JP2022513371A - ポリデオキシヌクレオチド合成のための改変テンプレート非依存性酵素 - Google Patents
ポリデオキシヌクレオチド合成のための改変テンプレート非依存性酵素 Download PDFInfo
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- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/10—Transferases (2.)
- C12N9/12—Transferases (2.) transferring phosphorus containing groups, e.g. kinases (2.7)
- C12N9/1241—Nucleotidyltransferases (2.7.7)
- C12N9/1264—DNA nucleotidylexotransferase (2.7.7.31), i.e. terminal nucleotidyl transferase
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- C12P19/00—Preparation of compounds containing saccharide radicals
- C12P19/26—Preparation of nitrogen-containing carbohydrates
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- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
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- C12Y—ENZYMES
- C12Y207/00—Transferases transferring phosphorus-containing groups (2.7)
- C12Y207/07—Nucleotidyltransferases (2.7.7)
- C12Y207/07031—DNA nucleotidylexotransferase (2.7.7.31), i.e. terminal deoxynucleotidyl transferase
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Abstract
Description
本出願は、2018年10月19日出願の米国特許出願第16/165,465号(その内容は、本明細書に参考として援用される)に基づく優先権を主張する。
本発明は、所望の配列を有するポリヌクレオチドの、テンプレートを使用せずにデノボ合成するための改変された酵素に関する。よって、本発明は、研究、遺伝子工学、および遺伝子治療のための種々の配列および種々の長さのポリヌクレオチドのライブラリーを作製する能力を提供する。
大部分のデノボ核酸配列は、30年より前に開発された固相ホスホルアミダイト技術を使用して合成される。その技術は、天然の(または非天然の)核酸塩基に対応するホスホルアミダイト試薬から構築される配列の連続的脱保護および合成を伴う。しかし、ホスホルアミダイト核酸合成は、長さにおいて200塩基対(bp)を超える核酸が、高率の破損および副反応を経験するという点において長さに制限がある。さらに、ホスホルアミダイト合成は、毒性の副生成物を生じ、この廃棄物の処分は、核酸合成器の利用可能性を制限し、契約オリゴ生成の費用を増大させる(オリゴヌクレオチド合成の年間需要は、300,000ガロン超もの危険な化学廃棄物(アセトニトリル、トリクロロ酢酸、トルエン、テトラヒドロフラン、およびピリジンが挙げられる)の原因であると予測される。LeProustら, Nucleic Acids Res., vol. 38(8), p.2522-2540, (2010)(本明細書に参考として援用される)を参照のこと)。従って、オリゴヌクレオチド合成のためのより効率的でかつ費用効果的な方法が必要である。
本発明は、テンプレートの非存在下でオリゴヌクレオチドのデノボ配列決定のために使用され得る改変された末端デオキシヌクレオチジルトランスフェラーゼ(TdT)酵素を開示する。計算によるガイダンスおよび飽和変異誘発(saturation mutagenesis)とその後のスクリーニングとの組み合わせを通じて、テンプレート非依存性ポリメラーゼを作り出して、機能的変異体を同定するための方法がまた、開示される。いくつかの実施形態において、上記改変されたTdTは、合成の間にヌクレオチドと相互作用する、GGFRRまたはTGSRモチーフにおいて変異を含む。
本発明は、核酸アナログとともに使用され得る改変された酵素を提供することによって、ポリヌクレオチド(例えば、DNA)の合成を容易にする。開示される方法を使用すると、改変されたテンプレート非依存性末端デオキシヌクレオチジルトランスフェラーゼ(TdT)が得られ、これは、デノボオリゴデオキシヌクレオチドの酵素媒介性合成を可能にし、それによって、遺伝子合成のための慣用的なアセンブリにおけるそれらの使用を可能にする。本発明の酵素は、固体支持体上で所定の配列のポリヌクレオチドを合成する水性ベースの酵素媒介性の方法にふさわしい。
図6は、4つの例示的な3’-O-ブロックされたdNTPアナログ、すなわち、3’-O-アジドメチル-dATP、3’-O-アジドメチル-dCTP、3’-O-アジドメチル-dGTP、および3’-O-アジドメチル-dTTPを示す。各3’-O-アジドメチルアナログの合成は、以下に記載され、図7~12に詳述される。上記3’-O-ブロックされたdNTPアナログはまた、専門業者(例えば、Azco Biotech, Oceanside, CA)から購入され得る。対応する3’-O-ブロックされたリボヌクレオチドが、特注のRNAオリゴの作製を可能にするために類似の合成法で形成され得ることは、理解されるべきである。
マウス(mur)TdT改変体は、380aaの合成遺伝子に由来した。この骨格は、WTマウスTdTの短縮化バージョンであり、ET配列のアミノ酸XXで出発し、アミノ酸XXXで終了する触媒コアを表す。化学合成したTdT構築物を、N末端6×ヒスチジンタグおよびエンテロキナーゼ切断部位を特徴とするpRSET A細菌発現ベクター(ThermoFisher Scientific GeneArt Gene Synthesis)にクローニングした。合成TdTプラスミドを、100μg/ml カルベニシリンを含むLBアガープレート上にプレートしたDH5α細胞(Biopioneer)において維持した。発現のために、そのpRSET A-マウスTdTプラスミドを、プラスミドおよび細胞を氷上で20分間インキュベートし、続いて、42℃において30秒間のヒートショック、続いて、SOC培地の添加および37℃において30~60分間振盪しながらのインキュベーションによって、BL21(DE3) pLysS細胞(Thermo-Fisher)へと形質転換した。SOC培地を細胞に添加した後に、全体の容積(代表的には60μl)を、100μg/mL カルベニシリン+34μg/mL クロラムフェニコールを含むLBアガープレート上にプレートした。
TdT活性スクリーニングを、種々の3’-O-ブロックされたdNTPアナログおよびビオチン化オリゴヌクレオチドを使用するdNTPポリメラーゼ伸長反応を介して行った:
5Bios G/TAATAATAATAATAATAATAATAATAATAATAATAATTTTTT(ChemGenes Corporation)
試験したdNTPs:
3’-O-アジドメチル-dTTP(上記を参照のこと)
3’-O-アジドメチル-dATP(上記を参照のこと)
3’-O-アジドメチル-dGTP(上記を参照のこと)
3’-O-MOM-dTTP(上記を参照のこと)
3’-O-MTM-dCTP(上記を参照のこと)
3’-アミノオキシ-dTTP(Firebird BioMolecular Sciences EEC)
3’-アミノオキシ-d ATP(Firebird BioMolecular Sciences LLC)
3’-アミノオキシ-dGTP(Firebird BioMolecular Sciences EEC)
3’-O-メチル-dATP(TriLink BioTechnologies LLC)
3’-O-メチル-dGTP(TriLink BioTechnologies LLC)
3’-O-メチル-dCTP(TriLink BioTechnologies LLC)
GGFRRおよびTGSRモチーフ、ならびに上記で考察した隣接するアミノ酸に対するいくつかのアミノ酸改変を、インシリコでモデル化して、上記で記載されるとおりの3’-O-ブロックされたdNTPアナログの増大した取り込みの能力のある改変を決定した。一重、二重、および三重のアミノ酸置換、ならびにアミノ酸挿入をモデル化した。以下の表10は、増大した取り込みを誘発することが見出された改変を示す。アミノ酸位置を、マウスTdTに言及して提供するが、任意のTdTの保存された配列に適用可能である。表10における行は、GGFRRモチーフにおけるかまたはそのモチーフに隣接する1またはこれより多くのアミノ酸に対する塩基改変を記載する。列は、他のアミノ酸(TGSRモチーフにおけるかまたはそのモチーフに隣接するもの)に対する改変のさらなる組み合わせを含む。
他の文書(例えば、特許、特許出願、特許公報、学術雑誌、書籍、論文、ウェブコンテンツ)への言及および引用は、本開示全体を通じて行われている。全てのこのような文書は、全ての目的のためにそれらの全体において本明細書に参考として援用される。
本発明の種々の改変およびその多くのさらなる実施形態は、本明細書に示され、記載されるものに加えて、本明細書で引用される科学文献および特許文献への言及を含めて、本文書の全内容から当業者に明らかになる。本明細書中の主題は、その種々の実施形態およびその均等物において本発明の実施に適合され得る、重要な情報、説明およびガイダンスを含む。
Claims (20)
- GGFRRアミノ酸モチーフにおいて変異を含む改変された末端デオキシヌクレオチジルトランスフェラーゼ(TdT)であって、前記改変されたTdTは、除去可能な3’-O-ブロッキング部分を含むヌクレオチドアナログを核酸イニシエーターの3’-OHに付加し得る、改変された末端デオキシヌクレオチジルトランスフェラーゼ。
- 前記改変されたTdTは、天然のTdTと比較して、増大した速度で前記除去可能な3’-O-ブロッキング部分を含むヌクレオチドアナログを前記核酸イニシエーターの3’-OHに付加し得る、請求項1に記載の改変されたTdT。
- 前記改変されたTdTは、TGSRアミノ酸モチーフにおいて変異をさらに含む、請求項1に記載の改変されたTdT。
- 前記改変されたTdTは、N末端t-138ウシTdTおよび前記N末端に融合されたタンパク質タグ配列を含む、請求項1に記載の改変されたTdT。
- 前記改変されたTdTは、N末端t-151ウシTdTおよび前記N末端に融合されたタンパク質タグ配列を含む、請求項1に記載の改変されたTdT。
- 前記改変されたTdTは、N末端t-160ウシTdTおよび前記N末端に融合されたタンパク質タグ配列を含む、請求項1に記載の改変されたTdT。
- 前記改変されたTdTは、除去可能な3’-O-ブロッキング部分で改変された、アデニン、シトシン、グアニン、およびチミンデオキシリボヌクレオチドを付加し得る、請求項1に記載の改変されたTdT。
- 前記ヌクレオチドは、2’-デオキシリボヌクレオチドである、請求項7に記載の改変されたTdT。
- 前記改変されたTdTは、除去可能な3’-O-ブロッキング部分で改変されたアデニン、シトシン、グアニン、およびウラシルリボヌクレオチドを付加し得る。請求項1に記載の改変されたTdT。
- 前記除去可能な3’-O-ブロッキング部分は、3’-O-アジドメチル基を含む、請求項1に記載の改変されたTdT。
- 前記除去可能な3’-O-ブロッキング部分は、3’-O-アミノ基を含む、請求項1に記載の改変されたTdT。
- 前記除去可能な3’-O-ブロッキング部分は、3’-O-アリル基を含む、請求項1に記載の改変されたTdT。
- 前記除去可能な3’-O-ブロッキング部分は、O-フェノキシアセチル;O-メトキシアセチル;O-アセチル;O-(p-トルエン)スルホネート;O-ホスフェート;O-ニトレート;O-[4-メトキシ]-テトラヒドロチオピラニル;O-テトラヒドロチオピラニル;O-[5-メチル]-テトラヒドロフラニル;O-[2-メチル,4-メトキシ]-テトラヒドロピラニル;O-[5-メチル]-テトラヒドロピラニル;およびO-テトラヒドロチオフラニルからなる群より選択される、請求項1に記載の改変されたTdT。
- 前記改変されたTdTは、3’-O-ブロックされたヌクレオチド5’-トリホスフェートを取り込み得、前記除去可能なブロッキング部分は、エステル、エーテル、カルボニトリル、ホスフェート、カーボネート、カルバメート、ヒドロキシルアミン、ボレート、ニトレート、糖、ホスホルアミド、ホスホルアミデート、フェニルスルフェネート、スルフェート、スルホンおよびアミノ酸から選択される基を含む、請求項1に記載の改変されたTdT。
- 前記改変されたTdTは、約30℃の反応温度で改変されたヌクレオチドを取り込み得る、請求項1に記載の改変されたTdT。
- 前記改変されたTdTは、30℃~80℃の反応温度で改変されたヌクレオチドを取り込み得る、請求項1に記載の改変されたTdT。
- 前記改変されたTdTは、1000μMまたはこれ未満の濃度で改変されたヌクレオチドを取り込み得る、請求項1に記載の改変されたTdT。
- 前記改変されたTdTは、100μMまたはこれ未満の濃度で改変されたヌクレオチドを取り込み得る、請求項17に記載の改変されたTdT。
- 前記改変されたTdTは、配列番号2、4、6、または8と少なくとも90%同一である核酸配列を含むゲノムを有する生物によって発現される、請求項1に記載の改変されたTdT。
- 前記GGFRRモチーフは、G、A、V、L、I、M、F、W、P、S、T、C、Y、N、Q、D、E、K、R、またはHから選択される変異を含む、請求項1に記載の改変されたTdT。
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US20160108382A1 (en) * | 2014-10-20 | 2016-04-21 | Molecular Assemblies, Inc. | Modified template-independent enzymes for polydeoxynucleotide synthesis |
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