JP4842938B2 - アミノ酸挿入を含む遺伝子操作されたピロロキノリンキノン依存性グルコースデヒドロゲナーゼ - Google Patents
アミノ酸挿入を含む遺伝子操作されたピロロキノリンキノン依存性グルコースデヒドロゲナーゼ Download PDFInfo
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- 229940045042 ubiquinone q2 Drugs 0.000 description 1
- SOECUQMRSRVZQQ-UHFFFAOYSA-N ubiquinone-1 Chemical compound COC1=C(OC)C(=O)C(CC=C(C)C)=C(C)C1=O SOECUQMRSRVZQQ-UHFFFAOYSA-N 0.000 description 1
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Description
臨床的診断および糖尿病の管理において、血液グルコース濃度の決定は極めて重要である。世界的におよそ1億5000万の人々が慢性疾患の真性糖尿病に罹患しており、WHOによると数字は2025年までに2倍になり得る。糖尿病は容易に診断、治療されるが、首尾よい長期間の管理には迅速にかつ正確に血液グルコース濃度を知らせる低コストの診断手段が必要とされる。PQQ依存性グルコースデヒドロゲナーゼ(EC 1.1.99.17)は、グルコースがグルコノラクトンに酸化される反応を触媒する。結果的に、この種類の酵素は血糖の測定に用いられる。これらの手段の一つは、もともとアシネトバクター・カルコアセチカスに由来するピロロキノリンキノン含有酵素である可溶性グルコースデヒドロゲナーゼ(s-GlucDOR、EC 1.1.99.17)に基づく診断用ストリップ(strip)である。
本発明は、EC 1.1.99.17の可溶型形態のバリアントに関し、これはアシネトバクター・カルコアセチカス由来の既知のs-GDH野生型配列(配列番号:2)の428位および429位に対応するアミノ酸位置の間に、少なくとも一つのアミノ酸残基挿入を含み、任意に一つ以上のアミノ酸置換、好ましくは348位および428位での置換をさらに含む、PQQ依存性可溶性グルコースデヒドロゲナーゼ(s-GDH)としても公知である。
上述のように、グルコースデヒドロゲナーゼ活性を有する二つの完全に異なるキノプロテイン酵素型(膜結合型および可溶型)は、共にEC 1.1.99.17の下に分類される。これら二種類は、互いに関連がないように思われる。
交差反応性[%]=(選択された糖の活性/グルコースの活性)×100%
で計算される。
に従って計算される。
野生型Aカルコアセティカス可溶性PQQ依存性グルコースデヒドロゲナーゼの大腸菌でのクローニングおよび発現
S−GDH遺伝子を、標準的な手順に従ってアシネトバクターカルコアセティカスLMD 79.41株から単離した。野生型s−GDH遺伝子を、調節可能な発現のためのmglプロモーターを含むプラスミド(参考、特許出願WO88/09373)にサブクローニングした。新しい構築物をpACSGDHと呼んだ(図2および3を参照)。組換えプラスミドを大腸菌群から選択した宿主生物体に導入した。次いで、これらの生物体を適切な条件下で培養し、s−GDH活性を示すコロニーを選択した。
変異体T348Gの作製
挿入バリアントの産生のための重要な開始テンプレートとして、変異T348Gを有する変異体s−GDHを作製した。それがグルコースに比べてマルトースに対して減少した活性を有することが公知なので、このs−GDHの変異体を選択した(WO02/34919を参照)。
スクリーニング
上記される寒天プレート上の変異体コロニーを、拾って200μlのLB−アンピシリン培地/ウェルを含むマイクロタイタープレート(MTP)に入れ、37℃で一晩インキュベートした。これらのプレートをマスタープレートと呼ぶ。
部位特異的変異誘発からの変異体s−GDH遺伝子の配列決定
25〜30%のマルトース/グルコース交差反応性を有する変異体s−GDH T348Gに対する遺伝子を含むプラスミドを単離し(High Pure Plasmid Isolation Kit, Roche Diagnostics GmbH, No. 1754785)、ABI Prism Dye Terminator Sequencing KitならびにABI 3/73および3/77シーケンサー(Amersham Pharmacia Biotech)を使用して配列決定した。
センス鎖: GDH 1: 5´-TTA ACG TGC TGA ACA GCC GG-3´ (=配列番号5)
GDH 2: 5`-ATA TGG GTA AAG TAC TAC GC -3´ (=配列番号6)
DNAおよびアミノ酸レベルの所望される変異を達成し、348位でTからGへの交換を生じた(成熟酵素)。遺伝子上にさらなる変異を見出さなかった。
変異体T348Gを基本とした挿入バリアントの作製
挿入バリアントをQuickChange Site-Directed Mutagenesis Kit (Stratagene, Cat. 200518)を使用して作製した。アミノ酸428位と429位との間の挿入に対する適切なプライマー(配列番号2を参照)を設計し、s−GDHの変異体(変異体T348G、実施例4を参照)を用いたPCRを製造業者の記載に従って実施した。
センス鎖:
in429X_F: 5’- CTGCCGGAAATNNNGTCCAAAAAGATG -3’
(=配列番号7)
アンチセンス鎖:
in429X_R 5’- CATCTTTTTGGACNNNATTTCCGGCAG -3’
(=配列番号8)
(表1)
マルトースと比べた場合グルコースに対して高い基質特異性を有するさらなる挿入変異体の作製
WO02/34919において、例えばマルトースに比べてグルコースに対する基質特異性を上昇するために、s−GDHの異なる位置でのいくつかのアミノ酸交換を同定した。アミノ酸交換T348Gと、他の位置、例えば169位、171位、245位、341位および/または349位でのアミノ酸交換との組み合わせは、基質特異性をさらに上昇した。3、5および7%のマルトース/グルコースに対する基質特異性を有するそこに記載される変異体の2つを、それぞれ、428位と429位との間に本発明に従う挿入(この場合プロリン)受容するように選択した。配列番号9および10のプライマーを使用することによって挿入を達成した。
配列番号9 insP429_F:
5’-GATACTGCCGGAAATCCAGTCCAAAAAG -3’
配列番号10 insP429_R:
5’-CTTTTTGGACTGGTCCTCCGGCAGTATC -3’
野生型およびバリアントs−GDHそれぞれの精製およびその酵素活性の分析
増殖した細胞(LB−Amp 37℃)を回収し、リン酸カリウムバッファpH7.0に再懸濁した。細胞破砕をフレンチプレス通過(700〜900bar)によって実施した。遠心分離の後、上清を10mMリン酸カリウムバッファpH7.0で平衡化したS−セファロース(AmershamBiosciences)カラムにかけた。洗浄後、s−GDHを塩勾配0〜1MのNaClを使用して溶出した。s−GDH活性を示す画分をプールし、リン酸カリウムバッファpH7.0に対して透析し、再平衡化されたS−セファロースカラム上でリクロマトした。活性画分をプールし、Superdex(登録商標)200カラム(Amersham Biosciences)を使用してゲル濾過に供した。活性画分をプールし−20℃で保存した。
タンパク質決定を、Pierceから入手したプロテインアッセイ試薬番号23225 (BSAを用いた較正曲線、30分 37℃)を使用して実施した。
計算:活性=(全体積×dE/分[U/ml]):(ε×試料体積×1)
(ε=吸光計数;ε620nm=30[1×mmol−1×cm−1])
マルトースの存在下または非存在下でグルコースの決定
野生型s−GDHならびにs−GDHのバリアントC/1およびD/1はそれぞれ、マルトースの存在下または非存在下でのグルコースの決定に適用される。参照試料は、50mgグルコース/dlを含む。「試験」試料は、50mgグルコース/dlおよび100または200mg/dlマルトースをそれぞれ含む。同じ量のGDH活性(U/ml;上記酵素アッセイを参照)を各アッセイのために使用する。
1mlの0.315mg (4-(ジメチルホスフィニルメチル)-2-メチル-ピラゾロ-[1.5a]-イミダゾール-3-イル)-(4-ニトロソフェニル)-アミンml/0.2M クエン酸pH 5.8
0.033 mlの参照または試験試料
が混合される。
新規のバリアントを使用する場合、試験試料において明確により低いマルトースの干渉を検出する。試料中でマルトースからグルコースを最良に区別するためにs−GDHの濃度をさらに最適化し得ることは明らかである。多すぎる酵素がマルトース転化を増加し、少なすぎる酵素が全てのグルコースを転化せず、したがって、吸光の終点に達しない。
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Anthony, C., Adv. in Phot. and Resp. 15 (2004) 203-225
Ausubel, Fら、「Current protocols in molcular biology」(1994), Wiley Verlag
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Claims (6)
- PQQ依存性グルコースデヒドロゲナーゼの可溶性形態(s−GDH)のバリアントであって、A.カルコアセティカス由来のs−GDH野生型配列(配列番号:2)の428位に対応するアミノ酸位と429位に対応するアミノ酸位の間に1つのアミノ酸残基挿入を含み、該挿入されたアミノ酸が、フェニルアラニン、ロイシン、およびプロリンからなる群から選択され、該s−GDH野生型配列の348位に対応するアミノ酸位のトレオニンが、アラニン、グリシンおよびセリンからなる群より選択されるアミノ酸残基で置換された、バリアント。
- 1つ以上のさらなるアミノ酸置換をさらに含み、該バリアントのアミノ酸配列が、配列番号:2と少なくとも90%同一であり、該バリアントはs−GDH活性を示す、請求項1記載のバリアント。
- 請求項1または2記載のs−GDHバリアントをコードする、単離されたポリヌクレオチド。
- 宿主細胞においてポリヌクレオチドの発現を促進し得るプロモーター配列に作動可能に連結された請求項3記載の単離されたポリヌクレオチドを含む、発現ベクター。
- 請求項1または2記載のs−GDHバリアントを使用して試料中のグルコースを検出、決定または測定する方法であって、前記方法が、試料を前記バリアントと接触させる工程を含む、方法。
- 請求項1または2記載のs−GDHバリアントおよび測定に必要な他の試薬を含む、試料中のグルコースの検出または測定のためのストリップデバイス。
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PCT/EP2005/007844 WO2006008132A1 (en) | 2004-07-20 | 2005-07-19 | Genetically engineered pyrroloquinoline quinone dependent glucose dehydrogenase comprising an amino acid insertion |
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CN101421396B (zh) | 2006-04-13 | 2016-01-20 | 霍夫曼-拉罗奇有限公司 | 吡咯并喹啉醌依赖性可溶性葡萄糖脱氢酶的改良突变体 |
EP2329255A4 (en) | 2008-08-27 | 2014-04-09 | Edwards Lifesciences Corp | analyte |
FR2948680B1 (fr) | 2009-07-28 | 2013-10-04 | Centre Nat Rech Scient | Nouveaux mutants de la pqq s-gdh |
WO2011050340A1 (en) * | 2009-10-23 | 2011-04-28 | Life Technologies Corporation | Systems and methods for error correction in dna sequencing |
ES2568464T3 (es) | 2010-07-23 | 2016-04-29 | F. Hoffmann-La Roche Ag | Composiciones que contienen tampón zwiteriónico y usos en dispositivos y métodos electroanalíticos |
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US20130337485A1 (en) | 2010-12-20 | 2013-12-19 | Lek Pharmaceuticals D.D | Enzymatic synthesis of active pharmaceutical ingredient and intermediates thereof |
EP3901624B1 (en) | 2010-12-22 | 2024-01-31 | Roche Diabetes Care GmbH | Methods to compensate for sources of error during electrochemical testing |
CN111073866B (zh) | 2015-10-29 | 2024-03-19 | 英科隆生物技术(杭州)有限公司 | PQQ-sGDH突变体、聚核苷酸及其在葡萄糖检测中的应用 |
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JPH11243949A (ja) * | 1998-03-03 | 1999-09-14 | Toyobo Co Ltd | Pqqを補欠分子族とするグルコースデヒドロゲナーゼおよびその製造方法 |
WO2000066744A1 (fr) * | 1999-04-30 | 2000-11-09 | Koji Sode | Glucose-deshydrogenase |
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JPH11243949A (ja) * | 1998-03-03 | 1999-09-14 | Toyobo Co Ltd | Pqqを補欠分子族とするグルコースデヒドロゲナーゼおよびその製造方法 |
WO2000066744A1 (fr) * | 1999-04-30 | 2000-11-09 | Koji Sode | Glucose-deshydrogenase |
JP2004512047A (ja) * | 2000-10-27 | 2004-04-22 | エフ.ホフマン−ラ ロシュ アーゲー | 可溶性ピロロキノリンキノン−依存性グルコースデヒドロゲナーゼのバリアント |
EP1367120A2 (en) * | 2002-05-27 | 2003-12-03 | Toyo Boseki Kabushiki Kaisha | Modified pyrroloquinoline quinone (PQQ) dependent glucose dehydrogenase with superior substrate specificity and stability |
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EP1771553A1 (en) | 2007-04-11 |
HK1107829A1 (en) | 2008-04-18 |
CN100549167C (zh) | 2009-10-14 |
NZ551870A (en) | 2009-02-28 |
NO340499B1 (no) | 2017-05-02 |
JP2008506375A (ja) | 2008-03-06 |
CN1989241A (zh) | 2007-06-27 |
US20070243566A1 (en) | 2007-10-18 |
KR100879491B1 (ko) | 2009-01-20 |
WO2006008132A1 (en) | 2006-01-26 |
KR20070032794A (ko) | 2007-03-22 |
MX2007000560A (es) | 2007-03-07 |
ZA200700544B (en) | 2008-10-29 |
CA2570593C (en) | 2012-03-20 |
EP3521421A1 (en) | 2019-08-07 |
IL179750A (en) | 2015-11-30 |
BRPI0513691A (pt) | 2008-03-25 |
RU2336306C1 (ru) | 2008-10-20 |
IL179750A0 (en) | 2007-05-15 |
AU2005263591A1 (en) | 2006-01-26 |
CA2570593A1 (en) | 2006-01-26 |
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NO20070946L (no) | 2007-04-11 |
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