JP6014805B2 - テイラードマルチサイトコンビナトリアルアセンブリー - Google Patents
テイラードマルチサイトコンビナトリアルアセンブリー Download PDFInfo
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Classifications
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- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/10—Processes for the isolation, preparation or purification of DNA or RNA
- C12N15/102—Mutagenizing nucleic acids
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- C12N15/09—Recombinant DNA-technology
- C12N15/10—Processes for the isolation, preparation or purification of DNA or RNA
- C12N15/102—Mutagenizing nucleic acids
- C12N15/1024—In vivo mutagenesis using high mutation rate "mutator" host strains by inserting genetic material, e.g. encoding an error prone polymerase, disrupting a gene for mismatch repair
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- C12R2001/00—Microorganisms ; Processes using microorganisms
- C12R2001/01—Bacteria or Actinomycetales ; using bacteria or Actinomycetales
- C12R2001/185—Escherichia
- C12R2001/19—Escherichia coli
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Description
(b)上記反応混合物をポリメラーゼ伸長反応に供し、上記少なくとも3個のプライマーから、伸長され、改変された複数のポリヌクレオチドを得ること。
(b)上記反応混合物をポリメラーゼ伸長反応に供し、上記少なくとも2個のプライマーから、伸長され、改変された複数のポリヌクレオチドを得ること、
(c)伸長され、改変された上記複数のポリヌクレオチドを酵素で処理して上記鋳型ヌクレオチドを破壊すること、
(d)リガーゼによって処理されていない、処理され、伸長され、改変された前記ポリヌクレオチドを、細胞に形質転換すること、
(e)伸長され、改変された複数のポリヌクレオチドを細胞から回収すること、及び
(f)目的とする突然変異を含む、伸長され、改変された複数のポリヌクレオチドを選択すること。
2.TMCAは、野生型の遺伝子を基礎として、特定の遺伝子変異体を作製するために使用できる。
3.TMCAは、突然変異、欠失、又は挿入を組み合わせるために使用することもできる。
4.TMCAは、突然変異、欠失、または挿入の組み合わせのライブラリーを、制御可能な様式により作製するために使用することができる。
5.TMCAは、複数位置の組み合わせのGSSMSMライブラリーを作成するために使用することができる。
TMCA反応
↓
DpnI処理
↓
宿主への形質転換
↓
スクリーニング
条件1
Pfu 10×緩衝液 2.5μl
DMSO 2.5μl
dNPT混合液(10mM) 0.5μl
鋳型DNA(25ng/μl) 1μl
Pfuターボ 0.5μl
水 14μl
フォワードプライマー(5μM) 2μl
リバースプライマー(5μM) 2μl
合計 25μl
Pfx Accu 緩衝液 5μl
鋳型DNA(25ng/μl) 1μl
Pfx Accuprime 0.4μl
水 37.6μl
フォワードプライマー(5μM) 3μl
リバースプライマー(5μM) 3μl
合計 50μl
Pfx Accu緩衝液 2.5μl
鋳型DNA(25ng/μl) 1μl
Pfx Accuprime 0.2μl
水 17.3μl
フォワードプライマー(5μM) 2μl
リバースプライマー(5μM) 2μl
合計 25μl
始めの変性 95℃;1分 93℃;3分
変性 95℃;45秒 95℃;45秒 |
対合 50℃;1分 50℃;45秒 |20サイクル
伸長 68℃;2分/kb 68℃;2分/kb |
改良 68℃;5分 68℃;5分
4℃;無期限 4℃;無期限
2.TMCA反応物のうち50を電気泳動に供し、上記反応が成功しているかを決定する。
3.Dpn1制限酵素のうち10を3μlの水と1μlの緩衝液4(ニューイングランドバイオラボ社)で希釈する。TMCA反応物のそれぞれに、希釈した酵素を5μlずつ加える。37℃で4時間から8時間保温する。
4.標準的な形質転換の手順により、Dpn1で処理した反応物をE.coli細胞に形質転換する。
5.シーケンシング又は所望の検定により、結果として生じたコロニーをスクリーニングする。
最初の実験では、遺伝子上の6箇所の位置が選択されて組み合わされた(図5)。反応は、3箇所の位置のフォワードプライマーと残る3箇所の位置の3個のリバースプライマーとを用いて設計された。上記反応から得られた変異体は、シーケンシングにより同定された。64個の異なる可能な組み合わせが存在した。条件1の下では、より少ない数の突然変異部位を有する変異体がより多く生成した(図6)。条件2及び2の下では、より多い数の突然変異部位を有する変異体がより多く生成した。組み合わされたデータ(合計)からの全ての可能な組み合わせの分布は、統計的な計算による分布パターンと類似していた(図6)。図7の一つの曲線は、突然変異体の予測されるカバー率(%)を示し、もう一つの曲線は、0クローンから600クローンがスクリーニングされたときの、完全なカバーの可能性を示す。予測されるカバー率(%)の曲線上の円(即ち、78%、95%、99%、及び100%)は、96クローン、192クローン、288クローン、又は384クローンがスクリーニングされたときの予測されるカバー率を示す。予測されるカバー率(%)の曲線の下の四角(即ち、70%、91%、95%、及び98%)は、実験データから得られる実際のカバー率を示す。上記データでは、予測されるカバー率と実際のカバー率との間でのほぼ完全な一致を示す。
第2の実験において、遺伝子上の4箇所の位置が選択され、組み合わせた(図8)。上記反応は、2箇所の位置のフォワードプライマーと残る2箇所の位置の2個のリバースプライマーとを用いて設計された。上記反応により得られた変異体は、シーケンシングにより同定された。16個の異なる可能な組み合わせが存在した。第1の実験と同様に、条件1はより少ない数の突然変異部位を有する変異体をより多く生成し、条件2及び3はより多い数の突然変異部位を有するより変異体をより多く生成した(図9及び図10)。組み合わされたデータ(合計)からの全ての可能な組み合わせの分布は、統計的計算から得られる分布パターンと類似していた(図9及び図10)。
第3の実験において、遺伝子上の3箇所の位置が選択され、組み合わされた(図11)反応は、2箇所の位置のフォワードプライマーと、第3の位置の1個のリバースプライマーを用いて設計された。上記反応から得られた変異体は、シーケンシングにより同定された。この場合において、8個の異なる可能な組み合わせが存在した。条件9Bの下では、24コロニーのシーケンシングによって、8個の変異体全てが回収された。図12参照。
熱的安定性を改善し、リパーゼの特異的活性を向上させるために、GSSMSMにより活性が向上した13個の突然変異(up−mutant)が選択された(5箇所の位置)(図13)。3箇所の位置(N168S、N171E、及びM176W)は共にグループ化され、単一のプライマーに含まれた。ライブラリーの大きさは、6×6×2×2×2=228となった。反応は、以下の方法により準備された:フォワードプライマーがフォワード群に分類され、リバースプライマーがリバース群に分類され、そしてフォワード群のプライマーとリバース群のプライマーが、互いに独立に、対応する群の中で鋳型のポリヌクレオチドの位置に関係なく等濃度になるように標準化され、標準化された後に等量の上記フォワードプライマーと上記リバースプライマーが反応溶物に添加された。位置1と位置2の組み合わせは偏っていた(図13、及び図14A、B、C)。位置1及び位置3の組み合わせ、又は位置2及び位置3の組み合わせと比較して、位置1及び位置2の組み合わせにおいて、可能な特有の変異体のより低い確率が実現した。2回のTMCA反応が行われた。第2の回において、第1の回から得られた変異体のうちの一部が使用された。720クローンのシーケンシングの後(2.5×ライブラリーの被覆率)、第1の回の288の特有の変異体のうち46%が得られた。ここで、1×被覆率のシーケンシングは、シーケンシングされた変異体(子世代)の数が可能な特有の変異体の数に等しいことを意味し、従って、2.5×被覆率は、シーケンシングされた変異体(子世代)の数が可能な特有の変異体の数(288)の2.5倍であることを示す。2回のTMCA反応が行われた。第2の回において、第1の回により得られた変異体の一部が鋳型のポリヌクレオチドとして使用された。第2の回において、それぞれのTMCA反応に使用されたプライマーは、第1の回において得られなかった変異体を得られるように仕立てられた。第2の回の後、288の特有な変異体の95.5%が得られた。スクリーニングの後、このライブラリーから、10個の活性が向上した突然変異体(up−mutant)が得られた(図14A、B、C)。
Claims (22)
- 変異が導入された複数のポリヌクレオチドを製造する方法であって、
(a)環状二本鎖DNAである鋳型のポリヌクレオチドの配列情報を取得すること、及び目的とする3以上の突然変異を鋳型ヌクレオチドに沿って同定すること;
(b)少なくとも3個のプライマーを、単一の反応混合物の中の二重鎖の鋳型のポリヌクレオチドに添加すること;ここで、前記少なくとも3個のプライマーは重複しておらず;前記少なくとも3個のプライマーのそれぞれは、他のプライマーとは異なる少なくとも1個の突然変異を含み;少なくとも1個のプライマーは、前記鋳型のマイナス鎖に対合可能なフォワードプライマーであり;少なくとも1個のプライマーは、前記鋳型のプラス鎖に対合可能なリバースプライマーであり;
(c)前記反応混合物をポリメラーゼ伸長反応に供して環状の鋳型分子に沿って伸長を完全に進行させ、前記少なくとも3個のプライマーから、伸長され、変異が導入された複数のポリヌクレオチドを得ること;及び
(d)酵素で処理して環状の鋳型分子を破壊すること、を含む方法。 - 更に、リガーゼにより処理されていない、伸長された複数の生成物を細胞に形質転換することを含む、請求項1に記載の方法。
- 更に、伸長され、変異が導入された前記複数のポリヌクレオチドを前記細胞から回収することを含む、請求項2に記載の方法。
- 更に、伸長され、変異が導入された前記複数のポリヌクレオチドを分析することを含む、請求項3に記載の方法。
- 分析が、伸長され、変異が導入された前記複数のポリヌクレオチドの少なくとも1個を発現させ、そこから発現されたポリペプチドを分析することを含む、請求項4に記載の方法。
- 更に、目的とする突然変異を含んだ、伸長され、変異が導入された前記複数のポリヌクレオチドを選択することを含む、請求項5に記載の方法。
- 更に、ポリメラーゼ伸長により製造された、伸長され、変異が導入された前記複数のポリヌクレオチドを分析することを含む、請求項1に記載の方法。
- 更に、処理され、伸長され、変異が導入された前記ポリヌクレオチドを細胞に形質転換すること、伸長され、変異が導入された前記複数のポリヌクレオチドを細胞から回収すること、目的とする突然変異を含んだ、伸長され、変異が導入された前記複数のポリヌクレオチドを選択することを含む、請求項1に記載の方法。
- 前記細胞がE.coli細胞である、請求項8に記載の方法。
- 少なくとも4個のプライマーが添加される、請求項1に記載の方法。
- 少なくとも12個のプライマーが添加される、請求項1に記載の方法。
- それぞれのプライマーがシングルスポット突然変異を含む、請求項1に記載の方法。
- 少なくとも2個のフォワードプライマーが、鋳型のポリヌクレオチド上の同一の位置に異なる変更を含む、請求項1に記載の方法。
- 少なくとも2個のリバースプライマーが、鋳型のポリヌクレオチド上の同一の位置に異なる変更を含む、請求項1に記載の方法。
- 少なくとも1個のプライマーが、鋳型のポリヌクレオチド上の異なる位置に少なくとも2個の変更を含む、請求項1に記載の方法。
- 少なくとも1個のプライマーが鋳型のポリヌクレオチド上の異なる位置に少なくとも2個の変更を含み、且つ少なくとも2個のフォワードプライマー又は少なくとも2個のリバースプライマーが鋳型のポリヌクレオチド上の同一の位置に異なる変更を含む、請求項1に記載の方法。
- 少なくとも1個のプライマーが、それぞれ1個の縮重部位を含む縮重プライマーのセットであり、目的とする突然変異が前記縮重部位における異なる多様なヌクレオチドである、請求項1に記載の方法。
- 少なくとも1個のプライマーが、前記鋳型のポリヌクレオチドの少なくとも1個のコドンに対応する少なくとも1個の縮重コドン、及び前記鋳型のポリヌクレオチドの前記コドンに隣接する配列に相同性を有する少なくとも1個の隣接する配列を含む縮重プライマーのセットである、請求項1に記載の方法。
- 前記縮重コドンが、20未満の天然アミノ酸をコードできる、請求項18に記載の方法。
- 前記フォワードプライマーがフォワード群に分類され、前記リバースプライマーがリバース群に分類され、前記フォワード群のプライマー及び前記リバース群のプライマーが、互いに独立して、前記鋳型のポリヌクレオチド上の位置に関係なく、対応する群の中で等濃度となるように標準化され、標準化後に等量のフォワードプライマーとリバースプライマーとが反応に添加される、請求項1に記載の方法。
- 前記鋳型のポリヌクレオチド上のプライマーの位置に応じてプライマーを複数の群に組織化し;ここで、前記鋳型上の同一の選択された領域に亘るプライマーを1個の群に含め;
グループ化されたプライマーをそれぞれの群の中で等濃度となるように標準化し、
1つの群のフォワードプライマーをフォワード群に集めて、フォワードプライマーのそれぞれの群の間で濃度が等しくなるように標準化し、
1つの群のリバースプライマーをリバース群に集めて、リバースプライマーのそれぞれの群の間で濃度が等しくなるように標準化し、
集められた等量のフォワードプライマー及びリバースプライマーを反応に添加することを、工程(b)の前に含む請求項1に記載の方法。 - 更に、工程(b)から(c)を2回行い、第1の回で製造されたポリヌクレオチドを第2の回で鋳型ヌクレオチドとして使用する、請求項1に記載の方法。
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