藻の光システムIIの光収集アンテナ超複合体の色素タンパク質ネットワーク
Xiong Pi1, Songhao Zhao2,3, Wenda Wang2
1State Key Laboratory of Membrane Biology, Beijing Advanced Innovation Center for Structural Biology, School of Life Sciences, Tsinghua University, Beijing 100084, China.
まとめ
ディアトム
科学分野:
- 海洋生物学
- 光合成の研究
- 構造生物学
背景:
- ダイアトムは世界の原発生産性と 炭素循環に不可欠です
- 光合成装置は 変動する光の条件に適応します
- 藻類の光採集の理解は 藻類の生態学的役割の鍵です
研究 の 目的:
- フォトシステムII (PSII) -フコザンチン (Fx) クロロフィル (Chl) a/c結合タンパク質 (FCPII) 超複合体の構造を決定する.
- 光の効率的な管理のために,超複合体内の色素の配置を明らかにします.
主な方法:
- 高解像度構造を得るために,冷凍電子顕微鏡 (cryo-EM) が使用されました.
- この研究は,PSII核および関連するタンパク質を含む超複合構造に焦点を当てた.
主要な成果:
- 2つのプロトメアで構成された超複合体です.
- 各プロトメアには,複数のFCPII単位 (テトラメリックおよびモノメリック) によって囲まれたPSIIコアがあります.
- 光を効率的に捕捉し 伝達し 散らばらせるために 大きな色素ネットワークが組織されています
結論:
- 決定された構造は,藻の光採集複合体に対する原子レベルの洞察を提供します.
- この構造的な理解は,光合成の効率を 変数の光の下で説明する.
- この発見は,藻類の適応と地球生物化学のサイクルにおけるその役割を理解するのに寄与しています.
関連する概念動画
Photosystem I
69.5K
Although structurally similar to photosystem II (PSII), photosystem I (PSI) is has a different electron supplier and electron acceptor.
Both these photosystems work in concert. An excited electron from PSII is relayed to PSI via an electron transport chain in the thylakoid membrane of the chloroplast, which is comprised of the carrier molecule plastoquinone, the dual-protein cytochrome complex, and plastocyanin. As electrons move between PSII and PSI, they lose energy and must be re-energized...
Both these photosystems work in concert. An excited electron from PSII is relayed to PSI via an electron transport chain in the thylakoid membrane of the chloroplast, which is comprised of the carrier molecule plastoquinone, the dual-protein cytochrome complex, and plastocyanin. As electrons move between PSII and PSI, they lose energy and must be re-energized...
69.5K
Photosystem II
78.5K
The multi-protein complex photosystem II (PS II) harvests photons and transfers their energy through its bound pigments to its reaction center, and ultimately to photosystem I (PSI) through the electron transport chain. The pigments responsible for caputirng the light energy in photosystems include chlorophyll a, chlorophyll b, and carotenoids.
The pigment molecules are arranged across two photosystem domains — the antenna complex and the reaction center. The main aim of the pigment...
The pigment molecules are arranged across two photosystem domains — the antenna complex and the reaction center. The main aim of the pigment...
78.5K
Protein Networks
4.5K
An organism can have thousands of different proteins, and these proteins must cooperate to ensure the health of an organism. Proteins bind to other proteins and form complexes to carry out their functions. Many proteins interact with multiple other proteins creating a complex network of protein interactions.
These interactions can be represented through maps depicting protein-protein interaction networks, represented as nodes and edges. Nodes are circles that are representative of a protein,...
These interactions can be represented through maps depicting protein-protein interaction networks, represented as nodes and edges. Nodes are circles that are representative of a protein,...
4.5K
Protein Networks
2.8K
2.8K
Photosystems
7.0K
Photosystems are multiprotein complexes that form the functional units of photosynthesis in plants, algae, and cyanobacteria. They are found embedded in the membrane of tiny sac-like structures called thylakoids placed inside the chloroplast.
Functioning of Photosystems
Photosystems contain many pigment molecules, such as chlorophylls and carotenoids, arranged in a particular organization across two domains — the antenna complex and the reaction center. The main aim of the pigment...
Functioning of Photosystems
Photosystems contain many pigment molecules, such as chlorophylls and carotenoids, arranged in a particular organization across two domains — the antenna complex and the reaction center. The main aim of the pigment...
7.0K
The Antenna Complex
7.7K
Plants and other photosynthetic organisms comprise pigments capable of absorption of direct sunlight. These pigments are present in the reaction center - the main site of photochemical reactions as well as in the antenna complex. Under average light conditions, the rate at which reaction center pigments absorb light is far below the electron transport chain's capacity. As a result, the reaction center alone cannot provide enough energy to drive photosynthesis. The photosynthetic efficiency can...
7.7K


