JP6132551B2 - シャペロン活性を保持するプロテアーゼ欠損DegP並びにノックアウトTsp及びptr遺伝子を持つ、組換えタンパク質発現のための細菌株 - Google Patents
シャペロン活性を保持するプロテアーゼ欠損DegP並びにノックアウトTsp及びptr遺伝子を持つ、組換えタンパク質発現のための細菌株 Download PDFInfo
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Description
a.低減されたプロテアーゼ活性を持つTspタンパク質をコードする、又はノックアウト変異Tsp遺伝子である、変異Tsp遺伝子、
b.低減されたプロテアーゼ活性を持つプロテアーゼIIIタンパク質をコードする、又はノックアウト変異ptr遺伝子である、変異ptr遺伝子、及び
c.シャペロン活性及び低減されたプロテアーゼ活性を持つDegPタンパク質をコードする変異DegP遺伝子
の1つ又は複数を含む組換えグラム陰性細菌細胞であって、
変異Tsp遺伝子及び/又は変異ptr遺伝子及び/又は変異DegP遺伝子並びに任意選択で目的タンパク質をコードするポリヌクレオチド配列を除いて、野生型細菌細胞と遺伝的に同質である、上記組換えグラム陰性細菌細胞を提供する。
a.遺伝子開始コドンへの変異並びに/又は遺伝子開始コドンの下流及び遺伝子停止コドンの上流に位置する1つ若しくは複数の停止コドンを含むノックアウト変異Tsp遺伝子、並びに/又は
b.遺伝子開始コドンへの変異並びに/又は遺伝子開始コドンの下流及び遺伝子停止コドンの上流に位置する1つ若しくは複数の停止コドンを含むノックアウト変異ptr遺伝子、並びに
c.任意選択で、シャペロン活性及び低減されたプロテアーゼ活性を持つDegPタンパク質をコードする変異DegP遺伝子
を含む、組換えグラム陰性細菌細胞を提供する。
配列番号1は、開始コドンの上流に6ヌクレオチドATGAACを包含する、変異していないTsp遺伝子のDNA配列である。
配列番号2は、変異していないTspタンパク質のアミノ酸配列である。
配列番号3は、開始コドンの上流に6ヌクレオチドATGAATを包含する、変異ノックアウトTsp遺伝子のDNA配列である。
配列番号4は、変異していないプロテアーゼIII遺伝子のDNA配列である。
配列番号5は、変異していないプロテアーゼIIIタンパク質のアミノ酸配列である。
配列番号6は、変異ノックアウトプロテアーゼIII遺伝子のDNA配列である。
配列番号7は、変異していないDegP遺伝子のDNA配列である。
配列番号8は、変異していないDegPタンパク質のアミノ酸配列である。
配列番号9は、変異DegP遺伝子のDNA配列である。
配列番号10は、変異DegPタンパク質のアミノ酸配列である。
配列番号11は、抗TNF抗体の軽鎖可変領域のアミノ酸配列である。
配列番号12は、抗TNF抗体の重鎖可変領域のアミノ酸配列である。
配列番号13は、抗TNF抗体の軽鎖のアミノ酸配列である。
配列番号14は、抗TNF抗体の重鎖のアミノ酸配列である。
配列番号15は、変異Tsp遺伝子の領域のためのAse I制限部位を含む3’オリゴヌクレオチドプライマー配列である。
配列番号16は、変異Tsp遺伝子の領域のためのAse I制限部位を含む5’オリゴヌクレオチドプライマー配列である。
配列番号17は、変異プロテアーゼIII遺伝子の領域のためのAse I制限部位を含む3’オリゴヌクレオチドプライマー配列である。
配列番号18は、変異プロテアーゼIII遺伝子の領域のためのAse I制限部位を含む5’オリゴヌクレオチドプライマー配列である。
配列番号19は、変異DegP遺伝子の領域のためのAse I制限部位を含む5’オリゴヌクレオチドプライマー配列である。
配列番号20は、変異DegP遺伝子の領域のためのAse I制限部位を含む3’オリゴヌクレオチドプライマー配列である。
を包含するK−12株ファミリーの株が挙げられる。野生型の大腸菌株のさらなる例としては、W株(ATCC9637)及びB株(ATCC23226)が挙げられる。
を含むK−12株ファミリーが挙げられる。さらなる適した大腸菌株としては、W株(ATCC9637)及びB株(ATCC23226)が挙げられる。好ましくはK−12 W3110などの野生型W3110株が用いられる。
を包含するK−12株ファミリーの株が挙げられる。本発明による細胞が上述のプロテアーゼ変異及び任意選択で目的タンパク質をコードするポリヌクレオチドを除いて同質遺伝子的であり得る、さらなる適した野生型の大腸菌株の例としては、W株(ATCC9637)及びB株(ATCC23226)が挙げられる。
・ His105への変異、又は
・ Asp135への変異、又は
・ Ser210への変異、又は
・ His105及びAsp135への変異、又は
・ His105及びSer210への変異、又は
・ Asp135及びSer210への変異、又は
・ His105、Asp135及びSer210への変異
・ S430への変異、又は
・ D441への変異、又は
・ K455への変異、又は
・ S430及びD441への変異、又は
・ S430及びK455への変異、又は
・ D441及びK455への変異、又は
・ S430、D441及びK455への変異
・ S430A若しくはS430C、及び/又は
・ D441A及び/又は
・ K455A若しくはK455H若しくはK455R
・ pBR322若しくはPACYC184などのプラスミド、及び/又は
・ 細菌ファージなどのウイルスベクター
・ トランスポゾンなどの転位性の遺伝要素
変異体大腸菌細胞株の作製
用いられた宿主細胞株はW3110遺伝子型:F−LAM−IN(rrnD−rrnE)1 rph1(ATCC番号27325)であった。
MXE004株は、2009年5月21日にNational Collection of Type Cultures、HPA、英国にアクセッション番号NCTC13447で寄託された。
MXE005株は、2009年5月21日にNational Collection of Type Cultures、HPA、英国にアクセッション番号NCTC13448で寄託された。
配列番号3に示されるようにEcoR I及びAse I制限マーカーを含むノックアウト変異Tsp遺伝子を含むpMXE191
配列番号6に示されるようにEcoR I及びAse I制限マーカーを含むノックアウト変異プロテアーゼIII遺伝子を含むpMXE192
配列番号9に示されるようにAse Iを含む変異DegP遺伝子を含むpMXE192
40μlの大腸菌細胞は、冷却されたBioRad 0.2cmエレクトロポレーションキュベット内で(10pg)1μlのpKO3 DNAと混合された後、2500V、25μF及び200Ωでエレクトロポレーションされた。1000μlの2×PYが速やかに添加され、細胞はインキュベーター内で30℃、1時間、250rpmで振とうすることにより回復した。細胞は2×PY中で段階的に1/10希釈された後、100μlの一定分量がクロラムフェニコールを20μg/ml含有する30℃及び43℃に予め加温された2×PY寒天プレート上に蒔かれた。プレートは30℃及び43℃で終夜インキュベートされた。
30℃で増殖したコロニー数はエレクトロポレーション効率の推定を出すものであったが、43℃での増殖を生き延びたコロニーは潜在的な組み込みイベントを表す。43℃プレートから単一コロニーが採取され、10mlの2×PYに再懸濁された。このうちの100μlが5%(w/v)ショ糖を含有する30℃に予め加温された2×PY寒天プレート上に蒔かれ、単一コロニーを生成した。プレートは30℃で終夜インキュベートされた。
ここでのコロニーは潜在的な同時に起こる脱組み込み及びプラスミドキュアリングイベントを表す。脱組み込み及びキュアリングイベントが増殖において早期に発生する場合、コロニー塊の大部分はクローンであろう。単一コロニーが採取され、クロラムフェニコール20μg/ml又は5%(w/v)ショ糖のいずれかを含有する2×PY寒天上にレプリカプレートが作成された。プレートは30℃で終夜インキュベートされた。
ショ糖で増殖し、且つクロラムフェニコールで死滅するコロニーは、潜在的な染色体置換及びプラスミドキュアリングイベントを表す。これらのコロニーが採取され、変異特異的なオリゴヌクレオチドでのPCRによりスクリーニングされた。正しいサイズの陽性PCRバンドを生成したコロニーが5%(w/v)ショ糖を含有する2×PY寒天上に現れて単一コロニーを生成し、プレートは30℃で終夜インキュベートされた。
PCR陽性、クロラムフェニコール感受性及びショ糖耐性の大腸菌の単一コロニーがグリセロールストック、化学的コンピテントセルを作るのに用いられ、5’及び3’隣接オリゴでのPCR反応のためのPCR鋳型として働いて、Taqポリメラーゼを用いたダイレクトDNAシークエンシングのためのPCR産物を生成した。
5ul バッファー×10(Roche)
1ul dNTP混合液(Roche、10mM混合液)
1.5ul 5’オリゴ(5pmol)
1.5ul 3’オリゴ(5pmol)
2ul 細胞溶解液
0.5ul Taq DNAポリメラーゼ(Roche 5U/ul)
38.5ul H2O
94℃ 1分間
94℃ 1分間)
55℃ 1分間) 30サイクル繰り返される
72℃ 1分間)
72℃ 10分間
振とうフラスコ培養を用いた変異大腸菌株における抗TNFα Fab’の発現
株MXE001、MXE004及びMXE005は、増殖及び抗TNFα Fab’の発現をW3110に対して比較する振とうフラスコ実験において試験された。
単一コロニーは5mlの2×PY(1% phytone、Difco、0.5%酵母エキス、Difco、0.5% NaCl)ブロス+テトラサイクリン(Sigma)10ug/mlの中に採取され、250rpmで振とうしながら37℃で終夜増殖させた。100ulのこの終夜培養液は200mlの化学合成SM6E培地(Humphreysら、2002、Protein Expression and Purification、26、309〜320ページに記載)+テトラサイクリン10ug/mlに接種するのに用いられ、250rpmで振とうしながら30℃で終夜増殖させた。100ulのこの第二の終夜培養液は、第二の200mlのSM6E培地+テトラサイクリン10ug/mlの入ったフラスコに接種するのに用いられた。これは培養液がOD600およそ2に達するまで増殖させた。培養液は短時間遠心分離されて細胞が回収された後、100mlのSM6Eに再懸濁された。グリセロールが終濃度12.5%になるように添加された後、一定分量の「順応細胞」が−80℃で保存された。
振とうフラスコ培養は2mlの一定分量の融解された合成培地「順応細胞」を200mlのSM6E培地+テトラサイクリン10ug/mlに添加することにより開始された。これらは250rpmで撹拌しながら30℃で終夜増殖させた。試験される各々の株は3連で増殖させた。
96ウェルのELISAプレートは4℃で終夜、AB141(ウサギ抗ヒトCH1、UCB)2μgml−1でPBS中でコーティングされた。300ulのサンプル/コンジュゲートバッファー(PBS、BSA 0.2%(w/v)、Tween20 0.1%(v/v))で3回洗浄後、サンプル及び標準の1/2段階希釈がプレート上で100μlのサンプル/コンジュゲートバッファー中で行われ、プレートは室温で1時間、250r.p.mで撹拌された。300ulの洗浄バッファー(PBS、Tween20 0.1%(v/v))で3回洗浄後、100μlの露出抗体6062(ウサギ抗ヒトκ HRPコンジュゲート、The Binding Site、Birmingham、U.K.)がサンプル/コンジュゲートバッファーで1/1000に希釈した後に添加された。プレートは次いで室温で1時間、250r.p.mで撹拌された。300ulの洗浄バッファーで3回洗浄後、100μlのTMB基質が添加され(TMB溶液(Calbiochem):dH2Oの50:50混合液)、A630が自動プレートリーダーを用いて記録された。ペリプラズム抽出液中のFab’濃度は適切なアイソタイプの精製Fab’標準との比較により算出された。
振とうフラスコ培養を用いた変異大腸菌株における抗mIL13マウスFabの発現
株MXE001、MXE004、MXE005及び野生型W3110細胞はマウス化抗mIL13 Fab’を発現するプラスミドpMKC006で形質転換され、実験が24時間後の代わりに6時間後に停止されたこと以外は例2に記載されたものと同じ振とうフラスコ方法を用いて試験された。
変異大腸菌株からの軽鎖及び重鎖の発現分析
例2に記載された振とうフラスコ実験の、プラスミドpMXE117で形質転換された株MXE005及び野生型W3110細胞由来のペリプラズム抽出液は、BIAcore(商標)2000装置(Pharmacia Biosensor AB、Uppsala、Sweden)を用いて行われる表面プラスモン共鳴結合アッセイを用いて試験された。抗TNFα Fab’はCM5センサーチップ上に標準的なNHS/EDC化学作用を用いて固定された。残渣のNHSエステルはエタノールアミン塩酸塩(1M)で不活化された。
Fab’についての変異大腸菌株のタンパク質分解活性の分析
例2における振とうフラスコ実験の、プラスミドpMXE117で形質転換された株MXE001、MXE005及び野生型W3110細胞由来のペリプラズム抽出液は、ポリクローナルなウエスタンブロット分析において抗TNFα Fab’のタンパク質分解と比較して次のように試験された。
高密度発酵を用いた変異大腸菌株の増殖及び変異大腸菌株におけるFab’の発現
株MXE005及び野生型W3110細胞は、増殖及び抗TNFα Fab’の発現を比較する発酵実験において試験されたプラスミドpMXE117で形質転換された。
発酵増殖培地は3.86g/l NaH2PO4.H2O及び112g/lグリセロールを含むSM6E培地(Humphreysら、2002、Protein Expression and Purification、26、309〜320ページに記載される)に基づくものであった。
種菌培養液は10μg/mlテトラサイクリンを補充した同一培地中で増殖させた。培養液は30℃で撹拌しながらおよそ22時間インキュベートされた。
発酵槽(総容量2.5リットル)に、種菌培養液が0.3〜0.5のOD600になるように接種した。温度は増殖期の間は30℃に維持され、誘導の前に25℃へと下げられた。溶存酸素濃度は可変の撹拌及び気流により30%より高い空気飽和度で維持された。培養液のpHは15%(v/v)NH4OH及び10%(v/v)濃H2SO4での自動滴定により7.0で制御された。発泡は10%(v/v)Struktol J673溶液(Schill及びSeilacher)の添加により制御された。
バイオマス濃度は600nmでの培養液の光学密度を測定することにより決定された。
細胞は培養サンプルから遠心分離により回収された。上清画分はさらなる分析のために(−20℃で)保持された。細胞ペレット画分は抽出バッファー(100mM Tris−HCl、10mM EDTA、pH7.4)中で元の培養液の液量になるように再懸濁された。60℃でおよそ16時間のインキュベーションに続いて、抽出液は遠心分離により澄まされ、上清画分は分析のために(−20℃で)保持された。
ペリプラズム抽出液及び培養上清中のFab’濃度はHumphreysら、2002、Protein Expression and Purification、26、309〜320ページに記載されるFab’アセンブリーELISAにより決定された。
振とうフラスコ実験におけるW3110及び高度に変異した大腸菌株と比較した変異大腸菌株MXE001、MXE004及びMXE005の増殖
次の株が振とうフラスコ実験において分析され、増殖速度が評価された。
W3110由来の変異大腸菌株MXE001、MXE004及びMXE005(例1)
野生型大腸菌株W3110
以下の遺伝子型を持つSURE(Stratagene)
以下の遺伝子型を持つSTBL3(Invitrogen)
以下の遺伝子型を持つTOP10(Invitrogen)
及び以下の遺伝子型を持つXL1−Blue(Stratagene)
Claims (16)
- 配列番号3の配列を含むノックアウト変異Tsp遺伝子である、変異Tsp遺伝子と、
任意選択で目的とする外因性の治療的、予防的又は診断的タンパク質をコードするポリヌクレオチド配列を含む発現ベクターとを含む、組換えグラム陰性細菌細胞であって、
前記変異Tsp遺伝子を除いて、大腸菌(E.coli)細胞株K−12 W3110、MG1655、W1485、W3101又はBW30270と遺伝的に同質である、上記組換えグラム陰性細菌細胞。 - a.配列番号6の配列を含むノックアウト変異Ptr遺伝子である、変異Ptr遺伝子、あるいは
b.シャペロン活性及び50%以下のプロテアーゼ活性を持つDegPタンパク質をコードし、配列番号9の配列を含む、変異DegP遺伝子
を追加で含み、
前記変異Tsp遺伝子、及び前記変異Ptr遺伝子又は変異DegP遺伝子を除いて、大腸菌(E.coli)細胞株K−12 W3110、MG1655、W1485、W3101又はBW30270と遺伝的に同質である、請求項1に記載の組換えグラム陰性細菌細胞。 - 前記ノックアウト変異Ptr遺伝子及び/又は前記ノックアウト変異Tsp遺伝子が、遺伝子開始コドンへの変異、並びに/又は遺伝子開始コドンの下流及び遺伝子停止コドンの上流に位置する1つ若しくは複数の停止コドンを含む、請求項1又は2に記載の細胞。
- MXE001株(アクセッション番号NCTC13444)である、請求項1に記載の細胞。
- シャペロン活性を持つがプロテアーゼ活性を持たないDegPタンパク質をコードする変異DegP遺伝子及びノックアウト変異Tsp遺伝子を含む、請求項2に記載の細胞。
- MXE005株(アクセッション番号NCTC13448)である、請求項5に記載の細胞。
- ノックアウト変異Ptr遺伝子及びノックアウト変異Tsp遺伝子を含む、請求項2に記載の細胞。
- MXE004株(アクセッション番号NCTC13447)である、請求項7に記載の細胞。
- 前記変異DegP遺伝子、前記変異Ptr遺伝子及び/又は前記変異Tsp遺伝子が、1つ又は複数の制限マーカー部位を含む、請求項1又は2に記載の細胞。
- 前記ノックアウト変異Ptr遺伝子及び/又は前記ノックアウト変異Tsp遺伝子が、インフレームの停止コドンを含む制限マーカー部位を含む、請求項9に記載の細胞。
- 前記制限マーカー部位がAse I制限部位である、請求項9に記載の細胞。
- 前記ノックアウト変異Ptr遺伝子及び/又は前記ノックアウト変異Tsp遺伝子が、遺伝子開始コドンへのミスセンス変異及び任意選択で1つ又は複数のさらなる点変異により作出される制限マーカー部位を含む、請求項9に記載の細胞。
- 前記制限マーカー部位が、EcoR Iマーカー部位である、請求項12に記載の細胞。
- 前記目的タンパク質が、抗体又はその抗原結合断片である、請求項1に記載の細胞。
- 前記抗体又はその抗原結合断片が、TNFに特異的である、請求項14に記載の細胞。
- 請求項1〜15のいずれか一項に記載の組換えグラム陰性細菌細胞中で目的の組換えタンパク質を発現させるステップを含む、目的の組換えタンパク質を生産する方法。
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GB201001791D0 (en) | 2010-02-03 | 2010-03-24 | Ucb Pharma Sa | Process for obtaining antibodies |
GB201012599D0 (en) | 2010-07-27 | 2010-09-08 | Ucb Pharma Sa | Process for purifying proteins |
KR102023786B1 (ko) | 2011-07-13 | 2019-09-20 | 유씨비 파마, 에스.에이. | 재조합 dsbc를 발현하는 세균 숙주 균주 |
EP2546267A1 (en) | 2011-07-13 | 2013-01-16 | UCB Pharma S.A. | Bacterial host strain expressing recombinant DsbC |
GB201208367D0 (en) | 2012-05-14 | 2012-06-27 | Ucb Pharma Sa | Biological product |
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