JP2023504648A - Cho細胞由来のタンパク質分泌因子及びそれを含む発現ベクター - Google Patents
Cho細胞由来のタンパク質分泌因子及びそれを含む発現ベクター Download PDFInfo
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Abstract
Description
1-1. CHO HCP Mass分析
トリプシン(trypsin)処理したCHO細胞(DXB11)培養液に、次のように4種類(ADH、BSA、PHO、ENL)のMassPREPTM Protein Digest Standardを入れた。4種類のMassPREPTM Protein Digest Standardのうち、PHOを各HCP(Host Cell Protein)の濃度を計算するための内部標準物質(Internal Standard)として用いた。各試料は、2D LC(high pH RP/Low pH RP)-Q-TOF(UDMSe)方法により宿主細胞タンパク質(Host cell protein;HCP)を分析した。
HCP濃度が高い順に配列し、各タンパク質のアミノ酸配列をCHOゲノムデータベース(http://chogenome.org)で確認した。得られたアミノ酸配列をSignalP4.1サーバ(http://www.cbs.dtu.dk/services/SignalP/)に入力し、分泌タンパク質(Secretion Protein)の有無及びシグナルペプチド(Signal Peptide)配列を予測した(表1、図1及び表4)。
2-1. 仮発現用組換えタンパク質発現ベクターの製作
実施例1で選定された10種のシグナルペプチド(Signal Peptide)が汎用の分泌因子として利用できるかどうかを確認するために、目的タンパク質としてmCherry(pmCherry Vector, Clontech, 632522)タンパク質を選定した。
10種類のシグナルペプチド(Signal Peptide)から発現されるmCherry発現ベクターのそれぞれを、CHO-S細胞株Amaxa 4D-Nucleofector Protocolに従ってトランスフェクション(1mL)を進行した。その後、2日目と6日目に細胞内蛍光と培養液から分泌された蛍光タンパク質の蛍光値を測定した(図3)。
3-1. 位置特異的に組み込みのための発現ベクターの製作
前記実施例2で選定された5種類のシグナルペプチド(Clus、Pig、Nuc、CC、Proco)及び対照群であるSP7.2を含むmCherry配列をCHOゲノムの特定位置に同一に挿入して定量的に発現量を比較した(図4及び図5)。
前記で製作した6種類の位置特異的組み込み用ベクターをCHO-Sゲノム内のHprt Siteに挿入するために、CRISPR-Cas9を用いてノックイン(Knock In)した。sgRNA 240ng、cas9タンパク質 1250ng、ドナーベクター1μgをNucleofector溶液と混合して、50μlの混合物(Mixture)をそれぞれ製造した。
4-1. Anti PD1抗体生産のための発現ベクターの製作
位置特異的組み込み(Site Specific Integration)を介してシグナルペプチド(Signal Peptide)の発現能を比較した後、発現の高いCC、Clus、Pigを含む4種類のシグナルペプチド(Signal Peptide;(CC、Pig、Clus、SP7.2))が融合したAnti-PD-1抗体を発現させた。目的タンパク質としては、Pembrolisumab(Keytruda(登録商標))抗体配列を用いた。
’(N末端)-[BamHI制限部位-シグナルペプチド(配列番号33)-Pem軽鎖(配列番号58)-XhoI制限部位]-(C末端)’/’(N末端)-[AscI制限部位-シグナルペプチド(配列番号33) - Pem重鎖(配列番号59)-NotI制限部位]-(C末端)’
’(N末端)-[BamHI制限部位-シグナルペプチド(配列番号4)-Pem軽鎖(配列番号58)-XhoI制限部位]-(C末端)’/’(N末端)-[AscI制限部位-シグナルペプチド(配列番号4)-Pem重鎖(配列番号59)-NotI制限部位]-(C末端)’
’(N末端)-[BamHI制限部位-シグナルペプチド(配列番号2)-Pem軽鎖(配列番号58)-XhoI制限部位]-(C末端)’/’(N末端)-[AscI制限部位-シグナルペプチド(配列番号2)-Pem重鎖(配列番号59)-NotI制限部位]-(C末端)’
’(N末端)-[BamHI制限部位-シグナルペプチド(配列番号5)-Pem軽鎖(配列番号58)-XhoI制限部位]-(C末端)’/’(N末端)-[AscI制限部位-シグナルペプチド(配列番号5)-Pem重鎖(配列番号59)-NotI制限部位]-(C末端)’
前記準備した組換え発現ベクターpCB-SP7.2-Pem、pCB-Clus-Pem、pCB-Pig-Pem及びpCB-CC-PemをExpiCHO-S(登録商標)細胞(Thermo Fisher Scientific)に導入し、ExpiCHO発現培地(Thermo Fisher Scientific;30mL)で12日間培養(Fed-Batch Culture;Day 1&Day 5添加)して、前記融合ポリペプチドPembrolisumabを発現させた。
前記組換えベクター発現によって生産された融合ポリペプチドをProteinA精製した。具体的には、回収した培養液は0.22μmフィルターでろ過した後、ProteinAレジンがパッキングされているカラム(Hitrap MSS, GE Healthcare, 11-0034-93)をAKTA(登録商標) Avant25(GE Healthcare Life Sciences)に装着し、PBSバッファーを流して、カラム(colum)を平衡化した。
Claims (19)
- 配列番号1、配列番号2または配列番号3のアミノ酸配列からなるタンパク質分泌因子。
- 前記タンパク質が、内在タンパク質または外来タンパク質である、請求項1に記載のタンパク質分泌因子。
- 配列番号1、配列番号2、配列番号3、配列番号4または配列番号5のアミノ酸配列からなるタンパク質分泌因子をコード化する核酸配列;及び目的タンパク質をコード化する遺伝子;が作動可能に連結された発現カセット。
- 前記目的タンパク質が、抗体、抗体断片(FabまたはScFv)、融合タンパク質(Fusion Protein)、足場タンパク質(Protein Scaffold)、ヒト成長ホルモン、血清タンパク質、免疫グロブリン、サイトカイン、α- 、β-またはγ-インターフェロン、コロニー刺激因子(GM-CSF)、血小板誘導成長因子(PDGF)、ホスホリパーゼ活性化タンパク質(PLAP)、インスリン、腫瘍壊死因子(TNF)、成長因子、ホルモン、カルシトニン(calcitonin)、カルシトニン遺伝子関連ペプチド(Calcitonin Gene Related Peptide、CGRP)、エンケファリン(enkephalin)、ソマトメジン、エリスロポエチン、視床下部分泌因子、成長分化因子(Growth differentiation factor)、細胞接着タンパク質(Cell adhesion protein)、プロラクチン、慢性ゴナドトロピン、組織プラスミノーゲン活性化剤、成長ホルモン分泌ペプチド(growth hormone releasing peptide;GHPR)、胸腺体液性因子(thymic humoral factor;THF)、アスパラギナーゼ、アルギナーゼ、アルギニンデアミナーゼ、アデノシンデアミナーゼ、スーパーオキシドジスムターゼ、エンドトキシナーゼ、カタラーゼ、キモトリプシン、リパーゼ、ウリカーゼ、アデノシンジホスファターゼ、チロシナーゼ、ビリルビンオキシダーゼ、グルコースオキシダーゼ、グルコダーゼ、ガラクトシダーゼ、グルコセレブロシダーゼ及びグルコロニダーゼからなる群から選択される、請求項3に記載の発現カセット。
- 前記配列番号1、配列番号2、配列番号3、配列番号4または配列番号5のアミノ酸配列からなるタンパク質分泌因子をコード化する核酸配列が、配列番号11、配列番号12、配列番号13、配列番号14または配列番号15である、請求項3に記載の発現カセット。
- 前記発現カセットが、配列番号6、配列番号7、配列番号8、配列番号9及び配列番号10のアミノ酸配列からなるタンパク質分泌因子のいずれか1つをコード化する核酸配列をさらに含むものである、請求項3に記載の発現カセット。
- 前記発現カセットが、細胞内で発現される時、分泌因子をコード化する核酸配列が除去された付加的アミノ酸が追加されていない目的タンパク質のまま発現するものである、請求項3に記載の発現カセット。
- 配列番号1、配列番号2、配列番号3、配列番号4または配列番号5のアミノ酸配列からなるタンパク質分泌因子をコード化する核酸配列;目的タンパク質をコード化する遺伝子;が作動可能に連結された発現カセットを含む、目的タンパク質分泌用発現ベクター。
- 前記目的タンパク質が、抗体、抗体断片(FabまたはScFv)、融合タンパク質(Fusion Protein)、足場タンパク質(Protein Scaffold)、ヒト成長ホルモン、血清タンパク質、免疫グロブリン、サイトカイン、α- 、β-またはγ-インターフェロン、コロニー刺激因子(GM-CSF)、血小板誘導成長因子(PDGF)、ホスホリパーゼ活性化タンパク質(PLAP)、インスリン、腫瘍壊死因子(TNF)、成長因子、ホルモン、カルシトニン(calcitonin)、カルシトニン遺伝子関連ペプチド(Calcitonin Gene Related Peptide、CGRP)、エンケファリン(enkephalin)、ソマトメジン、エリスロポエチン、視床下部分泌因子、成長分化因子(Growth differentiation factor)、細胞接着タンパク質(Cell adhesion protein)、プロラクチン、慢性ゴナドトロピン、組織プラスミノーゲン活性化剤、成長ホルモン分泌ペプチド(growth hormone releasing peptide;GHPR)、胸腺体液性因子(thymic humoral factor;THF)、アスパラギナーゼ、アルギナーゼ、アルギニンデアミナーゼ、アデノシンデアミナーゼ、スーパーオキシドジスムターゼ、エンドトキシナーゼ、カタラーゼ、キモトリプシン、リパーゼ、ウリカーゼ、アデノシンジホスファターゼ、チロシナーゼ、ビリルビンオキシダーゼ、グルコースオキシダーゼ、グルコダーゼ、ガラクトシダーゼ、グルコセレブロシダーゼ及びグルコロニダーゼからなる群から選択されるものである、請求項8に記載の発現ベクター。
- 前記配列番号1、配列番号2、配列番号3、配列番号4または配列番号5のアミノ酸配列からなるタンパク質分泌因子をコード化する核酸配列が、配列番号11、配列番号12、配列番号13、配列番号14または配列番号15である、請求項8に記載の発現ベクター。
- 前記発現ベクターが、配列番号6、配列番号7、配列番号8、配列番号9及び配列番号10のアミノ酸配列からなるタンパク質分泌因子のいずれか1つをコード化する核酸配列をさらに含むものである、請求項8に記載の発現ベクター。
- 前記発現ベクターが、細胞内で発現される時、分泌因子をコード化する核酸配列が除去された付加的アミノ酸が追加されていない目的タンパク質のまま発現するものである、請求項8に記載の発現ベクター。
- 請求項8~12のいずれか一項に記載の発現ベクターが宿主細胞に導入された形質転換体細胞。
- 前記宿主細胞が、チャイニーズハムスター卵巣細胞(CHO細胞)である、請求項13に記載の形質転換体細胞。
- i)配列番号1、配列番号2、配列番号3、配列番号4または配列番号5のアミノ酸配列からなるタンパク質分泌因子をコード化する核酸配列;及び目的タンパク質をコード化する遺伝子;が作動可能に連結された発現カセットを含む、目的タンパク質分泌用発現ベクターを含む形質転換体細胞を培養する段階;及び
ii)前記培養された細胞の培養物または培養上清液から目的タンパク質を回収する段階を含む、目的タンパク質を生産する方法。 - 前記回収した目的タンパク質を精製する段階をさらに含むものである、請求項15に記載の目的タンパク質を生産する方法。
- 前記宿主細胞が、チャイニーズハムスター卵巣細胞(CHO細胞)である、請求項15に記載の目的タンパク質を生産する方法。
- 前記配列番号1、配列番号2、配列番号3、配列番号4または配列番号5のアミノ酸配列からなるタンパク質分泌因子が、前記目的タンパク質のN末端の切断部位で切断されるものである、請求項15に記載の目的タンパク質を生産する方法。
- 前記目的タンパク質が、タンパク質分泌因子をコード化する核酸配列が除去された付加的アミノ酸が付加されていない目的タンパク質自体である、請求項15に記載の目的タンパク質を生産する方法。
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