JPWO2020209332A1 - 核酸結合性タンパク質 - Google Patents
核酸結合性タンパク質 Download PDFInfo
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- JPWO2020209332A1 JPWO2020209332A1 JP2021513700A JP2021513700A JPWO2020209332A1 JP WO2020209332 A1 JPWO2020209332 A1 JP WO2020209332A1 JP 2021513700 A JP2021513700 A JP 2021513700A JP 2021513700 A JP2021513700 A JP 2021513700A JP WO2020209332 A1 JPWO2020209332 A1 JP WO2020209332A1
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Abstract
Description
本願は、2019年4月9日に、日本に出願された特願2019−074004号に基づき優先権を主張し、その内容をここに援用する。
[1] 3個以上のTAL−repeatが繰り返し連結されたDNA結合ドメインを含有し、塩基配列非依存的に核酸に結合することを特徴とする、核酸結合性タンパク質。
[2] 前記TAL−repeatのRVD配列が、HT、RS、又はHSである、前記[1]の核酸結合性タンパク質。
[3] 前記DNA結合ドメインにおける前記TAL−repeatの繰り返し数が、3個以上35個未満である、前記[1]又は[2]の核酸結合性タンパク質。
[4] 前記DNA結合ドメインは、同一アミノ酸配列からなる前記TAL−repeatが繰り返し連結されている、前記[1]〜[3]のいずれかの核酸結合性タンパク質。
[5] 前記DNA結合ドメインが、前記TAL−repeatのRVD配列がHT、RS、又はHSであるように改変されたTALEのDNA結合ドメインである、前記[1]〜[4]のいずれかの核酸結合性タンパク質。
[6] 前記DNA結合ドメインに含まれている前記TAL−repeatは、キサントモナス属細菌由来のTALEのTAL−repeat、又は前記TAL−repeatのRVD以外の領域にアミノ酸変異が導入されているTAL−repeatである、前記[1]〜[5]のいずれかの核酸結合性タンパク質。
[7] 前記DNA結合ドメインを含有するタンパク質と蛍光タンパク質とが、直接又は間接的に結合したタンパク質である、前記[1]〜[6]のいずれかの核酸結合性タンパク質。
[8] 前記[1]〜[7]のいずれかの核酸結合性タンパク質からなり、オープンクロマチン構造と選択的に結合する、タンパク質プローブ。
[9] 前記[1]〜[7]のいずれかの核酸結合性タンパク質をコードする塩基配列を含有する、核酸分子。
[10] 前記[9]の核酸分子が組込まれており、宿主細胞において、前記[1]〜[7]のいずれかの核酸結合性タンパク質を発現し得る、発現ベクター。
[11] 生細胞に、核酸結合性タンパク質をコードする遺伝子を導入する工程を有し、
前記核酸結合性タンパク質が、3個以上のTAL−repeatが繰り返し連結されたDNA結合ドメインと蛍光タンパク質とを含むタンパク質であり、
前記DNA結合ドメインが、塩基配列非依存的に核酸と結合することを特徴とする、生細胞中のオープンクロマチンを蛍光標識する方法。
[12] 前記[1]〜[7]のいずれかの核酸結合性タンパク質をコードする遺伝子が導入された、形質転換細胞(但し、ヒトを構成する細胞を除く)。
[13] 前記[1]〜[7]のいずれかの核酸結合性タンパク質をコードする遺伝子が導入された、形質転換非ヒト動物。
本発明に係る核酸結合性タンパク質は、3個以上のTAL−repeatが繰り返し連結されたDNA結合ドメインを含有し、塩基配列非依存的に結合することを特徴とする。本発明に係る核酸結合性タンパク質中のTAL−repeatは、アデニン、グアニン、チミン、及びシトシンの4種の核酸塩基に対して、ほぼ同程度に充分な強さで結合する。このため、当該TAL−repeatが繰り返し連結されたDNA結合ドメインを備える本発明に係る核酸結合性タンパク質は、塩基配列非依存的に核酸と強く結合する。以降、4種の核酸塩基に対してほぼ同程度に充分な強さで結合するTAL−repeatを、「非選択的結合性TAL−repeat」ということがある。
本発明に係る核酸結合性タンパク質は、塩基配列非依存的に核酸と強く結合する。このため、本発明に係る核酸結合性タンパク質のうち、標識部位を備えるタンパク質は、広く核酸を認識するタンパク質プローブとして有用である。特に、本発明に係る核酸結合性タンパク質は、染色体において、凝集クロマチンよりもオープンクロマチン構造と選択的に認識する。このため、本発明に係る核酸結合性タンパク質は、オープンクロマチン構造を認識するプローブとして有用である。特に、標的部位として蛍光物質を含む本発明に係る核酸結合性タンパク質(以下、「本発明に係る核酸結合性蛍光タンパク質」ということがある。)は、生細胞内でリアルタイムにオープンクロマチン構造を可視化するツールとして用いることができる。本発明に係る核酸結合性蛍光タンパク質は、固定した細胞内のオープンクロマチン構造を可視化するツールとしても使用できる。
本発明に係る核酸結合性タンパク質をコードする塩基配列を含有する核酸分子(以下、「本発明に係る核酸分子」ということがある。)は、翻訳によって目的の核酸結合性タンパク質のアミノ酸配列が得られる塩基配列を含む分子であれば特に限定されるものではない。本発明に係る核酸分子のうち、本発明に係る核酸結合性タンパク質のタンパク質部分をコードする塩基配列は、当該タンパク質を発現させる宿主のコドン使用頻度を考慮して適宜設計されることが好ましい。相同組換えのリスクを低減するため、DNA結合ドメイン中のTAL−repeat部分をコードする塩基配列は、コドンのゆらぎを利用して互いに異なるように設計されることも好ましい。
本発明に係る発現ベクターは、本発明に係る核酸分子が組込まれており、宿主細胞において、本発明に係る核酸結合性タンパク質を発現し得る発現ベクターである。具体的には、上流から、プロモーター配列を有するDNA、本発明に係る核酸分子、及びターミネーター配列を有するDNAからなる発現カセットが、発現ベクターに組込まれている。当該発現カセットの作製及び発現ベクターへの組み込みは、周知の遺伝子組み換え技術を用いることにより実施できる。ポリヌクレオチドの発現ベクターへの組み込みでは、市販の発現ベクター作製キットを用いてもよい。
本発明に係る核酸結合性蛍光タンパク質を生細胞中に導入することにより、オープンクロマチン構造を蛍光標識することができる。本発明に係る核酸結合性蛍光タンパク質が、非選択的結合性TAL−repeatが3個以上、より好ましくは8個以上繰り返し連結された構造からなるDNA結合ドメインと蛍光タンパク質とを含むタンパク質である場合には、当該タンパク質をコードする核酸分子(遺伝子)を生細胞に導入し、当該生細胞内で当該タンパク質を発現させることができる。導入する生細胞は、前記の形質転換体の製造方法の際に挙げられた細胞と同様のものを用いることができる。また、生細胞への遺伝子(核酸分子)の導入方法は、前記の形質転換体の製造方法と同様にして行うことができる。
キサントモナス属の種々の細菌が持つ約1000種類のTALEのDNA結合ドメインについて、RVD配列を調べ、これらのRVD配列を含むTAL−repeatを含むTALE改変体を作製し、核酸塩基への結合性を調べた。
種々のRVD配列を備えるTAL−repeatは、既知のキサントモナス属細菌のTALE配列を元にPCRによって作成し、得られたTAL−repeatを繰り返し連結させることにより、目的のRVD配列を備えるTAL−repeatが15個反復配列したDNA結合ドメインを備え、かつN末端にペプチドタグを、C末端に蛍光タンパク質(EGFPなど)又は発光タンパク質(cyan Nano-Lanternなど)(Takai et al., PNAS, 2015, vol.112, p.4352-4356.)を付加したタンパク質を作製した。
可視化プローブとして用いたGFP融合タンパク質の構造の模式図を図1に示す。当該GFP融合タンパク質は、TAL−repeatを反復配列したDNA結合ドメインを含み、N末端にペプチドタグ、C末端にGFPタンパク質が連結されたタンパク質である。
作製したTALE改変体の核酸塩基への結合性は、細胞内での発光タンパク質orange Nano-Lantern(Takai et al., ibid)を用いたレポーターアッセイ法及びin vitroでのELISA法によって測定した。ELISA法には、各タンパク質のC末端に融合させた発光タンパク質を用いた。
4種類の塩基に対して非選択的に結合するTAL−repeatからなるDNA結合ドメインをEGFP融合タンパク質として生細胞に導入し、当該ドメインが、オープンクロマチン構造を認識するプローブとして使用できるかを調べた。この際に、TAL−repeatの反復個数の異なるDNA結合ドメインを導入して、TAL−repeatの反復回数の違いがオープンクロマチン構造との結合へ与える影響を調べた。
非選択的結合性TAL−repeatが複数個反復配列されたDNA結合ドメインが、核内のどの構造を標識しているのかを調べるために、従来のエピゲノム解析において様々なゲノム構造の標識に使用されている標識法と比較した。従来の標識法としては、核染色、各種の修飾ヒストンを免疫染色する方法、及びATAC−see法(非特許文献6)とを用いた。
これとは独立して、ChrocodiLEを発現させたHeLa細胞を固定し、一次抗体として抗H3K4me3抗体、抗H3K27ac抗体、抗H3K9me3抗体、又は抗H3K27me3抗体を用い、二次抗体として赤色蛍光物質で標識された二次抗体を用いて、それぞれの修飾ヒストンを蛍光免疫染色した。H3K4me3及びH3K27acは、主にオープンクロマチンに存在しているヒストンの修飾型であり、H3K9me3及びH3K27me3は、主に凝集クロマチンに存在しているヒストンの修飾型である。
実施例1で作製されたChrocodiLe(非選択的結合性TAL−repeatが15個繰り返して連結したDNA結合ドメインを持つタンパク質)を蛍光タンパク質EGFPと融合させたChrocodiLE−EGFPをコードする遺伝子を、ROSA26遺伝子座にノックインしたトランスジェニックマウス(以下、「ChrocodiLE−Tgマウス」ということがある。)を作製した。ChrocodiLE−EGFPは、ChrocodiLEをコードする塩基配列(配列番号4)とEGFPをコードする塩基配列を連結して作製した。トランスジェニックマウスの作製は、阿部らの方法(非特許文献7)に準じて行った。
実施例1で作製されたChrocodiLe(非選択的結合性TAL−repeatが15個繰り返して連結したDNA結合ドメインを持つタンパク質)を蛍光タンパク質GFPと融合させたChrocodiLE−GFPをコードする遺伝子を挿入したトランスジェニック線虫(以下、「ChrocodiLE−Tg線虫」ということがある。)を作製した。ChrocodiLE−Tg線虫の作製は、MosSCI法により行った。発現ベクターは、pCFJ150−pDESTttTi5605[R4−R3](Plasmid#19329、Addgene社製)に、pJA252(Plasmid#21512、Addgene社製)由来のmex5(プロモーター)とpCM1.36(Plasmid#17249)由来のtbb2(3’UTR)との間にChrocodiLE−GFPをコードする遺伝子を挿入したフラグメントを挿入することにより作製した。
Claims (13)
- 3個以上のTAL−repeatが繰り返し連結されたDNA結合ドメインを含有し、塩基配列非依存的に核酸に結合することを特徴とする、核酸結合性タンパク質。
- 前記TAL−repeatのRVD配列が、HT、RS、又はHSである、請求項1に記載の核酸結合性タンパク質。
- 前記DNA結合ドメインにおける前記TAL−repeatの繰り返し数が、3個以上35個未満である、請求項1又は2に記載の核酸結合性タンパク質。
- 前記DNA結合ドメインは、同一アミノ酸配列からなる前記TAL−repeatが繰り返し連結されている、請求項1〜3のいずれか一項に記載の核酸結合性タンパク質。
- 前記DNA結合ドメインが、前記TAL−repeatのRVD配列がHT、RS、又はHSであるように改変されたTALEのDNA結合ドメインである、請求項1〜4のいずれか一項に記載の核酸結合性タンパク質。
- 前記DNA結合ドメインに含まれている前記TAL−repeatは、キサントモナス属細菌由来のTALEのTAL−repeat、又は前記TAL−repeatのRVD以外の領域にアミノ酸変異が導入されているTAL−repeatである、請求項1〜5のいずれか一項に記載の核酸結合性タンパク質。
- 前記DNA結合ドメインを含有するタンパク質と蛍光タンパク質とが、直接又は間接的に結合したタンパク質である、請求項1〜6のいずれか一項に記載の核酸結合性タンパク質。
- 請求項1〜7のいずれか一項に記載の核酸結合性タンパク質からなり、オープンクロマチン構造と選択的に結合する、タンパク質プローブ。
- 請求項1〜7のいずれか一項に記載の核酸結合性タンパク質をコードする塩基配列を含有する、核酸分子。
- 請求項9に記載の核酸分子が組込まれており、宿主細胞において、請求項1〜7のいずれか一項に記載の核酸結合性タンパク質を発現し得る、発現ベクター。
- 生細胞に、核酸結合性タンパク質をコードする遺伝子を導入する工程を有し、
前記核酸結合性タンパク質が、3個以上のTAL−repeatが繰り返し連結されたDNA結合ドメインと蛍光タンパク質とを含むタンパク質であり、
前記DNA結合ドメインが、塩基配列非依存的に核酸と結合することを特徴とする、生細胞中のオープンクロマチンを蛍光標識する方法。 - 請求項1〜7のいずれか一項に記載の核酸結合性タンパク質をコードする遺伝子が導入された、形質転換細胞(但し、ヒトを構成する細胞を除く)。
- 請求項1〜7のいずれか一項に記載の核酸結合性タンパク質をコードする遺伝子が導入された、形質転換非ヒト動物。
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