JP5701484B2 - 毒素原性大腸菌に対する免疫原性組成物に基づく付着因子−腸毒素キメラ - Google Patents
毒素原性大腸菌に対する免疫原性組成物に基づく付着因子−腸毒素キメラ Download PDFInfo
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- JP5701484B2 JP5701484B2 JP2008550400A JP2008550400A JP5701484B2 JP 5701484 B2 JP5701484 B2 JP 5701484B2 JP 2008550400 A JP2008550400 A JP 2008550400A JP 2008550400 A JP2008550400 A JP 2008550400A JP 5701484 B2 JP5701484 B2 JP 5701484B2
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Description
本発明のこれらおよび他の目的は、免疫を誘導するためのワクチン成分として大腸菌付着因子ポリペプチドを利用することによって達成される。
本発明は、構造的に安定な、従って免疫活性の付着因子ポリペプチドの投与により抗付着性免疫応答を誘導するための方法および生物学的組成物に関する。本発明の組成物において考えられる付着因子としては、クラス5線毛からのもの、およびCS3からのもの(すなわち、CstH)が挙げられるが、これらに限定されない。付着因子(毒素原性大腸菌線毛および微細線維の遠位分子成分)は、宿主細胞への細菌付着のための有望なエフェクターである(非特許文献65)。従って、付着因子は、細菌の定着および病原性にとって重要である。
本発明をさらに十分に例証するために、CfaE、CFA/Iの小サブユニット、を含有する抗ETEC組成物の例を説明する。図1(A)を参照して、CfaEのコーディング配列の3’末端にヘアピンリンカーを遺伝子的に連結させることにより、構造的に安定なCfaEを構築した。リンカーのアミノ酸配列は、配列番号1、2および3によって記載する。その後、CfaBからのアミノ酸ドナー鎖(配列番号5に記載する)をそのリンカーの3’末端で連結させ、最後に、ヘキサヒスチジンタグをそのCfaBドナー鎖の3’末端で連結させた。その後、その構築物をpET24プラスミドに挿入し、大腸菌において発現させた。得られたポリペプチド(dscCfaEと呼ぶ)をニッケルまたはコバルト親和性およびカチオン交換クロマトグラフィーによって精製した。その組換えポリペプチドは、可溶性であり、安定していた。ゲル濾過に基づき、そのdscCfaEポリペプチドは単量体として存在し、CDスペクトル分析により、主としてβ鎖分子の存在と一致する結果を得た。
構築物を機能的に試験した。図1Aまたは図1Bにおける構築物を3μmラテックスビーズに吸着させ、ヒトまたはウシ赤血球に添加し、結果としてMRHAを誘導した。この観察は、CfaEがETECにおける付着因子である明瞭な証拠をもたらす。
易熱性腸毒素の活性の防止も防御に寄与しうるが、付着因子が下痢原性大腸菌に対する免疫の誘導に最も重要な成分である可能性は高い。線毛付着因子は本質的には不安定であり、隣接するサブユニットへのそれらの非共有結合的連結が無ければ分解されるため、本発明は、構造安定性を付与することにより付着因子の免疫原性の素質を有意に改善する。加えて、構造安定性付着因子の免疫原的有効度は、効力ある免疫原性とアジュバント活性の両方を有する腸毒素成分をキメラとして付着因子構築物に備えさせることにより、有意に改善される可能性が高い。
本発明の構築物は、下痢原性大腸菌に対する免疫応答および/または抗毒素免疫を誘導するためのワクチン成分として有用であると予想される。免疫の誘導方法は、次の段階を含む:
妥当な量の付着因子/毒素キメラを生産するために、生産および精製計画の開発を開示する。好ましい生産および精製手順の一例を提示するが、安定な免疫原性付着因子/毒素キメラ生成物を最終的に生じさせることができる他の方法を利用してもよい。
Claims (20)
- 毒素Aサブユニットポリペプチドにリンカーおよびドナー鎖ポリペプチド配列によって共有結合で連結されているCfaE大腸菌線毛付着因子ポリペプチドを含有する精製された融合タンパク質を含む免疫原性組成物であって、
前記リンカーは前記付着因子のC末端に共有結合で連結されており、
前記ドナー鎖は前記リンカーのC末端に共有結合で連結されており、
前記毒素Aサブユニットは前記ドナー鎖のC末端に共有結合で結合されており、
前記ドナー鎖は、配列番号5由来の8から20アミノ酸配列である、免疫原性組成物。 - 前記融合タンパク質は、前記毒素Aサブユニットポリペプチドと毒素Bサブユニットポリペプチドとの非共有結合性相互作用によって腸毒素様キメラに組み立てられる、請求項1に記載の免疫原性組成物。
- 前記毒素Aサブユニットは、コレラ毒素Aサブユニット、コレラ毒素A2サブユニット、大腸菌易熱性毒素Aサブユニット、大腸菌易熱性毒素A2サブユニットからなる群より選択される、請求項1に記載の免疫原性組成物。
- 前記大腸菌線毛付着因子のポリペプチドフラグメントは、付着因子ポリペプチドの単量体または重合体である、請求項1に記載の免疫原性組成物。
- 前記大腸菌線毛付着因子のポリペプチドフラグメントは、配列番号4の配列にコードされるポリペプチドである、請求項1に記載の免疫原性組成物。
- 前記リンカーは、配列番号1、配列番号2および配列番号3からなる群より選択されるアミノ酸配列から構成される、請求項1に記載の免疫原性組成物。
- 前記融合タンパク質は、配列番号6の配列を有するポリペプチドを含む、請求項1に記載の免疫原性組成物。
- 前記毒素Aサブユニットは、配列番号18、配列番号19、配列番号31、配列番号32、配列番号34および配列番号35からなる群より選択される配列を有するポリペプチドから構成される、請求項1に記載の免疫原性組成物。
- 前記毒素Bサブユニットは、コレラ毒素Bサブユニットまたは大腸菌易熱性毒素Bサブユニットである、請求項2に記載の免疫原性組成物。
- 前記融合タンパク質および前記毒素Bサブユニットは、単一の発現ベクターから発現される、請求項2に記載の免疫原性組成物。
- 前記毒素Bサブユニットは、配列番号20;配列番号21;配列番号22および配列番号23からなる群より選択される配列で示されるポリペプチド配列から構成される、請求項2に記載の免疫原性組成物。
- 前記毒素AサブユニットのN末端は、配列番号25または配列番号26で示される配列を含有する、請求項8に記載の免疫原性組成物。
- 請求項1から12のいずれか1項に記載の組成物であって、
a.前記組成物の1つ以上の構築物を含む免疫原の初回抗原刺激用量を投与する段階と、
b.免疫応答を惹起する、緩衝水溶液中の前記免疫原の50μgから1mgの単位用量範囲での初回抗原刺激用量の少なくとも1週間後に、第一用量での追加抗原刺激用量を投与する段階と、
を含む免疫応答を誘導する方法で用いるための組成物。 - 前記免疫応答は、ヒト細胞への毒素原性大腸菌線毛付着を阻害する、請求項13に記載の組成物。
- 前記免疫応答は、ヒトにおける下痢を軽減または予防する、請求項13に記載の組成物。
- 前記組成物は、皮下的に、皮膚を通して、筋肉内に、経口的に、経皮的にまたは経鼻的に投与される、請求項13に記載の組成物。
- 前記免疫原は、DNA発現系内にコードされ、弱毒化生菌ベクター内で発現される、請求項13に記載の組成物。
- 前記経口投与は、溶液、または腸溶性顆粒カプセルによる、請求項16に記載の組成物。
- 前記経皮投与は、ドライパッチによる、請求項16に記載の組成物。
- 前記弱毒化生菌ベクターが、大腸菌、赤痢菌属のメンバー、カンピロバクター属のメンバー、サルモネラ菌属のメンバー、およびビブリオ菌属のメンバーからなる群より選択される、請求項17に記載の組成物。
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