JP4505452B2 - 酵母におけるhpv31l1の最適化発現 - Google Patents
酵母におけるhpv31l1の最適化発現 Download PDFInfo
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- JP4505452B2 JP4505452B2 JP2006507439A JP2006507439A JP4505452B2 JP 4505452 B2 JP4505452 B2 JP 4505452B2 JP 2006507439 A JP2006507439 A JP 2006507439A JP 2006507439 A JP2006507439 A JP 2006507439A JP 4505452 B2 JP4505452 B2 JP 4505452B2
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Description
本発明は、子宮頸癌に関連づけられているHPV31 L1遺伝子により発現されるタンパク質産物に対する免疫を惹起または増強するための組成物および方法に関する。特に、本発明は、酵母により認識される内部転写終結シグナルを含有しない、HPV31 L1タンパク質をコードするポリヌクレオチドを提供する。また、酵母細胞内での高レベル発現に関してコドン最適化された、HPV31 L1をコードする合成ポリヌクレオチドも提供する。本発明は更に、HPV31ウイルス様粒子(VLP)を提供し、HPV疾患またはHPV関連癌の予防および/または治療用の免疫原性組成物およびワクチンにおける該VLPの使用を開示する。
ほとんどの子宮頸癌は、特定の発癌型のヒトパピローマウイルス(HPV)の感染に関連している。本発明は、発癌性HPV型の遺伝子により発現されるタンパク質産物に対する免疫を惹起または増強する組成物および方法に関する。特に、本発明は、HPV31 L1およびHPV31ウイルス様粒子(VLP)をコードする合成ポリヌクレオチドを提供し、HPV関連癌の予防および/または治療用の免疫原性組成物およびワクチンにおける該ポリヌクレオチドおよびVLPの使用を開示する。
HPV31 L1野生型配列は既に記載されている(Goldsboroughら,Virology 171(1):306−311(1989);Genbankアクセッション番号J04353)。しかし、臨床分離体から得たDNA間に若干の配列変異を見出すことは珍しいことではない。代表的なHPV31 L1野生型配列を単離するために、HPV31 DNAを含有することが既に示されている3つの臨床サンプルからDNAを単離した。Taq DNAポリメラーゼおよび以下のプライマーを使用するポリメラーゼ連鎖反応(PCR)において、HPV31 L1配列を増幅した:
酵母にとって好ましいコドンは既に記載されている(SharpおよびCowe,Yeast 7:657−678(1991))。まず、ヌクレオチド697−1249に相当するHPV31 L1の中央部を、酵母にとって好ましいコドンを使用して改変した。改変に用いた方法は、同じアミノ酸配列を維持しながら酵母にとって好ましいコドン配列でヌクレオチドを置換する、改変すべき領域に及ぶ長い重複するセンスおよびアンチセンスオリゴマーを設計するものであった。該PCR反応においては鋳型DNAの代わりにこれらのオリゴマーを使用した。追加的な増幅プライマーを設計し、それらを使用して、Pfu DNAポリメラーゼ(Stratagene,La Jolla,CA)により鋳型オリゴマーから改変体配列を増幅した。増幅のための最適条件は部位特異的なものであったが、ほとんどの場合には、以下に類似した方法を用いた:94℃で1時間の初期変性工程およびそれに続く、95℃で30秒間の変性、55℃で30秒間のアニーリング、72℃で3.5分間の伸長の15〜25サイクル、およびそれに続く72℃で10分間の最終伸長、および4℃での維持。
ガラクトース誘導によりHPV31 L1を発現するよう誘導された、形質転換酵母の細胞ペレットを氷上で解凍し、1mlの冷DEPC処理水に懸濁させた。細胞を遠心分離によりペレット化し、得られた上清を除去した。ついで細胞ペレットを400μlのTES(10mM Tris pH7.0,10mM EDTAおよび0.5% SDS)に再懸濁させた。等容量のAEバッファー飽和フェノール(50mM NaOAcおよび10mM EDTA)を加えた。該チューブを10秒間ボルテックスし、10分ごとに混合しながら65℃で50分間加熱した。ついで該チューブを氷上で5分間配置し、ついで4℃で5分間遠心分離した。上清を集め、無菌チューブに移した。追加的な400μlのフェノールを加え、該チューブをボルテックスし、氷上に5分間配置し、遠心分離した。上清を無菌チューブに移し、400μlのクロロホルムを加え、混合し、遠心分離した。上清を再び集め、無菌チューブに移し、1mlの100% EtOHのほかに40μlの3M 酢酸Na(pH5.2)を加えた。該チューブをドライアイス上に1時間配置し、ついでそれを高速で遠心分離してRNAをペレット化した。該RNAを70% EtOHで1回洗浄し、風乾させた。ついで該RNAを100μlのDEPC処理水に懸濁させ、65℃に5分間加熱して溶解した。A260/280が1.7〜2.0である場合にA260測定値1=40μg/ml RNAという仮定により、サンプル中のRNAの濃度を測定するために分光光度測定を行った。
31 L1野生型を発現する酵母の初期分析は、HPV31 L1タンパク質の発現収率が予想より相当低いことを示唆した。該低発現が、転写レベルの問題により生じたのか翻訳レベルの問題により生じたのかを判定するために、HPV31 L1転写産物のノーザンブロット分析を行った。転写サイズを比較するために、同一ゲル上で、HPV16 L1を発現する酵母からのRNAが、HPV31 L1を発現する酵母からのRNAと共に移動したゲルから、ノーザンブロットを作製した。
OD600=10と等価な、ガラクトースにより誘導された培養物の凍結酵母細胞ペレットを、氷上で解凍し、2mM PMSFを含有する300μlのPCバッファー(100mM Na2HPO4および0.5M NaCl,pH7.0)に懸濁させた。酸で洗浄した0.5mmガラスビーズを加えた(〜0.5g/チューブ)。該チューブを4℃で15分間ボルテックスした。7.5μlの20% TritonX100を加え、ボルテックスを4℃で5分間反復した。該チューブを氷上に15分間配置し、ついで4℃で15分間遠心分離した。上清を無菌微小遠心管に移し、−70℃で保存した。
ガラクトース誘導後のHPV31 L1タンパク質の発現を確認するために、各HPV31 L1構築物についての20〜40個の単離された酵母コロニーからの全酵母タンパク質抽出物をウエスタンブロットにより分析した。
HPV31 L1を発現する酵母細胞を種々の方法(回転チューブ培養、振とうフラスコおよび発酵槽など)により増殖させた。該酵母を細胞溶解し、タンパク質抽出物を調製して、全タンパク質1mg当たりで産生されたHPV31 L1ウイルス様粒子(VLP)の量を測定した。HPV31 L1 VLP発現を示すために、各全酵母タンパク質抽出物の一部を捕捉ラジオイムノアッセイ(RIA)により分析した。
HPV31 L1タンパク質が実際に自己集合して五量体L1カプソマー(これは今度は、ウイルス様粒子に自己集合する)を形成したことを示すために、部分的に精製された31 L1全改変体タンパク質抽出物を透過型電子顕微鏡検査(TEM)に付した。酵母を小規模発酵で増殖させ、ペレット化した。該ペレットを精製処理に付した。L1タンパク質の発現および精製操作における保持を示すために、ペレットおよび清澄化酵母抽出物を免疫ブロットにより分析した。ついで清澄化酵母抽出物を45% スクロースクッション上の遠心分離に付し、得られたペレットをTEM分析のためにバッファーに懸濁させた(図6を参照されたい)。この粗サンプル中の球状粒子の直径は30〜60nmであり、いくつかの粒子はカプソマーの規則的配置を示していることを、結果は示している。
Claims (9)
- HPV31 L1タンパク質をコードするヌクレオチド配列からなる核酸分子であって、該ヌクレオチド配列は配列番号2又は3で表されるヌクレオチド配列である核酸分子。
- 請求項1記載の核酸分子を含んでなるベクター。
- 請求項2記載のベクターを含んでなる宿主細胞。
- 宿主細胞が、サッカロミセス・セレビシエ(Saccharomyces cerevisiae)、ハンゼヌラ・ポリモルファ(Hansenula polymorpha)、ピチア・パストリス(Pichia pastoris)、クリーベルミセス・フラジリス(Kluyvermyces fragilis)、クルベロミセス・ラクチス(Kluveromyces lactis)およびシゾサッカロミセス・ポンベ(Schizosaccharomyces pombe)よりなる群から選ばれる、請求項3記載の宿主細胞。
- 宿主細胞がサッカロミセス・セレビシエ(Saccharomyces cerevisiae)である、請求項4記載の宿主細胞。
- HPV31の組換えL1タンパク質を含むHPV31のウイルス様粒子(VLP)であって、該L1タンパク質は請求項1に記載の核酸分子によってコードされるものであるウイルス様粒子(VLP)。
- (a)請求項1に記載の核酸分子で酵母細胞を形質転換し、
(b)該核酸分子の発現を可能にする条件下、該形質転換酵母細胞を培養して組換えパピローマウイルスタンパク質を得、
(c)該組換えパピローマウイルスタンパク質を単離してHPV31のVLPを得ることを含んでなる、HPV31のVLPの製造方法。 - 酵母細胞が、サッカロミセス・セレビシエ(Saccharomyces cerevisiae)、ハンゼヌラ・ポリモルファ(Hansenula polymorpha)、ピチア・パストリス(Pichia pastoris)、クリーベルミセス・フラジリス(Kluyvermyces fragilis)、クルベロミセス・ラクチス(Kluveromyces lactis)およびシゾサッカロミセス・ポンベ(Schizosaccharomyces pombe)よりなる群から選ばれる、請求項7記載の方法。
- 酵母細胞がサッカロミセス・セレビシエ(Saccharomyces cerevisiae)である、請求項8に記載の方法。
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