CN103740600B - A kind of bacterial strain of cellulase-producing - Google Patents
A kind of bacterial strain of cellulase-producing Download PDFInfo
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Abstract
The present invention discloses a strain Trichodermareesei (Trichoderma reesei) bacterial strain, the invention belongs to field of microbial fermentation, Trichodermareesei (Trichoderma reesei) the strain fermentation production of cellulose enzyme utilizing a strain deposit number to be CCTCC NO:M2013540.The optimal pH 3.0-6.0 of described bacterial strain cellulase-producing, optimum temperuture is 23 ~ 35 DEG C.The seed liquor of described bacterial strain is inoculated in fermention medium, cultivate 104 hours for 25 DEG C, the circumscribed beta-glucanase of fermented liquid cellulase, Endo-β-glucanase, beta-glucosidase and filter paper enzyme activity reach 680U/mL, 1389U/mL, 486U/mL and 792U/mL respectively.
Description
Technical field
The invention belongs to microorganism field, particularly a kind of fungi of cellulase-producing.
Background technology:
Cellulase is extensively present in natural organism.Bacterium, fungi, cellulase can be produced in animal body etc.The cellulase being generally used for production comes from fungi, more typically has wooden enzyme to belong to (Trichodema), Aspergillus (Aspergillus) and Penicillium (Penicillium).Cellulase is all widely used in food service industry and environmental industry.When carrying out zymamsis, the interpolation of cellulase can increase the utilization ratio of raw material, and promotes to some extent vinosity.
Cellulase is of a great variety, originates very wide.Its structure and function of the cellulase of different sources differs greatly.Because fungin production of enzyme is high, activity large, therefore the cellulase mainly fungal cellulase applied in livestock industry and fodder industry.
Cellulase can be divided into endoglucanase (1 according to the difference of its catalyzed reaction function, 4-β-D-glucanglucanohydrolase or endo-1,4-β-D-glucanase, EC3.2.1.4), from the abbreviation EG of fungi, from abbreviation Cen, the exoglucanase (1 of bacterium, 4-β-D-glucan cellobilhydrolase or exo-1,4-β-D-glucannase, EC.3.2.1.91), from the abbreviation CBH of fungi, the abbreviation Cex from bacterium) and beta-glucan glycosides enzyme (β-1,4-glucosidase, EC.3.2.1.21) be called for short BG.The unformed area of endoglucanase random cutting fibre element polysaccharide chain inside, produces the oligosaccharides of different lengths and the end of new chain.Exoglucanase acts on the end of the fibrination sugar chain of these reductibilities and irreducibility, release glucose or cellobiose.Beta-glucosidase hydrolysis fiber disaccharides produces bimolecular glucose.Fungin production of enzyme is high, active large, the cellulase in main using fungus source in livestock industry and feed work.
Cellulase reaction and general enzyme reaction different, its topmost difference is that cellulase is polycomponent enzyme system, and substrate structure is extremely complicated.Due to the water-insoluble of substrate, the adsorption of cellulase instead of the ES mixture process of enzyme-to-substrate formation.Cellulase is first adsorbed on substrate Mierocrystalline cellulose specifically, then under the synergy of several component, cellulose decomposition is become glucose.
Nineteen fifty, Reese etc. propose C1-Cx hypothesis, and this hypothesis is thought and must be acted synergistically with different enzymes, Mierocrystalline cellulose could be hydrolyzed to glucose thoroughly.Synergy is commonly considered as endoglucanase (C1 enzyme) the first cellulosic noncrystalline domain of attack, form the new free-end needed for Cx, then cut cellobiose unit by CX enzyme from the reducing end of polysaccharide chain or non-reducing end, finally by beta-glucan glycosides enzyme, cellobiose is hydrolyzed into two glucose.But, the synergy order of cellulase is not absolute, and find in research subsequently, C1-Cx and beta-glucan glycosides enzyme must exist simultaneously could be hydrolyzed natural cellulose.If first use C1 enzyme effect crystalline cellulose, then remove C1 enzyme, then add Cx enzyme, crystalline cellulose but can not be hydrolyzed by sequential action like this.
Strain improvement is the basic work of cellulase production, domestic and international many experts have carried out large quantity research, in order to produce high-quality cellulase product, Wang Jialin etc. (1996) are on the basis absorbing domestic and foreign experience, successively viride wood 10, viride Sn-91014, koning trichoderma NT-15, aspergillus niger XX-15A are introduced, on this basis, have employed ultraviolet, specific electromagnetic wave radiation, linear accelerator, the mutafacient system of the physics such as nitrosoguanidine, chemistry, obtains superior strain NT15-H, NT15-H1, XT-15H, XT-15H1.Wherein wooden mould NT-15H solid culture vigor detects through station, China National Light Industrial Products Department food quality supervision inspection center Nanjing and shows, filter paper vigor is 3670u/g, C1-enzyme activity 24460u/g, and Cx-enzyme activity 1800u/g, reaches advanced world standards.The stable performance in factorial praluction of this bacterial classification.Zhang Linghua etc. (1998) adopt koning trichoderma W-925, J-931, after over-richness is 2% ethyl sulfate and ultraviolet (15W, 30cm, 2min) complex mutation, obtain the Wu-932 bacterial classification that inulinase-producing activity is high, this bacterial classification CMC saccharogenic power reaches 2975, filter paper anase activity is 531, and than setting out, bacterium W-925 improves 100% and 81% respectively.After feed additive technology service centre of the Ministry of Chemical Industry king Cheng Shu etc. (1997) adopt the Trichodermareesei A3 at this center first to carry out ultraviolet and nitrosoguanidine complex mutation, by the spore inoculating that processed on fiber double-layer plate, cultivate 5-8 days for 30 DEG C, place 7-10 days for 15 DEG C, select transparent circle diameter and the larger single bacterium colony of colony diameter to carry out triangular flask solid state fermentation and screen again, obtain the Trichodermareesei 91-3 bacterial strain that cellulase-producing vigor is very high.
The production technique of cellulase mainly contains two kinds, i.e. solid fermentation and liquid fermenting, and its technique is as follows:
1, affect the factor of yield of enzyme and vigor: the factor affecting yield of cellulase and vigor is a lot, except bacterial classification, also have culture temperature, pH, moisture, matrix, incubation time etc.These factors are not isolated, but connect each other.Zhang Zhongliang etc. (1997) adopt homogeneous design Cl12 (1210), with viride (T.ViriclePers.expr) for bacterial classification, have studied the effect to yield of enzyme and vigor of the five large factors that affect cellulase-producing, think that matrix crude fiber content is 40%, initial pH7.5, add water 4 times, under 26-31 DEG C of condition, cultivate 45h can obtain maximum yield of enzyme 26mg/g and CMC enzyme activity 20mg/gh.Wang Chenghua etc. (1997) also studied the condition of enzyme production of the Trichodermareesei 91-3 of its mutagenesis screening, result shows that this bacterial classification is with the straw powder of 7:3 and wheat bran, another interpolation 4% ammonium sulfate, 0.4% potassium primary phosphate, 0.1% magnesium sulfate are optimal medium, 28-32 DEG C is suitable culture temperature, 30 DEG C is optimum temps, 4% is optimum inoculation amount, and 96h arrives fermentation peak.Zhang Linghua etc. (1998) have studied with koning trichoderma W-925 for the bacterium that sets out, the optimal conditions of fermentation of the Wu-932 High-Cellulase-Yielding bacterium obtained after mutagenesis.Result shows, with the wheat bran of 1:2 and rice straw powder for substratum, the inoculum size of 5%, straw pulverizes mean length 3-5mm, initial pH4-5, and temperature is at 28-35 DEG C, and fermentation time 72h is optimal conditions of fermentation.
Number of patent application is 201010040047, applicant Zhejiang University, the invention provides a kind of method of production of cellulose enzyme, comprises the following steps: by Trichodermareesei (TriCh.Derma reesei) be seeded in fermention medium, start feeding culture after fermentation, in feeding culture process, when fermented liquid pH value higher than 4.8 time, fed-batch medium, when fermented liquid pH value lower than 4.5 time, stop fed-batch medium, total fermentation time reaches 192-240 hour, stops fermentation.Insoluble carbon source and solubility carbon source organically combine by the inventive method, the expression of co-induction cellulose enzyme gene.The forming process of the growth of bacterial classification and object meta-bolites is made to reach coordinated balance by feeding culture, solve merely with Problems existing in Mierocrystalline cellulose or the soluble sugar technique that is inductor production of cellulose enzyme, effectively improve the fermentation level of cellulase, and the degradation property of cellulase to cellulosic substrate obtained is stronger.
The preparation method of application number 2,013,102,687,288 1 kinds of low-temperature neutral cellulases, described low-temperature neutral cellulase is prepared by bacterial strain with Trichodermareesei, this preparation method comprises: activated spawn, ultraviolet mutagenesis, then cultivate at low temperatures, purifying, and purifying bacterial strain is prepared seed liquor in 10-15 DEG C of bottom fermentation, seed liquor is inoculated in culture medium, cultivate 96-144 hour at 10-15 DEG C, just obtain low-temperature neutral cellulase; Present invention also offers a kind of preparation method of described low-temperature neutral cellulase.Beneficial effect of the present invention is: simple to operate, and fermentation period is short, can reduce the application of temperature of enzyme, thus reduces the power consumption of industrial application, makes its more environmental protection, has broad application prospects; In addition, present invention also offers a kind of preparation method of this cellulase, it can be widely used in the modification of paper-making fibre, reduces the cost of paper industry fibre modification.
Summary of the invention
Technical problem to be solved by this invention is to provide the high and Li's Trichoderma strains of good stability of a strain cellulase-producing vigor.Trichodermareesei provided by the present invention (Trichodema reesei) 601-17, this bacterial strain is preserved in China typical culture collection center on November 3rd, 2013, deposit number is CCTCC NO:M2013540, Classification And Nomenclature is Trichodermareesei 601-17Trichodema reesei601-17, preservation address: Luo Jia Shan Wuhan University of wuchang, wuhan district Life Science College, postcode 430072.
Described bacterial strain physiological and biochemical property:
This bacterial strain is at PDA cultured on solid medium, and the colony characteristics of formation is bacterium colony is flocculence, and bacterium colony is light green, and bacterium colony is flat, high 0.1-0.75mm, colony edge white, neatly; Fast growth, 48h colony diameter reaches 1.0-8.5mm, and 72h reaches 30-50mm; White mycelium, has barrier film, and mycelia wall is smooth, and diameter is at 2-5 micron.Conidiophore occurs, to life on side shoot from the short lateral branch of mycelia.Conidiophore is ampuliform, and uprightly, colourless, spore is spherical in shape, green, diameter 20-100 micron.
This bacterial strain can grow on wheat bran, and main metabolites is cellulase (endo cellulase, exocellulase and glucuroide).According to " An Introduction industrial mycology " (George Smith1954), " Fungal identification handbook " (Wei Jing surpasses 1982), " common and conventional fungi " (institute of microbiology of the Chinese Academy of Sciences 1973), identify that this bacterial strain is: Trichodermareesei.
Cultural characteristic: the optimal pH 3.0-6.0 of this bacterial strain cellulase-producing; Optimum temperuture is 23 ~ 35 DEG C.
Seed liquor is inoculated in fermention medium, 25 DEG C cultivate 104 hours, fermented liquid cellulase circumscribed beta-glucanase, Endo-β-glucanase, beta-glucosidase and filter paper enzyme activity reach 680U/mL, 1389U/mL, 486U/mL and 792U/mL respectively.
Utilize Li's Trichoderma strains, as follows by the method for ultraviolet mutagenesis, cultivation, fermentative production cellulase.
Li's Trichoderma strains is inoculated on slant activation substratum, activated spawn; Cultivate the bacterial classification after activation, picking list bacterium colony prepares spore suspension, and uses uviolizing spore suspension, and mutagenesis obtains spore bacterium colony;
Spore bacterium colony after mutagenic and breeding is coated in primary dcreening operation substratum, at 20-35 DEG C, cultivate 3-5 days, selects primary dcreening operation bacterial strain and this bacterial strain of purifying; Purifying bacterial strain is inoculated in fermention medium by the inoculum size of 5%, and enlarged culturing prepares seed liquor step by step, and incubation time is 72-96 hour; Seed liquor is inoculated in fermention medium by the inoculum size of fermentating liquid volume 5-10%, and cultivate 96-144 hour for 20-35 DEG C, namely Trichodermareesei fermentative production cellulase terminates; Fermented liquid is centrifugal at 4000-6000rpm, and collecting gained liquid is crude enzyme liquid; The crude enzyme liquid obtained carries out hyperconcentration filtration, obtains concentrated enzyme liquid.
Beneficial effect of the present invention is: the high and Li's Trichoderma strains of good stability of the strain cellulase-producing vigor that obtains, change the acidic cellulase that strain fermentation produces high vigor, its preparation method is simple, fermentation period is short, greatly can reduce the power consumption of industrial application, make its more environmental protection, there is wide prospects for commercial application.
Embodiment:
Bacterial classification primary dcreening operation: the soil sample screening and separating that original strain Trichodermareesei (Trichodema reesei) HYX01 picks up from Jinshi City guarantor river levee domestic fungus cultivating base goes out.Li's Trichoderma strains is inoculated on slant activation substratum, activated spawn; Cultivate the bacterial classification after activation, picking list bacterium colony prepares spore suspension, and uses uv irradiating spore suspension, and mutagenesis obtains spore bacterium colony; Spore concentration is adjusted to 103/mL by suitable dilution, and get last dilution bacterium liquid 0.2mL, dilution spread is on Mierocrystalline cellulose-Congo red plate screening substratum.The bacterial strain 200 that after cultivating 2 ~ 3 days at 30 DEG C, picking transparent circle/colony diameter is larger.(described Mierocrystalline cellulose-Congo red plate screening substratum is composed as follows: cellulose powder 10g, Congo red 0.2g, ammonium sulfate 5g, magnesium sulfate 0.25g, potassium primary phosphate 1g, sodium-chlor 0.1g, gelatin 2g, agar 20g, tap water constant volume 1000mL, pH value 5-6,121 DEG C of sterilizing 20min).
Multiple sieve: the 200 strain bacterium obtained are inoculated in slant medium with sterile toothpick respectively, and 30 DEG C are cultured to spore and are paved with inclined-plane.Respectively spore is equipped with 50mL and sieves again in the 250mL triangular flask of substratum ferment to be inoculated under aseptic washing, inoculum size 10%(v/v), 30 DEG C, 100r/min cultivates 96h, measures the cellulase activity of each bacterial strain respectively.(the described substratum of sieve is again composed as follows: cellulose powder 50g, ammonium sulfate 5g, magnesium sulfate 0.25g, potassium primary phosphate 1g, sodium-chlor 0.1g, tap water constant volume 1000mL, pH value 5-6,121 DEG C of sterilizing 20min).The bacterial strain choosing cellulose enzyme vigor the highest carries out amplification test.
Filtering out bacterial strain is again Trichodermareesei (Trichodema reesei) 601-17, and deposit number is CCTCC NO:M2013540.
Cultural characteristic: the optimal pH 3.0-6.0 of this bacterial strain cellulase-producing; Optimum temperuture is 23 ~ 35 DEG C.
Genetic stability is tested: gone down to posterity for continuous ten times on inclined-plane by this bacterial strain, and detects the fermentation situation after at every turn going down to posterity by the method that shaking flask is sieved again.Experiment finds, inclined-plane goes down to posterity for continuous ten times, and this bacterial classification proterties does not have considerable change, and property indices is all normal, illustrates that the genetic stability of this bacterial classification is stronger.
Scale-up
Seed culture: by bacterial strain the highest for cellulose enzyme vigor access 500mL triangular flask, seed culture medium loading amount 100 milliliters, 30 DEG C, 150rpm shaking table cultivation 72-96h., seed culture medium: cellulose powder 5%, ammonium sulfate 0.3%, magnesium sulfate 0.025%, potassium primary phosphate 0.1%, sodium-chlor 0.01%, all the other are water, pH value 5-6,121 DEG C of sterilizing 20min.
Seed tank culture: by seed liquor with 10%(v/v) inoculum size access be equipped with in the 10L fermentor tank of 7.5L fermention medium, control ph is constant is 5.0 ± 0.2, culture temperature 27 ± 0.1 DEG C, stirring velocity 300rpm, ventilation (v/v) 1:0.8-1.2, incubation time 104h, dissolved oxygen 20-30%.Described fermention medium preparation method is: cellulose powder 10%, ammonium sulfate 0.5%, magnesium sulfate 0.025%, potassium primary phosphate 0.1%, sodium-chlor 0.01%, all the other are water, pH value 5-6,121 DEG C of sterilizing 20min.
After fermentation ends, get fermented supernatant fluid (crude enzyme liquid) and carry out enzyme activity detection, after measured, circumscribed beta-glucanase, Endo-β-glucanase, beta-glucosidase and filter paper enzyme activity reach 680U/mL, 1389U/mL, 486U/mL and 792U/mL respectively.
Bacterial strain after Trichodermareesei (Trichodema reesei) mutagenesis used in the present invention can preserve 2 months in 4 DEG C of environment, in the Sorbitol Solution USP of 10-20%, can preserve for a long time at subzero 80 DEG C.
Slant medium: potato 20%, glucose 1%, agar 2%, all the other are water, pH nature, temperature 28 DEG C.
Claims (4)
1. a bacterial strain for cellulase-producing, is characterized in that, described bacterial strain is Trichodermareesei bacterial classification (Trichoderma reesei) 601-17, and deposit number is CCTCC NO:M2013540.
2. the bacterial strain of cellulase-producing according to claim 1, is characterized in that, described bacterial strain physiological and biochemical property is as follows: this bacterial strain is at PDA cultured on solid medium, the bacterium colony formed is flocculence, light green, and bacterium colony is flat, high 0.1-0.75mm, colony edge white, neatly; Fast growth, 48h colony diameter reaches 1.0-8.5mm, and 72h reaches 30-50mm; White mycelium, has barrier film, and mycelia wall is smooth, and diameter is at 2-5 micron; Conidiophore occurs, to life on side shoot from the short lateral branch of mycelia; Conidiospore stalk is in ampuliform, and uprightly, colourless, spore is spherical in shape, green, diameter 20-100 micron.
3. the bacterial strain of cellulase-producing according to claim 1 and 2, is characterized in that, the optimal pH 3.0-6.0 of described bacterial strain cellulase-producing, and optimum temperuture is 23-35 DEG C.
4. the bacterial strain of cellulase-producing according to claim 1 and 2, seed liquor is inoculated in fermention medium, 25 DEG C cultivate 104 hours, fermented liquid cellulase circumscribed beta-glucanase, Endo-β-glucanase, beta-glucosidase and filter paper enzyme activity reach 680U/mL, 1389U/mL, 486U/mL and 792U/mL respectively.
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| US14/578,408 US9605247B2 (en) | 2013-12-23 | 2014-12-20 | Strain and a method to produce cellulase and its use |
| US15/360,076 US10053680B2 (en) | 2013-12-23 | 2016-11-23 | Strain and a method to produce cellulase and its use |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104263658A (en) * | 2014-09-26 | 2015-01-07 | 中国科学院天津工业生物技术研究所 | Trichoderma reesei strain and application thereof |
| CN105802854B (en) * | 2014-12-30 | 2020-10-16 | 中国科学院分子植物科学卓越创新中心 | Cellulase high-yield strain and application thereof |
| CN105176833A (en) * | 2015-08-07 | 2015-12-23 | 山东大学 | Trichoderma strain capable of generating cellulase and application of trichoderma strain |
| CN107012102B (en) * | 2017-01-13 | 2020-06-30 | 东南大学 | Trichoderma reesei genetic engineering bacterium capable of producing cellulase at high yield under induction of soluble and non-soluble carbon sources, and construction method and application thereof |
| CN110317746B (en) * | 2019-05-31 | 2021-05-04 | 中国农业科学院兰州畜牧与兽药研究所 | Cellulose degrading bacterium CX10 from termite intestinal tract and application thereof |
| CN111876335A (en) * | 2020-07-31 | 2020-11-03 | 深圳市顺盛农业科技发展有限公司 | Fungus capable of degrading cellulose and separation method and application thereof |
| CN112920973B (en) * | 2021-03-22 | 2022-10-28 | 广西壮族自治区兽医研究所 | Bacillus subtilis GL-4 for producing cellulase and application thereof |
| CN114480137A (en) * | 2021-12-24 | 2022-05-13 | 鞍钢集团矿业有限公司 | Trichoderma reesei and method for degrading straw by same |
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| CN101250485A (en) * | 2008-04-16 | 2008-08-27 | 中国石油化工股份有限公司 | Trichoderma reesei cultivation method for improving yield of cellulase |
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| CN101250485A (en) * | 2008-04-16 | 2008-08-27 | 中国石油化工股份有限公司 | Trichoderma reesei cultivation method for improving yield of cellulase |
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