JP5461423B2 - 新規風疹e1エンベロープタンパク質変異体および抗風疹抗体の検出におけるその使用 - Google Patents
新規風疹e1エンベロープタンパク質変異体および抗風疹抗体の検出におけるその使用 Download PDFInfo
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Description
a)1つのジスルフィド架橋はCys 225およびCys 235(C13-C14)の間で形成されており、もう1つのジスルフィド架橋はCys 349およびCys 352(C17-C18)の間で形成されており、または
b)1つのジスルフィド架橋はCys 225およびCys 235(C13-C14)の間で形成されており、もう1つのジスルフィド架橋はCys 368およびCys 401(C19-C20)の間で形成されている。
a)1つのジスルフィド架橋はCys 176およびCys 185(C11-C12)の間で形成されており、もう1つのジスルフィド架橋はCys 225およびCys 235(C13-C14)の間で形成されており、または
b)1つのジスルフィド架橋はCys 176およびCys 185(C11-C12)の間で形成されており、もう1つのジスルフィド架橋はCys 349およびCys 352(C17-C18)の間で形成されており、または
c)1つのジスルフィド架橋はCys 176およびCys 185(C11-C12)の間で形成されており、もう1つのジスルフィド架橋はCys 368およびCys 401(C19-C20)の間で形成されている。
a)1つのジスルフィド架橋はCys 225およびCys 235の間で形成されており、もう1つのジスルフィド架橋はCys 349およびCys 352の間で形成されており、または
b)1つのジスルフィド架橋はCys 225およびCys 235の間で形成されており、もう1つのジスルフィド架橋はCys 368およびCys 401の間で形成されている。
a)1つのジスルフィド架橋はCys 176およびCys 185の間で形成されており、もう1つのジスルフィド架橋はCys 225およびCys 235の間で形成されており、または
b)1つのジスルフィド架橋はCys 176およびCys 185の間で形成されており、もう1つのジスルフィド架橋はCys 349およびCys 352の間で形成されており、または
c)1つのジスルフィド架橋はCys 176およびCys 185の間で形成されており、もう1つのジスルフィド架橋はCys 368およびCys 401の間で形成されている。
a)風疹E1抗原とペプチジルプロリルイソメラーゼクラスシャペロンまたはシャペロニング結合活性を尚も有するその機能性断片とを含む融合タンパク質をコードする遺伝子を含有する前記発現ベクターで形質転換された宿主細胞を培養し、
b)該融合タンパク質をコードする遺伝子を発現させ、
c)該融合タンパク質を精製し、
d)可溶性かつ免疫反応性(すなわち、抗原性)コンホメーションへリフォールディングする工程を含む。
a)体液サンプルを本発明の風疹E1抗原と混合することにより免疫反応混合物を形成させ、
b)該体液サンプル中に存在する該風疹E1抗原に対する抗体が該風疹E1抗原と免疫反応して免疫反応産物を形成するのを可能にするのに十分な時間にわたり、免疫反応混合物を維持し、
c)該免疫反応産物のいずれかの存在を検出することを含む、単離されたサンプルにおける風疹に特異的な抗体の検出方法に関する。
a)1つのジスルフィド架橋はCys 225およびCys 235の間で形成されており、もう1つのジスルフィド架橋はCys 349およびCys 352の間で形成されており、または
b)1つのジスルフィド架橋はCys 225およびCys 235の間で形成されており、もう1つのジスルフィド架橋はCys 368およびCys 401の間で形成されており、抗原a)が最も好ましい。
a)1つのジスルフィド架橋はCys 176およびCys 185の間で形成されており、もう1つのジスルフィド架橋はCys 225およびCys 235の間で形成されており、または
b)1つのジスルフィド架橋はCys 176およびCys 185の間で形成されており、もう1つのジスルフィド架橋はCys 349およびCys 352の間で形成されており、または
c)1つのジスルフィド架橋はCys 176およびCys 185の間で形成されており、もう1つのジスルフィド架橋はCys 368およびCys 401の間で形成されている。
以下の実施例は本発明を例示するものである。
風疹株Therien(Dominguezら, 1990, Virology 177, 225-238)からのE1前駆体タンパク質の配列をSwissProtデータベース(登録番号P07566)から取り出した。風疹E1(aa 1-432)をコードする合成遺伝子をMedigenomix(Martinsried, Germany)から購入した。
ジスルフィド架橋を含有しないもの(システイン残基を欠く対照E1変異体):
配列番号2に示すE1 169-432。
E1 169-432 (C11-C12), E1 201-432 (C13-C14), E1 201-432 (C17-C18), E1 201-432 (C19-C20)。
配列番号3に示すE1 201-432 (C17-C18, C19-C20)。
配列番号4に示すE1 201-432 (C13-C14, C17-C18)。
配列番号5に示すE1 201-432 (C13-C14, C19-C20)。
配列番号6に示すE1 169-432 (C11-C12, C13-C14)。
配列番号7に示すE1 169-432 (C11-C12, C17-C18)。
配列番号8に示すE1 169-432 (C11-C12, C19-C20)。
三重ジスルフィド架橋:
配列番号11に示すE1 201-432 (C13-C14, C17-C18, C19-C20)。
配列番号9に示すE1 169-432 (C11-C12, C17-C18, C19-C20)。
配列番号10に示されているE1 169-432 (C11-C12, C13-C14, C17-C18)。
実質的に同じプロトコールに従い、全てのE1シャペロン融合タンパク質を精製し、リフォールディングさせた。発現プラスミドを含有する大腸菌(E. coli)BL21(DE3)細胞をLB培地+ カナマイシン(30μg/ml)内で、OD600が1になるまで増殖させ、37℃の増殖温度でイソプロピル-β-D-チオガラクトシド(IPTG)を最終濃度1mMまで加えることによりサイトゾル過剰発現を誘導した。誘導の4時間後、細胞を遠心分離(5000×gで20分間)し、凍結させ、-20℃で保存した。細胞溶解のために、該凍結ペレットを100mMリン酸ナトリウム(pH8.0)、7.0M GuHCl、10mM イミダゾールに室温で再懸濁させ、得られた懸濁液を2時間攪拌して細胞溶解を完了させた。遠心分離および濾過の後、前記細胞溶解バッファー中で予め平衡化されたNi-NTA(ニッケル-ニトリロ-トリアセタート)カラム上にライセートをアプライした。不完全なジスルフィド架橋およびジスルフィドシャフリングを避けるために、金属キレート化カラムに適合しうる還元剤として5mM TCEPを洗浄バッファー中に加えた。過剰の洗浄工程(>20カラム容量の細胞溶解バッファー + TCEP)の後、マトリックス結合タンパク質のコンホメーションリフォールディングを誘導するために、該カオトロピック細胞溶解バッファーを50mMリン酸ナトリウム(pH7.8)、100mM塩化ナトリウム、5mM TCEPで置換した(残留GuHClがカオトロピック濃度で存在しないことが保証されるよう、少なくとも10カラム容量のリフォールディングバッファーをアプライした)。ついで、酸化的フォールディング(すなわち、システイン残基の酸化的架橋)を、50mMリン酸ナトリウム pH7,8、100mM塩化ナトリウムでの洗浄により誘導した。二価Ni2+イオンの有効濃度が高いため、マトリックス結合融合タンパク質内のジスルフィド架橋の形成は非常に速い過程である。溶出前に、約50kDaの見掛け分子量を有する汚染タンパク質を除去するために、イミダゾール濃度を55mMまで上昇させた。ついで、50mMリン酸ナトリウム(pH7.8)、100mM塩化ナトリウム中の55mMから500mMまでのイミダゾール勾配を適用することにより、ネイティブ融合タンパク質を溶出した。タンパク質含有画
分を純度に関して評価し(SDS-PAGEによる判定で>95%)、プールした。最後に、該タンパク質をサイズ排除クロマトグラフィーに付し、見掛け上の二量体画分をプールし、濃縮し、その分光学的特性に関して評価した。
組換え風疹エクトドメインのリシンε-アミノ基を約10mg/mlのタンパク質濃度で、それぞれN-ヒドロキシ-スクシンイミド活性化ビオチンおよびルテニウム標識により修飾した。標識/タンパク質のモル比は、それぞれの融合タンパク質に応じて1:1から5:1まで様々となった。反応バッファーは150mM リン酸ナトリウム(pH8.0)、50mM NaCl、1mM EDTAであった。反応を室温で15分間行い、緩衝化L-リシンを最終濃度10mMまで加えることにより停止させた。該カップリング反応の後、該粗タンパク質コンジュゲートをゲル濾過カラム(Superdex 200 HI Load)に通すことにより未反応遊離標識を除去した。
種々の融合タンパク質の免疫学的反応性を自動Elecsys(登録商標)2010分析装置(Roche Diagnostics GmbH)において評価した。二重抗原サンドイッチ形態で測定を行った。このとき、ビオチン-コンジュゲート(すなわち捕捉抗原)はストレプトアビジンコート化磁気ビーズの表面上に固定化され、一方、検出抗原はシグナリング部分として錯化ルテニウムカチオンを有する。Elecsys(登録商標)2010におけるシグナル検出は電気化学発光に基づくものである。
その抗原性のほかに、SS-E1融合タンパク質のオリゴマー状態、溶解度および安定性が診断目的のその適合性を決定する。長さの最適化のために、E1 N断片(アミノ酸1-314)およびC断片(アミノ酸315-432)のシステイン非含有変異体をクローニングし、発現させ、精製した(縦列SlyD*との融合タンパク質として)。組換え風疹エクトドメイン断片の見掛け上のオリゴマー状態を明らかにするために、風疹E1 N断片およびC断片をSuperdex 200 HR 10/30カラム上の分析用ゲル濾過に付した。ランニングバッファーは50mM リン酸カリウム(pH 7.5)、100 mM KClであった。約200μlのSS-E1溶液(タンパク質濃度約1.0mg/ml)をSECカラム上にアプライし、溶出を280nmでの吸収によりモニターした。E1 N断片1-55、1-104、1-133および1-142ならびにE1 C断片169-432、201-432、260-432および315-432は全て、Superdex 200カラムの分離範囲内で溶出した。SlyD*-SlyD*-E1変異体は全て、見掛け上の二量体を示唆する、予想分子サイズの約2倍の位置で溶出した。
種々の融合タンパク質の免疫学的反応性を自動Elecsys(登録商標)2010分析装置(Roche Diagnostics GmbH)において評価した。二重抗原サンドイッチ形態で測定を行った。そこでは、ビオチン-コンジュゲート(すなわち捕捉抗原)はストレプトアビジンコート化磁気ビーズの表面上に固定化され、一方、検出抗原はシグナリング部分として錯化ルテニウムカチオンを含有する。Elecsys(登録商標)2010におけるシグナル検出は電気化学発光に基づくものである。特異的免疫グロブリンアナライトの存在下では、発色性ルテニウム錯体は固相へ架橋され、白金電極における励起の後に620nmの光を発する。シグナル出力は任意光単位のものである。ババリア(Bavarian)赤十字の血清パネルからの抗風疹IgG陽性サンプルを用いて測定を行った。結果を表1に示す。
EP-A-1780282から公知のシステインCys 349-Cys 352(C17-C18)およびCys 368-Cys 401(C19-C20)の間に2つのジスルフィド架橋を形成する3つの異なる風疹E1変異体(左欄)、Cys 225-Cys 235(C13-C14)およびCys 349-Cys 352(C17-C18)の間に2つのジスルフィド架橋を含有する本発明の変異体(中央欄)、ならびにシステインCys 225-Cys 235(C13-C14)、Cys 349-Cys 352(C17-C18)およびCys 368-Cys 401(C19-C20)の間に3つのジスルフィド架橋を含有する変異体(右欄)の評価。
表3および4に示されている結果は、それぞれ表1および2の結果を証明している。すなわち、風疹E1抗原が2つのジスルフィド架橋の組合せを有すると直ちに、相対シグナルが実質的に増加し、一方、E1抗原がジスルフィド架橋をただ1つ含有するか又はシステイン残基を完全に欠く場合には、シグナルは多少劣る。
Claims (10)
- アミノ酸201-432を含み、天然風疹E1抗原のアミノ酸143-164および454-481に対応する配列を欠き、2つのジスルフィド架橋を含有する風疹E1抗原であって、
1つのジスルフィド架橋はCys 225およびCys 235(C13-C14)の間で形成されており、もう1つのジスルフィド架橋はCys 349およびCys 352(C17-C18)の間で形成されており、さらに、該2つのジスルフィド架橋を形成するシステイン残基以外の、Cys 242、Cys 287、Cys 368およびCys 401を含む、全システイン残基がアラニンまたはセリンに置換されている、風疹E1抗原。 - 抗原がペプチジル-プロリル-イソメラーゼクラスのシャペロンに融合されている、請求項1記載の風疹E1抗原。
- 請求項1記載の風疹E1抗原をコードするヌクレオチド配列を含んでなる、風疹E1抗原をコードする組換えDNA分子。
- 請求項3記載の風疹E1抗原をコードする組換えDNA分子であって、その上流に、ペプチジル-プロピル-イソメラーゼクラスのシャペロンをコードする少なくとも1つのヌクレオチド配列が存在する、組換えDNA分子。
- 機能しうる形で連結された、請求項3または4記載の組換えDNA分子を含んでなる発現ベクター。
- 請求項5記載の発現ベクターで形質転換された、宿主細胞。
- 可溶性かつ免疫反応性風疹E1抗原融合タンパク質の製造方法であって、
a)風疹E1抗原とペプチジル-プロリル-イソメラーゼクラスのシャペロンとを含む融合タンパク質をコードする組換えDNA分子を含んでなる請求項5記載の発現ベクターで形質転換されている、請求項6記載の宿主細胞を培養し、
b)該融合タンパク質を発現させ、
c)該融合タンパク質を精製し、
d)該融合タンパク質を可溶性かつ免疫反応性コンホメーションへリフォールディングさせる工程を含んでなる製造方法。 - a)体液サンプルを請求項1または2記載の風疹E1抗原と混合することにより免疫反応混合物を形成させ、
b)該体液サンプル中に存在する該風疹E1抗原に対する抗体が該風疹E1抗原と免疫反応して免疫反応産物を形成するのを可能にするのに十分な時間にわたり、該免疫反応混合物を維持し、
c)免疫反応産物の存在を検出する
ことを含んでなる、単離されたサンプルにおける風疹に特異的な抗体の検出方法。 - 単離されたサンプルにおける風疹に対する抗体の検出方法における、請求項1または2記載の風疹E1抗原の使用。
- 請求項1または2記載の風疹E1抗原を含有する、風疹に対する抗体の検出のための試薬キット。
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