WO2013129179A1 - 酵素の保存方法 - Google Patents
酵素の保存方法 Download PDFInfo
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- WO2013129179A1 WO2013129179A1 PCT/JP2013/053955 JP2013053955W WO2013129179A1 WO 2013129179 A1 WO2013129179 A1 WO 2013129179A1 JP 2013053955 W JP2013053955 W JP 2013053955W WO 2013129179 A1 WO2013129179 A1 WO 2013129179A1
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- nitrile hydratase
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
- C12N1/06—Lysis of microorganisms
- C12N1/066—Lysis of microorganisms by physical methods
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
- C12N1/20—Bacteria; Culture media therefor
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- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/88—Lyases (4.)
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/96—Stabilising an enzyme by forming an adduct or a composition; Forming enzyme conjugates
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Y—ENZYMES
- C12Y402/00—Carbon-oxygen lyases (4.2)
- C12Y402/01—Hydro-lyases (4.2.1)
- C12Y402/01084—Nitrile hydratase (4.2.1.84)
Definitions
- the present invention relates to a method for preserving a microorganism enzyme having nitrile hydratase activity, a method for activating it, and a method for producing activated nitrile hydratase.
- Enzymes produced by microorganisms are used in many situations as catalysts for chemical conversion reactions.
- nitrile hydratase, nitrilase, etc. which have nitrile group hydration or hydrolytic ability, it becomes possible to produce amides, carboxylic acids, ⁇ -hydroxycarboxylic acids and the like important in the chemical industry at low cost.
- enzymes with optical specific hydration ability or optical specific hydrolytic ability it is possible to produce optically active carboxylic acids, amino acids, ⁇ -hydroxycarboxylic acids, etc. that are important as raw materials for pharmaceuticals and agricultural chemicals. become.
- Patent Document 1 a method of storing in an aqueous solution containing a high concentration of inorganic salts
- Patent Document 2 a method of storing by freezing
- Patent Document 3 a method of performing (Patent Document 3) and the like are known.
- Patent Document 4 for crushing bacterial cells, separating solids, and purifying bacterial enzymes.
- the known storage method as described above has a complicated process and is not economical. Furthermore, since the activity of the enzyme is reduced, it is still not a satisfactory method. For example, the method of using an aqueous solution containing a high concentration of inorganic salts described in Patent Document 1 needs to be washed in a later process, which may only affect the quality of the product. And the manufacturing process becomes complicated. Moreover, in the method of preserving by freezing described in Patent Document 2, the freezing and thawing operations are complicated, and the enzyme activity is lost or lowered with the operations. The method described in Patent Document 3 for storing by aeration and stirring under pH control requires acid / alkaline chemicals and equipment and power for aeration and agitation.
- Patent Document 4 describes a method of disrupting bacterial cells and centrifuging after acid / heat treatment, but there is room for improvement because the enzyme activity decreases with the progress of the process.
- An object of the present invention is to provide a method for preserving an enzyme of a microbial cell obtained by culturing at a lower cost and more easily than a conventional method.
- the present inventors have intensively studied to solve the above problems.
- microbial cells with nitrile hydratase activity can be stored cheaply and easily by crushing the cells after culturing under light shielding using a high-pressure homogenizer and blocking the light to store them.
- the enzyme activity was improved during storage. That is, the inventors have found that a method for preserving an enzyme of a microbial cell meeting the above-mentioned problems has been achieved, and the present invention has been completed. That is, the present invention relates to a method for storing an enzyme of a microbial cell obtained by culturing at a lower cost and more easily than conventional methods, and improving the enzyme activity during storage.
- the present invention relates to a method for storing an enzyme having nitrile hydratase activity, which comprises crushing a cell body of a microorganism having hydratase activity after light-shielded culture using a high-pressure homogenizer and storing it while blocking light.
- a more preferable method of the method of the present invention includes the following modes, that is, storing a crushed bacterial solution by a predetermined method; and using a predetermined microorganism having nitrile hydratase activity.
- Still other preferred embodiments include storing the crushed bacterial solution at 4 to 37 ° C .; storing the crushed bacterial solution for 4 to 24 hours; and using a microorganism belonging to the genus Rhodococcus or Pseudonocardia.
- the gist of the present invention is a nitrile hydratase activity characterized by further crushing a cell body of a microorganism having a nitrile hydratase activity after light-shielded culture using a high-pressure homogenizer, blocking the light and storing it. And a method for producing an activated nitrile hydratase.
- microbial cells cultured under light-shielding suspended in a dispersion medium are crushed using a high-pressure homogenizer, and stored while blocking light, without aeration or stirring, pH adjustment or Even without heat treatment, it is possible to maintain a state in which an enzyme activity such as nitrile hydratase is maintained without rot or deterioration of the enzyme, that is, preservation.
- an enzyme activity such as nitrile hydratase is maintained without rot or deterioration of the enzyme, that is, preservation.
- it is possible to improve enzyme activity during storage that is, the labor and cost required in the conventional storage method can be greatly reduced, and a method for storing a bacterial enzyme that can be industrially satisfied is provided.
- the microorganism having nitrile hydratase activity has the property of producing the target enzyme catalyst and accumulating it in the cell or secreting it outside the cell.
- These microorganisms include microorganisms isolated from nature and genetically modified microorganisms. Representative examples of such microorganisms include, for example, the genus Rhodococcus having the nitrile hydratase activity, the genus Gordona, the genus Pseudomonas, the genus Pseudonocardia, and the genus Geobacillus. The microorganism to which it belongs is mentioned.
- Rhodococcus which introduce
- industrially preferred are Rhodococcus, Pseudocardia, and recombinant Escherichia coli and recombinant Rhodococcus bacteria into which the nitrile hydratase gene of these microorganisms has been introduced.
- specific examples of microorganisms belonging to the genus Rhodococcus include Rhodococcus rhodochrous J-1 described in JP-B-6-55148 and Rhodococcus described in International Publication Pamphlet WO2005 / 054456.
- Rhodococcus rhodochrous J-1 strain under the accession number “FERM BP-1478”, was established on September 18, 1987 by the National Institute of Technology and Evaluation, Patent Biological Depositary Center (1-1, Higashi 1-1, Tsukuba City, Ibaraki Prefecture 305-8586) -1 central 6th (hereinafter the same in this specification).
- the NCIMB 41164 stock was deposited on March 5, 2003 at the National Collection of Industrial and Marine Bacteria (NCIMB) (NCIMB Ltd Ferguson Building Craibstone Estate Bucksburn Aberdeen AB21 9YA) under the accession number NCIMB41164.
- 1 type selected from the said microorganisms can be used individually or in combination of 2 or more types.
- the microorganism having nitrile hydratase activity may be cultured under normal conditions suitable for culturing microorganisms, except that the microorganism is cultured in the dark.
- Nitrile hydratase refers to an enzyme capable of hydrolyzing a nitrile compound to produce a corresponding amide compound.
- nucleic acids encoding nitrile hydratase and sequences thereof include those described in Patent Document 2. Such nucleic acids can be introduced and expressed in microbial cells by conventional molecular biology techniques (see Sambrook, Fritsch and Maniatis, "Molecular Cloning: A Laboratory for these molecular methods). Manual "2nd Edition (1989), Cold Harbor Laboratory Press).
- an enzyme obtained from a microorganism having natural nitrile hydratase activity can be used, and an enzyme obtained by expressing a nucleic acid encoding nitrile hydratase in a microorganism cell can also be used.
- 1 type selected from the said enzyme can be used individually or in combination of 2 or more types.
- “preservation” means storing crushed bacterial cells in a tank or container. At this time, stirring or aeration may be performed so that the concentration in the tank or the container is not biased. However, in the present invention, the agitation may be performed without agitation or aeration. In the present invention, “standing still” means storing the crushed cells in a tank or container without stirring or aeration. In the present invention, as a method for blocking light, the microbial cell crushed material may be stored in a sealed container in a light-shielding tank or dark room.
- the storage temperature varies depending on the microorganism producing the enzyme, the type of enzyme, and the like, but it is possible to set an appropriate storage temperature using the enzyme activation as an index.
- storage is usually possible at room temperature, but from the viewpoint of enzyme activation, it is preferably performed at 4 to 37 ° C., more preferably 4 to 25 ° C., and further preferably 4 to 15 ° C. If the storage temperature is lower than 4 ° C., not only the cell suspension may be solidified but also the cost for cooling may be increased. Moreover, when it exceeds 37 degreeC, there exists a possibility that nitrile hydratase activity may fall depending on a microbial cell enzyme.
- the storage period varies depending on the microorganism producing the enzyme, the type of enzyme, the storage temperature, and the like, but it is possible to set an appropriate storage period using the enzyme activation as an index.
- the storage period is usually 4 to 24 hours, but 6 to 24 hours is more preferable. If the storage period is shorter than 4 hours, the nitrile hydratase activity may not be sufficiently improved. On the other hand, if it is longer than 24 hours, depending on the temperature and bacterial enzyme, the bacterial cell suspension may rot and the nitrile hydratase activity may decrease.
- the enzyme activity is activated as compared with the case where the light is not shielded.
- the nitrile hydratase activity after storage exceeds 100% with respect to the nitrile hydratase activity before storage. Preferably, it is maintained at 103% or more, more preferably 110% or more, and further preferably 120%.
- Nitrile hydratase activity can be measured by any method known in the art. For example, the nitrile hydratase activity should be measured by comparing the reaction rate of acrylamide formation with respect to the substrate (for example, acrylonitrile) before and after storage. Is possible.
- the “dispersion medium” means a solution used for suspending microbial cells to be crushed.
- the type of the dispersion medium is arbitrary, and the liquid medium used at the time of culturing cells or the liquid medium used at the time of culturing may be replaced with an organic acid aqueous solution.
- the component of the organic acid aqueous solution is not particularly limited as long as it does not inhibit the enzyme activity.
- carboxylic acids such as acrylic acid, formic acid, acetic acid, propionic acid, butyric acid, and oxalic acid.
- acrylic acid is preferable in terms of maintaining the quality of acrylamide.
- the preparation of the microbial cell disruption solution of the present invention is preferably carried out on the microbial cells obtained by culturing before the chemical treatment (for example, glutaraldehyde treatment disclosed in JP-A-7-265091).
- a high-pressure homogenizer that crushes the cells while suspended in a dispersion medium can be used.
- the high-pressure type homogenizer includes a French press, a continuous pressure type, and the like, but a continuous pressure type capable of stably obtaining a microbial cell disruption solution in a large amount industrially is preferable.
- As a crushing method it is preferable to crush with a high-pressure homogenizer in a state suspended in a dispersion medium.
- the temperature at the time of crushing is preferably 0 ° C. to 37 ° C., more preferably 0 ° C. to 25 ° C. in order to avoid thermal denaturation.
- the pressure at the time of crushing is not particularly limited as long as it is a pressure capable of crushing bacterial cells, but it is preferably adjusted to 50 to 150 MPa, preferably 70 to 120 MPa.
- concentration of bacteria when crushing may be in the range of 0.1 to 30% by mass in terms of dry cells.
- the solid matter may be separated and used.
- separating a solid substance is not limited, For example, centrifugation etc. are mentioned.
- the temperature during the separation operation is preferably from 0 to 37 ° C, more preferably from 0 to 25 ° C.
- Example demonstrates the implementation method of this invention further in detail, these Examples aim at the illustration of this invention, and do not limit this invention.
- the enzyme activity was evaluated by storing the cultured cells in a predetermined method, and then centrifuging the supernatant after contacting the nitrile with the predetermined method described below. This was done by measuring the total reaction rate.
- % display is mass%.
- Rhodococcus bacterium transformant having nitrile hydratase gene As a transformant into which a nitrile hydratase gene derived from Rhodococcus rhodochrous J1 was introduced, Rhodococcus rhodochrous ATCC12674 / pSJ042 produced by the method described in JP-A-2008-154552 was used. For the transformant into which the nitrile hydratase gene derived from Pseudonocardia thermophila JCM3095 was introduced, the plasmid pSJ-N02A described in JP2011-200132A was introduced into the ATCC12674 strain in the same manner as described above. Rhodococcus rhodochrous ATCC12674 / pSJ-N02A was used.
- Dry cell concentration dry cell mass [%]
- the cell suspension is 120 ° C. From the mass ratio before and after drying for 3 hours using a dryer (percentage: percentage of dried residue of the bacterial solution [%]), the cell suspension is a liquid that does not substantially contain the microorganism cell layer This was determined by subtracting the mass ratio (percentage: supernatant salt concentration [%]) before and after drying when the liquid layer was similarly dried.
- nitrile hydratase activity was calculated from the reaction rate of acrylamide formation with the supernatant obtained by crushing the cells and separating the solid.
- the reaction was started by adding an aqueous solution of acrylonitrile as a substrate to the supernatant. After shaking at 10 ° C. for 10 minutes, the reaction was stopped by filtration separation of the bacterial cells and addition of phosphoric acid, and gas chromatography (GC-14B, Shimadzu Corporation).
- GC-14B gas chromatography
- a 1 m glass column packed with Porapak PS (Waters) was used, and a FID having a column temperature of 210 ° C. and a detector of 230 ° C. was used.
- the enzyme activity of nitrile hydratase in the present invention was measured as the amount ( ⁇ mol) of acrylamide produced by 1 mg of cells per minute.
- Example 1 The dry cell concentration of ATCC12674 / pSJ042 and ATCC12674 / pSJ-N02A obtained by culturing as described above was measured. Next, the microbial cells were crushed using the microbial cell suspension obtained by culturing in a small microbial cell pulverizer PANDA2K (manufactured by Niro Soavi), which is a high-pressure homogenizer. The crushing pressure was 100 MPa, and the temperature during crushing was 4 ° C. Immediately after preparing the crushing liquid (0 hour), and centrifuge the crushing liquid stored at 4 to 37 ° C in a dark place for 4 to 24 hours at 4 ° C and 15000 rpm for 5 minutes. To obtain a supernatant. As a result of measuring the nitrile hydratase activity of this supernatant, Table 4 shows the relative values when the activity at 0 hour is defined as 100.
- Example 2 The cultured cells were Rhodococcus rhodochrous J1, and the enzyme activity improving effect was determined in the same manner as in Example 1 except that 3L jar fermenter (manufactured by Takasugi Seisakusho) was used instead of the 500 ml Erlenmeyer flask. In addition, the dry cell density
- ⁇ Comparative example 2> The effect of improving enzyme activity was determined in the same manner as in Example 2 except that the storage temperature was 50 ° C. As a result, the relative values when the activity at 0 hour is defined as 100 are shown in Table 5.
- ⁇ Comparative Example 3> The effect of improving enzyme activity was determined in the same manner as in Example 2 except that the storage time was 48 hours. As a result, the relative values when the activity at 0 hour is defined as 100 are shown in Table 5.
- ⁇ Comparative Example 4> The effect of improving enzyme activity was determined in the same manner as in Example 2 except that an ultrasonic generator (manufactured by TAITEC, VP-300) was used as the crushing device.
- the enzyme activity is improved.
- the microorganism-derived enzyme used in the above Examples and Comparative Examples was used, the enzyme activation effect was not obtained at a storage temperature of 50 ° C. In addition, the enzyme activation effect was not obtained at a storage temperature of 30 to 37 ° C. and a storage period of 48 hours.
- an enzyme activation effect can be obtained by using a high-pressure homogenizer.
- Example 3 The cultured cells were Rhodococcus rhodochrous NCIMB41164, and the effect of improving the enzyme activity was determined in the same manner as in Example 1 except that a manual French press (Otake Seisakusho Model 5502), which is a high-pressure homogenizer, was used to disrupt the cells. did. In addition, the dry cell density
- ⁇ Comparative Example 6> The effect of improving enzyme activity was determined in the same manner as in Example 3 except that the storage temperature was 50 ° C. As a result, the relative values when the activity at 0 hour is defined as 100 are shown in Table-6.
- ⁇ Comparative Example 7> The effect of improving enzyme activity was determined in the same manner as in Example 3 except that the storage time was 48 hours. As a result, the relative values when the activity at 0 hour is defined as 100 are shown in Table-6.
- ⁇ Comparative Example 8> The effect of improving enzyme activity was determined in the same manner as in Example 3 except that an ultrasonic generator (manufactured by TAITEC, VP-300) was used as the crushing device.
- the enzyme activity is improved.
- the enzyme activation effect could not be obtained by disrupting the cells with an ultrasonic homogenizer. Further, the enzyme activation effect could not be obtained without shading during storage.
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Abstract
Description
本発明は、培養して得られた微生物菌体の酵素を、従来法と比較して安価・簡便に保存する方法を提供することを目的とする。
すなわち、本発明は、培養して得られた微生物菌体の酵素を、従来法と比較して安価・簡便に保存し、且つ保存中に酵素活性を向上させる方法に係わり、その要旨は、ニトリルヒドラターゼ活性を有する微生物の遮光下培養後の菌体を、高圧式ホモジナイザーを用いて破砕し、光を遮断して保存することを特徴とするニトリルヒドラターゼ活性を有する酵素の保存方法に存する。
本発明においては、上記微生物から選択される1種を単独で又は2種以上を組み合わせて用いることができる。
ニトリルヒドラターゼ活性を有する微生物の培養は、遮光下で培養をすること以外は、微生物の培養に適した通常の条件で、培養すればよい。
本発明において、保存は通常室温で可能であるが、酵素活性化の観点から好ましくは4~37℃、より好ましくは4~25℃、さらに好ましくは4~15℃で行われる。保存温度が4℃よりも低いと菌体懸濁液が凝固する可能性があるだけでなく、冷却のための費用が高くなる恐れがある。また、37℃よりも高くなると菌体酵素によってはニトリルヒドラターゼ活性が低下する恐れがある。
ニトリルヒドラターゼ活性は、当該技術分野で公知のいずれかの方法により測定できるが、例えば、保存開始前と保存後の基質(例えば、アクリロニトリル)に対するアクリルアミド生成反応速度を比較すること等により測定することが可能である。
以下の実施例及び比較例に於ける%表示は質量%である。
Rhodococcus rhodochrous J1由来のニトリルヒドラターゼ遺伝子を導入した形質転換体として、特開2008-154552号公報に記載の方法で作製されたRhodococcus rhodochrous ATCC12674/pSJ042を用いた。
Pseudonocardia thermophila JCM3095由来のニトリルヒドラターゼ遺伝子を導入した形質転換体には、特開2011-200132号公報に記載のプラスミドpSJ-N02Aを、記載の方法と同様にしてATCC12674株に導入した、形質転換体Rhodococcus rhodochrous ATCC12674/pSJ-N02Aを用いた。
(1)ATCC12674株形質転換体の培養
500mlの三角フラスコに表-1の成分を水道水に溶解して調製した培地(pH7.2)100mlを入れ、121℃、20分のオートクレーブにより滅菌した。この培地に、尿素0.1g/L、カナマイシン50mg/Lとなるよう添加し、ATCC12674/pSJ042またはATCC12674/pSJ-N02Aを接種し、遮光下で30℃、230rpmで72時間培養した。試験例で使用した培地成分を以下の表-1に示す。
(2)Rhodococcus rhodochrous J-1株の培養
3Lジャーファーメンター(高杉製作所製)に表-2の成分を水道水に溶解して調製した培地(pH7.0)2.5Lを入れ、121℃、20分のオートクレーブにより滅菌した。この培地に、(1)と同様の方法で培養したRhodococcus rhodochrous J-1を20mL接種し、光を遮断して42時間培養した。培養温度は35℃であった。試験例で使用した培地成分を以下の表-2に示す。
(3)Rhodococcus rhodochrous NCIMB-41164株の培養
500mlの三角フラスコに表-3の成分を水道水に溶解して調製した培地(pH7.2)100mlを入れ、121℃、20分のオートクレーブにより滅菌した。これに、尿素5.0g/Lとなるよう添加し、Rhodococcus rhodochrous NCIMB-41164を接種し、遮光下で30℃、230rpmで65時間培養した。試験例で使用した培地成分を以下の表-3に示す。
「乾燥菌体濃度(乾燥菌体質量[%])」とは、菌体懸濁液に含まれる菌体の乾燥質量の比率により表され、具体的には、菌体懸濁液を120℃の乾燥機で3時間乾燥させた時の乾燥前後の質量比(百分率:菌液乾燥残渣割合[%])から、菌体懸濁液を微生物菌体層と実質的に菌体を含まない液層に分離した際の該液層を同様に乾燥させた時の乾燥前後の質量比(百分率:上清塩濃度[%])を差引くことにより求めたものである。
ニトリルヒドラターゼ活性は、菌体を破砕して固形物を分離した上澄み液によるアクリルアミド生成反応速度から算出した。基質であるアクリロニトリルの水溶液を上澄み液に添加することで反応を開始し、10℃で10分間振盪した後、菌体の濾過分離とリン酸添加により反応を停止させ、ガスクロマトグラフィ(GC-14B、島津製作所)で分析した。分析条件は、Porapack PS(ウォーターズ社)を充填した1mガラスカラムを用い、カラム温度210℃、検出器は230℃のFIDを使用した。
本発明におけるニトリルヒドラターゼの酵素活性は、1分間に菌体1mgが生産するアクリルアミドの量(μmol)として測定した。
<実施例1>
前述の通り培養を行って得たATCC12674/pSJ042、およびATCC12674/pSJ-N02Aについて、乾燥菌体濃度を測定した。次に、高圧式ホモジナイザーである小型菌体破砕装置PANDA2K(Niro Soavi社製)にて、培養を行って得た菌体懸濁液を用いて、菌体を破砕した。破砕圧力は100MPa、破砕時の温度は4℃であった。
破砕液を調製した直後(0時間目)と、暗所にて4~37℃で静置することで4~24時間保存した破砕液を、4℃、15000rpmにて5分間、遠心分離を行って上澄み液を得た。この上澄み液のニトリルヒドラターゼ活性を測定した結果、0時間目の活性を100としたときの相対値を表-4に示す。
保存温度を50℃にした以外は実施例1と同様にし、酵素活性の向上効果を判定した。結果、0時間目の活性を100としたときの相対値を表-4に示す。
培養した菌体がRhodococcus rhodochrous J1であり、500mlの三角フラスコの代わりに3Lジャーファーメンター(高杉製作所製)を用いて培養した以外は実施例1と同様にし、酵素活性の向上効果を判定した。なお、培養後の乾燥菌体濃度は、39.8g/Lであった。結果、0時間目の活性を100としたときの相対値を表-5に示す。
保存温度を50℃にした以外は実施例2と同様にし、酵素活性の向上効果を判定した。結果、0時間目の活性を100としたときの相対値を表-5に示す。
<比較例3>
保存時間を48時間にした以外は実施例2と同様にし、酵素活性の向上効果を判定した。結果、0時間目の活性を100としたときの相対値を表-5に示す。
<比較例4>
破砕装置として超音波発生機(TAITEC製、VP-300)を使用した以外は実施例2と同様にし、酵素活性の向上効果を判定した。超音波破砕操作においては、15mlコニカルチューブ(CORNING製)に培養した菌体懸濁液を1ml採取し、氷冷しながら強度20%にて5分間適用した。結果、0時間目の活性を100としたときの相対値を表-5に示す。
<比較例5>
遮光操作を行わなかった以外は実施例2と同様にし、酵素活性の向上効果を判定した。結果、0時間目の活性を100としたときの相対値を表-5に示す。
培養した菌体がRhodococcus rhodochrous NCIMB41164であり、菌体の破砕に高圧式ホモジナイザーである手動式フレンチプレス(大岳製作所 5502型)を用いた以外は実施例1と同様にし、酵素活性の向上効果を判定した。なお、培養後の乾燥菌体濃度は、5.4g/Lであった。結果、0時間目の活性を100としたときの相対値を表-6に示す。
保存温度を50℃にした以外は実施例3と同様にし、酵素活性の向上効果を判定した。結果、0時間目の活性を100としたときの相対値を表-6に示す。
<比較例7>
保存時間を48時間にした以外は実施例3と同様にし、酵素活性の向上効果を判定した。結果、0時間目の活性を100としたときの相対値を表-6に示す。
<比較例8>
破砕装置として超音波発生機(TAITEC製、VP-300)を使用した以外は実施例3と同様にし、酵素活性の向上効果を判定した。超音波破砕操作においては、15mlコニカルチューブ(CORNING製)に培養した菌体懸濁液を1ml採取し、氷冷しながら強度20%にて5分間適用した。結果、0時間目の活性を100としたときの相対値を表-6に示す。
<比較例9>
遮光操作を行わなかった以外は実施例3と同様にし、酵素活性の向上効果を判定した。結果、0時間目の活性を100としたときの相対値を表-6に示す。
Claims (6)
- 以下の工程を含むニトリルヒドラターゼの保存方法。
(1)ニトリルヒドラターゼ活性を有する微生物を遮光下で培養する工程。
(2)培養した微生物菌体を高圧式ホモジナイザーを用いて破砕する工程。
(3)得られた菌体破砕物を遮光下で4~24時間、4~37℃で保存する工程。 - ニトリルヒドラターゼ活性を有する微生物が、Rhodococcus属又はPseudonocardia属に属する微生物であることを特徴とする請求項1に記載の方法。
- 以下の工程を含むニトリルヒドラターゼの活性化方法。
(1)ニトリルヒドラターゼ活性を有する微生物を遮光下で培養する工程。
(2)培養した微生物菌体を高圧式ホモジナイザーを用いて破砕する工程。
(3)得られた菌体破砕物を遮光下で4~24時間、4~37℃で保存する工程。 - ニトリルヒドラターゼ活性を有する微生物が、Rhodococcus属又はPseudonocardia属に属する微生物であることを特徴とする請求項3に記載の方法。
- 以下の工程を含む活性化ニトリルヒドラターゼの製造方法。
(1)ニトリルヒドラターゼ活性を有する微生物を遮光下で培養する工程。
(2)培養した微生物菌体を高圧式ホモジナイザーを用いて破砕する工程。
(3)得られた菌体破砕物を遮光下で4~24時間、4~37℃で保存する工程。 - ニトリルヒドラターゼ活性を有する微生物が、Rhodococcus属又はPseudonocardia属に属する微生物であることを特徴とする請求項5に記載の方法。
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CN109153966A (zh) * | 2016-05-18 | 2019-01-04 | 哥伦比亚有限责任公司 | 生产丙烯酰胺的生物技术方法及相关新菌株 |
JP2019176836A (ja) * | 2018-03-30 | 2019-10-17 | 三井化学株式会社 | ニトリルヒドラターゼを含む菌体処理物の製造方法及びアミド化合物の製造方法 |
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CN109153966A (zh) * | 2016-05-18 | 2019-01-04 | 哥伦比亚有限责任公司 | 生产丙烯酰胺的生物技术方法及相关新菌株 |
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JP2019176836A (ja) * | 2018-03-30 | 2019-10-17 | 三井化学株式会社 | ニトリルヒドラターゼを含む菌体処理物の製造方法及びアミド化合物の製造方法 |
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AU2013227585B2 (en) | 2016-02-25 |
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RU2597965C2 (ru) | 2016-09-20 |
CN104145017A (zh) | 2014-11-12 |
US9353348B2 (en) | 2016-05-31 |
BR112014020899A2 (ja) | 2018-05-02 |
KR20160112010A (ko) | 2016-09-27 |
KR20140121428A (ko) | 2014-10-15 |
CN104145017B (zh) | 2017-03-15 |
RU2014139012A (ru) | 2016-04-20 |
KR101736018B1 (ko) | 2017-05-15 |
EP2821483A1 (en) | 2015-01-07 |
AU2013227585A1 (en) | 2014-09-18 |
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