JPWO2015156345A1 - 古細菌由来タンパク質の分泌生産システム - Google Patents
古細菌由来タンパク質の分泌生産システム Download PDFInfo
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Abstract
Description
項1.
タラロマイセス属菌を宿主として用いる古細菌由来タンパク質の分泌生産システム。
項2.
タラロマイセス属菌中で機能するプロモーター領域、
前記プロモーター領域の下流に存在する分泌シグナル領域、
前記分泌シグナル領域の下流に存在する古細菌由来タンパク質コード領域、及び
前記古細菌由来タンパク質コード領域の下流に存在するターミネーター領域、
を有する発現ベクターでタラロマイセス属菌が形質転換されている、項1に記載のシステム。
項3.
該分泌シグナル領域が、配列番号5で示される塩基配列を有する、項2に記載のシステム。
項4.
該プロモーター領域、及び、該ターミネーター領域が、各々タラロマイセス・セルロリティカス由来のグルコアミラーゼのプロモーター領域、及び、ターミネーター領域である、項2又は3に記載のシステム。
項5.
古細菌由来タンパク質コード領域が、そのコドン使用頻度がタラロマイセス属菌での発現に最適化されている、項2〜4のいずれかに記載のシステム
項6.
古細菌由来タンパク質が、パイロコッカス属由来のセルラーゼである、項1〜5のいずれかに記載のシステム。
項7.
古細菌由来タンパク質コード領域が、配列番号6又は7で示される塩基配列を有する、項2〜6のいずれかに記載のシステム。
項8.
項1〜7のいずれかに記載のシステムを用いて古細菌由来タンパク質を分泌生産する方法。
項9.
タラロマイセス属菌を培養する工程を含む、項8に記載の方法。
項10.
古細菌由来タンパク質を分泌生産するためのタラロマイセス属菌の使用。
タラロマイセス・セルロリティカス由来のセロビオハオドロラーゼの分泌シグナルペプチドをコードする塩基配列(配列番号5)の下流に、タラロマイセス属での発現用にコドン改変したパイロコッカス・ホリコシ由来の耐熱性エンド型セルラーゼをコードする塩基配列(配列番号6)が連結した塩基配列を有するポリヌクレオチド(以下、「配列H」と称する場合もある)を合成法により調製した。また、タラロマイセス・セルロリティカス由来のセロビオハイドロラーゼ分泌シグナルペプチドをコードする塩基配列(配列番号5)の下流に、タラロマイセス属での発現用にコドン改変したパイロコッカス・フリオサス由来の耐熱性エンド型セルラーゼをコードする塩基配列(配列番号7)が連結したポリヌクレオチド(以下、「配列F」と称する場合もある)を合成法により調製した。これら2種類のポリヌクレオチドをタラロマイセス・セルロリティカス由来のデンプン誘導性のグルコアミラーゼプロモーター及びグルコアミラーゼターミネーターを有するプラスミドベクター(Inoue et al., J. Ind. Microbiol. Biotechnol., 2013, 40: 823-830)に組み込んだ。このようにして、グルコアミラーゼプロモーターとグルコアミラーゼターミネーターとの間にH配列を有するプラスミドベクター(以下、「Hベクター」とも称する)、及び、グルコアミラーゼプロモーターとグルコアミラーゼターミネーターとの間にF配列を有するプラスミドベクター(以下、「Fベクター」とも称する)を作製した(図1)。図1に示す通り、各領域の連結部には適宜制限酵素認識サイト(ECORVサイト及びSbflサイト)が設けられている。
上記1.で作製した組み換えベクターを、それぞれ別個にタラロマイセス・セルロリティカスYP−4株に導入した。導入は、プロトプラストPEG法で行い、形質転換体をウラシル要求性選択培地を用いて選抜した。ウラシル要求性選択培地の組成は次の通りである:1質量% グルコース、1.0M スクロース、1.5質量% agar、0.04質量% KH2PO4(pH5.5)、0.01質量%塩化カリウム、0.01質量% MgSO4・7H2O、0.05質量% 塩化アンモニウム、及び0.5質量% Trace element。前記Trace elementは200mgのCuSO4・5H2O、200mgのMnCl2・5H2O、及び200mgのZnSO4・7H2Oを蒸留水に溶解し、100mlにフィルアップしたものである。得られた形質転換体のゲノムDNAへの目的遺伝子の挿入は、PCR法を用いて確認した。
各形質転換体を別個に液体培地10mLを含む100mL三角フラスコに植菌し、220rpmで4日間、pH4.0、28.5℃で培養した。培地組成は次の通りである:1質量% コーンスティープリカー、2質量% デンプン、0.5質量% (NH4)2SO4、2.4質量% KH2PO4、0.47質量% 酒石酸カリウム2水和物、0.12質量% MgSO4、0.1質量% Tween80、0.2質量% Urea、0.1質量% Trace element。得られた培養液を各々3500rpmで10分間遠心分離し、培養上清と細胞とに分離した。培養上清を70℃で15分間熱処理し、その後セルラーゼ活性を測定して、その存在を確認した。熱処理後の培養上清中に含まれるパイロコッカス・ホリコシ由来の耐熱性エンド型セルラーゼ、及び、パイロコッカス・フリオサス由来の耐熱性エンド型セルラーゼのタンパク量をBCA法を用いて測定したところ、発現量はBSA換算でいずれも100mg/L以上であった。
上記3.で得られた培養上清を70℃で15分間加熱処理し、夾雑蛋白質を分離した後、SDS-PAGEで分子量を測定した。パイロコッカス・ホリコシ由来の耐熱性エンド型セルラーゼ、及び、パイロコッカス・フリオサス由来の耐熱性エンド型セルラーゼの分子量は、各々約44kDa及び30kDaであり、目的酵素であることが確認された(図2)。
タラロマイセス属糸状菌で発現させたパイロコッカス・ホリコシ、及び、パイロコッカス・フリオサス由来耐熱性エンド型セルラーゼを精製し、50、60、70、及び80℃の反応温度でエンドグルカナーゼ活性を測定した。具体的には、CMCを1質量%含む20mM酢酸ナトリウム緩衝液1mlあたりに、3.0μgのパイロコッカス・ホリコシ由来の耐熱性エンド型セルラーゼ、又は1.5μgのパイロコッカス・フリオサス由来の耐熱性エンドグルカナーゼを添加し、各温度で1時間反応させ、生成した還元末端量をDNS法で測定して活性を求めた。その結果、野生型エンドグルカナーゼと同様に高い耐熱性を持つことを確認した。その結果、本酵素には耐熱性が確認された(図3及び4)。図3及び4において、横軸は測定温度を示し、縦軸は、50℃における活性を100%として他の温度における活性を相対的に示す。
Claims (10)
- タラロマイセス属菌を宿主として用いる古細菌由来タンパク質の分泌生産システム。
- タラロマイセス属菌中で機能するプロモーター領域、
前記プロモーター領域の下流に存在する分泌シグナル領域、
前記分泌シグナル領域の下流に存在する古細菌由来タンパク質コード領域、及び
前記古細菌由来タンパク質コード領域の下流に存在するターミネーター領域、
を有する発現ベクターでタラロマイセス属菌が形質転換されている、請求項1に記載のシステム。 - 該分泌シグナル領域が、配列番号5の塩基配列を有する、請求項2に記載のシステム。
- 該プロモーター領域、及び、該ターミネーター領域が、各々タラロマイセス・セルロリティカス由来のグルコアミラーゼのプロモーター領域、及び、ターミネーター領域である、請求項2又は3に記載のシステム。
- 古細菌由来タンパク質コード領域が、そのコドン使用頻度がタラロマイセス属菌での発現に最適化されている、請求項2〜4のいずれかに記載のシステム。
- 古細菌由来タンパク質が、パイロコッカス属由来のセルラーゼである、請求項1〜5のいずれかに記載のシステム。
- 古細菌由来タンパク質コード領域が、配列番号6又は7の塩基配列を有する、請求項2〜6のいずれかに記載のシステム。
- 請求項1〜7のいずれかに記載のシステムを用いて古細菌由来タンパク質を分泌生産する方法。
- タラロマイセス属真菌を培養する工程を含む、請求項8に記載の方法。
- 古細菌由来タンパク質を分泌生産するためのタラロマイセス属真菌の使用。
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WO2010124266A2 (en) * | 2009-04-24 | 2010-10-28 | The Regents Of The University Of California | Thermostable cellulases, and mutants thereof, capable of hydrolyzing cellulose in ionic liquid |
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WO2010006152A2 (en) * | 2008-07-09 | 2010-01-14 | The Board Of Regents For Oklahoma State University | Thermocellulases for lignocellulosic degradation |
WO2010124266A2 (en) * | 2009-04-24 | 2010-10-28 | The Regents Of The University Of California | Thermostable cellulases, and mutants thereof, capable of hydrolyzing cellulose in ionic liquid |
WO2014192647A1 (ja) * | 2013-05-27 | 2014-12-04 | 独立行政法人産業技術総合研究所 | 培養細胞および糖液の製造方法 |
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