JP5415270B2 - 食肉植物を用いた組換えタンパク質の生産のための方法 - Google Patents
食肉植物を用いた組換えタンパク質の生産のための方法 Download PDFInfo
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Description
一部の食肉植物、特に嚢状葉(pitchers)または嚢(bladders)の形態のトラップを有するものでは、かなりの量の消化分泌液が産生され、外部環境に対して閉鎖されているトラップ中に排出される;このトラップは、餌を消化する準備ができて初めて外部環境に対して開く。たとえ食肉植物を非無菌環境において成長させたとしても、そのトラップの準備期間中に、消化液は天然に無菌条件下で排出される。トラップが開く前に消化分泌液を収集し、いくつかの事前準備をすることを条件として、組換えタンパク質の収集はある特定の生産方法において無菌条件下で行うことができる。
用語「医薬」タンパク質とは、ヒト疾患または獣医学的疾患を治療するための製造承認を受けた任意のタンパク質を意味する。かかる医薬タンパク質には、特にタンパク質ホルモン(性ホルモン、成長ホルモンなど)、酵素、抗体(特にモノクローナル抗体)などが含まれる。
サンプル中での出現が疾患の存在を示すタンパク質に対する抗体、例えば、微生物または癌を検出することを可能にする病原微生物抗原または腫瘍抗原に対する抗体など;
疾患が生じたときに特異的に発現されるタンパク質、例えば、対象におけるこれらのタンパク質に対する抗体の存在の検出、結果として該疾患の診断を可能にする病原微生物のタンパク質など
が含まれる。
2/膜結合リボソームの助けを借りてER付近で(完全にまたは部分的に)起こり得るmRNAのタンパク質への翻訳。例えば、ある特定のタンパク質の場合、N末端部に数十個のアミノ酸の疎水性シグナル配列が存在する。翻訳プロセス中に、細胞質SRP(シグナル認識タンパク質)はリボソームの表面と結合し、それにより翻訳プロセスが停止する。リボソームと結合したSRP粒子は、それ自体が小胞体膜表面上の受容体と結合する。こうして、前記タンパク質の疎水性シグナル配列はER膜を通過する。翻訳が再び開始し、その後、内腔内で前記タンパク質が放出される(19)。
1.1 材料と方法
1.1.1.GFP遺伝子またはGUS遺伝子でのモウセンゴケ植物の形質転換
モウセンゴケ属形質転換は、Hirsikorpi et al.によって記載されているように、T−DNAの植物細胞への移入を実施するために、葉を傷つけ、それらの葉をAgrobacterium tumefaciensと同時培養して、葉から誘導した。本発明者らのケースでは、前記植物の形質転換は、異なるマーカー遺伝子を含む2つの異なるプラスミドの構築を用いて行った。
紫外線によって励起させたときに可視範囲において蛍光を発する(395nm)、クラゲ(Aequorea victoria)由来のGFP、緑色蛍光タンパク質をコードする遺伝子、または
X−Gluc基質(5−ブロモ−4−クロロ−3−インドリル−β−D−グルクロン酸)の存在下で青色の生成物の出現をもたらす、GUS酵素、β−グルクロニダーゼをコードする遺伝子
のいずれかを含めた。
X−Gluc原液をX−Glucバッファー(100mM Tris HCl、NaCl 50mM、pH7)で希釈して、終濃度1mMを得、それを前記植物部位に直接適用した。次いで、これを 37℃で12時間暗所に置いた。その後、これらの葉をエタノール浴に浸漬して、葉緑素を除去し、GUS酵素が存在する可能性によって起こる青色染色がよりよく示された。
1.2.1 GFP形質転換モウセンゴケ植物
1.2.1.1 紫外線顕微鏡下での葉の観察結果
対照食肉植物およびGFP形質転換食肉植物のリーフリム(Leaf limbs)を紫外線顕微鏡下で観察した。ある特定のGFP形質転換葉は著しい蛍光領域を示したが(図1Aおよび1B、矢印参照)、一方、対照植物の葉は蛍光を示さなかった(図1C):
顕微鏡下でのこれらの観察結果は、モウセンゴケ植物がGFP形質転換を受け、リーフリムにおいてGFPタンパク質を発現したことを示している。
次いで、昆虫消化酵素を分泌する腺を有する葉の腺毛の観察結果およびこれらの腺によって産生されるグルーまたは粘液の液滴の観察結果に対して蛍光調査を行った。
グルー液滴においてGFPタンパク質が存在する可能性を見るために、シガレットペーパーを小さな正方形に切って、対照植物およびGFP植物の葉を軽くこすり、シガレットペーパーへグルーを吸収させた。
1.2.2.1 X−Gluc基質とのインキュベーション後の葉の観察結果
モウセンゴケ植物が実際に形質転換されたことを検証するために、恐らく形質転換されたであろう2植物の葉および対照葉をX−Gluc基質とともにインキュベートした。
インキュベーション後にこれらの対照葉およびGUS葉を単対物双眼顕微鏡下で観察して、青色染色を確かめまたは正確に位置づけた。
GFP植物の場合と同様に、GUS植物および対照植物のグルー液滴を、今回はWhatman社製ペーパー(ペーパーで液滴を軽くこすり、できる限り多く吸収させた)を用いて吸収させた。次いで、これらのペーパー片をバッファーおよびX−Gluc基質中で37℃で12時間インキュベートした。
同じT−DNA断片上に存在する2つの遺伝子を用いて植物を形質転換した:GUS遺伝子およびカナマイシン耐性遺伝子(NPTII)(培養培地に抗生物質を添加することにより植物選抜が可能になる)。実際には、植物がカナマイシン耐性遺伝子を組み込んだならば、その植物はカナマイシン含有培地中で生存し、一方、形質転換を受けていない植物は死滅し、その結果形質転換植物が選抜される。
上に示した結果は、対象となるタンパク質の遺伝子が挿入された遺伝子改変食肉植物を生みだすことができ、そして該植物によって排出されたトラップの消化分泌液から(本明細書においてはグルーから)対象となるタンパク質を容易に採取することができることを明確に示している。
Claims (24)
- 食肉植物の栽培を含んでなる、少なくとも1つのタンパク質を生産するための方法であって、該植物は該タンパク質またはタンパク質群を発現するように遺伝子改変されており、該タンパク質またはタンパク質群は該食肉植物トラップの消化分泌液から収集されることを特徴とする、方法。
- 前記タンパク質またはタンパク質群が、前記植物の細胞中で発現され、前記植物の天然タンパク質自然排出システムによって排出される、請求項1に記載の方法。
- 前記植物が、餌捕獲を擬態し、かつ前記植物がトラップ中にタンパク質を産生し排出する前記システムの活性化を誘導する化学的刺激に付される、請求項2に記載の方法。
- 前記植物が、餌捕獲を擬態し、かつ前記植物がトラップ中にタンパク質を産生し排出する前記システムの活性化を誘導する機械的刺激にさらに付される、請求項3に記載の方法。
- 前記植物が、餌捕獲を擬態し、かつ前記植物がトラップ中にタンパク質を産生し排出する前記システムの活性化を誘導する、いずれの化学的刺激および/または機械的刺激の不在下で栽培される、請求項2に記載の方法。
- 前記植物が、アグロバクテリウム属、バイオリスティック、エレクトロポレーション、マイクロインジェクション、またはウイルスベクターの使用による形質転換によって遺伝子改変されている、請求項1〜5のいずれか一項に記載の方法。
- 前記タンパク質が、獣医用もしくはヒト用の医薬品、化粧品、植物用医薬品、診断薬、栄養補助剤または実験用試薬から選択される、請求項1〜6のいずれか一項に記載の方法。
- 前記食肉植物による1以上の消化酵素の合成阻害をさらに含む、請求項1〜7のいずれか一項に記載の方法。
- 合成が阻害される前記消化酵素のうちの少なくとも1つがプロテアーゼである、請求項8に記載の方法。
- 前記食肉植物による1以上の消化酵素の合成阻害が、前記植物のゲノムからの少なくとも1つの消化酵素遺伝子の欠失、サイレンシングによる少なくとも1つの消化酵素遺伝子の転写スイッチオフ、および/または少なくとも1つの消化酵素阻害遺伝子の異所発現から選択される遺伝子技術によって実施される、請求項8または請求項9に記載の方法。
- 前記食肉植物による1以上の消化酵素の合成阻害が、該消化酵素もしくは消化酵素群を阻害する溶液を前記トラップの消化液に直接加えること、または該消化液のpH条件および/または温度条件を制御することによって行われる、請求項8または請求項9に記載の方法。
- 前記タンパク質が、小胞体への輸送を可能にするペプチドシグナル配列を含む、請求項1〜11のいずれか一項に記載の方法。
- 前記食肉植物が、少なくとも1つのSNARE型ドメインを含む少なくとも1つの遺伝子を発現するようにさらに遺伝子改変される、請求項1〜11のいずれか一項に記載の方法。
- 前記食肉植物が、グルートラップを有する、請求項1〜13のいずれか一項に記載の方法。
- グルートラップを有する前記食肉植物が、モウセンゴケ属、ムシトリスミレ属、ビブリス属、ドロソフィルム属、およびトリフィオフィルム属から選択される、請求項14に記載の方法。
- 前記タンパク質が、前記植物の浸漬、噴霧もしくは洗浄によって前記トラップから前記グルーを採取することによって;前記植物の前記グルーの布帛への吸引もしくは吸収によって;または前記グルーの直接収集によって得られる、請求項14または請求項15に記載の方法。
- 前記植物が、一連の植物を操作することが可能な固定システムで栽培され、ひっくり返され、それらの地上部が溶液に浸漬される、請求項16に記載の方法。
- 前記植物が、防水性材料で覆われた斜面で栽培され、前記トラップの前記グルーが、前記植物の地上部に噴霧および/または洗浄することによって採取され、得られた溶液が該斜面の下部で収集される、請求項16に記載の方法。
- 前記食肉植物が、嚢状葉、トランペット状葉または嚢トラップを有する、請求項1〜13のいずれか一項に記載の方法
- 前記タンパク質が、前記嚢状葉、トランペット状葉または嚢内部で見出される排出液を採取することによって得られる、請求項19に記載の方法。
- 嚢状葉トラップを有する前記食肉植物が、ウツボカズラ属またはセファロタス属から選択される、請求項19に記載の方法。
- 前記嚢状葉内部で見出される前記液体が、前記植物の嚢状葉が自然に開く前に採取される、請求項20または請求項21に記載の方法。
- 前記嚢状葉内部の前記液体が、前記嚢状葉を犠牲にすることによって、または無菌条件下で前記嚢状葉内部の前記液体への穿刺を可能にする装置を使用することによって採取される、請求項22に記載の方法。
- 前記嚢状葉内部の前記液体が、前記植物によって産生される天然プロテアーゼが前記液体中に大量に蓄積されていない前記植物成長段階において採取される、請求項20〜23のいずれか一項に記載の方法。
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FR2991326B1 (fr) | 2012-05-29 | 2017-09-01 | Plant Advanced Tech Pat | Enzymes de bioconversion de l'acide chlorogenique en au moins un acide di-, tri- ou tetra-cafeoylquinique |
KR102476601B1 (ko) * | 2013-03-15 | 2022-12-13 | 네페택스, 엘엘씨 | 글루텐 불내증 및 관련 질병의 치료 |
CN114793895B (zh) * | 2022-04-19 | 2023-02-24 | 西南林业大学 | 小太阳瓶子草组织培养方法及应用 |
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DE2920631C2 (de) | 1979-05-22 | 1986-04-10 | Carnivora International Establishment, Vaduz | Verwendung des Preßsaftes von Dionaea muscipula zur Krebsbekämpfung und Verfahren zur Herstellung eines Krebsmittels auf der Basis eines solchen Preßsaftes |
WO1999016890A2 (en) * | 1997-09-30 | 1999-04-08 | The Regents Of The University Of California | Production of proteins in plant seeds |
US6096546A (en) * | 1998-01-30 | 2000-08-01 | Board Of Trustees, Rutgers, The State University Of New Jersey | Methods for recovering polypeptides from plants and portions thereof |
AU3029799A (en) | 1998-02-23 | 1999-09-06 | Helmut Keller | Use of a press-juice, digestive juice or extract of carnivorous plants for inhibiting protein kinases |
IL157006A0 (en) * | 2001-01-17 | 2004-02-08 | Univ Ramot | Chitinases, derived from carnivorous plants, polynucleotide sequence encoding thereof, and methods of isolating and using same |
EP1525319A1 (en) * | 2002-07-29 | 2005-04-27 | Universit Laval | Method for enhancing the nutritive value of plant extract |
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- 2007-08-29 CN CN2007800417785A patent/CN101600799B/zh not_active Expired - Fee Related
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ATE537262T1 (de) | 2011-12-15 |
AU2007304398A1 (en) | 2008-04-10 |
FR2906818B1 (fr) | 2012-04-27 |
US8178749B2 (en) | 2012-05-15 |
JP2010505401A (ja) | 2010-02-25 |
CA2665286A1 (en) | 2008-04-10 |
EP2074216B1 (en) | 2011-12-14 |
NZ576488A (en) | 2011-12-22 |
WO2008040599A1 (en) | 2008-04-10 |
CA2665286C (en) | 2016-02-23 |
AU2007304398B2 (en) | 2011-12-01 |
FR2906818A1 (fr) | 2008-04-11 |
US20100047864A1 (en) | 2010-02-25 |
EP2074216A1 (en) | 2009-07-01 |
CN101600799B (zh) | 2012-11-07 |
CN101600799A (zh) | 2009-12-09 |
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