JP2014008025A - コレステロールエステラーゼを可溶化発現させる方法 - Google Patents
コレステロールエステラーゼを可溶化発現させる方法 Download PDFInfo
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- JP2014008025A JP2014008025A JP2012147578A JP2012147578A JP2014008025A JP 2014008025 A JP2014008025 A JP 2014008025A JP 2012147578 A JP2012147578 A JP 2012147578A JP 2012147578 A JP2012147578 A JP 2012147578A JP 2014008025 A JP2014008025 A JP 2014008025A
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Abstract
【解決手段】本発明は、可溶化コレステロールエステラーゼの製造方法であって、コレステロールエステラーゼをコードする遺伝子及びシャペロンをコードする遺伝子が導入された形質転換体を培養し、コレステロールエステラーゼを可溶化発現させることを含む、前記方法に関する。
【選択図】図1
Description
(2)コレステロールエステラーゼをコードする遺伝子がBurkholderia属微生物に由来する遺伝子である、(1)記載の方法。
(3)シャペロンをコードする遺伝子がLimS遺伝子である、(2)記載の方法。
(4)LimS遺伝子がBurkholderia属微生物に由来する遺伝子である、(3)記載の方法。
(5)形質転換体が大腸菌である、(1)〜(4)のいずれかに記載の方法。
(6)コレステロールエステラーゼをコードする遺伝子及びLimS遺伝子が導入された形質転換体。
(7)コレステロールエステラーゼをコードする遺伝子がBurkholderia属微生物に由来する遺伝子である、(6)記載の形質転換体。
(8)LimS遺伝子がBurkholderia属微生物に由来する遺伝子である、(7)記載の形質転換体。
(9)大腸菌である、(6)〜(8)のいずれかに記載の形質転換体。
(10)(6)〜(9)のいずれかに記載の形質転換体を培養することを含む、可溶化コレステロールエステラーゼの製造方法。
(11)コレステロールエステラーゼをコードする遺伝子及びLimS遺伝子を含む組換えベクター。
(12)コレステロールエステラーゼをコードする遺伝子がBurkholderia属微生物に由来する遺伝子である、(11)記載の組換えベクター。
(13)LimS遺伝子がBurkholderia属微生物に由来する遺伝子である、(12)記載の組換えベクター。
本発明では、Burkholderia属微生物、特に、Burkholderia cepaciaに由来するコレステロールエステラーゼ遺伝子が好ましい。
これらのシャペロン遺伝子は、単独で用いてもよいし、複数を組み合わせて用いてもよい。
まず、Burkholderia cepacia由来の可溶化CEを大腸菌で発現させるためにプラスミドを構築し、可溶化CE及びシャペロンの遺伝子配列を設計した。
形質転換体のバッチ培養によるBurkholderia cepacia由来の可溶化CEの生産を以下の方法で実施した。
プラスミドpTRP−SS−CE−LimSを形質転換した大腸菌JM109株について、50μg/mLのアンピシリンを含むLB培地25mLを用いて35℃、160rpmで9時間バッチ培養を行った。菌体の増殖は、培養液の600nmでの吸光度を測定して調べた。その結果、プラスミドpTRP−CE−LimSで形質転換した大腸菌JM109株のバッチ培養菌体を得ることができた。
大量精製を行うため、6Lの培養液から得られた湿菌体を10mM トリスバッファー(pH8.0、5mM 塩化カルシウム)に懸濁したのち、超音波破砕にて菌体破砕を行い、得られた破砕画分を遠心分離し(18,000×g、15分、4℃ BECKMAN社製 Model HP−26XP Centrifuge)粗抽出液を調製した。得られた粗抽出液を用いて以下の方法で精製を行った。
実施例3で得られた可溶化CEの酵素学的基礎性能を評価した。コレステロールエステラーゼ活性は、特に記載した条件以外は、実施例2と同様の方法で測定した。
以下のバッファーに酵素を添加し、37℃、14日後の残存活性を測定した。
pH5.5〜6.5:0.1M MESバッファー
pH6.5〜7.0:0.1M PIPESバッファー
pH7.0〜8.0:0.1M HEPESバッファー
pH8.5〜9.5:0.1M グリシン−NaOHバッファー
結果を図2に示す。各バッファーにおける0日の活性を100とし、相対活性として表した。
以下のバッファーを用い、コレステロールエステラーゼ活性を測定した。
pH5.5〜6.5:0.1M MESバッファー
pH6.5〜7.0:0.1M PIPESバッファー
pH7.0〜8.0:0.1M HEPESバッファー
pH8.5〜9.5:0.1M グリシン−NaOHバッファー
結果を図3に示す。0.1M MESバッファー(pH6.5)での活性を100とし、相対活性として表した。
4、25、30、37、40、45、50、55、60、60、70℃の温度で10分間インキュベートしたのち、コレステロールエステラーゼ活性を測定した。結果を図4に示す。4℃での活性を100とし、相対活性として表した。
25、30、37、40、45、50、55、60℃の温度でコレステロールエステラーゼ活性を測定した。結果を図5に示す。37℃での活性を100とし、相対活性として表した。
Claims (13)
- 可溶化コレステロールエステラーゼの製造方法であって、コレステロールエステラーゼをコードする遺伝子及びシャペロンをコードする遺伝子が導入された形質転換体を培養し、コレステロールエステラーゼを可溶化発現させることを含む、前記方法。
- コレステロールエステラーゼをコードする遺伝子がBurkholderia属微生物に由来する遺伝子である、請求項1記載の方法。
- シャペロンをコードする遺伝子がLimS遺伝子である、請求項2記載の方法。
- LimS遺伝子がBurkholderia属微生物に由来する遺伝子である、請求項3記載の方法。
- 形質転換体が大腸菌である、請求項1〜4のいずれか1項記載の方法。
- コレステロールエステラーゼをコードする遺伝子及びLimS遺伝子が導入された形質転換体。
- コレステロールエステラーゼをコードする遺伝子がBurkholderia属微生物に由来する遺伝子である、請求項6記載の形質転換体。
- LimS遺伝子がBurkholderia属微生物に由来する遺伝子である、請求項7記載の形質転換体。
- 大腸菌である、請求項6〜8のいずれか1項記載の形質転換体。
- 請求項6〜9のいずれか1項記載の形質転換体を培養することを含む、可溶化コレステロールエステラーゼの製造方法。
- コレステロールエステラーゼをコードする遺伝子及びLimS遺伝子を含む組換えベクター。
- コレステロールエステラーゼをコードする遺伝子がBurkholderia属微生物に由来する遺伝子である、請求項11記載の組換えベクター。
- LimS遺伝子がBurkholderia属微生物に由来する遺伝子である、請求項12記載の組換えベクター。
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