アンジオテンシノゲンのリドックス・スイッチは,アンジオテンシン放出を調節する
Aiwu Zhou1, Robin W Carrell, Michael P Murphy
1Department of Haematology, Cambridge Institute for Medical Research, University of Cambridge, Hills Road, Cambridge CB2 0XY, UK. awz20@cam.ac.uk
Nature
|October 8, 2010
まとめ
血圧の調節には,構造が変化するタンパク質であるアンジオテンシンオゲンが含まれる. この酸化還元反応型からより活発な形態への移行は,特に子宮頸炎前期において,血圧調節に寄与する可能性があります.
科学分野:
- バイオケミストリー バイオケミストリー
- 分子生物学は分子生物学である.
- 生理学 生理学とは
背景:
- 血圧は,アンジオテンシンから派生したアンジオテンシンによって調節されます.
- アンジオテンシンオゲンは以前,レニンの受動的基板と考えられていた.
- 酵素レニンはアニオテンシンオゲンを割って,血管圧縮ペプチドを放出します.
研究 の 目的:
- レニンによる血管新生素活性化の構造的基礎を解明する.
- 血圧制御におけるアンジオテンシノゲン構成の役割を調査する.
- 血管新生素活性における酸化還元依存的調節を調査する.
主な方法:
- X線結晶学で,ヒトの血管新生素とその複合体とレニンの構造を決定する.
- アンジオテンシン分裂部位に影響する形状の変化の分析.
- 循環中の血管新生素のリドックス状態の評価.
主要な成果:
- アンジオテンシンゲンのアンジオテンシン分裂部位は,本来の状態に埋まっている.
- 保存された二硫化物ブリッジは,分裂部位を露出させる形状の変化をリンクしています.
- アンジオテンシンオゲンは,循環中の2つのリドックス状態で存在し,酸化された形態は好ましくレニンを結合します.
- 妊娠前出血症では,活性型,橋渡し型への酸化スイッチが観察される.
結論:
- アンジオテンシノゲンのリドックス反応型型変異は,アンジオテンシン放出を調節する.
- このメカニズムは,血圧調節に寄与する.
- 酸化スイッチは,妊娠前出血症の高血圧危機に関与しています.
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