JP5010291B2 - 新規ウリカーゼの製造方法 - Google Patents
新規ウリカーゼの製造方法 Download PDFInfo
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- JP5010291B2 JP5010291B2 JP2007006190A JP2007006190A JP5010291B2 JP 5010291 B2 JP5010291 B2 JP 5010291B2 JP 2007006190 A JP2007006190 A JP 2007006190A JP 2007006190 A JP2007006190 A JP 2007006190A JP 5010291 B2 JP5010291 B2 JP 5010291B2
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- Prior art keywords
- uricase
- cellulosimicrobium
- strain
- culture
- uric acid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- IYDGMDWEHDFVQI-UHFFFAOYSA-N phosphoric acid;trioxotungsten Chemical compound O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.OP(O)(O)=O IYDGMDWEHDFVQI-UHFFFAOYSA-N 0.000 description 1
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- 235000011164 potassium chloride Nutrition 0.000 description 1
- GNSKLFRGEWLPPA-UHFFFAOYSA-M potassium dihydrogen phosphate Chemical compound [K+].OP(O)([O-])=O GNSKLFRGEWLPPA-UHFFFAOYSA-M 0.000 description 1
- 229910000160 potassium phosphate Inorganic materials 0.000 description 1
- 235000011009 potassium phosphates Nutrition 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
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- 229910000162 sodium phosphate Inorganic materials 0.000 description 1
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- KYMBYSLLVAOCFI-UHFFFAOYSA-N thiamine Chemical compound CC1=C(CCO)SCN1CC1=CN=C(C)N=C1N KYMBYSLLVAOCFI-UHFFFAOYSA-N 0.000 description 1
- 235000019157 thiamine Nutrition 0.000 description 1
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- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 1
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Images
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- Enzymes And Modification Thereof (AREA)
- Micro-Organisms Or Cultivation Processes Thereof (AREA)
Description
本発明のウリカーゼの製造方法は、セルロシミクロビウム(Cellulosimicrobium)属に属し、ウリカーゼの生産能を有する微生物を培養する工程(1)と、前記工程(1)で得られた培養物からウリカーゼを採取する工程(2)と、を含む。
(ア)過酸化水素を4−アミノアンチピリンとフエノールあるいはその誘導体とパーオキシダーゼの存在下で反応させて、過酸化水素量に比例して生成する色素を吸光度から定量する(酵素比色法中ウリカーゼ・パーオシダーゼ法)方法;
(イ)酸化水素とアルコールとをカタラーゼの存在下で反応させ、生じたアルデヒドをアセチルアセトン及びアンモニアと縮合させて生成する色素を吸光度から定量する(酵素比色法中ウリカーゼ・カタラーゼ法)方法;および
(ウ)上記(イ)のカタラーゼによる反応生成物のアルデヒドと還元型ニコチンアミドアデニンジヌクレオチド(NADH)とをアルコールデヒドロゲナーゼの存在下で反応させてNADを生成せしめ、その際、減少するNADHを定量する(紫外部吸収法)方法。
(1)セルロシミクロビウム・フンケイ(Cellulosimicrobium funkei) U-647株の培養
下記組成;トリプトン(BD(Becton,Dickinson and Company)社製)1%(w/v)、酵母エキス(BD(Becton,Dickinson and Company)社製)0.1%(w/v)、塩化ナトリウム(関東化学社製)0.5%(w/v)、リン酸一カリウム(関東化学社製)0.2%(w/v)、尿酸(和光純薬工業社製)0.2%(w/v)からなる培養液を調製した後、pHをNaOHで7.0に調整し、121℃で20分間滅菌した。
上記(1)で得られた培養液を遠心分離し、得た菌体に、5mLのリン酸緩衝液(10mM、pH7)および3gのガラスビーズを加えて混合し、3分間振盪して、菌体を物理的に破砕した。この菌体破砕物を遠心分離により上清を回収し、この上清を酵素液(総ウリカーゼ活性 1.7U)とした。
ウリカーゼ活性の測定は、ウリカーゼ・ペルオキシダーゼ法を用い、550nmにおける4−アミノアンチピリンとTODB(N,N−ビス(4−スルホブチル)−3−メチルアニリン)の酸化縮合体のキノン色素を分光光度計により行なった。より具体的には、0.83mM 尿酸溶液 120μl、75mM TODB 5μl、75mM 4−アミノアンチピリン 5μl、80U/ml ペルオシキダーゼ 5μl、および酵素液 65μlを混合し、室温(25℃)で1時間反応させた後、550nmの吸光度を測定した。この際、ウリカーゼの単位は、上記試験条件下において毎分1マイクロモルの尿酸を分解する酵素の量(力価)を、「1U(ユニット)」と定義した。
標品としては、上記実施例1(2)で得られた酵素液を使用した。
Claims (4)
- セルロシミクロビウム(Cellulosimicrobium)属に属し、ウリカーゼの生産能を有する微生物を培養する工程(1)と、
前記工程(1)で得られた培養物からウリカーゼを採取する工程(2)と、
を含む、ウリカーゼの製造方法。 - 前記ウリカーゼが、20分間60℃の熱処理に対して95%以上の酵素活性を維持する、請求項1に記載の製造方法。
- 前記セルロシミクロビウム(Cellulosimicrobium)属に属する微生物が、セルロシミクロビウム・フンケイ(Cellulosimicrobium funkei)U−647 FERM−P21098菌株である、請求項1または2に記載の製造方法。
- ウリカーゼ生産能を有するセルロシミクロビウム・フンケイ(Cellulosimicrobium funkei)U−647 FERM−P21098菌株。
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