be used alone or in combination of two or more.

In the present invention, isoprenoid-producing cells are cultured in the presence of a production increasing agent. The method for culturing cells in the presence of a production enhancer is not particularly limited as long as it is a method that can improve the production efficiency of isoprenoids. For example, a method for attaching a production enhancer to cells and culturing the cell, Examples thereof include a method of culturing cells with a culture solution containing the same.

When using woody cells such as Para rubber tree (especially woody plant individuals) as isoprenoid-producing cells, it is preferable to employ a method of attaching a production increasing agent to the cells and culturing the cells. When using cells such as herbs such as Nogeshi, yeast, bacteria, archaea, etc., it is preferable to employ a method of culturing cells in a culture solution containing a production-increasing agent.

The production enhancer is preferably used by being dissolved or dispersed in water or a water-soluble medium. By dissolving or dispersing in water or a water-soluble medium, the production enhancer can effectively act on the cells. Specifically, it is preferable that the production enhancer is used after being dissolved in a small amount of a water-soluble medium and further diluted with water. Examples of the water-soluble medium for dissolving or dispersing the production enhancer include alcohols such as ethanol, methanol and isopropyl alcohol, ketones such as acetone and ethyl methyl ketone, and dimethyl sulfoxide.

First, a method for culturing cells using a culture solution containing a production increasing agent will be described below. The isoprenoid production efficiency can be improved by culturing cells using a culture solution containing a production-increasing agent.

The culture conditions are not particularly limited as long as the cells can produce isoprenoids. The medium used for culturing cells may be any medium that is usually used for culturing cells. Specifically, in the case of bacteria, examples include KB medium and LB medium. In the case of yeast, YM medium, KY medium, F101 medium, YPD medium, and YPAD medium are exemplified. In the case of plants, White medium, Heller medium, SH medium (Schench and Hildebrandt medium), MS medium (Murashige and Skoog medium), LS medium (Linsmaier and Skoog medium), Gamburg medium, B5 medium, Examples include basic media such as MB media and WP media (Wood Plant: for wood).

The dilution ratio of water-soluble medium / (water-soluble medium + water) is preferably 1/100 to 1/1000, more preferably 1/200 to 1/800, and 1/350 to 1/650. More preferably. If the amount of water is larger than this, the necessary concentration of the production increasing agent tends not to be obtained. On the other hand, if the amount of water is less than this, the water-soluble medium may adversely affect the cells that produce the isoprenoid.

The concentration of the production-increasing agent in the culture solution is preferably a concentration that improves the production efficiency of isoprenoids and that does not inhibit cell culture.

The concentration of the production-increasing agent in the culture solution is preferably 10 to 1000 nM, and preferably 50 to 800 nM in order to improve the synthesis efficiency of isoprenoids and prevent the cost from being increased unnecessarily. More preferably, it is most preferable that it is 100 nM-500 nM.

In addition, when using a plant cell as an isoprenoid-producing cell, it is preferable to use one or more kinds of plant growth hormones together with a production increasing agent in the cell culturing step. Examples of plant growth hormones include auxin plant hormones and cytokinin plant hormones.

As the carbon source, any carbon compound can be used as long as it is capable of assimilating and growing isoprenoid-producing cells. Examples of such a carbon source include sugars and / or fats and oils.

Examples of the saccharide include monosaccharides, disaccharides, oligosaccharides, polysaccharides such as sucrose, lactose, maltose, trehalose, glucose, allose, talose, gulose, altrose, mannose, fructose, idose, galactose, and xylose. For example, enzymatically treated sucrose syrup) can be used.

Examples of the fats and oils include soybean oil, castor oil, cottonseed oil, linseed oil, rapeseed oil, palm oil, coconut oil, peanut hot water, rosin, pine oil, pine tar, tall oil, corn oil, rice bran oil, beet flower oil, sesame oil Olive oil, sunflower oil, palm kernel oil, coconut oil, jojoba oil, macadamia nut oil, tung oil, and glycerol, glycerin, fatty acid, etc. produced by decomposing them can be used. The addition amount of the carbon source is preferably 5 to 400 g / L, more preferably 20 to 100 g / L, based on the medium, including saccharides and fats and oils.

As the nitrogen source, for example, inorganic nitrogen sources such as ammonium sulfate, ammonium chloride, and ammonium nitrate, and organic nitrogen sources such as yeast extract, peptone, and meat extract can be used. In addition to these, inorganic salts, metal salts, vitamins, and the like can be added as necessary.

Although culture | cultivation temperature changes with the kind of cell, it is preferable that it is 0-50 degreeC, it is more preferable that it is 10-40 degreeC, and it is still more preferable that it is 20-35 degreeC. The pH is preferably from 3 to 11, more preferably from 4 to 10, and even more preferably from 5 to 9. In addition, the culture can be performed under anaerobic conditions or aerobic conditions depending on the cell type.

Cells can be cultured by batch culture or continuous culture using a bioreactor. Specific culture methods include shaking culture, rotary culture, and the like. The isoprenoid can be accumulated intracellularly and can also be produced and accumulated in the culture supernatant.

When obtaining isoprenoids from cultured cells, the cells can be collected by centrifugation, then disrupted, and extracted from the disrupted solution using a solvent such as 1-butanol. In addition, a known purification method such as chromatography can be appropriately used in combination with the solvent extraction method. Here, the disruption of the cells is preferably performed at a low temperature such as 4 ° C. in order to prevent the isoprenoid from being denatured / disintegrated. The cells can be disrupted by, for example, physical disruption using glass beads.

To obtain isoprenoids from the culture supernatant, the cells are removed by centrifugation, and then extracted from the obtained supernatant with a solvent such as 1-butanol.

Next, a method for culturing cells by attaching a production increasing agent to the cells will be described. This method can be suitably applied to plant cells, particularly plant individuals. For example, the production amount of isoprenoid can be increased in the para rubber tree by attaching a production increasing agent to the adult para rubber tree.

The concentration of the production enhancer attached to the plant is preferably 10 to 1000 nM, more preferably 50 to 800 nM, and even more preferably 100 to 500 nM. By setting in this way, it is possible to increase the polyisoprenoid synthesis efficiency and prevent the cost from being increased unnecessarily at a high concentration.

Moreover, it is preferable that the quantity per plant of the production increasing agent made to adhere to a plant is 10-500000 nM, It is more preferable that it is 100-200000 nM, It is further more preferable that it is 10-1000 micromol, It is 200-100000 nM Is particularly preferred.

Prior to the step of attaching the production enhancer to the isoprenoid-producing plant, it is preferable to peel off the cork layer of the isoprenoid-producing plant and attach the production enhancer to the peeled portion. Since the surface of the isoprenoid-producing plant is covered with a hard cork layer, the production increase effect can be enhanced by peeling the cork layer to make it easier for the production increasing agent to reach the tissue inside the cork layer.

The cork layer is a layer located in the outer bark of the isoprenoid-producing plant and existing outside the ductal cells and the ductal cell-forming tissue. The part of the stem or stem to be peeled is not particularly limited as long as it is a part that can increase the production of isoprenoid by attaching a production increasing agent to the part, but it is in the vicinity of the part where latex is recovered by tapping A part is preferred. The thickness of the part to be peeled is not particularly limited as long as it is a thickness that peels off the cork layer without damaging the duct cells and the ductal cell-forming tissue. The thickness is preferably 0.5 to 8 mm, more preferably 3 to 6 mm.

The method of peeling a cork layer is not specifically limited, It can carry out using the method normally used for peeling of bark etc. For example, there is a method in which a cork layer is peeled off by scratching a part of a stem or stem using a knife or the like. Further, the timing of peeling and the number of parts to be peeled are not particularly limited as long as the isoprenoid production increase effect is obtained. The type and concentration of the active ingredient of the latex booster, the attachment method, the age and type of the plant It can be appropriately determined in consideration of the above.

After the cork layer is peeled off, the time of attachment of the production enhancer to the plant is not particularly limited as long as the production enhancer can act on the plant through the part where the cork layer is peeled off. After peeling, it is preferably within 5 years, more preferably within 1 year, even more preferably within half a year, and particularly preferably within 1 month. After the cork layer is peeled off, if the production enhancer adheres within the above period, the production enhancer is allowed to act before the cork layer is regenerated, so that the regenerated cork layer prevents the production enhancer from reaching the tissue. The situation can be avoided.

Examples of the site where the production-increasing agent is attached include the trunk, stem, and root of an isoprenoid-producing plant. Among these, it is preferable to adhere to the stem and stem because there are many ductal tissues that produce isoprenoids. The attachment method is not particularly limited as long as it can be attached directly to the trunk, stem, or root of the isoprenoid-producing plant. For example, a brush that is dissolved or dispersed in water or a water-soluble medium as described above is used. Etc. may be applied directly to the trunk, stem and root, or may be sprayed using a spray or the like.

It is also possible to use a plant growth hormone in combination with the above-mentioned production enhancer. Examples of plant growth hormones include ethylene, jasmonic acid or derivatives thereof.

Instead of ethylene, it is also possible to use an ethylene generator, Ethephon (2-chloroethylphosphonic acid). Ethephon includes a 10% Ethrel solution.

Jasmonic acid or a derivative thereof is preferably a compound represented by the following general formula (I).

（式中、Ｒ^１は炭化水素基であり、Ｒ^２は水素原子又は炭化水素基である）

(Wherein R ¹ is a hydrocarbon group and R ² is a hydrogen atom or a hydrocarbon group)

The concentration of the plant growth hormone attached to the plant is preferably 0.05% (w / v) or more when prohydrojasmon is used as an active ingredient, for example, 0.05 to 0.1. % (W / v) is more preferable.

The timing of attachment of the plant growth hormone to the isoprenoid-producing plant is not particularly limited as long as the plant growth hormone can act on the plant.

The isoprenoid can be recovered as an effluent from a cut milk duct by scratching (tapping) the isoprenoid-producing plant with a knife or the like in a groove shape.

The weight average molecular weight (Mw) of the polyisoprenoid produced by the method of the present invention is preferably 1000 or more, more preferably 10,000 or more, further preferably 100,000 or more, and 200,000 or more. Is most preferred. If it is less than 1000, it tends to be difficult to use as rubber. The upper limit of the weight average molecular weight is not particularly limited. A weight average molecular weight can be calculated | required by values, such as standard polystyrene conversion, based on the measured value by a gel permeation chromatograph (GPC).

The content of 1,4-cis structure in the isoprene unit contained in the polyisoprenoid produced by the method of the present invention is preferably 10 mol% or more, more preferably 30 mol% or more, and 60 More preferably, it is more than mol%, and still more preferably more than 90 mol%. The upper limit of the content of the 1,4-cis structure is not particularly limited. The content of the 1,4-cis structure can be measured by NMR.

The production amount of the produced isoprenoid can be measured by an iodine coloring method by thin layer chromatography and a GC / MS method.

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to the following examples.

(Preparation Example 1) Preparation of a production enhancer An anticholesterol agent, which affects mitochondrial energy production by inhibiting HMG-CoA reductase, and functions the pentatricopeptide-containing protein encoded by the Lovastatin insensitive 1 gene Inhibiting, inhibiting the function of respiratory chain-related enzymes, opening potassium channels, inhibiting electron transfer, and inhibiting mitochondrial respiratory chain complex, 10 mg of lovastatin was dissolved in 24.7 cc of water to make 1 mmol / L. Further, this was diluted 100 to 1000 times with water.

(Examples 1 to 3) Application of a production-increasing agent to the surface of a para rubber tree trunk 15 para rubber trees at the age of 10 years were selected per one production-increasing agent, and a thickness of 5 mm from the surface of a part of the trunk was selected using a knife. The cork layer of was peeled off. Thereafter, peeling was repeated once a month. Two weeks after the first peeling of the cork layer, the three types of concentration increasing agents prepared in Preparation Example 1 were attached to 15 para rubber trees. Adhesion was carried out by applying with a brush so that the adhesion amount of the production enhancer per plant was 100 μmol at a concentration of 0.1 ml / cm ^{2 on} the trunk surface. Thereafter, application was repeated once every two weeks.

Two of the 15 of each 15 were tapped two days after the first application of the production-increasing agent, and the amount of rubber recovered from the latex was measured. The tapping was carried out every 2 days for 3 months, and the application of the production increasing agent was continued for 3 months after the collection. The total amount of rubber of each para rubber tree for 3 months was measured, and the average value of the five para rubber trees was taken as the recovered rubber amount.

(Comparative Example 1)
Example 1 except that 20 liters of ethanol not containing lovastatin was added to 1L by adding 500 liters of water to dilute to 1 L as a control product, except that it was applied to five 10-year-old para rubber trees. The same operation as 3 was performed, and the total amount of rubber produced was measured.

(Examples 4 to 6) Combined use of an ethylene generator with a production enhancer A production enhancer was applied to para rubber tree in the same manner as in Examples 1 to 3. Four weeks after the first application of the production-increasing agent, 5 were selected from the para rubber tree to which the production-increasing agent was applied, and Ethephon (10% Ethrel solution) was adhered as an ethylene generator. The ethephon was attached to the tapped tissue by coating so as to be 0.01 g / wood. Thereafter, the application was repeated once every 30 days.

Two para rubber trees were tapped two days after the first application of the production-increasing agent, and the amount of rubber recovered from the latex was measured. Tapping was performed every 2 days for 3 months, and the application of the above-mentioned production increasing agent was continued for 3 months after the collection. The total amount of rubber of each para rubber tree for 3 months was measured, and the average value of the five para rubber trees was taken as the recovered rubber amount.

(Comparative Example 2)
Example 4 to Example 4 except that 20 liters of ethanol not containing lovastatin was added to water and diluted to 1 L to make 1 L instead of the production enhancer, and applied to five 10-year-old para rubber trees as a control production enhancer. The same operation as 6 was performed, and the total amount of rubber produced was measured.

Preparation Example 2 Preparation of Jasmonic Acid Solution A jasmonic acid solution containing prohydrojasmon as an active ingredient was prepared. Specifically, a jasmmate solution (manufactured by Meiji Seika Co., Ltd.) is diluted with a solution of 1% carboxymethyl cellulose (hereinafter referred to as “CMC”), and a 50-fold diluted solution (0.1%) Prohydrojasmon solution) was prepared. The composition of the jasmmate solution is as follows: 5% prohydrojasmon, 33% 1-propanol, 30% surfactant, and 32% water.

(Examples 7 to 9) Except that the jasmonic acid solution and the ethylene generator were used together with the production enhancer, and at the same time, the above-mentioned jasmonic acid solution was applied together so as to be 0.1 ml / cm ^2. In the same manner as in 4-6, the production-increasing agent was applied and Ethephon was attached.

About five each, tapping was performed 2 days after the application of the production-increasing agent, and the amount of rubber recovered from the latex was measured. Tapping was performed every 2 days for 3 months, and the application of the above-mentioned production increasing agent was continued for 3 months after the collection. The total amount of rubber of each para rubber tree for 3 months was measured, and the average value of the five para rubber trees was taken as the recovered rubber amount.

(Comparative Example 3)
A jasmonic acid solution was applied in the same manner as in Examples 7 to 9 except that the production-increasing agent was not applied, Ethephon was attached, and the total amount of rubber produced was measured.

The total amount of rubber obtained in Examples 1 to 9 and Comparative Examples 2 to 3 was converted into an index with the total amount obtained in Comparative Example 1 as 100. The results are shown in Table 1.

The weight average molecular weights (Mw, in terms of polystyrene) of the rubbers obtained in Examples 1 to 9 and Comparative Examples 1 to 3 were measured by gel permeation chromatography (GPC) under the following conditions (1) to (7). It was measured.
(1) Apparatus: HLC-8020 manufactured by Tosoh Corporation
(2) Separation column: GMH-XL manufactured by Tosoh Corporation
(3) Measurement temperature: 40 ° C
(4) Carrier: Tetrahydrofuran (5) Flow rate: 0.6 mL / min (6) Detector: Differential refraction, UV (215 nm)
(7) Molecular weight standard: Table 1 shows the standard polystyrene measurement results.

From the results of Table 1, it was confirmed that polyisoprenoid production can be efficiently increased with the polyisoprenoid production-increasing agent. In addition, it was confirmed that a polyisoprenoid having a molecular weight almost the same as that in the case of using no production increasing agent can be obtained.

(Examples 10 to 12) Production of farnesyl diphosphate by yeast in the presence of a production-increasing agent YL medium (manufactured by Difco) 10 L was subdivided into 10 2 L Erlenmeyer flasks at 121 ° C. and 1.2 atm. Autoclave sterilization was performed for 20 minutes. To this medium, 10 ml of the production increasing agent of Preparation Example 1, 5% glucose, and 1% soybean oil were aseptically added. The final concentration of the production enhancer in the medium was 150 nM (Example 10), 300 nM (Example 11), and 450 nM (Example 12), respectively. Saccharomyces cerevisiae (NBRC 0262) purchased from the National Institute for Product Evaluation Technology was inoculated. The culture was performed at 30 ° C. and 130 rpm for 72 hours.

After completion of the culture, the cells in the culture solution were transferred to a plastic tube, added with glass beads (Sigma), and cooled and crushed at 4 ° C. using a multi-bead shocker manufactured by Yasui Kikai. The cells were crushed by repeating 20 cycles of crushing at 2500 rpm for 30 seconds and stopping for 30 seconds.

The cooled and crushed liquid of the bacterial cells was centrifuged at 10,000 rpm for 15 minutes. Farnesyl diphosphate was extracted by adding 250 mL of 1-butanol to the supernatant after centrifugation in several portions, and concentrated using an evaporator. The amount of farnesyl diphosphate produced was measured by iodine coloration by thin layer chromatography and GC / MS.

(Comparative Example 4) Production of farnesyl diphosphate The same as in Examples 10 to 12 except that 20 liters of ethanol not containing lovastatin was added with water to dilute it 500 times to make 1 L as a control production enhancer. The operation was performed and the amount of farnesyl diphosphate produced was measured.

The yield of farnesyl diphosphate obtained in Examples 10 to 12 was converted into an index with the yield of Comparative Example 4 as 100. The results are shown in Table 2.

From the results shown in Table 2, it was confirmed that polyisoprenoids can be produced more efficiently by using a production-increasing agent than in the prior art.

Furthermore, microbial cells were taken out from the media described in Examples 10 to 12 and Comparative Example 4, and gene expression in the microbial cells was analyzed and compared by RT-PCR (Reverse Transcription Polymerase Chain Reaction). From the result, it was found that the production increasing agent decreased the expression level of the IPP isomerase gene and increased the expression level of the HMG-CoA Reduced gene. Although the expression level of HMG-CoA Reductase gene increases, the activity is considered to decrease as a result of the production increasing agent inhibiting HMG-CoA Reductase.

(Examples 13 to 15) Production of geranyl diphosphate using yeast in the presence of a production increasing agent Culture and extraction were performed under the same conditions as in No. 12, and geranyl diphosphate was recovered. The production amount of geranyl diphosphate was measured by iodine coloration method by thin layer chromatography and GC / MS.

(Comparative Example 5) Production of geranyl diphosphate Similar to Examples 13 to 15 except that water was added to 20 cc of ethanol not containing lovastatin and diluted 500-fold to make 1 L as a control production enhancer. Operation was performed and the amount of geranyl diphosphate produced was measured.

The yield of geranyl diphosphate obtained in Examples 13 to 15 was converted into an index with the yield of Comparative Example 5 as 100. The results are shown in Table 3.

From the results shown in Table 3, it was confirmed that polyisoprenoids can be produced more efficiently by using a production-increasing agent than in the prior art.

Furthermore, microbial cells were removed from the media described in Examples 13 to 15 and Comparative Example 5, and gene expression in the microbial cells was analyzed and compared by RT-PCR (Reverse Transcription Polymer Chain Reaction). From the result, it was found that the production increasing agent decreased the expression level of the IPP isomerase gene and increased the expression level of the HMG-CoA Reduced gene. Although the expression level of HMG-CoA Reductase gene increases, the activity is considered to decrease as a result of the production increasing agent inhibiting HMG-CoA Reductase.

(Preparation Example 3) Preparation of culture medium for aseptic culture A medium for aseptic culture was prepared in a solution diluted 2000 times based on Hyponex with a solidifying agent concentration of 1% by mass. After autoclaving (121 ° C., 20 minutes), the production increaser of Preparation Example 1 was added and solidified. Hyponex stock solution (manufactured by Hyponex Japan) was used as the Hyponex. As a solidifying agent, agar, agarose and gelatin were used. The final concentration of the production increasing agent in the medium was 150 nM (Example 16), 300 nM (Example 17), and 450 nM (Example 18), respectively.

(Examples 16 to 18) Addition of a production-increasing agent to Nogeshi Five sterile cultivations with a plant height of about 20 cm were selected per one production-increasing agent and transplanted to the medium for aseptic culture prepared in Preparation Example 3. In the transplantation, the roots of Nogeshi were planted so that they grew in the medium so that the production-increasing agent was absorbed from the roots.

Three of each nine were transplanted to a medium containing a production-increasing agent, and five days after the transfer, the milk taken from the noge plant was collected from the stem, and the amount of polyisoprene was measured. In addition, collection | recovery of the emulsion from a stem was performed 3 times every 5 days. The average value of three nodules from the amount of polyisoprene in each concentration and each growth period was taken as the amount of recovered polyisoprene.

(Comparative Example 6)
Except for not adding any of the production-increasing agent, water, and ethanol, Nogeshi was cultured by the operation described in Examples 16 to 18, and the amount of recovered polyisoprene was measured.

(Comparative Example 7)
In place of the production increaser, water was added to 20 cc of ethanol not containing lovastatin, and diluted to 1L by 500 times was added to Nogeshi's sterile culture medium as a control production increaser. Except for adding ethanol, the same operations as in Examples 16 to 18 were performed, and the amount of recovered polyisoprene was measured.

The total amount of isoprene obtained in Examples 16 to 18 and Comparative Example 7 was converted into an index with the total amount obtained in Comparative Example 6 as 100. The results are shown in Table 4.

The gel permeation chromatograph (GPC) method was used for the polyisoprene obtained in Examples 16 to 18 and Comparative Examples 6 to 7 under the following conditions (1) to (7) under the conditions (1) to (7). It was measured by.
(1) Apparatus: HLC-8020 manufactured by Tosoh Corporation
(2) Separation column: GMH-XL manufactured by Tosoh Corporation
(3) Measurement temperature: 40 ° C
(4) Carrier: Tetrahydrofuran (5) Flow rate: 0.6 mL / min (6) Detector: Differential refraction, UV (215 nm)
(7) Molecular weight standard: Table 4 shows the standard polystyrene measurement results.

From the results shown in Table 4, it was confirmed that polyisoprenoid production can be efficiently increased by the polyisoprenoid production-increasing agent. In addition, it was confirmed that a polyisoprenoid having a molecular weight almost the same as that in the case of using no production increasing agent can be obtained.

Claims (7)

A method for producing a polyisoprenoid, comprising a step of culturing isoprenoid-producing cells in the presence of a statin drug . A statin drug dissolved or dispersed in water or an aqueous medium,
The method for producing a polyisoprenoid according to claim 1. Isoprenoid producing cells are eukaryotic cells,
The manufacturing method of the polyisoprenoid of Claim 1 or 2 . The eukaryote is selected from noge, Hevea brasiliensis, guayule, and russian dandelion;
The method for producing a polyisoprenoid according to claim 3 . The method for producing a polyisoprenoid according to claim 3 , wherein the eukaryote is yeast. Isoprenoid producing cells are bacterial cells,
The manufacturing method of the polyisoprenoid of Claim 1 or 2 . The bacterium is a genetically modified E. coli,
The manufacturing method of the polyisoprenoid of Claim 6 .