BPTIのプロリージョンは,折り畳みを容易にする
1Howard Hughes Medical Institute, Massachusetts Institute of Technology, Cambridge 02142.
Cell
|November 27, 1992
まとめ
牛の臓トリプシン阻害剤 (BPTI) のプロ領域は,タンパク質の折り畳みを著しく加速し,収穫量を増加させます. プロ領域の単一のシステインは,分子内反応剤として作用し,誤折り防止します.
科学分野:
- バイオケミストリー バイオケミストリー
- タンパク質の折りたたみ
- 分子生物学は分子生物学である.
背景:
- 牛の臓トリプシン阻害剤 (BPTI) の折り畳みは,in vitroでは遅いもので,数時間かかります.
- BPTI分子の半分は,非ネイティブの中間物質に誤った折り畳みをします.
- 生体内では,BPTIはシステインを含むアミノ端末プロ領域で合成されます.
研究 の 目的:
- タンパク質の折りたたみにおけるBPTIプロ領域の役割を調査する.
- プロ領域のシステイン残留物が二硫化物結合形成を促進するかどうかを判断する.
- BPTIの折りたたみ効率を改善するための方法を模索する.
主な方法:
- モデルシステムにおけるプロ-BPTIの再結合表現.
- インビトロ折りたたみ試験は,pH 7.3,25°Cで実施した.
- サイト・ディレクテッド・ミュータジェネシス (Site-directed mutagenesis) により,システインの必要性を評価する.
- 単一のシステインをBPTIに柔軟なリンク器を通じて結合する.
主要な成果:
- プロ-BPTIは,正常に折りたたまれたBPTIの速度と収量を in vitro で大幅に増加させました.
- プロ領域内のシステイン残留は,この折り畳み強化に不可欠です.
- 単一の結合システインは,二硫化物結合形成を助けるのに十分であった.
- プロ領域は,分子内チオル硫化物反応剤として作用する.
結論:
- BPTIプロ領域は,効率的かつ正確なタンパク質折り畳みを容易にする.
- 束縛されたシステイン残留物は,二硫化結合形成を改善するために,分子内反応剤として作用することができます.
- これらのメカニズムの理解は,タンパク質工学と治療用タンパク質生産に情報を与えることができます.
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