JP6302415B2 - ヒト上皮細胞増殖因子の製造方法 - Google Patents
ヒト上皮細胞増殖因子の製造方法 Download PDFInfo
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- C—CHEMISTRY; METALLURGY
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- C12P21/00—Preparation of peptides or proteins
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- Molecular Biology (AREA)
- Microbiology (AREA)
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Description
タバコエクステンシンシグナルペプチドと、53残基の成熟型ヒトEGFと、小胞体保留シグナルKDELとを連結させたポリペプチド(配列番号10)をコードする、改変された塩基配列からなるDNAを含むインサートDNA(配列番号9)は、GeneArt社(現Life Technologies社)に依頼し、化学合成により作製した。
上記で得た組換えTMV発現プラスミドDNAを鋳型として、Ambion mMessage mMachine kit(Life Technologies)を用いて転写反応を行なった。反応液組成は以下の通りとした。
カプシド形成反応後の反応液を用いて接種原を調製した。接種原の調製に用いるバッファー(GENEWARE(登録商標)Inoculation Buffer(GIB))は、以下の通りに調製した。
接種後12日間栽培した後、タバコ葉を収穫した。収穫した500gの葉は、抽出までの間、約45分間氷上に置いた。抽出用緩衝液(50mMトリス緩衝液(pH8.5)、10mM EDTA、1mM PMSF(Phenylmethylsulfonyl fluoride、プロテアーゼ阻害剤として)、0.1% Triton X-100)は、抽出作業まで4℃に冷蔵保存した。500g の葉に500mLの抽出用緩衝液を加えて、ジューサーで破砕抽出して、ガラス瓶に入れて氷液に保存した。この液を10,000gで10分間遠心して、その後のろ過の材料とした。遠心後の上清をMiracloth 及び30KDa PES Kvick flow UFカセット(0.1m2)でろ過することにより、ろ液中の大部分のタンパク質を除去してEGFを濃縮した(30KDaろ過液)。また、この30KDaろ過液を2KDa Hydrosart Sartorius カセット(0.1m2)でさらに90mLに濃縮した(2KDaろ過液)。さらに、各ろ過残渣を7倍量の抽出用緩衝液(計1,600mL)で洗浄し、洗浄液を回収した(30KDa残渣、及び2KDa残渣)。
接種後12日間栽培した後、タバコ葉を収穫した。収穫した1500gの葉は、抽出までの間、約45分間氷上に置いた。抽出用緩衝液(50mMトリス緩衝液(pH8.5)、10mM EDTA、1mM PMSF(Phenylmethylsulfonyl fluoride、プロテアーゼ阻害剤として)、0.1% Triton X-100)は、抽出作業まで4℃に冷蔵保存した。1500g の葉に1500mLの抽出用緩衝液を加えて、ジューサーで破砕抽出して、ガラス瓶に入れて氷液に保存した。この液を10,000gで10分間遠心して、その後のろ過の材料とした。遠心後の上清をMiracloth 及び30KDa PES Kvick flow UFカセット(0.1m2)でろ過することにより、ろ液中の大部分のタンパク質を除去してEGFを濃縮した。この30KDaろ過液に1.5Mになるように硫酸アンモニウムを加えて Phenyl Sepharose FFカラムに吸着させた後、5mMリン酸ナトリウム緩衝液(pH7.0)で溶出した。更に、この液に2.5Mになるように硫酸アンモニウムを加えて Phenyl Sepharose FFカラムに吸着させた後、5mMリン酸ナトリウム緩衝液(pH7.0)で溶出した。この液をNuviaQカラムを通しEGFを吸着させて、500mM塩化ナトリウムを加えたグリシン緩衝液(pH 10.0)で溶出した。これを試料として、SDS-PAGE・銀染色による純度の測定及び生物活性の測定を実施した。
Claims (13)
- 配列番号11に示す塩基配列を含む、成熟型ヒトEGFを植物細胞内で発現させるための核酸構築物。
- DNA構築物である請求項1記載の核酸構築物。
- RNAポリメラーゼプロモーター、ウイルスレプリカーゼcDNA、ウイルス移行タンパク質cDNA及びウイルス外被タンパク質cDNAと連結された形態にある、請求項2記載の核酸構築物。
- 前記ウイルスレプリカーゼ、移行タンパク質及び外被タンパク質がタバコモザイクウイルス由来である請求項3記載の核酸構築物。
- 請求項1ないし4のいずれか1項に記載の核酸構築物を含む発現ベクター。
- ウイルス発現ベクターである請求項5記載の発現ベクター。
- 請求項1記載の核酸構築物を含む組換えウイルス。
- 請求項7記載の組換えウイルスのゲノム又はウイルス粒子を植物体に接種し、ウイルス増殖後、該ウイルスから生産された成熟型ヒトEGFタンパク質分子を回収することを含む、ヒトEGFの製造方法。
- 請求項6記載の発現ベクターから組換えウイルスのゲノム又はウイルス粒子を調製し、該ウイルスゲノム又はウイルス粒子を植物体に接種し、ウイルス増殖後、該ウイルスから生産された成熟型ヒトEGFタンパク質分子を回収することを含む、ヒトEGFの製造方法。
- 植物体としてタバコを用いる請求項8又は9記載の方法。
- 成熟型ヒトEGFのN末側にタバコエクステンシンシグナルペプチドを、C末側に小胞体保留シグナルを付加したポリペプチドをコードするポリヌクレオチドであって、該ポリヌクレオチドの塩基配列は、配列番号11に示す塩基配列である、ポリヌクレオチド。
- 請求項11記載のポリヌクレオチドを含む組換えウイルス。
- 植物ウイルスである請求項12記載の組換えウイルス。
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JP2016172707A (ja) * | 2015-03-18 | 2016-09-29 | 株式会社UniBio | 植物体内で発現させた上皮細胞増殖因子の精製品の製造方法 |
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