JP2014534205A - 非アセチル化タンパク質からのアセチル化タンパク質の分離 - Google Patents
非アセチル化タンパク質からのアセチル化タンパク質の分離 Download PDFInfo
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K1/00—General methods for the preparation of peptides, i.e. processes for the organic chemical preparation of peptides or proteins of any length
- C07K1/14—Extraction; Separation; Purification
- C07K1/16—Extraction; Separation; Purification by chromatography
- C07K1/165—Extraction; Separation; Purification by chromatography mixed-mode chromatography
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
- C07K14/52—Cytokines; Lymphokines; Interferons
- C07K14/555—Interferons [IFN]
- C07K14/56—IFN-alpha
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Proteomics, Peptides & Aminoacids (AREA)
- Biochemistry (AREA)
- Biophysics (AREA)
- General Health & Medical Sciences (AREA)
- Genetics & Genomics (AREA)
- Medicinal Chemistry (AREA)
- Molecular Biology (AREA)
- Gastroenterology & Hepatology (AREA)
- Zoology (AREA)
- Toxicology (AREA)
- Analytical Chemistry (AREA)
- Peptides Or Proteins (AREA)
- Preparation Of Compounds By Using Micro-Organisms (AREA)
Abstract
Description
。
(a)発現系から生産され、可溶化およびリフォールディングされたインターフェロンを、疎水性相互作用クロマトグラフィーに供するステップであって、インターフェロンがアセチル化形態および非アセチル化形態を含むステップ、および
(b)ステップ(a)で得られたインターフェロンを、本明細書で言及した非アセチル化タンパク質からアセチル化タンパク質を分離する方法に供して、非アセチル化形態のインターフェロンを得ることができるステップ、
を含む。
<遺伝子クローニング、プラスミド設計および細胞培養>
IFN-α遺伝子クローニング、プラスミド設計およびコドン最適化を、組み換えDNA技術によって実施した。組み換えIFN-α-2aは、IFN-α-2aの遺伝子を含有するプラスミドPET30aを有するBL21(DE3)菌(細胞)において、不溶性封入体として発現させた。培養は、5L流加培養において、溶存酸素レベル30%で実施した。1mM IPTGで3時間誘導後、遠心分離によって細胞を培養液から回収した。細胞ペーストを20 mM Tris pH 7.4/ 0.5 mM EDTA緩衝液で洗浄し、その後、超音波処理によって細胞を破砕するために、同じ緩衝液で再懸濁した。IBを遠心分離によって収集した。
IBを適切な体積の50 mM Tris pH7.4/7.0 GdHCl/2% tween 80に溶解し、4 mg/mLのIFN-α-2aを得た。室温で1時間穏やかに撹拌し、完全に溶解した。タンパク質溶液を50 mM Tris pH7.4緩衝液で11倍に希釈した。不溶性のデブリスを、30分間の冷却遠心で除去した。
ジスルフィド酸化に先立ち、50 mM Tris pH7.4緩衝液中の1 mMヨードソベンゾエートを調製した。10μΜヨードソベンゾエートを、1時間ごとに5回タンパク質溶液に導入した(合計50μΜ)。タンパク質溶液を穏やかに撹拌しながら室温でインキュベートした。
1 mM EDTAおよび10 mMメチオニンをタンパク質溶液に加え、続いて固体硫酸アンモニウムを加えて1 Mとした。pHを酢酸でpH6.5に調節した。粒子を遠心分離および濾過で除去した後、クロマトグラフィー精製を以下の通り実施した。
Toyopearl Butyl-650M, 5x5 cm, 流速 25 ml/分、
緩衝液A: 20 mM NaPi pH 6.5/1.0M AmS04/l mM EDTA/ 10 mM メチオニン、
緩衝液B: 20 mM NaPi pH 6.5/1 mM EDTA/ 10 mM メチオニン。
5 mM酢酸アンモニウム緩衝液(pH6.5)を導入し、硫酸アンモニウムを最終伝導率15 mS/cm未満になるまで希釈した。クロマトグラフィー精製を以下の通り実施した。
Capto Adhere 2.6x6 cm、流速6.7 ml/分、
緩衝液C: 50% 酢酸を加えることによる、25 mM酢酸アンモニウム緩衝液(pH 6.5)、
緩衝液D: 5 mM 酢酸
IFN-α-2b生産を実施例1と同じやり方で実施した。IFN-α-2bの全体の収率を表2に示す。本質的にアセチル化アイソフォームを含まない、得られた画分をプールした。IFN-α-2bのクロマトグラムを図3に示す。得られた産物を、それぞれの純度を比較することによって評価した。SDS-PAGE分析の結果を図4に示す。アセチル化IFNの量は、封入体で約20〜30%であった。前記クロマトグラフィーのステップを実施した後、アセチル化IFNは検出されない。
Claims (24)
- アセチル化および非アセチル化タンパク質を含む未精製物をマルチモードクロマトグラフィー支持体に適用するステップ、および
pHを変化させて溶出を行うステップ
を含み、非アセチル化タンパク質からアセチル化タンパク質を分離する方法。 - 前記マルチモードクロマトグラフィー支持体が、疎水性基および陰イオン交換基を含む、請求項1に記載の方法。
- 前記マルチモードクロマトグラフィー支持体の疎水性基が、芳香族基、複素芳香族基または非芳香族疎水性基(アルキル基など)を含む、請求項2に記載の方法。
- 前記疎水性基が、ヘキシル基、ブチル基、フェニル基またはエーテル基である、請求項2に記載の方法。
- 前記マルチモードクロマトグラフィー支持体の陰イオン交換基が、強力な陰イオン交換体である、請求項2に記載の方法。
- 前記マルチモードクロマトグラフィー支持体が、Capto(商標)adhereである、請求項1に記載の方法。
- 前記未精製物が、pH6〜7の間で適用される、請求項1に記載の方法。
- 前記未精製物が、細胞由来である、請求項1に記載の方法。
- 前記未精製物が、原核細胞由来である、請求項1に記載の方法。
- 前記溶出のためのpH変化が、段階的であるまたは勾配を有する、請求項1に記載の方法。
- pH変化が、3〜7の間で実施される、請求項1に記載の方法。
- 前記溶出のpH変化が、3.0〜5.5の間で実施される、請求項1に記載の方法。
- 前記溶出が、酢酸およびアンモニウムを含む溶液で行われる、請求項1に記載の方法。
- インスリン、ソマトトロピン、インターロイキン、インターフェロンまたはソマトメジンの精製において使用される、請求項1に記載の方法。
- (a)発現系から生産され、可溶化されおよびリフォールディングされたインターフェロンを、疎水性相互作用クロマトグラフィーに供するステップであって、当該インターフェロンがアセチル化形態および非アセチル化形態を含むステップ、および
(b)ステップ(a)で得られたインターフェロンを、本明細書で言及した非アセチル化タンパク質からアセチル化タンパク質を分離する方法に供して、非アセチル化形態のインターフェロンを得ることができるステップ、
を含む、発現系で生産された組み換えインターフェロンを精製してその非アセチル化形態を得る方法。 - 前記インターフェロンがインターフェロンαである、請求項15に記載の方法。
- 前記インターフェロンが、IFN-α2aおよびIFN-α2bである、請求項15に記載の方法。
- ステップ(a)において可溶化されリフォールディングされた前記インターフェロンが、発現系における組み換えタンパク質生産によって得られた組み換えインターフェロンの不溶性体の可溶化と、その後得られたインターフェロンを酸化剤の存在下でリフォールディングすることによって得られる、請求項15に記載の方法。
- 前記可溶化が、カオトロピック剤または洗浄剤などの可溶化剤で行われる、請求項18に記載の方法。
- 前記カオトロピック剤が、尿素またはグアニジン塩酸塩である、請求項19に記載の方法。
- 前記洗浄剤が、SDS、N-アセチルトリメチルアンモニウムクロリドまたはN-ラウロイルサルコシンナトリウムである、請求項19に記載の方法。
- 前記可溶化剤が、グアニジン塩酸塩である、請求項19に記載の方法。
- 前記酸化剤が、ヨウ素またはヨードソベンゾエートである、請求項18に記載の方法。
- 酸化剤が、o-ヨードソベンゾエートである、請求項18に記載の方法。
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