JP2017513527A - ポリエピトープタンパク質を得る方法とこの方法を具体化するためのdnaベクター - Google Patents
ポリエピトープタンパク質を得る方法とこの方法を具体化するためのdnaベクター Download PDFInfo
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- JP2017513527A JP2017513527A JP2017507091A JP2017507091A JP2017513527A JP 2017513527 A JP2017513527 A JP 2017513527A JP 2017507091 A JP2017507091 A JP 2017507091A JP 2017507091 A JP2017507091 A JP 2017507091A JP 2017513527 A JP2017513527 A JP 2017513527A
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Abstract
Description
a) エピトープをコードする平滑末端のDNA配列をクローン化して、上記で定義されたベクター内に、エンドヌクレアーゼSmaIにより認識される部位で挿入するか、又は、エピトープをコードする突出末端のDNA配列をクローン化して、上記で定義されたベクター内に、SapIエンドヌクレアーゼにより認識される部位で挿入する。場合により、コンカテマー形成効率を向上させるために、SapIで消化されたベクターへの添加に先立ち、一方向性の消化を確実にするよう、突出末端を有するDNA配列の予備ライゲーションを行うことができる。
b)得られたベクターを細菌宿主中で増幅させ、単離し、IISサブタイプ制限SapIエンドヌクレアーゼで消化し、その後、エピトープをコードするDNA配列を含む単離された断片を、コンカテマーへのインサートの一方向性のライゲーションを確実にするよう、一本鎖突出末端を備えるように修飾する。
c)単離した断片をオートライゲーションさせる。
d)オートライゲーション産物を、サブタイプIIS制限SapIエンドヌクレアーゼにより認識される部位で、請求項1〜4に定義したDNAベクター中にクローン化する、及び
e)得られたベクターを細菌宿主の形質転換に使用し、その後ポリエピトープタンパク質を発現させ、単離する、
上記方法において、ポリエピトープタンパク質の大きさを増大させるため、段階e)を実行する前に段階b)からd)を繰り返す。
図2に示した実施形態において、発明者らは、pAMPベクターの第一のシリーズを、p15A複製開始点を有するベクター骨格に基づいて設計した。設計されたベクターのうち、発明者らは、pAMP1-A(6ヒスチジン残基の融合タグを含まない)と、pAMP1-HisA(6ヒスチジン残基の融合タグを含む)とを構築した。さらには、pAMPベクターシリーズは、λファージPRの制御下でタンパク質を高発現する選択肢と、効率的な金属アフィニティクロマトグラフィーのプロトコルを使用することにより、ポリエピトープタンパク質の単離を可能にするHis6タグによる融合の選択肢を付して構築された。
n kit);レーン2-精製HBV13mer調製物;レーン3-抗6ヒスチジン残基タグ(Merk)抗体によるウエスタンブロット検出。
Claims (9)
- 配列、SapIによって認識される二つの収束性DNA配列を含む増幅モジュール、及び、それらの間に見出され、インサート中にSmaIによって認識されるクローニングイン(cloning-in)部位を含むDNA配列を包含し、好ましくは、前記増幅モジュールは、配列:GCTCTTCACCCGGGCCCAGAAGAGCを含む、DNAベクター。
- タンパク質発現ベクターであって、更に複製開始点(好ましくはp15A)、抗生物質抵抗性遺伝子(好ましくはクロラムフェニコール)、転写プロモーター(好ましくはλバクテリオファージのPR)、リプレッサー遺伝子(好ましくはcl857ts)、翻訳開始シグナル、及び場合により6ヒスチジン残基をコードする配列及び翻訳停止シグナルをコードする配列を含む、請求項1に記載のDNAベクター。
- 配列1〜6の中から選択される配列を有する、請求項1に記載のDNAベクター。
- 配列7を有する、請求項1に記載のDNAベクター。
- a) エピトープをコードする平滑末端のDNA配列をクローン化して、請求項1〜4に記載のDNAベクター内に、SmaIにより認識される部位で挿入する、
b)得られたベクターを細菌宿主中で増幅させ、単離してSapIで消化し、その後、エピトープをコードするDNA配列を含む単離した断片を、コンカテマーへのインサートの一方向性のライゲーションを促進する、一本鎖突出末端を備えるように修飾する、
c)単離した断片をオートライゲーションさせる。
d)オートライゲーション産物を、SapIにより認識される部位で、請求項1〜4に記載のDNAベクター中にクローン化する、及び
e)得られたベクターを細菌宿主の形質転換に使用し、その後ポリエピトープタンパク質を発現させ、単離する、
方法であって、ポリエピトープタンパク質の大きさを増大させるため、段階e)を実行する前に段階b)からd)を繰り返すことを特徴とする、ポリエピトープタンパク質を得る方法。 - エピトープがHBVエピトープであり、好ましくは合成配列9によりコードされる、請求項5に記載の方法。
- 増幅されたモノマー断片は、異なるタンパク質又は同じタンパク質の異なる領域に由来し、好ましくは合成配列にコードされる様々なエピトープを含む、請求項5に記載の方法。
- ポリエピトープタンパク質が、その精製を促進する配列、特に6ヒスチジン残基の配列を含む融合タグを更に含み、段階e)において実施される単離が、金属アフィニティクロマトグラフィー(好ましくは固定化ニッケル残基)、好ましくはタンパク質サンプルの加熱、ポリエチレンイミンを使用した分画、硫酸アンモニウムによる塩析、及び分子ふるいゲルクロマトグラフィーから成る群から選択される更なる精製段階を包含する、請求項5に記載の方法。
- 段階e)において、ポリエピトープタンパク質が、巨大分子担体、特に微生物、細胞、細菌、バクテリオファージ、ウイルス、不完全なウイルス粒子、自己凝集タンパク質、又はナノ粒子から、好ましくはT7バクテリオファージにおけるPhage Displayシステムから選択される一つである、
請求項5に記載の方法。
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