Rhodopseudomonas palustrisからのRC-LH1コア複合体の結晶構造
Aleksander W Roszak1, Tina D Howard, June Southall
1Department of Chemistry, Institute of Biomedical and Life Sciences, University of Glasgow, Glasgow G12 8QQ, UK.
Science (New York, N.Y.)
|December 13, 2003
まとめ
反応センター・ライト・ハービスティング1 (RC-LH1) 核複合体の結晶構造は,LH1複合体の隙間を明らかにしている. この構造的特徴は,ユビキノン (UQB) の電子移転をシトクロームb/c1.1.に容易にする可能性がある.
科学分野:
- 構造生物学 構造生物学とは
- 光合成細菌 バクテリア
- バイオケミストリー バイオケミストリー
背景:
- 反応センター-光採集1 (RC-LH1) 核複合体は,細菌の光合成に不可欠である.
- RC-LH1コンポーネントの空間的配置を理解することは,電子伝送経路の解明の鍵です.
研究 の 目的:
- Rhodopseudomonas palustris.からのRC-LH1コア複合体の高解像度の結晶構造を決定する.
- 電子伝送プロセスを調節する構造的特徴を特定する.
主な方法:
- 4.8アングストームの解像度のX線結晶学.
- RC-LH1複合体内のタンパク質と色素の組織の分析.
主要な成果:
- RC-LH1複合体は,その核に反応センターを置いて,円形の構造を形成します.
- 光採集1 (LH1) 複合体は15組のトランスメブランの螺旋状アポタンパク質とバクテリオクロロフィールで構成されています.
- 単一のトランスメブランヘリクスは,RCの周りのLH1複合体の完全な閉塞を妨げます.
結論:
- ユビキノン (UQB) 結合部位の近くにあるLH1複合体の観察された構造破裂は,おそらく機能的なポータルとして機能する.
- この構造的ギャップは,UQBから citochrome b/c1複合体への電子の転送を容易にし,光合成電子輸送鎖の重要なステップです.
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