JP5980342B2 - 遺伝子組換え菌の組換えタンパク質を高効率で発現する方法およびそれを用いた組換えポリペプチドの調整方法 - Google Patents
遺伝子組換え菌の組換えタンパク質を高効率で発現する方法およびそれを用いた組換えポリペプチドの調整方法 Download PDFInfo
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Classifications
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/001—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof by chemical synthesis
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/195—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from bacteria
- C07K14/24—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from bacteria from Enterobacteriaceae (F), e.g. Citrobacter, Serratia, Proteus, Providencia, Morganella, Yersinia
- C07K14/245—Escherichia (G)
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- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/195—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from bacteria
- C07K14/305—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from bacteria from Micrococcaceae (F)
- C07K14/31—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from bacteria from Micrococcaceae (F) from Staphylococcus (G)
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
- C12N1/20—Bacteria; Culture media therefor
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
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- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/11—DNA or RNA fragments; Modified forms thereof; Non-coding nucleic acids having a biological activity
- C12N15/62—DNA sequences coding for fusion proteins
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- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
- C12N15/70—Vectors or expression systems specially adapted for E. coli
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- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P21/00—Preparation of peptides or proteins
- C12P21/02—Preparation of peptides or proteins having a known sequence of two or more amino acids, e.g. glutathione
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2319/00—Fusion polypeptide
- C07K2319/01—Fusion polypeptide containing a localisation/targetting motif
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2319/00—Fusion polypeptide
- C07K2319/01—Fusion polypeptide containing a localisation/targetting motif
- C07K2319/035—Fusion polypeptide containing a localisation/targetting motif containing a signal for targeting to the external surface of a cell, e.g. to the outer membrane of Gram negative bacteria, GPI- anchored eukaryote proteins
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- Zoology (AREA)
- Wood Science & Technology (AREA)
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- Biotechnology (AREA)
- Biochemistry (AREA)
- Molecular Biology (AREA)
- General Health & Medical Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Biophysics (AREA)
- Microbiology (AREA)
- Proteomics, Peptides & Aminoacids (AREA)
- Medicinal Chemistry (AREA)
- Gastroenterology & Hepatology (AREA)
- Plant Pathology (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Tropical Medicine & Parasitology (AREA)
- Virology (AREA)
- Preparation Of Compounds By Using Micro-Organisms (AREA)
- Peptides Or Proteins (AREA)
- Micro-Organisms Or Cultivation Processes Thereof (AREA)
Description
上述の熱衝撃誘導ステップにおいて、培地に最終濃度が0.5mMのPTGを添加する。
菌体の上清液における組換えタンパクを精製するとき、CMイオン交換カラムを使用し、溶出用の硼酸緩衝液のNaCl濃度は0.2Mである。
(菌株)
E.coliTG1遺伝子組換え菌(AECOM,K.JaKesによる寄付);
Novagen社から購入した、E.coliBL−21(DE3)、B834(DE3)、NovaBlue(DE3)および618遺伝子組換え菌;
ATCC(American Type Culture Collection)から購入した黄色ブドウ球菌ATCCBAA−42。
(主な試薬および薬品)
酵母粉末(OXIOD LP0021)、ペプトン(OXIOD LP0042)およびその他の化学試薬は、すべて国産である;
透析袋Snake Skin Dialysis Tubing(Pierce,リテンション相対分子量1×104,Lot#KD32324);
注射用硫酸ストレプトマイシン(華北製薬);
注射用アンピシリンナトリウムAMP(ハルビン製薬);
陰イオン交換カラムゲル(Pharmacia Biotech CM Sepharose Fast Flow LotNo.225016)。
Bio−Radタンパク質クロマトグラフィー精製システム(BioLogic Duo Flow,BioLogic Maximizer,BioLogic QuadTec UV−Vis Detector,BioLogic Econo Pump);
遠心分離機(Beckman Coulter Avanti J−20XP,Beckman Coulter Avanti J−25);
スペクトル計(Bio−Rad Smart Spect Plus spectrophotometer);
全自動発酵槽(スイスBioengneering.AG LP351−42L);
細菌高圧ホモジナイザー(イタリアNiro Soavi NS1001L2KSN 6564)。
シリコンが載ってあるIaおよびその免疫タンパク質遺伝子(GenBank M13819)の古典的プラスミドは、Dr.Finkelstein実験室からきている。(Qiu XQ et al.An engineered multidomain bactericidal peptide as a model for targeted antibiotics against specific bacteria.Nat Biotechnol,2003;21(12):1480−1485)。本実験室による改造を通して、pBHC−SA1、pBHC−SA2、pBHC−SA3、pBHC−SA4、pBHC−SE、pBHC−PA、pBHC−PorA1と7種類の組換え突然変異プラスミドを得た。
組換え突然変異プラスミドpBHC−SA1 100ngをそれぞれ4040 ul Novagenの数種類のpETシステム遺伝子組換え菌BL−21(DE3)、B834(DE3)、NovaBlue(DE3)、618に、5分間インキュベートし、42℃で熱衝撃を30秒行った後、氷に2分間置く。SOC培地160ulを添加し、220rpm、37℃で細菌を1時間振盪した後、プレートに蒔く(LB培地に1%の寒天を添加し、50ug/mlアンピシリンを添加し、37℃で一晩置く)。 コロニーを選択して増殖し、菌種を獲得し、低温で菌種を保存する。
1.菌種の回復
保存された菌種を取り出し、4℃で解凍する。1.5mlを取り、10mlLB培地(AMP50μg/ml含有)に入れ、220rpm、37℃の条件下において5〜8時間培養する。
回復された菌液を104または105倍に希釈し、10ul希釈後の菌液を取り、調製しておいたLB個体培地(AMP50μg/ml)プレートに添加し、プレートを塗布する。湿った箱に入れ、37℃のインキュベーターで10〜12時間培養する。培地表面に円形の単一コロニーが形成される。
(1)滅菌済み爪楊枝または接種ループを用い、生育を終えたプレートで規則正しい円形で、周縁が滑らかな単一コロニーを採択して、1.5mlLB培地に入れ、振盪培養する。220rpm、37℃で5〜8時間培養する。
(2)1.5mlLB菌液を100mlLB培地に入れ、振盪培養する。220rpm、37℃で5〜8時間培養する。
培養液6000gを4℃下で20min遠心分離を行う。遠心分離後の沈殿物を回収し、50mMの硼酸緩衝液(pH9.0)に入れ、菌体を硼酸緩衝液に懸濁させる。注:硼酸緩衝液に2mMのPMSF(中国語の名称の日本語訳は、「フッ化フェニルメタンスルホニルのセリンプロテアーゼ阻害剤」である)を添加する。菌体が懸濁された後に4℃下で操作する。
菌体が完全にpH9.0硼酸緩衝液に懸濁した後に、高圧ホモジナイザーを用いて500〜600barの高圧にして菌体を破砕する。7回繰り返して破砕し、毎回3〜5分間おきで菌体の破砕を行う。
破砕後の菌液55000gを4℃で40min遠心分離を行い、上清液を採取する。硫酸ストレプトマイシン(液体200mlあたりに16瓶100万単位の硫酸ストレプトマイシンを添加する)を加え、磁力攪拌機により1h撹拌する。
上記の菌液55000gを4℃で20min遠心分離し、上清液を取り、透析袋に入れ、硼酸緩衝液において8〜12時間透析する。透析液は、4時間ごとに一度換える。
透析した後の菌液55000gを4℃で20分間遠心分離し、上清液を取りビーカーに入れ、イオン交換法を用いてタンパク質を精製する。上清を取りCMイオン交換カラムにサンプリングし、タンパク質濃度を測定し、単位体積あたりのタンパク質含有量を計算する。サンプル量とCMイオンゲル粒子の割合は、操作マニュアルに従い、十分に洗浄した後、0.2MのNaClを含む50mM硼酸緩衝液で溶出して新型の抗菌性遺伝子組み換えポリペプチドを得る。
結果は、図1に示す。E.coliB834(DE3)が、PMC−SAに対する発現効率は、最も高い。
突然変異プラスミド100ngと調製したBL−21遺伝子組換え菌コンピテント細胞とを40ulを氷中で5分間インキュベートした後、42℃で30秒の熱衝撃を行う。次いで、氷中に2分間置く。SOC培基160ulを加え、220rpm、37℃で一時間細菌を振った後にプレートに菌を蒔く(LB培地に1%の寒天、アンピシリン50ug/mlを加え、37℃で一晩置く)。コロニーを採択し、大量増殖させる。
従来のコリシンIa成長培地は、FB培地である。(Qiu XQ et al.An engineered multidomain bactericidal peptide as a model for targeted antibiotics against specific bacteria.Nat Biotechnol,2003;21(12):1480−1485/Karen Jakes,Charles Abrams,Alan Finkelstein,et al.Alteration of the pH−dependent Ion Selectivity of the Colicin E1 Channel by site−directed Mutagenesis.JBC,1990;265(12):6984−6991)。FB培地は、25g/Lのペプトン、7.5g/Lの酵母粉末、6g/LのNaCl、1g/Lのグルコースを含む。
最初に二種類の培地の複合を試みる。
本発明において調製した組換えポリペプチド(PMC−SA1、PMC−SA2、PMC−SA3、PMC−SA4、PMC−SE、PMC−PA、PMC−AM)の基本構造は、コリシンIaである。また、コリシンIaの等電点は、約9.15であるため、その典型的な精製方法は、イオン親和クロマトグラフィー交換法を使用した。(Qiu XQ et al.An engineered multidomain bactericidal peptide as a model for targeted antibiotics against specific bacteria.Nat Biotechnol,2003;21(12):1480−1485)。
ステップ1.SDS−PAGE電気泳動
実施例4の最適化方法により抽出した融合タンパク質サンプルに対して、SDS−PAGE電気泳動および硝酸銀染色を行う。図2に示すように、電気泳動図aにおいて、相対分子質量が約70kDのところに、明確なウェスタンブロッティングのバンドがある。即ち本発明の調製したPMC−SA1である。図bは、実施例4において、改善された勾配溶出法により得たタンパク質は、異質バンドが取り除かれ、純度が高くなる。本発明の最適化方法により調製して得たその他の六種類の組換えタンパク質の純度も、同様に増加された。
実施例1、実施例2、および実施例3によって調製方法を改善した後に得た組換えタンパク質PMC−SA1とPMC−AMに対して、以下のように抗菌活性試験を実施した。
抑菌実験曲線から、本発明における改良方法により調製した組換えポリペプチドは、良好な抗菌活性を有することがわかる。
Claims (8)
- 一端が親水性を有するコリシンポリペプチド端末であり、他端が疎水性を有する標的物質識別ポリペプチド端末であるポリペプチドを有する遺伝子組換え菌の組換えタンパク質を発現する方法であり、
前記遺伝子組換え菌の組換えタンパク質をコードする遺伝子組換えプラスミドを大腸菌pETシステムの遺伝子組換え菌であるE.coliB834(DE3)に形質転換することによって、陽性モノクローンを得るステップ(1)と、
前記陽性モノクローンを増殖させることで得られた液体種菌を誘導し、大量増殖を行い、発現された前記遺伝子組換え菌の組換えタンパク質を含む上清液を得るステップ(2)と、
前記上清液に含まれている発現された前記遺伝子組換え菌の組換えタンパク質を分離して精製するステップ(3)と、を含み、
大量増殖で使用する培地は、NaCl6.0〜6.7g/L、ペプトン25.0g/L、酵母粉末7.5g/L、グルコース0.6〜2.0g/L、Na 2 HPO 4 ・7H 2 O6.8〜18.3g/L、KH 2 PO 4 3.0〜4.3g/L、NH 4 Cl1.0〜1.4g/L、MgSO 4 0.2〜0.4g/L、CaCl 2 0.01g/L、およびメチオニン0〜40mg/Lを含有し、水を溶媒とすることを特徴とする遺伝子組換え菌の組換えタンパク質を高効率で発現する方法。 - 大量増殖で使用する培地は、NaCl6.0g/L、ペプトン25.0g/L、酵母粉末7.5g/L、グルコース2.0g/L、Na2HPO4・7H2O6.8g/L、KH2PO43.0g/L、NH4Cl1.0g/L、MgSO40.2g/L、CaCl20.01g/L、およびメチオニン0〜40mg/Lを含有し、水を溶媒とすることを特徴とする請求項1に記載の方法。
- 前記誘導を行う方法は、熱衝撃による誘導方法であり、
その操作方法は、液体種菌をタンクに入れた後、30℃で2〜3時間初期成長させ、OD値が0.4〜0.6に達したとき、42℃で熱衝撃を30分行い、次いで、温度を37℃まで下げ、再び1.5〜2時間成長させてから、細菌を回収することを特徴とする請求項1または2に記載の方法。 - 前記熱衝撃による誘導方法において、大量増殖で使用する培地に最終濃度が0.5mMのIPTGを添加することを特徴とする請求項3に記載の方法。
- 前記上清液に含有する発現された前記遺伝子組換え菌の組換えタンパク質は、CMイオン交換カラムを用いて分離精製され、
その中のサンプル量は、上清液のタンパク質量とゲル粒子体積との比例である2.5mg/mlに基づいて決められることを特徴とする請求項1に記載の方法。 - 前記上清液に含有する発現された前記遺伝子組換え菌の組換えタンパク質は、CMイオン交換カラムを使用して分離精製され、
溶出用の硼酸緩衝液におけるNaClの濃度は、0.2Mであることを特徴とする請求項5に記載の方法。 - 請求項1〜6のいずれか一項に記載の組換えポリペプチドの調整方法に用いられる培地であって、
NaCl6.0〜6.7g/L、ペプトン25.0g/L、酵母粉末7.5g/L、グルコース0.6〜2.0g/L、Na2HPO4・7H2O6.8〜18.3g/L、KH2PO43.0〜4.3g/L、NH4Cl1.0〜1.4g/L、MgSO40.2〜0.4g/L、CaCl20.01g/L、およびメチオニン0〜40mg/Lを含有し、水を溶媒とすることを特徴とする大腸菌pETシステム遺伝子組換え菌に用いられる培地。 - 前記大腸菌pETシステム遺伝子組換え菌はE.coli B834(DE3)であり、
前記培地は、NaCl6.0g/L、ペプトン25.0g/L、酵母粉末7.5g/L、グルコース2.0g/L、Na2HPO4・7H2O6.8g/L、KH2PO43.0g/L、NH4Cl1.0g/L、MgSO40.2g/L、CaCl20.01g/L、およびメチオニン40mg/Lを含有し、水を溶媒とすることを特徴とする請求項7に記載の培地。
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