KDEL受容体によるゴルギのERタンパク質のpH依存的回収の構造的基礎
Philipp Bräuer1, Joanne L Parker1, Andreas Gerondopoulos1
1Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK.
まとめ
この研究は,KDEL受容体の構造を明らかにし,これは,ゴルギ装置からエンドプラズマ網膜 (ER) のタンパク質を回収するのに不可欠です. トランスポーターのようなメカニズムとpH依存の相互作用は,真核細胞における効率的なタンパク質回収を保証する.
科学分野:
- 細胞生物学
- 構造生物学
- 生物化学
背景:
- エンドプラズマ網 (ER) とゴルギ細胞間の選択的タンパク質輸送は,真核細胞にとって不可欠である.
- ゴルギからER光タンパク質の回収は,KDEL受容体によるLys-Asp-Glu-Leu (KDEL) 信号のpH依存認識に依存する.
研究 の 目的:
- KDEL受容体によるpH依存のKDEL信号認識の構造的基礎を解明する.
- 分泌経路内のタンパク質回収に伴う構造変化を理解する.
主な方法:
- 鶏のKDEL受容体の構造を異なる状態 (apo ER,KDEL結合のGolgi,およびsybody複合体) で決定するためにX線結晶学を用いた.
- in vitro結合測定と in vivo細胞局所化試験が行われました.
主要な成果:
- 結晶構造はKDEL受容体のトランスポーターのような構造を明らかにした.
- KDEL結合は重要な形状の変化を誘導する.
- KDEL信号認識に不可欠なpH依存の相互作用ネットワークが特定されました.
結論:
- KDEL受容体はpH依存のトランスポーターとして機能し,ERタンパク質の回収を促進します.
- 構造的な洞察は,分泌経路におけるpH依存の回収システムのメカニズムを説明する.
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