KR20140119856A - A novel microorganism Rhodococcus pyridinovorans EDB2 degrading aromatic compounds - Google Patents

Abstract

In the present invention, an enrichment culture is used to separate a microorganism from mud, whose strain name is EDB-2 and has an excellent ability to decompose endosulfan and organic materials, and the microorganism is analyzed for physiology properties and biochemistry properties. The result of the analysis shows that the microorganism has a 99% similarity to Rhodococcus pvridinivorans. The EDB-2 is aerobic, positive to gram, a bar type and pink. The growth temperature range of the EDB-2 is relatively large, the growable temperature being 20-45°C, and the optimal temperature thereof is 20-42°C, The EDB-2 cannot hydrolyze casein and cellulose but can decompose DNA, agar, starch and tween, which means the ability of the EDB-2 to decompose lipid is excellent. Accordingly the invention can be expected to be used for purifying marine waste water contaminated by organic materials.

Description

A novel microorganism Rhodococcus pyridinovorans EDB2 degrading aromatic compounds from Rhodococcus sp.

The present invention relates to a novel Rhodococcus sp. Rhodococcus sp. Strain identified through enrichment culture in coastal tidal flats. (EDB2) is produced and cultivated in the breeding water of bioflaviculture farm. By decomposing the nutrient energy including the byproduct produced by the cultured organism by the identified microorganism, the decomposed byproduct is reused as nutrient And to a microbial agent for purification of water used in a biofloack system.

Aquaculture has become a major source of food for the aquaculture industry in response to the global food crisis. Recently, farms have a mass production basis for fish, and technologies for the circulation and drainage of the breeding water in the farm are being developed.

In the case of aquaculture, it is necessary to continuously return the number of breeding animals, and it is difficult to reuse the breeding water used for breeding of aquaculture because there is a mixture of organic matter and animal feed waste. The number of breeding fishes in the breeding process is continuously increased by supplying water and discharging new water to the aquaculture farms, which are composed of the marine aquaculture or the nogei. The nutrients such as nitrates and phosphates The water quality deteriorates due to the eutrophication caused by the influx of water.

It is accompanied by a great deal of cost to deal with it, and it is practically impossible to properly dispose of wastewater treatment facilities, and it is discharged into rivers and basins as it is, causing environmental pollution.

On the other hand, disposal of wastes into the ocean is not a desirable method, but the waste management law and the marine pollution prevention law have been limited and have been approved. In order to prevent unreasonable speculation, international cooperation such as the formulation of a treaty for the prevention of marine pollution has been actively pursued by the International Maritime Organization (IMO), and countermeasures against marine pollution have been established in each country. The International Convention on the Prevention of Marine Pollution by Species of Waste and Other Substances, concluded on November 3, 1972 and entered into force in August 1975, ) '(Aka the London Convention).

In accordance with the London Convention, the government has banned marine discharges from sewage sludge and livestock manure from January 2012, drinking water (food waste wastewater) from January 2013, manure, manure sludge, industrial wastewater and sewage sludge from 2014 Despite this, it is a reality that the local government has not established measures for this.

Therefore, it is possible to naturally decompose organic matter such as proteins, carbohydrates, lipids and the like existing in the breeding water by inoculation and cultivation of microorganisms by microorganisms without draining water containing the byproducts produced by the organisms, Biofloat cultivation methods are being developed that can produce eco-friendly aquatic organisms continuously to use as needed nutrients.

In other words, BioFloc Technology is a method of cultivating heterotrophic bacteria and aquaculture species together so that the heterotrophic bacterium can prevent organic byproducts (including nitrogen) algae, and other water-borne plants), the organic byproducts degraded by the heterotrophic bacteria are re-fed to the aquaculture species by filtration to purify the water. .

In order for such aquaculture technology to be effective, a microorganism culture technology capable of decomposing and regenerating the organic matter in the breeding water by the microorganisms capable of recycling the water polluted by the biological activity should be secured, and a new activity and function Securing microorganisms is an important factor for successfully achieving the bioflocculation method.

In the present invention, microorganisms (strain name EDB2), which is highly resistant to endosulfan and organic matter, are isolated from saline tolerance through concentration cultivation in coastal tidal flats and their characteristics are analyzed. Thus, a microorganism preparation suitable for purification of bio- ≪ / RTI >

Korean Patent Publication No. 10-03289130 relates to Rhodococcus koreensis DNP505, a new species in Rhodococcus capable of degrading 2,4-dinitrophenol, Dinitrophenol, which is a harmful substance to humans and other organisms, can be degraded. When applied to wastewater, sewage or soil contaminated with 2,4-dinitrophenol, the biodegradation process using microorganisms A composition for Rhodococcus coriensis DNP505 is disclosed, which is a new species of Rhodococcus that can be used to efficiently purify 2,4-dinitrophenol in pollutants. Korean Patent Publication No. 10-0676930 discloses a strain Rhodococcus sp. EH831 (KCCM-10657P) having a biodegradable ability of volatile organic compounds. It is a strain of bacteria which has a very low solubility and is difficult to biodegrade, Rhodococcus sp. EH831 (KCCM-10657P) strain capable of efficiently biodegrading hexane, and a method for purifying a contaminated gas containing a volatile organic compound using the same. Korean Patent Publication No. 10-03252520 discloses a novel microorganism capable of decomposing an aromatic compound, Rhodococcus pyridinovorans PDB9, a method for decomposing an aromatic compound using the same, and a method for decomposing aromatic compounds such as wastewater, sewage, Or soil treatment agent, which is a novel microorganism capable of decomposing aromatic compounds having a toxic effect on the human body and other organisms, and a method for decomposing pyridine having high toxicity among aromatics Which is used to purify wastewater, sewage or soil containing pyridine. Korean Patent Registration No. 10-04352310 discloses a Rhodococcus sp. YHLT-2 (KCTC 10203BP) strain which decomposes oil such as crude oil, diesel and gasoline in a very wide temperature range of 1 to 37 ° C, And a method for biological purification of soil and ground water contaminated with oil used. However, the strains of the Rhodococcus sp. Disclosed in the above prior arts have a great difference in that they are species derived from the land and are not identified based on coastal tidal flats resistant to salt as in the present invention.

The present invention relates to a microorganism capable of resolving endosulfan and synthetic wastewater (peptone and glucose ratio 8: 2), which is one of the major pollutants of the tidal flats, in order to prepare a biological environmental purification strategy for wastewater contaminated with organic materials containing salts. The present invention also provides a microbial preparation suitable for purifying water quality of a biofloat aquaculture system containing salt contaminated with organic matter using a cocus genus (EDB2) as a new strain identified and identified.

In order to isolate microorganisms using endosulfan as a carbon and energy source in coastal tidal flats, an inorganic nutrient medium of 25 ml BM medium containing endosulfur at a concentration of 10 ppm was prepared, and then 5% of a sea water sample or a coastal soil sample was inoculated at room temperature (10 to 20 ^° C). Using a single strain isolated from the enriched culture, the resolving power was analyzed by HPLC on a BM medium supplemented with 10 ppm of endosulfan as a single carbon source and an energy source, and a strain with excellent resolution was selected.

Six strains isolated from endosulfan concentrate culture were identified on the basis of 16S rRNA base sequences. As a result, five strains of six genera were identified as Echinicola vietnamensis ), Rhodococcus ( Rhodococcus pyridinivorans), to Lu Liao Mobilis (Ruegeria mobilis), Tala consumption gel mouse's Latino borane (Thalassobius gelatinovorus), Tala Sophie La Te PD pillars (Thalassospira tepidiphila), Tena Bar Coolum ahip Interceptors (Tenacibaculum It was investigated by aiptasiae).

As a result of endo-islet resolving ability of each of these microorganisms constituting the enriched culture liquid examined in the present invention, Rhodococcus sp. EDB2 was selected to analyze physiological, biochemical and genetic characteristics.

EDB2 was very well grown when the endosulfan degradation was measured in a solid medium and a liquid medium containing endosulfan as a single carbon source and an energy source. As a result of measuring the endo - orbital resolution by EDB2 by treating endosulfan at a concentration of 5 ppm for HPLC analysis, the endosulfan resolution was about 85% within 7 days after the incubation.

The new strain of Rhodococcus (EDB2) identified from the tidal flats having the function of purifying the wastewater flowing from the land is resistant to the water environment including salinity and has excellent ability to decompose organic matter. Therefore, Can decompose the byproducts produced by the bioproducts and can be reused as the nutrients necessary for the bioproduct again, so that it can be useful for the purification of the water quality of the Biofrocco aquaculture system which can be cultured without the watering of the water.

Fig. 1 shows the chemical structure of the endosulfan sheet and the domestic shipment amount.
FIG. 2 shows a process for separating endosulfan degrading microorganisms by concentrated culture.
Fig. 3 shows the 16S rDNA sequence of Rhodococcus pyridinovorans EDB2 strain isolated and isolated from the tidal flat.
Figure 4 shows the results of the systematic analysis of EDB2 by the 16S rRNA sequence.
Figure 5 shows the results of biochemical characterization of EDB2 by API 20E.
Fig. 6 shows the results of biochemical characterization of EDB2 by API 20 NE.
Figure 7 shows the results of biochemical characterization of EDB2 by API CHB / E.
Fig. 8 shows the results of biochemical characterization of EDB2 by API ZYM.
Figure 9 shows the results of pure culture of strain EDB-2, which can utilize Annotated sulphate in both solid and liquid media.
Fig. 10 shows the results of the endosulfan resolution test of the strain EDB2 by HPLC.
11 shows a production process of a microorganism preparation produced using a tidal-flat EDB2 strain.
Fig. 12 shows an example of a farm where a microbial agent prepared using a tidal-flat EDB2 strain is used.

The present invention relates to a salt tolerance selected from a strain of the deposit No. KACC91762P isolated and identified by inoculating a coastal tidal flats and seawater into an endosulfuric acid thickening culture and cultivating the concentrated culture and growing at a temperature of 25 to 42 DEG C and a pH of 5 to 10, , Carbohydrates, lipids, and surfactants, salinity tolerant Rhodococcus ( Rhodococcus spp. pvridinivorans ) EDB2 strain, and a method for purifying the water quality of the breeding water.

The Rhodococcus pvridinivorans EDB2 strain identified in the present invention is aerobic, gram-positive, rod-shaped, and pinkish. The growth temperature range was 20 ℃ ~ 45 ℃ and the optimal temperature was about 20 ℃ ~ 42 ℃. Although it has no casein and cellulose hydrolysis ability, it has decomposition ability of DNA, agar, starch and tween. Therefore, it shows excellent applicability to lipid - contaminated environmental purification.

Accordingly, the present inventors deposited the above-identified strain of the present invention to the National Institute of Agricultural Science and Technology (KACC) on Nov. 22, 2012 and received the deposit number KACC91762P.

Hereinafter, identification methods and biochemical characteristics of coastal mudflats derived from coastal mudflats having excellent organic matter-resolving power, such as endosulfan, will be described with reference to the following examples.

1. Identification of isolates from coastal tidal flats

1.1. Endorphin  And organic degradation strain isolation and culture conditions

In order to separate microorganisms using endosulfan as carbon and energy source, 25 ml of BM medium (10 ml of 1 M phosphate buffer, 0.25 g of MgSO ₄ .7H ₂ O, 0.02 g of CaCl ₂ .2H ₂ O, 0.02 g of FeSO ₄ · 7H ₂ O, 2.38 g of (NH ₄ ) ₂ SO ₄ , 30 g of sea salt, and 990 ml of distilled water) was prepared and then 5% of the seawater samples or the coastal soil samples were inoculated.

The concentrated culture was performed at room temperature (10 to 20 ^° C), and 1 ml of the culture medium was inoculated to the new medium three times at intervals of one week to continue the subculture (FIG. 2). In order to isolate the various endosulfan degrading microorganisms, a separate concentrated culture was carried out by the same method as described above five times using a new sample.

In the case of endosulfan, the culture was incubated for 7 days, and then 1 mL of the culture was inoculated into each new medium and the second and third culturing were repeated under the same conditions. The synthetic wastewater degrading ability was investigated for endosulfan degrading microorganisms, so no concentrated culture was carried out separately. The resolution of synthetic wastewater was tested by inoculating BM medium containing 10,000 ppm of synthetic wastewater to microorganisms degrading endosulfan.

Using a single strain isolated from the enriched culture, the resolving power was analyzed by HPLC on a BM medium supplemented with 10 ppm of endosulfan as a single carbon source and an energy source, and a strain with excellent resolution was selected.

1.2. Total genomic DNA  Separation and purification

Each strain was inoculated into 50 mL of LB medium, cultured at 30 ° C. at 180 rpm for 24 hours, and harvested by centrifugation (6,300 × g, 10 min, 4 ° C.). The recovered cultured cells were resuspended in 5 mL of TES buffer (0.1 M Tris-HCl (pH 7.0), 0.01 M EDTA, 1 M NaCl), 200 μl of lysozyme (10 mg / mL) Lt; / RTI >

Then, 100 μl of 10% SDS was added, and 50 μl of proteinase K (20 mg / ml) and 5 μl of RNase were added thereto to prevent physical DNA cleavage, followed by reaction at 37 ° C for 30 minutes.

Add 5 ml of TES buffer, add 10 ml of phenol, and mix well. The supernatant was removed from the supernatant, transferred to a new tube, treated twice with phenol / chloroform / isoamyl alcohol and once with chlorofrom. The supernatant was transferred to a new tube, and 1/10 volume of 3M sodium acetate (PH.54) and 2-3 volumes of 100% ethanol were added and left at room temperature for 30 minutes.

After the centrifugation, the supernatant was discarded, the salts were washed with 70% ethanol, and centrifuged again. The supernatant was discarded, ethanol was removed from the air, and the precipitate was dissolved in sterilized water to be used in the next experiment. After electrophoresis on 0.8% agarose gel, the DNA band was identified and quantified using a UV-spectrophotometer (F 800, Beckman Coulter, Fullerton, USA). For purification of total DNA, crude DNA was dissolved in 10 ml of cesium chloride solution, ethidium bromide was added, dialyzed against 102,200um membrane filter for 30 minutes, and the DNA solution was recovered and concentrated. Then, a sample for amplification or cloning of a specific gene Were used.

1.3. In the enrichment culture,  by Endorphin  Decomposition microorganism separation result

Six strains isolated from the endothelium-enriched culture were five genera and six species, Echinicola var. vietnamensis), Rhodococcus flute Dino's borane (Rhodococcus pyridinivorans), to Lu Liao Mobilis (Ruegeria mobilis), Tala consumption gel mouse's Latino borane (Thalassobius gelatinovorus), Tala Sophie La Te PD pillars (Thalassospira tepidiphila), Tena Bar Coolum ahip Interceptors (Tenacibaculum aiptasiae ) .

The strain EDA5 isolated in the present invention has a high possibility of being a new genus which has not yet been reported. The most highly related strain of the 16S RNA sequence is Echinicola vietnamensis KMM 6221 ^T showed only 92.2% homology (Table 1). Also, the strains EDA2 and EDSW1 are likely to be new species. In the present invention, the resolving power of the respective microorganisms constituting the concentrated culture solution was determined to be the highest in Rhodococcus sp. EDB2 was selected and its characteristics were analyzed.

Microorganisms isolated by endosulfan enrichment culture based on 16S rRNA base sequence Strain Closese Relatives Similarity (%) Diff / Total nt EDA2 Thalassobius gelatinovorus IAM 12617 ^T 96.9 42/1360 EDA3 Ruegeria mobilis NBRC 101030 ^T 98.8 16/1361 EDA5 Echinicola vietnamensis KMM 6221 ^T 92.2 110/1414 EDB2 Rhodococcus pyridinivorans PDB9 ^T 99.0 14/1428 EDSW1 Tenacibaculum aiptasiae a4 ^T 97.6 33/1394 EDSW2 Thalassospira tepidiphila 1-1B ^T 98.4 22/1380

1.4. 16S rRNA  Analysis of gene sequence and systematic relationship

Bacterial 16S rDNA sequencing was performed by culturing the isolates in liquid medium at 30 ° C for 2 days to 3 days. The chromosomal DNA extracted from the chromosomal DNA was used as a template for PCR reaction and the primers were Eub27F: 5 '-AGA GTT TGA TCC A set of TGG CTC AG- 3 'and Eub 1522R: 5' -AAG GAG GTG ATC CAR CCG CA- 3 'was used.

The PCR reaction was performed using GeneAmp PCR System 9700 (Applied Biosystems, CT). The reaction conditions were 95 ° C for 5 minutes, 1 minute at 95 ° C, 1 minute at 55 ° C, 1 minute at 72 ° C 30 times and finally at 72 ° C for 1 minute and then stored at 4 ° C. The amplified DNA was recovered by gel extraction kit (SolGent) after electrophoresis on 1.0% agarose gel. The recovered DNA is then ligation in pGEM-T easy vector (Promega, Madison, Wisconsin) E. coli JM109. The plasmid DNA of the transformed clones was isolated and DNA sequencing was performed bidirectionally using an ABI 377 automated sequencer (Applied Biosystem, Foster, USA) using a promoter primer or SP6 promoter primer.

The determined nucleotide sequence was analyzed using a database of Ribosomal Database Project-II (http://rdp.cme.msu.edu) GenBankhttp: //ncbi.nlm.nih.gov). The systematic relationship of the microorganisms determined by the nucleotide sequence was shown to be related to the 16S rNA nucleotide sequence of the type strain using EZtaxon.

1.5. Endorphin Decomposition strain EDB2 16S of rRNA  Gene analysis result

Figure 3 shows the 16S rDNA sequence of the isolated Rhodococcus pyridinovorans EDB2 strain. Figure 4 shows the results of the systematic analysis of EDB2 by the 16S rRNA sequence. In a molecular phylogenetic analysis based on the 16S rDNA sequence, the strain designated as strain EDB2 was phylogenetically identified as Rhodococcus . Rhodococcus (99.6%) and R. rhodochrous (98.5%) with biphenyl-resolving R. pyridinivorans . The strain EDB2 was named as R. pyridinivorans EDB2 (Fig. 3). R. pyridinivorans , which has the highest homology with strain EDB-2 R04 is known to decompose biphenyl, a highly toxic aromatic compound, and R. sp. WTZ-R2 has been shown to be highly capable of removing di (2-ethylhexyl) phthalate (DEHP).

Therefore, the strain R. pyridinivorans isolated in the present invention Since EDB2 is expected to be useful for removing various aromatic and aliphatic compounds that are pollution - resistant to tidal flats, the following characteristics were investigated for the removal of various aromatic and aliphatic compounds which are degradable tidal flats.

2. Identified in coastal tidal flats Scion  Growth Characteristics by Environmental Conditions

2.1. Strain Growth Test by Environmental Condition

In the present invention, the growth of the strain was examined by varying three environmental conditions such as temperature, pH, and salinity. In order to determine the optimum temperature range of the bacterial growth, the strain was inoculated in LB medium and cultured at 4 ° C, 20 ° C, 30 ° C, 37 ° C, 42 ° C and 45 ° C. The strain was inoculated in a liquid medium and cultured in a water bath.

The optimum salinity range of the bacterial growth was adjusted to 0%, 1%, 2%, 3%, 4%, 5%, 6%, and 7% in LB medium using sodium chloride and the optimum pH range Was used by adjusting the pH of the LB medium to pH 1 from pH 3 to pH 11 using NaOH and HCl. The growth of the strain was confirmed by incubation for 5 days at the optimum growth temperature of each strain after the strain inoculation.

end. EDB2 of Badge growth  Test result

In order to analyze the growth of the strain EDB2, five different media, marine agar (MA), Luria-Bertani (LB), nutrient agar (NA), R ₂ A and tryptic soy broth As a result of the analysis, it was found that all the tested medium grew well (Table 2).

Growth ability test of strain EDB-2 in various media Medium MA LB NA R ₂ A TSA EDB2 +++ +++ +++ +++ +++

I. Temperature is a strain EDB2 Effect on Growth

In order to investigate the temperature range in which EDB2 could grow, growth was examined at 4 ℃ to 45 ℃. The strain EDB2 was found to grow at 25 ° C to 42 ° C (Table 3).

Effect of temperature on growth of strain EDB-2 Temp  (° C) 4 10 25 30 37 42 45 EDB2 - - +++ +++ +++ +++ -

All. pH A strain EDB2 Effect on Growth

In order to investigate the pH range in which EDB2 could grow, the growth was examined at pH 4 to pH 11. The strain EDB2 was found to grow at pH 5 to pH 10 (Table 4).

Effect of temperature on growth of strain EDB-2 pH 4 5 6 7 8 9 10 11 EDB2 - +++ +++ +++ +++ +++ +++ -

la. Salty strain EDB2 Effect on Growth

Growth of EDB2 strain was observed in medium containing 0-12% Zobell sea salts in order to determine the range of salinity to which EDB2 strain could grow. The strain EDB2 grew without salinity, but did not grow at salinity of 10% or more (Table 5).

Effect of salinity on the growth of EDB-2 strain Salinity  (%) 0 One 2 3 4 5 6 7 EDB2 +++ +++ +++ +++ +++ +++ +++ +++

3. From the lobster  Sympathetic New caution  Physiological and biochemical characteristics

3.1. Morphological, physiological and biochemical characterization of bacteria

In order to examine the morphological and physiological characteristics of bacteria, strains were inoculated on LBSS solid medium supplemented with sea salts and cultured at 25 ℃. First, the shape, color, and size of single colonies formed by 5-7 days of culture were observed. The shape and size of the strain were observed using optical microscope and scanning electron microscope. In the electron microscopic observation, the cultured bacteria were fixed with 4% glutaraldehyde for 2 hours and then washed with 50 mM phosphate buffer (pH 7.2).

The cells were fixed in 2% osmium tetroxide solution for 1 hour and dehydrated with 40, 50, 60, 70, 80, 90, 100% ethanol and lyophilized. After that, gold coating was performed using an ion sputter and observed with an electron microscope. The motility of the strain was confirmed by semisolid medium containing 0.4% agar. Oxidase - related oxidase was analyzed by colony color change using Oxidase Reagent Kit (BioM ㅹ rieux). Catelase was determined to be bubbles by adding 3% and hydrogen peroxide to the cells.

The physiological and biochemical characteristics of other isolates were investigated by using various API kits (BioM ㅹ rieux) and using API 20E, APL 20NE, API 50CHB, and API ZYM kit simultaneously. At this time, the strain was cultured in LBSS solid medium at 25 ° C for 2 days to 3 days, and the grown cells were suspended in a sterilized 3% sea salt solution and performed according to the manufacturer's instructions.

Nitrate reduction, esterase (C4), esterase lipase (C8), leucine arylamidase, acid phosphatase, naphtol-AS-Bi-phosphohydrolase, glucose acidification, gelatin liquefaction, arginine dihydrolase, urease, β-glucosidase, β -galactosidase, alkaline phosphatase, lipase (C14), etc., and indole production. We also investigated the assimilation of carbon sources such as mannitol, gluconate, malate, citrate, glucose, arabinose, mammose, N-acetyl-glucosamine, maltose, caprate, adipate and phenyl-acetate.

FIG. 5 shows the results of biochemical characterization of EDB2 by API 20E, FIG. 6 shows the results of biochemical characterization of EDB2 by API 20 NE, and FIG. 7 shows the biochemical characteristics of EDB2 by API CHB / The results of the analysis are shown. Figure 8 also shows the results of biochemical characterization of EDB2 by API ZYM.

end. API  By 20 E EDB2  Biochemical characterization results

Biochemical characteristics of strain EDB2 were analyzed by using 20 substrates of API 20 E kit. As a result, strain EDB2 had urease and urea was used. The ability to produce acetoin by fermenting sugar through Voges-Proskauer test . No oxidation or fermentation reaction was observed when 9 substrates (amygdalin, arabinose, glucose, inositol, mannitol, melibiose, rhamnose, sorbitol, sucrose) ).

I. API  20 NE On by EDB2  Biochemical characterization results

The biochemical characteristics of strain EDB2 were analyzed by using 20 substrates of API 20 NE kit. As a result, strain EDB2 had nitrate reduction ability and showed β-galactosidase-positive reaction when PNPG was used as a substrate. Mannitol and malate were available (Fig. 6).

All. API CHB By / E EDB2  Biochemical characterization results

Biochemical properties of strain EDB2 were analyzed using 48 substrates of API CHB / E kit. As a result, strain EDB2 showed a positive reaction with sorbitol and esculin, and negative reaction with the other substrates (FIG. 7).

la. API ZYM On by EDB2  Biochemical characterization results

As a result of measuring the biochemical properties of the strain EDB2, 20 kinds of enzyme activities of the API ZYM kit were measured. As a result, the strain EDB2 has alkaline phosphatase, esterase lipase, leucine arylamidase, trypsin, acid phosphatase, α-glucosidase and β-glucosidase enzyme (Fig. 8).

4. Identification of the strain identified in coastal tidal flats Endorphin  Application as cleaning agent

Fig. 9 shows the results of pure culture of strain EDB2, which can be used in the solid and liquid media, and Fig. 10, the endohedral resolution test of the strain EDB2 by HPLC.

4.1. Polymerase chain reaction activity test

Cellulase, cellulase, amylase, protease, and protease related to degradation of these polymers were inoculated into the LB solid medium containing cellulose, starch, casein, and Tween 80 in order to test the resolution of the polymer organic materials. And lipase activity. The cellulolytic activity of the strain was determined after 30 days of incubation at 30 ° C for 3 days, followed by 30 minutes of staining with congo red, followed by discoloration with 1M NaCl for 5 minutes, and starch decomposition with iodine for 30 minutes followed by discoloration with 1M NaCl for 5 minutes As shown in Fig.

The casein and Tween 80 were cultured for 2 days and 3 days, respectively, and their resolution was confirmed by a transparent ring observed with naked eyes without performing any staining process. Alkaline protease activity was determined in 100 mM Tris-HCl buffer (pH 10.0) using Hammerstan casein (Merck) at a concentration of 0.5% (Joo et al., 2002). One Unit of Enzyme Activity is defined as the amount of enzyme that releases 1 g of tyrosine per minute at 50 캜 under standard assay conditions.

end. EDB2 Polymer organic matter resolution test

As a result of the organic degradation test with strain EDB2, the strain EDB2 was found to have excellent lipid and carbohydrate degrading ability and high activity against nucleic acid degrading enzyme (Table 6).

Degradation test of organic matter by polymer EDB-2 Salinity  (%) Starch
(One%) DNase CM /
Cellulose Casein
(One%) Tween 20 40 60 80 EDB2 +++ +++ - - + +++ +++ ++

I. Assessment of organoleptic resolution and pure microbial screening for pure cultured single microorganisms

Using a single strain isolated through concentration culture, the resolving ability was examined in a BM medium supplemented with 10 ppm of endosulfan as a single carbon source and an energy source. Among them, strains with excellent resolution were selected. EDB2 was very well grown in solid medium and liquid medium containing endosulfan as a single carbon source and energy source, and each strain isolated from the endosulfurization concentrate culture was very well grown. (Figs. 9 and 10).

For HPLC analysis, endosulfan was treated at 5 ppm concentration and EDB2 - induced endosulfan degradation was measured. It showed about 85% endosulfan resolution in 7 days after incubation. The isolate EDB2, which has the highest endosulfan resolution, was selected as the first test strain and used for identification of physiological, biochemical and genetic characteristics.

All. Application of a new strain to a tidal flat cleaning agent

As a result of 16S rRNA sequencing, EDB2 It was found to be a species contained in the genus Rhodococcus . As mentioned earlier, the genus Rhodococcus has excellent ability to remove degradable materials that can not be readily degraded by other organisms, and is considered one of the most promising groups for biologically treating polluted environment. There are a wide range of compounds, including aliphatic and aromatic hydrocarbons, oxides, and halogen compounds, which are degraded by Rhodococcus spp .

Most of these compounds are complex synthetic molecules that are degradable and toxic. They are listed in the US Environmental Protection Agency (EPA) First Pollutant List (USEPA, 1996) and the first list of hazardous substances in the Toxic Substance and Disease Registry (ATSDR, 1997) . The importance of Rhodococcus in environmental biotechnology has been highly emphasized and much discussion has been made about the role of Rhodococcus as a biocatalyst in the degradation of pollutants. Therefore, Rhodococcus is considered to be suitable for environmental restoration, and it is believed that the strains or enzymes produced by them can be utilized.

As a new strain identified from the tidal flats of the present invention, Rhodococcus pyridinivorans EDB2, Accession No .: KACC91762P) was inoculated into a liquid culture broth and incubated at 25 to 42 ° C for 1 to 2 days at pH 5 to pH 10. The resulting product was partially lyophilized and the remaining portion was aseptically Dried, and the resultant product obtained after the drying step was aseptically pulverized to prepare a powdery microbial agent. 11 shows a process for producing a microorganism preparation using a tidal flat EDB2 strain.

In the case of a liquid preparation, food coloring may be added as an excipient for color control, vitamin C may be added as an excipient for improving shelf life, and Tween 80 may be added as an excipient for activating the enzyme ability. In the case of a solid powder, rice bran, degreasing steel, molasses and the like are additionally added as an excipient for fermentation, and silicate or the like can be added as an excipient for improving shelf stability.

As a new strain isolated from the tidal flats in this way, Rhodococcus pyridinivorans ) EDB2, Accession No .: KACC91762P), it can be very useful for restoring coastal tidal flats contaminated with toxic substances such as endosulfan.

[Example]

Fig. 12 shows an example of a farm where a microbial agent prepared using Rhodococcus pyridinivorans EDB2 is used as a new strain identified. The facility of the general cage farm is able to reuse the bioflavon system by decomposing the organic matter in the breeding water by using the microorganism material without the number of the breeding which is discharged in the biofloat aquaculture system.

The microbial agent for treating saline-containing aquatic organic wastewater is Rhodococcus pyridinivorans ) EDB2 was inoculated into a liquid culture broth and cultured at 25 to 42 ° C for 1 to 2 days at pH 5 to pH 10. The resultant part of the culture was partially lyophilized and the remaining part was aseptically dried, The resultant product was aseptically pulverized to obtain a powdered microorganism preparation.

 Microbial preparations for biofloat culture system containing the identified EDB2 culture as an active ingredient were sprayed on the aquaculture tank and incubated for 1 to 3 days before culturing the aquaculture, , Carbohydrates, lipids, and surfactants were maintained at a certain level.

Since biofrost aquaculture system contains organic matter such as protein, carbohydrate, lipid and surfactant excreted by aquaculture organisms, the microorganism preparation prepared above is inoculated into a breeding water reservoir and aerated and incubated for 1-3 days The organic matter contained in the aquaculture is decomposed by the activity of the microorganisms cultivated in the breeding water reservoir, so that the cultivated organisms can be continuously cultivated in the purified water.

The novel strains of Rhodococcus sp. Derived from the tidal flats of the present invention have salinity tolerance and are excellent in the decomposition ability of proteins, carbohydrates, lipids and complex organic compounds contained in salty water-containing wastewater, aquaculture water and the like, Biodegradable, and can be usefully used to purify the environment efficiently without causing secondary environmental pollution.

Agricultural Biotechnology Research Institute KACC91762 20121122

<110> Chonnam National University <120> A novel microorganism Rhodococcus pyridinovorans EDB2 degrading          aromatic compounds <130> P1320130127004 <160> 1 <170> Kopatentin 2.0 <210> 1 <211> 1429 <212> RNA <213> Rhodococcus pyridinivorans EDB2 <400> 1 cggggggtgg cgcgtgctac catgcagtcg aacgatgaag cccagcttgc tgggtggatt 60 agtggcgaac gggtgagtaa cacgtgggtg atctgccctg cactctggga taagcctggg 120 aaactgggtc taataccgga tatgacctcg ggatgcatgt tctggggtgg aaagtttttc 180 ggtgcaggat gagcccgcgg cctatcagct tgttggtggg gtaatggcct accaaggcga 240 cgacgggtag ccggcctgag agggcgaccg gccacactgg gactgagaca cggcccagac 300 tcctacggga ggcagcagtg gggaatattg cacaatgggc gcaagcctga tgcagcgacg 360 ccgcgtgagg gatgacggcc ttcgggttgt aaacctcttt cacccatgac gaagcgcaag 420 tgacggtagt gggagaagaa gcaccggcca actacgtgcc agcagccgcg gtaatacgta 480 gggtgcgagc gttgtccgga attactgggc gtaaagagct cgtaggcggt ttgtcgcgtc 540 gtctgtgaaa tcccgcagct caactgcggg cttgcaggcg atacgggcag actcgagtac 600 tgcaggggag actggaattc ctggtgtagc ggtgaaatgc gcagatatca ggaggaacac 660 cggtggcgaa ggcgggtctc tgggcagtaa ctgacgctga ggagcgaaag cgtgggtagc 720 gaacaggatt agataccctg gtagtccacg ccgtaaacgg tgggcgctag gtgtgggttt 780 ccttccacgg gatccgtgcc gtagccaacg cattaagcgc cacgcctggg gagtacggcc 840 gcaaggctaa aactcaaagg aattgacggg ggcccgcaca agcggcggag catgtggatt 900 aattcgatgc aacgcgaaga accttacctg ggtttgacat gtaccggacg actgcagaga 960 tgtggtttcc cttgtgggcc ggtagacagg tggtgcatgg ctgtcgtcag ctcgtgtcgt 1020 gagatgttgg gttaagtccc gcaacgagcg caacccttgt cctgtgttgc cagcacgtga 1080 tggtggggac tcgcaggaga ctgccggggt caactcggag gaaggtgggg acgacgtcaa 1140 gtcatcatgc cccttatgtc cagggcttca cacatgctac aatggtcggt acagagggct 1200 gcgataccgt gaggtggagc gaatccctta aagccggtct cagttcggat cggggtctgc 1260 aactcgaccc cgtgaagtcg gagtcgctag taatcgcaga tcagcaacgc tgcggtgaat 1320 acgttcccgg gccttgtaca caccgcccgt cacgtcatga aagtcggtaa cacccgaagc 1380 cggtggccta accccttgtg ggagggagcc gtcgaatgtg atcgtaccc 1429

Claims (7)

Accession number KACC91762P identified in coastal tidal flats with salinity tolerance and organic decomposition capability Rhodococcus pyridinivorans ) microbial agent for water purification of biofloat aquaculture system containing EDB2 culture as an active ingredient.
Accession number KACC91762P identified in coastal tidal flats with salinity tolerance and organic decomposition capability Rhodococcus pyridinivorans ) EDB2 as an active ingredient is sprayed on the water of the bioflavon culture tank for cultivation of the bioflavon system for the purification of water of the bioflavon culture system to decompose the organic matter contained in the water for breeding A method for purifying water in a system.
Accession number KACC91762P identified in coastal tidal flats with salinity tolerance and organic decomposition capability Rhodococcus pyridinivorans ) EDB2 is inoculated into a culture broth and cultured at a temperature of 25 ° C to 42 ° C and a pH of 5 to 10, and a method for producing a microorganism preparation for water purification of a bioflav system.
The bioflavon form of the present invention is characterized in that an excipient for color control or an excipient for improving shelf stability or an excipient for activating enzyme activity is additionally added to a liquid preparation obtained by the production method of claim 3 A method for producing a microbial agent for water purification of a system.
A process for producing a microorganism preparation for water purification of a bioflavon system, which comprises aseptically drying the resultant product of claim 4.
[7] The method of claim 5, further comprising aseptically pulverizing the resultant product obtained after the drying step.
The method according to claim 6, wherein any one substance selected from the group consisting of an excipient for fermentation or an excipient for improving shelf life is additionally added to the pulverized microorganism preparation.

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