JP5479895B2 - Dnaポリメラーゼの保存及び使用のための両性イオン洗剤 - Google Patents
Dnaポリメラーゼの保存及び使用のための両性イオン洗剤 Download PDFInfo
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- JP5479895B2 JP5479895B2 JP2009521833A JP2009521833A JP5479895B2 JP 5479895 B2 JP5479895 B2 JP 5479895B2 JP 2009521833 A JP2009521833 A JP 2009521833A JP 2009521833 A JP2009521833 A JP 2009521833A JP 5479895 B2 JP5479895 B2 JP 5479895B2
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Description
一態様において、本発明は、ポリメラーゼ及び両性イオン洗剤又は非洗浄性界面活性剤を有する保存組成物及び反応組成物に関する。一般的に、反応混合物は、核酸合成反応を行うのに必要な成分を全て含む。保存混合物は、核酸合成反応を行うのに必要な成分を全て含んでも、又は含んでいなくてもよい。
両性イオン洗剤/非洗浄性界面活性剤を核酸ポリメラーゼと組合せて使用する。本明細書で使用されるように、「核酸ポリメラーゼ」又は「ポリメラーゼ」は、ヌクレオチドの重合を触媒する酵素を表す。一般的に、酵素は、核酸鋳型(テンプレート)配列とアニーリングするプライマーの3’末端で合成を開始させ、鋳型に沿って5’方向へと進む。「DNAポリメラーゼ」は、デオキシヌクレオチドの重合を触媒する。既知のDNAポリメラーゼとしては、例えば、パイロコッカス・フリオサス(Pyrococcus furiosus)(Pfu)DNAポリメラーゼ、大腸菌DNAポリメラーゼI、T7 DNAポリメラーゼ、サーマス・サーモフィルス(Thermus thermophilus)(Tth)DNAポリメラーゼ、バチルス・ステアロサーモフィルス(Bacillus stearothermophilus)DNAポリメラーゼ、サーモコッカス・リトラリス(Thermococcus litoralis)(Tli)DNAポリメラーゼ(Vent DNAポリメラーゼとも称される)、サーモトガ・マリティマ(Thermotoga maritima)(UlTma)DNAポリメラーゼ、サーマス・アクアティカス(Thermus aquaticus)(Taq)DNAポリメラーゼ、及びパイロコッカスGB−D(PGB−D)DNAポリメラーゼが挙げられる。
本明細書に記載される両性イオン洗剤/非洗浄性界面活性剤及びポリメラーゼ組成物は、ポリメラーゼが使用されることが既知のいずれの用途(例えば核酸増幅、PCR、QPCR、シークエンシング突然変異生成)で使用してもよい。
本発明は検出用ラベルを含むことが多くなることを意図する。検出用ラベルは、プローブと操作可能に連結するか(例えば、FAM及びBHQ2)、溶液中に遊離状態で与えられるか(例えば、蛍光DNA結合色素、SYBRグリーン)、又はヌクレオチド前駆体と操作可能に連結してもよい。
本発明は、本明細書に記載されるように、両性イオン洗剤/非洗浄性界面活性剤及びポリメラーゼを有する、新規の組成物及び方法を提供することを目的としている。本明細書中で本発明は、対象の組成物の1つ又は複数のコンテナ、及び幾つかの実施形態ではポリヌクレオチド合成(PCR、シークエンシング及び突然変異生成における合成を含む)に使用される様々な試薬のコンテナを有するパッケージ単位を含むキットフォーマットも意図する。キットは、以下の要素:ポリヌクレオチド前駆体(例えば、ヌクレオシドトリホスフェート)、プライマー、プローブ、緩衝液、取扱説明書、標識ヌクレオチド、挿入色素及び対照の1つ又は複数を含有してもよい。キットは、本発明による方法を行うのに好適な割合で共に混合した試薬のコンテナを含んでいてもよい。試薬コンテナは、本方法を行う際に測定工程が省かれる単位量で試薬を含有することが好ましい。本発明による1つのキットは、染色ゲルからのPCR産物収量の定量のために、DNA収量標準も含有する。一実施形態ではキットは、熱安定性ポリメラーゼ、両性イオン界面活性剤又は非洗浄性界面活性剤、及びポリヌクレオチド前駆体を含むマスターミックス試薬を含む。
非イオン性洗剤を最終保存緩衝液から除いたこと以外は標準的な製造プロトコルを使用して(洗剤非存在)、Pfu(exo+及びexo−)融合DNAポリメラーゼ(例えば、2005年7月15日に出願された米国特許出願第60/699,937号(その全体が参照により本明細書中に援用される)に記載されるような)、cPfu DNAポリメラーゼ(Stratageneのカタログ番号600154)、及びPEFを精製した。酵素は、50mMのトリスHCl(pH8.2)、0.1mMのEDTA、1mMのDTT、及び50%グリセロール中で−20℃で保存した。さらに、0.05%〜0.5%の範囲の割合(v/v)で、1つ又は複数の両性イオン洗剤をDNAポリメラーゼ保存緩衝液に追加した。
0.9kb及び6kbのシステムに関して、1×cPfu DF緩衝液中でcPfu DNAポリメラーゼ40ng、又は1×Pfu融合DF緩衝液I若しくはDF緩衝液IIそれぞれの中でPfu融合DNAポリメラーゼ28ng又は224ngを使用して、PCR反応(50μl)を行った。PCR反応物は、2U/50μlのパイロコッカス・フリオサスdUTPアーゼ(PEF)、ヒトゲノムDNA 100ng、それぞれ250μMのdNTP、及び各プライマー100ngも含有していた。9kbのシステムに関して、PCR反応物(50μl)は、Pfu 80ng、1.5×cPfu DF緩衝液、2Uのパイロコッカス・フリオサスdUTPアーゼ(PEF)、ヒトゲノムDNA 200ng、それぞれ500μMのdNTP、及び各プライマー200ngから成っていた。0.1% Triton X100又は両性イオン洗剤(複数可)をPCR反応緩衝液に追加した。反応サイクルは、以下に記載されるようなものであった。
両性イオン洗剤の安定化効果を示すのに、加速安定性試験を行った。洗剤非存在下で、Pfu融合DNAポリメラーゼを精製した後、洗剤を欠いた保存緩衝液、又は従来の非イオン性洗剤(0.1% Igepal/0.1% Triton X100)若しくは様々な両性イオン洗剤を含有する保存緩衝液中で28ng/μlに希釈した。−20℃で、タンパク質サンプルを保存するか、又は様々な時間95℃で加熱した。0.1% Triton X100(A)、又は0.1% CHAPSO/0.1% Anzergent 3−12のいずれかを追加した融合DF緩衝液中でPCRにおいて0.9kbのゲノム標的を増幅することによって、残存活性を評価した。
QPCR反応物は、DNA又はcDNA鋳型、様々な量のプライマー(以下の表2を参照されたい)、それぞれ300μMのdNTP、4ng/μlのexo−Pfu融合DNAポリメラーゼ、6ng/μlのホットスタートIgG、0.4ng/μlの一本鎖DNA結合タンパク質、1×Pfu融合DF緩衝液II(pH9)、4% DMSO、及び8%グリセロールを含んでいた。0.1% Triton X100又は両性イオン洗剤、及び0.5×SYBRグリーン(Molecular ProbesのS−7567)をQPCR反応物に追加した。反応サイクルは、以下の条件を使用したMX3000PリアルタイムPCRシステムで行った:(1サイクル)95℃ 5分;(40サイクル)95℃ 10秒、60℃ 30秒。
図9で示される結果は、Surfynol 465が、Pfu融合(パネルA)及び非融合(パネルB)DNAポリメラーゼ活性を増強及び/又は安定化させることを示す。実施例2で示された条件を用いて、PCRを行った。0.05%〜2.5% Surfynol 465をPCR反応緩衝液に追加した場合、非イオン性洗剤非存在下で行った増幅によって、高い産物収量が得られた。この収量は、0.1% Triton X100をさらに追加した洗剤無含有PCR緩衝液を使用して得た収量と同程度であった。
Claims (6)
- 精製ポリメラーゼ、及び両性イオン洗剤を含み、前記両性イオン洗剤が、CHAPSO(登録商標)、n−デシル−N,N−ジメチル−3−アンモニオ−1−プロパンスルフェート(Anzergent(登録商標)/Zwittergent(登録商標) 3−10)、もしくはn−ドデシル−N,N−ジメチル−3−アンモニオ−1−プロパンスルホネート(Anzergent(登録商標)/Zwittergent(登録商標) 3−12)、又はそれらの組み合わせであり、非洗浄性界面活性剤をさらに含み、前記非洗浄性界面活性剤が、Surfynol(登録商標) 104、Surfynol(登録商標) 420、Surfynol(登録商標) 440、Surfynol(登録商標) 465、Surfynol(登録商標) 485、Surfynol(登録商標) 504、Surfynol(登録商標) PSAシリーズ、Surfynol(登録商標) SEシリーズ、Dynol(登録商標) 604、Surfynol(登録商標) DFシリーズ、Surfynol(登録商標) CTシリーズ、Surfynol(登録商標) EPシリーズ、及びSurfynol(登録商標) 2502から成る群から選択される、ポリメラーゼの保存又は核酸増幅反応用の組成物。
- 検出用ラベルをさらに含む、請求項1に記載の組成物。
- 前記ポリメラーゼが熱安定性である、請求項1または2に記載の組成物。
- 前記熱安定性ポリメラーゼが熱安定性DNAポリメラーゼ融合タンパク質である、請求項3に記載の組成物。
- 請求項1から4のいずれか一項に記載の組成物と、そのためのパッケージング材料とを含むキット。
- 標的核酸を検出する方法であって、
精製ポリメラーゼ、プライマー、両性イオン洗剤、ヌクレオシド−5’−トリホスフェート、及び検出用ラベルを含む反応混合物を形成すること、
前記反応混合物を、前記標的核酸を増幅する核酸増幅反応条件に曝すこと、及び
前記サンプル中の前記標的の存在及び/又は量の指標となる前記検出用ラベルから生じたシグナルを検出することを含み、
前記両性イオン洗剤が、CHAPSO(登録商標)、n−デシル−N,N−ジメチル−3−アンモニオ−1−プロパンスルフェート(Anzergent(登録商標)/Zwittergent(登録商標) 3−10)、もしくはn−ドデシル−N,N−ジメチル−3−アンモニオ−1−プロパンスルホネート(Anzergent(登録商標)/Zwittergent(登録商標) 3−12)、又はそれらの組み合わせであり、
前記反応混合物が、Surfynol(登録商標)104、Surfynol(登録商標) 420、Surfynol(登録商標) 440、Surfynol(登録商標) 465、Surfynol(登録商標)485、Surfynol(登録商標) 504、Surfynol(登録商標) PSAシリーズ、Surfynol(登録商標)SEシリーズ、Dynol(登録商標) 604、Surfynol(登録商標) DFシリーズ、Surfynol(登録商標)CTシリーズ、Surfynol(登録商標) EPシリーズ、及びSurfynol(登録商標)2502から成る群から選択される非洗浄性界面活性剤をさらに含む、標的核酸を検出する方法。
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WO2008013885A2 (en) | 2008-01-31 |
EP2069487A4 (en) | 2010-06-16 |
WO2008013885A3 (en) | 2008-11-27 |
EP2069487A2 (en) | 2009-06-17 |
US20080064071A1 (en) | 2008-03-13 |
JP2009544316A (ja) | 2009-12-17 |
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