JPWO2018025886A1 - 組換えタンパク質の生産方法 - Google Patents
組換えタンパク質の生産方法 Download PDFInfo
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- JPWO2018025886A1 JPWO2018025886A1 JP2018531939A JP2018531939A JPWO2018025886A1 JP WO2018025886 A1 JPWO2018025886 A1 JP WO2018025886A1 JP 2018531939 A JP2018531939 A JP 2018531939A JP 2018531939 A JP2018531939 A JP 2018531939A JP WO2018025886 A1 JPWO2018025886 A1 JP WO2018025886A1
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Abstract
Description
[1]
誘導性プロモーターの制御下で組換えタンパク質を発現する組換え細胞を用いた当該組換えタンパク質の生産方法であって、
上記組換え細胞を増殖させた培養液の一部に新鮮な培地を添加して連続的に培養することを含み、
上記組換えタンパク質の発現を誘導した組換え細胞を繰り返し使用しない、組換えタンパク質の生産方法。
[2]
上記組換え細胞の増殖と、上記組換えタンパク質の発現の誘導とが、異なる培養槽で行われる、[1]に記載の組換えタンパク質の生産方法。
[3]
上記組換え細胞の増殖が、流加培養により行われる、[1]又は[2]に記載の組換えタンパク質の生産方法。
[4]
誘導性プロモーターの制御下で組換えタンパク質を発現する組換え細胞を用いた当該組換えタンパク質の生産方法であって、
下記(A)〜(E)工程を繰り返すことを含む、組換えタンパク質の生産方法。
(A)上記組換え細胞を、培養槽で回分培養又は流加培養により増殖させる工程
(B)(A)工程での増殖後、上記培養槽の培養液の一部を受け入れ用の培養槽に移送する工程
(C)(B)工程での移送後、両培養槽のいずれか一方に新鮮な培地を添加して、(A)工程に進む工程
(D)(C)工程で(A)工程に進まなかったもう一方の培養槽で上記組換えタンパク質の発現を誘導し、上記組換えタンパク質を蓄積させる工程
(E)(D)工程で蓄積させた上記組換えタンパク質を、培養液から分離及び精製する工程
[5]
上記組換え細胞の増殖が対数増殖期の中期に達した時に、上記組換えタンパク質の発現の誘導を開始する、[1]〜[4]のいずれかに記載の組換えタンパク質の生産方法。
[6]
上記組換えタンパク質の発現の誘導が、発現誘導剤を培養液に添加すること、又は培養液の温度を変えることによって行われる、[1]〜[5]のいずれかに記載の組換えタンパク質の生産方法。
[7]
(B)工程で受け入れ用の培養槽に移送する培養液の量が、培養液全量を基準として、80〜99体積%である、[4]に記載の組換えタンパク質の生産方法。
[8]
上記組換え細胞が、上記組換えタンパク質をコードする遺伝子が染色体に組み込まれた細胞である、[1]〜[7]のいずれかに記載の組換えタンパク質の生産方法。
[9]
上記組換えタンパク質が、構造タンパク質である、[1]〜[8]のいずれかに記載の組換えタンパク質の生産方法。
[10]
上記構造タンパク質が、ケラチン、コラ−ゲン、エラスチン、レシリン、カイコシルク及びスパイダーシルクからなる群から選ばれるタンパク質由来のタンパク質である、[9]に記載の組換えタンパク質の生産方法。
[11]
上記誘導性プロモーターが、T7プロモーター、tacプロモーター、trcプロモーター、lacプロモーター及びlacUV5プロモーターから選ばれるIPTG誘導性プロモーター、又はPRプロモーター及びPLプロモーターから選ばれる温度誘導性プロモーターである、[1]〜[10]のいずれかに記載の組換えタンパク質の生産方法。
本実施形態に係る組換えタンパク質の生産方法は、組換えタンパク質を発現する組換え細胞を用いるものであり、組換え細胞を増殖させた培養液の一部に新鮮な培地を添加して連続的に培養することを含み、組換えタンパク質の発現を誘導した組換え細胞を繰り返し使用しないことを特徴とする。本実施形態に係る生産方法に用いる組換え細胞は、誘導性プロモーターの制御下で組換えタンパク質を発現する組換え細胞であることが好ましい。
本実施形態に係る生産方法で生産する組換えタンパク質(以下、「目的とするタンパク質」ということもある。)としては、工業規模での製造が好ましい任意のタンパク質を挙げることができ、例えば、工業用に利用できるタンパク質、医療用に利用できるタンパク質、構造タンパク質等を挙げることができる。工業用又は医療用に利用できるタンパク質の具体例としては、酵素、制御タンパク質、受容体、ペプチドホルモン、サイトカイン、膜又は輸送タンパク質、予防接種に使用する抗原、ワクチン、抗原結合タンパク質、免疫刺激タンパク質、アレルゲン、完全長抗体又は抗体フラグメント若しくは誘導体を挙げることができる。構造タンパク質の具体例としては、スパイダーシルク、カイコシルク、ケラチン、コラ−ゲン、エラスチン及びレシリン、並びにこれら由来のタンパク質等を挙げることができる。
本実施形態に係る組換え細胞は、例えば、目的とするタンパク質をコードする核酸配列と、当該核酸配列に作動可能に連結された1又は複数の調節配列とを有する発現ベクターで宿主を形質転換することにより得ることができる。
本実施形態に係る生産方法は、組換え細胞を増殖させた培養液の一部に新鮮な培地を添加して連続的に培養することを含み、組換えタンパク質の発現を誘導した組換え細胞を繰り返し使用しないことを特徴とする。ここで、「繰り返し使用しない」とは、当該組換えタンパク質の発現を誘導した組換え細胞を再度の増殖のための培養に使用しないことを意味する。培養は、例えば、深部通気攪拌培養等の好気的条件下で行うことができる。
(A)組換え細胞を、培養槽で回分培養又は流加培養により増殖させる工程
(B)(A)工程での増殖後、培養槽の培養液の一部を受け入れ用の培養槽に移送する工程
(C)(B)工程での移送後、両培養槽のいずれか一方に新鮮な培地を添加して、(A)工程に進む工程
(D)(C)工程で(A)工程に進まなかったもう一方の培養槽で上記組換えタンパク質の発現を誘導し、上記組換えタンパク質を蓄積させる工程
(E)(D)工程で蓄積させた上記組換えタンパク質を、培養液から分離及び精製する工程
組換えタンパク質の発現の誘導は、誘導性プロモーターによる転写(目的とするタンパク質をコードする核酸の転写)を活性化することにより行われる。誘導性プロモーターの活性化は、誘導性プロモーターの種類に応じて、当該技術分野で公知の方法に従って行うことができる。
組換えタンパク質の分離及び精製は、通常用いられている方法で行うことができる。例えば、組換えタンパク質が、細胞内に溶解状態で発現した場合には、組換えタンパク質の発現誘導のための培養終了後、宿主細胞(組換え細胞)を遠心分離により回収し、水系緩衝液に懸濁した後、超音波破砕機、フレンチプレス、マントンガウリンホモゲナイザー及びダイノミル等により宿主細胞を破砕し、無細胞抽出液を得る。該無細胞抽出液を遠心分離することにより得られる上清から、タンパク質の単離精製に通常用いられている方法、すなわち、溶媒抽出法、硫安等による塩析法、脱塩法、有機溶媒による沈殿法、ジエチルアミノエチル(DEAE)−セファロース、DIAION HPA−75(三菱化成社製)等のレジンを用いた陰イオン交換クロマトグラフィー法、S−Sepharose FF(Pharmacia社製)等のレジンを用いた陽イオン交換クロマトグラフィー法、ブチルセファロース、フェニルセファロース等のレジンを用いた疎水性クロマトグラフィー法、分子篩を用いたゲルろ過法、アフィニティークロマトグラフィー法、クロマトフォーカシング法、等電点電気泳動等の電気泳動法等の方法を単独又は組み合わせて使用し、組換えタンパク質の精製標品を得ることができる。
〔(1)改変フィブロイン発現株の作製〕
(プラスミド型発現株の作製)
ネフィラ・クラビペス(Nephila clavipes)由来のフィブロイン(GenBankアクセッション番号:P46804.1、GI:1174415)の塩基配列及びアミノ酸配列に基づき、配列番号1で示されるアミノ酸配列を有する改変フィブロイン(以下、「SEC472」ともいう。)を設計した。
バイオメダル社のpUTmini−Tn5 Kitを用いて、染色体組込み型発現株を作製した。
上記(1)で作製したプラスミド型発現株SEC659及び染色体組込み型発現株SEC714を、それぞれアンピシリンを含む2mLのLB培地で15時間培養した。同培養液をアンピシリンを含む100mLのシード培養用培地(表1)にOD600が0.005となるように添加し、培養液温度を30℃に保ち、OD600が5になるまでフラスコ培養を行い(約15時間)、それぞれのシード培養液を得た。
本培養用培地の組成を表2に示す。
培養槽に500mLの本培養用培地(表2)を加え、オートクレーブ(TOMY LSX−500)で121℃、20分間滅菌処理した。37℃まで冷却後、28−30%アンモニア水(関東化学、01266−88)を用いてpHを6.1〜6.3に調整した。
図1に示す培養システム100を使用し、プラスミド型発現株SEC659及び染色体組込み型発現株SEC714により組換え改変フィブロインの生産を行った。培養槽10及び培養槽20として、TSC−A1L−5型培養槽(高杉製作所,容量1L)を使用した。組換え改変フィブロインは、所定の細胞密度になるまで流加培養した培養液(約95%)を発現誘導に使用し、培養液の残部(約5%)に新鮮な培地を添加して流加培養を繰り返す、反復流加培養により生産した。
プラスミド保持率=(培地B上で形成されたコロニー数)/(培地Aから培地Bに移したコロニー数)
その結果、プラスミド型発現株SEC659は、8回目の反復流加培養のIPTG添加時までプラスミド保持率100%を維持していた。
〔反復流加培養及び発現誘導〕
図4に示す従来の培養システム200を使用し、プラスミド型発現株SEC659及び染色体組込み型発現株SEC714により組換え改変フィブロインの生産を行った。培養槽10及び培養槽20として、TSC−A1L−5型培養槽(高杉製作所,容量1L)を使用した。組換え改変フィブロインは、発現誘導を行った培養液の一部(約5%)に新鮮な培地を添加して流加培養を繰り返す、反復流加培養により生産した。
Claims (11)
- 誘導性プロモーターの制御下で組換えタンパク質を発現する組換え細胞を用いた当該組換えタンパク質の生産方法であって、
前記組換え細胞を増殖させた培養液の一部に新鮮な培地を添加して連続的に培養することを含み、
前記組換えタンパク質の発現を誘導した組換え細胞を繰り返し使用しない、組換えタンパク質の生産方法。 - 前記組換え細胞の増殖と、前記組換えタンパク質の発現の誘導とが、異なる培養槽で行われる、請求項1に記載の組換えタンパク質の生産方法。
- 前記組換え細胞の増殖が、流加培養により行われる、請求項1又は2に記載の組換えタンパク質の生産方法。
- 誘導性プロモーターの制御下で組換えタンパク質を発現する組換え細胞を用いた当該組換えタンパク質の生産方法であって、
下記(A)〜(E)工程を繰り返すことを含む、組換えタンパク質の生産方法。
(A)前記組換え細胞を、培養槽で回分培養又は流加培養により増殖させる工程
(B)(A)工程での増殖後、前記培養槽の培養液の一部を受け入れ用の培養槽に移送する工程
(C)(B)工程での移送後、両培養槽のいずれか一方に新鮮な培地を添加して、(A)工程に進む工程
(D)(C)工程で(A)工程に進まなかったもう一方の培養槽で前記組換えタンパク質の発現を誘導し、前記組換えタンパク質を蓄積させる工程
(E)(D)工程で蓄積させた前記組換えタンパク質を、培養液から分離及び精製する工程 - 前記組換え細胞の増殖が対数増殖期の中期に達した時に、前記組換えタンパク質の発現の誘導を開始する、請求項1〜4のいずれか一項に記載の組換えタンパク質の生産方法。
- 前記組換えタンパク質の発現の誘導が、発現誘導剤を培養液に添加すること、又は培養液の温度を変えることによって行われる、請求項1〜5のいずれか一項に記載の組換えタンパク質の生産方法。
- (B)工程で受け入れ用の培養槽に移送する培養液の量が、培養液全量を基準として、80〜99体積%である、請求項4に記載の組換えタンパク質の生産方法。
- 前記組換え細胞が、前記組換えタンパク質をコードする遺伝子が染色体に組み込まれた細胞である、請求項1〜7のいずれか一項に記載の組換えタンパク質の生産方法。
- 前記組換えタンパク質が、構造タンパク質である、請求項1〜8のいずれか一項に記載の組換えタンパク質の生産方法。
- 前記構造タンパク質が、ケラチン、コラ−ゲン、エラスチン、レシリン、カイコシルク及びスパイダーシルクからなる群から選ばれるタンパク質由来のタンパク質である、請求項9に記載の組換えタンパク質の生産方法。
- 前記誘導性プロモーターが、T7プロモーター、tacプロモーター、trcプロモーター、lacプロモーター及びlacUV5プロモーターから選ばれるIPTG誘導性プロモーター、又はPRプロモーター及びPLプロモーターから選ばれる温度誘導性プロモーターである、請求項1〜10のいずれか一項に記載の組換えタンパク質の生産方法。
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