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酵母プリオンにおけるコンフォーム的多様性は,その播種特異性を決定する
1Department of Cellular and Molecular Pharmacology, University of California-San Francisco, 94143-0450, USA.
Nature
|March 10, 2001
まとめ
プリオン株は,酵母 [PSI+] プリオンと同様に,タンパク質内の自己増殖の構成変化から生じる. これらの構造的変異は,プリオン行動と種間伝播障壁に影響を与えます.
科学分野:
- 分子生物学は分子生物学である.
- プリオン生物学の学科
- イースト遺伝学 イースト遺伝学
背景:
- プリオンは株の多様性を発揮し,同一の宿主でも異なるフェノタイプを生成します.
- プリオン菌株の多様性と種間伝播障壁の分子基礎は完全に理解されていません.
研究 の 目的:
- プリオン菌株の多様性における構造的差異の役割を調査する.
- これらの差異がプリオン伝送にどのように影響するか調べる.
主な方法:
- Saccharomyces cerevisiaeとCandida albicans Sup35.3のプリオン領域からキメリック融合タンパク質を作成しました.
- 暫定的な過剰発現によってインバイボで誘発されたプリオン菌株.
- 種を蒔いた試験を用いて,異なるアミロイド形状をインビトロで増殖させた.
主要な成果:
- キメリックSup35は,Sup35の開始種に依存して,体内で代替プリオン株を形成した.
- In vitroでは,キメラは,異なるSup35繊維で種を蒔いたときに,異なるアミロイド形状を繁殖させた.
- アミロイド繊維の形状は種子の特異性を決定し,種に依存する伝播を示しています.
結論:
- 遺伝性プリオン菌株は,プリオンタンパク質内の自己増殖の形状の違いから生じる.
- 主要なタンパク質構造とともに,形状的変異が,プリオンの種の伝播障壁を決定する.
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