JP6870851B2 - 機能的な一本鎖抗体の製造方法 - Google Patents
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Images
Description
(a)一本鎖抗体とフィブロインタンパク質との融合タンパク質を発現させた絹糸を精練せずに溶解する工程と、
(b)工程(a)で得られた前記融合タンパク質の溶解液を希釈して、前記融合タンパク質を線維化させることなく塩濃度を低下させる工程と、
を含む方法。
(a)一本鎖抗体とフィブロインタンパク質との融合タンパク質を発現させた絹糸を精練せずに溶解する工程と、
(b)工程(a)で得られた前記融合タンパク質の溶解液を希釈して、前記融合タンパク質を線維化させることなく塩濃度を低下させる工程と、
(c)工程(b)で得られた希釈された溶解液を担体に接触させる工程と
を含む方法。
本発明の「フィブロインH鎖」は、分子量が約35万Daのフィブロインタンパク質であり、典型例として、GenBankアクセッション No.NP_001106733.1で特定されるタンパク質のうちの22〜5263番目のアミノ酸配列からなるタンパク質(GenBankアクセッション No.NM_001113262.1で特定されるDNAのうちの64〜15789番目の塩基配列からなる遺伝子)が挙げられる。また、このタンパク質は、シグナルペプチド(GenBankアクセッション No.NP_001106733.1で特定されるタンパク質のうちの1〜21番目のアミノ酸配列からなるタンパク質)が前駆体より切断、除去されることにより得られる成熟型であるから、本発明の「フィブロインL鎖」としては、例えば、GenBankアクセッション No.NP_001106733.1で特定されるタンパク質(GenBankアクセッション No.NM_001113262.1で特定される遺伝子)が挙げられる。
(1)ヒトやマウスの免疫細胞において、シグナル伝達分子として機能することが知られているWiskott−Aldrich syndrome protein(WASP)に特異的なモノクローナル抗体を産生するハイブリドーマから全RNAを抽出し、SMARTTM RACE cDNA amplification kit(Clontech社)を用いて5’−RACE法によりモノクローナル抗体のH鎖及びL鎖の可変部(VH,VL)の遺伝子をクローニングした。VH及びVLのDNAフラグメントをフレキシブルなリンカー配列(GGGGS×3)を介して結合した一本鎖抗体(scFv)を構築した(図1)。
(1)野生型(W1)及び組換えカイコ(S01, K27)が産生した繭を9M臭化リチウム−90mM Tris−HClで溶解し、シルク溶液中の組換えタンパク質の発現量についてSDS−PAGEとクマシー染色により確認した。内在性フィブロインL鎖に対して、S01カイコ産生繭では約10%程度、K27カイコ産生繭では5−8%程度が組換えタンパク質に置き換わていると推測された(図4)。これらの数値は、フィブロインL鎖との融合タンパク質として組換えカイコで発現させた時の平均的な値である。
本発明により得られる一本鎖抗体やそれを結合させた担体は、例えば、様々な病原体の検出・同定、除去や、疾病診断を目的とした新しいバイオマテリアルとして有効である。
<223> 人工的なポリヌクレオチド配列
配列番号:2
<223> 人工的なポリペプチド配列
Claims (4)
- 抗原に対して結合活性を有する一本鎖抗体の製造方法であって、
(a)一本鎖抗体とフィブロインタンパク質との融合タンパク質を発現させた絹糸を精
練せずに溶解する工程と、
(b)工程(a)で得られた前記融合タンパク質の溶解液を希釈して塩濃度を低下させる工程と、
(c)線維化していない状態で前記融合タンパク質を含む、希釈された溶解液を回収する工程と、
を含む方法。 - 抗原に対して結合活性を有する一本鎖抗体を保持する担体の製造方法であって、
(a)一本鎖抗体とフィブロインタンパク質との融合タンパク質を発現させた絹糸を精
練せずに溶解する工程と、
(b)工程(a)で得られた前記融合タンパク質の溶解液を希釈して塩濃度を低下させる工程と、
(c)線維化していない状態で前記融合タンパク質を含む、希釈された溶解液を回収する工程と、
(d)工程(c)で回収された希釈された溶解液を担体に接触させる工程と
を含む方法。 - 分子内又は分子間の水素結合を切断する性質を有する溶液で絹糸を溶解する、請求項1または2に記載の製造方法。
- 前記フィブロインタンパク質が、フィブロインL鎖、フィブロインH鎖およびフィブロヘキサメリンからなる群から選択される少なくとも一のタンパク質であることを特徴とする、請求項1から3のいずれかに記載の製造方法。
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