JP7538807B2 - テンプレートなしの酵素によるポリヌクレオチド合成における効率的生成物切断 - Google Patents
テンプレートなしの酵素によるポリヌクレオチド合成における効率的生成物切断 Download PDFInfo
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- JP7538807B2 JP7538807B2 JP2021547080A JP2021547080A JP7538807B2 JP 7538807 B2 JP7538807 B2 JP 7538807B2 JP 2021547080 A JP2021547080 A JP 2021547080A JP 2021547080 A JP2021547080 A JP 2021547080A JP 7538807 B2 JP7538807 B2 JP 7538807B2
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Description
ポリヌクレオチド合成の酵素によるアプローチにおける関心事は、多くの分野(例えば、合成生物学、CRISPR-Cas9適用、ハイスループットシーケンシングなど)において合成ポリヌクレオチドの需要の増大およびポリヌクレオチド合成の化学的アプローチの制限の両方が原因で、近年増大している。Jensenら, Biochemistry, 57: 1821-1832 (2018)。現在、大部分の酵素によるアプローチは、テンプレートなしのポリメラーゼを使用して、3’-O-ブロックされたヌクレオシド三リン酸を、支持体に付着した1本鎖開始剤または伸長した鎖に繰り返し付加し、続いて、所望の配列のポリヌクレオチドが得られるまで脱ブロックする。このような酵素による合成の実際的な実行を考案するという難題の中には、所望のポリヌクレオチド生成物を、開始剤配列および支持体から切断する、費用効果的かつ効率的方法を見出すことがある。
本発明は、エンドヌクレアーゼV活性を使用して、ポリヌクレオチド生成物をその開始剤から効率的に切断する工程を含むかまたは可能にするテンプレートなしの酵素によるポリヌクレオチド合成のための方法およびキットに関する。
本発明の一般原理は、特に例示(例えば、図面に示され、詳細に記載されるもの)によって、本明細書でより詳細に開示される。しかし、本発明が、発明を記載される特定の実施形態に限定するべきではないことは理解されるべきである。本発明は、種々の改変および代替の形態を受け入れる余地がある。その具体的なものは、いくつかの実施形態に関して示される。この意図は、本発明の原理および範囲の中に入る全ての改変、等価物、および選択肢を網羅することである。
テンプレートなしの酵素によるポリヌクレオチド合成は、テンプレートなしのポリメラーゼ(例えば、末端デオキシヌクレオチジルトランスフェラーゼ(TdT))(3’-O-ブロックされたデオキシヌクレオシド三リン酸(3’-O-ブロックされたdNTP)により効率的に適応するように操作されたその改変体を含む)を使用する種々の公知のプロトコールによって行われ得る。例えば、Ybertら, 国際特許公開WO/2015/159023; Ybertら, 国際特許公開WO/2017/216472; Hyman, 米国特許第5436143号; Hiattら, 米国特許第5763594号; Jensenら, Biochemistry, 57: 1821-1832 (2018); Mathewsら, Organic & Biomolecular Chemistry, DOI: 0.1039/c6ob01371f (2016); Schmitzら, Organic Lett., 1(11): 1729-1731 (1999)。
-O-Z
ここで-Zは、-C(R’)2-O-R”、-C(R’)2-N(R”)2、-C(R’)2-N(H)R”、-C(R’)2-S-R”および-C(R’)2-Fであり、ここで各R”は、除去可能な保護基であるかまたはその一部であり;各R’は、独立して、水素原子、アルキル、置換されたアルキル、アリールアルキル、アルケニル、アルキニル、アリール、ヘテロアリール、複素環式、アシル、シアノ、アルコキシ、アリールオキシ、ヘテロアリールオキシもしくはアミド基、あるいは連結基を通じて付着された検出可能な標識であり;ただし、いくつかの実施形態において、このような置換基は、10個までの炭素原子および/または5個までの酸素もしくは窒素ヘテロ原子を有するか;または(R’)2は、式 =C(R”’)2の基を表し、ここで各R”’は、同じであってもことなっていてもよく、水素原子およびハロゲン原子を含む基並びにアルキル基から選択され、ただしいくつかの実施形態において、各R’”のアルキルは、1~3個の炭素原子を有し;ここで上記分子は、各R”がHの代わりに交換される中間体を生じるように反応され得るか、またはZが-(R’)2-Fである場合、Fは、OH、SHもしくはNH2(好ましくはOH)の代わりに交換され、その中間体は、遊離3’-OHを有する分子を得るために水性条件下で解離し;ただしZが-C(R’)2-S-R”である場合、両方のR’基は、Hではない。ある特定の実施形態において、改変されたヌクレオチドまたはヌクレオシドのR’は、アルキルまたは置換されたアルキルであるが、ただしこのようなアルキルまたは置換されたアルキルは、1~10個の炭素原子および0~4個の酸素もしくは窒素ヘテロ原子を有する。ある特定の実施形態において、改変されたヌクレオチドまたはヌクレオシドの-Zは、式 -C(R’)2-N3のものである。ある特定の実施形態において、Zは、アジドメチル基である。
本発明は、本発明の方法を行うためのキットを含む。いくつかの実施形態において、本発明のキットは、5’末端によって支持体に付着され、3’末端に対して最後から2番目のデオキシイノシンおよび遊離3’-ヒドロキシルを有する開始剤を含む。いくつかの実施形態において、本発明のキットは、上記開始剤の末端ヌクレオチドの3’側で開始剤-ポリヌクレオチド結合体を切断し得るエンドヌクレアーゼVをさらに含む。いくつかのこのようなキットにおいて、上記エンドヌクレアーゼVは、反応混合物からの除去を可能にする捕捉部分を有する。いくつかのキットにおいて、このような捕捉部分は、Hisタグである。いくつかの実施形態において、キットの開始剤は、5’-dI-dT-3’の3’末端配列を有する。いくつかの実施形態において、キットの開始剤は、5’-dI-dG-3’の3’末端配列を有する。いくつかの実施形態において、キットの開始剤は、5’-dI-dA-3’の3’末端配列を有する。いくつかの実施形態において、キットの開始剤は、5’-dI-dT-3’、5’-dI-dG-3’、または5’-dI-dA-3’の3’末端配列を有する。いくつかの実施形態において、このような支持体は、固体支持体である。このような固体支持体は、ビーズ(例えば、磁性ビーズ)、平らな固体(例えば、ガラススライド)、または膜などを含み得る。いくつかの実施形態において、本発明のキットは、テンプレートなしのポリメラーゼ、ならびにデオキシアデノシン、デオキシグアノシン、チミジン、デオキシウリジンおよびデオキシシチジンのうちの1または複数の3’-O-ブロックされたヌクレオシド三リン酸をさらに含み得る。いくつかのキットにおいて、このようなテンプレートなしのポリメラーゼは、TdTであり得る。いくつかの実施形態において、このようなTdTは、本明細書で記載されるTdT改変体であり得る。いくつかの実施形態において、本発明のキットは、3’ブロッキング基を、組み込まれた、3’-O-ブロックされたヌクレオチドから除去し得る脱ブロッキング剤をさらに含み得る。
本明細書中で特段具体的に定義されなければ、本明細書で使用される核酸化学、生化学、遺伝学、および分子生物学の用語および記号は、当該分野の標準的な決まりごとおよび教科書のもの(例えば、Kornberg and Baker, DNA Replication, 第2版(W.H. Freeman, New York, 1992); Lehninger, Biochemistry, 第2版(Worth Publishers, New York, 1975); Strachan and Read, Human Molecular Genetics, 第2版(Wiley-Liss, New York, 1999))に従う。
Claims (12)
- 所定の配列を有するポリヌクレオチドを合成する方法であって、前記方法は、
a)3’-最後から2番目のデオキシイノシンおよび遊離3’-ヒドロキシルを有する3’-末端ヌクレオチドを有する開始剤を提供する工程;
b)(i)伸長条件下で、前記開始剤または遊離3’-O-ヒドロキシルを有する伸長したフラグメントと、3’-O-ブロックされたヌクレオシド三リン酸および末端デオキシヌクレオチジルトランスフェラーゼとを接触させ、その結果、前記開始剤または伸長したフラグメントは、3’-O-ブロックされたヌクレオシド三リン酸の取り込みによって伸長されて、3’-O-ブロックされ伸長したフラグメントを形成する工程、ならびに(ii)前記伸長したフラグメントを脱ブロックして、前記ポリヌクレオチドが形成されるまで、遊離3’-ヒドロキシルを有する伸長したフラグメントを形成する工程、のサイクルを反復する工程;
c)前記ポリヌクレオチドをエンドヌクレアーゼV活性で処理して、前記ポリヌクレオチドを前記開始剤から切断し、その結果、前記開始剤から切断された前記ポリヌクレオチドが5’-モノホスフェートを有する工程、
を包含する方法。 - 前記エンドヌクレアーゼV活性は、原核生物エンドヌクレアーゼVによって提供される、請求項1に記載の方法。
- 前記原核生物エンドヌクレアーゼVは、E.coliエンドヌクレアーゼVである、請求項2に記載の方法。
- 前記原核生物エンドヌクレアーゼVを前記切断されたポリヌクレオチドから除去する工程をさらに包含する、請求項2または3に記載の方法。
- 前記開始剤は、5’末端によって支持体に付着される、請求項1~4のいずれか1項に記載の方法。
- 前記支持体は、固体支持体である、請求項5に記載の方法。
- 前記開始剤は、5’-dI-dT-3’の3’-末端配列を有する、請求項1~6のいずれか1項に記載の方法。
- 請求項1に記載の方法によりポリヌクレオチドを酵素的に合成するためのキットであって、5’末端によって支持体に付着され、かつ3’-最後から2番目のデオキシイノシンおよび遊離3’-ヒドロキシルを有する3’-末端ヌクレオチドを有する開始剤を含み、
開始剤-ポリヌクレオチド結合体を、前記開始剤の末端ヌクレオチドの3’側で切断し得るエンドヌクレアーゼV、末端デオキシヌクレオチジルトランスフェラーゼ、ならびに、デオキシアデノシン、デオキシグアノシン、チミジン、デオキシウリジンおよびデオキシシチジンのうちの1または複数のための、3’-O-ブロックされたヌクレオシド三リン酸をさらに含む、キット。 - 前記開始剤は、5’-dI-dT-3’の3’-末端配列を有する、請求項8に記載のキット。
- 前記支持体は、固体支持体である、請求項8又は9に記載のキット。
- 脱ブロッキング剤をさらに含む、請求項8~10のいずれか1項に記載のキット。
- 前記3’-O-ブロックされたヌクレオシド三リン酸は、3’-O-NH2-ヌクレオシド三リン酸である、請求項8に記載のキット。
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