JP5053648B2 - 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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- JP5053648B2 JP5053648B2 JP2007006189A JP2007006189A JP5053648B2 JP 5053648 B2 JP5053648 B2 JP 5053648B2 JP 2007006189 A JP2007006189 A JP 2007006189A JP 2007006189 A JP2007006189 A JP 2007006189A JP 5053648 B2 JP5053648 B2 JP 5053648B2
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- Prior art keywords
- uricase
- strain
- brevibacterium
- enzyme
- culture
- Prior art date
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- 230000001766 physiological effect Effects 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 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
- 238000002360 preparation method Methods 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000001488 sodium phosphate Substances 0.000 description 1
- 229910000162 sodium phosphate Inorganic materials 0.000 description 1
- 235000011008 sodium phosphates Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000001384 succinic acid Substances 0.000 description 1
- 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
- 229960003495 thiamine Drugs 0.000 description 1
- 239000011721 thiamine Substances 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 1
- 239000012137 tryptone Substances 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
- 229940035893 uracil Drugs 0.000 description 1
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- Micro-Organisms Or Cultivation Processes Thereof (AREA)
- Enzymes And Modification Thereof (AREA)
Description
本発明のウリカーゼは、通常用いられる培養手段によってウリカーゼ産生菌から製造され得る。以下、一実施態様として、ブレビバクテリウム属に属する細菌を用いたウリカーゼの製造方法について述べる。
この際、過酸化水素量の測定方法としては、例えば下記(ア)〜(ウ)の方法がある:
(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)ブレビバクテリウム属(Brevibacterium sp.)U−344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(関東化学製)0.5%(w/v)、リン酸一カリウム(関東化学製)0.2%(w/v)、尿酸(和光純薬製)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、菌体を除去することによって、菌体外酵素液(総ウリカーゼ活性 0.7U)を得た。
ウリカーゼの活性の測定は、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、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)で得られた菌体外酵素液および菌体内酵素液を使用した。
Claims (3)
- ブレビバクテリウム(Brevibacterium)属に属し、菌体外ウリカーゼの生産能を有する微生物を表面活性剤の非存在下で培養する工程(1)と、
前記工程(1)で得られた培養液からウリカーゼを採取する工程(2)と、
を含み、
前記ブレビバクテリウム(Brevibacterium)属に属する微生物が、ブレビバクテリウム属(Brevibacterium sp.)U−344 FERM P−21097菌株である、ウリカーゼの製造方法。 - 前記ウリカーゼが、20分間50℃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。
- 菌体外ウリカーゼ生産能を有するブレビバクテリウム属(Brevibacterium sp.)U−344 FERM P−21097菌株。
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