2.72 A解像度のスパナッチメジャー光集集複合体の結晶構造
Zhenfeng Liu1, Hanchi Yan, Kebin Wang
1National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Chaoyang District, Beijing 100101, People's Republic of China.
Nature
|March 19, 2004
まとめ
光システムII (LHC-II) の主要な光集集複合体は,その原子構造をプロテオリポソームで明らかにしている. この構造は,LHC-IIにおけるクロロフィールとカロテノイドが,植物における効率的な光収集と光保護をどのように可能にするかを明らかにする.
科学分野:
- 植物生物学 植物生物学
- 光合成の研究研究である.
- 構造生物学 構造生物学とは
背景:
- 光システムII (LHC-II) の主要な光集集複合体は,植物における光捕捉と光保護に不可欠である.
- LHC-IIの構造を理解することは,光合成の効率と光への植物適応の解明の鍵です.
研究 の 目的:
- イコサヘドール型プロテオリポソームアセンブリ内のLHC-IIの高解像度X線構造を決定する.
- LHC-II機能におけるクロロフィールとカロテノイドの配置と役割を解明する.
主な方法:
- X線結晶学を用いて,LHC-II.IIの原子構造を取得しました.
- プロテオリポソームアセンブリは,LHC-IIをネイティブのような環境に埋め込むために使用されました.
- クロロフィールとカロテノイドの位置と向きの詳細な分析.
主要な成果:
- 構造は,非対称単位あたり10個のLHC-IIモノマーを示している.
- 各モノメアには14個のクロロフィル (8 Chla, 6 Chlb) と4つのカロテノイド結合部位が含まれています.
- クロロフィルb分子は,モノメア-モノメア界面に濃縮され,光の採集を容易にします.
- インターフェースのカロテノイドは,エネルギー分散に役割を果たす可能性があります.
結論:
- 原子の構造は,LHC-IIの組織に前例のない洞察を与えてくれます.
- 染料の配置は,効率的な光収集と潜在的な光保護機構をサポートします.
- この構造データは,光合成と植物の適応戦略の理解を深める.
関連する概念動画
Photosystem II
59.9K
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...
59.9K
Photosystem I
52.8K
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...
52.8K
Photoreceptors and Plant Responses to Light
22.5K
Light plays a significant role in regulating the growth and development of plants. In addition to providing energy for photosynthesis, light provides other important cues to regulate a range of developmental and physiological responses in plants.
22.5K
X-ray Crystallography
21.6K
The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
21.6K
The Antenna Complex
6.9K
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...
6.9K
Super-resolution Fluorescence Microscopy
12.3K
Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been...
12.3K


