光学系II核のリン酸化と光合成の適応には,2つの異なるタンパク質キナーゼが必要である
Vera Bonardi1, Paolo Pesaresi, Thomas Becker
1Botanisches Institut, Department Biologie I, Ludwig-Maximilians-Universität, Menzinger Strasse 67, 80638 München, Germany.
Nature
|October 21, 2005
まとめ
光合成による光の適応には,タンパク質のリン酸化が含まれます. STN7キナーゼは状態移行を調節し,STN8キナーゼは光学系IIの核タンパク質をリン酸化し,遺伝子発現とエネルギー分布に影響を与えます.
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.
- 分子植物生理学 分子植物生理学
背景:
- 照明の変化は,チラコイドタンパク質の改変と光合成機構の再編成を誘発する.
- 短期的な適応には,光システムII (PSII) と光採集タンパク質 (LHCII) のリン酸化が含まれており,PSIIの回転と興奮エネルギー再分配 (状態移行) に影響します.
- 長期的適応には,光学系ステキオメトリーを調整して,エネルギー分布を均衡させる必要がある.
研究 の 目的:
- アラビドプシスの光合成適応におけるSTN7およびSTN8タンパク質キナーズの役割を調査する.
- PSIIの修復と適応のためにSTN8によるPSIIコアタンパク質のリン酸化の必要性を決定する.
- 短期的および長期的光合成適応の結合を解明する.
主な方法:
- STN7およびSTN8キナーゼが欠けているアラビドプシスの変異体の分析.
- 高強度光の下でのPSII活動とD1タンパク質の周回量の評価.
- 光の質の変化への適応の評価.
主要な成果:
- STN8は,PSIIコアタンパク質の定量的リン酸化に不可欠ですが,STN8の欠如は,高光下でのPSII活動とD1のターンオーバーにわずかな影響を及ぼします.
- STN8ではなくSTN7は,光の質の変化への適応に必要なものです.
- stn7変異体における適応の欠陥は,短期的および長期的光合成適応の結合を示唆する.
結論:
- PSII修復には,可逆性タンパク質リン酸化が不可欠ではない.
- STN7キナーゼは,状態転換と光合成遺伝子発現の制御の両方で重要な役割を果たし,短期的および長期的適応を結び付けています.
- LHCIIまたは未知のSTN7基質のリン酸化は,光合成遺伝子発現の調節に不可欠である.
さらに関連する動画
08:40Separation of Spinach Thylakoid Protein Complexes by Native Green Gel Electrophoresis and Band Characterization using Time-Correlated Single Photon Counting
Published on: February 14, 2019
7.2K
07:10Purification of Active Photosystem I-Light Harvesting Complex I from Plant Tissues
Published on: February 3, 2023
1.5K
関連する概念動画
01:22Photosystem 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
01:27Photosystem 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
01:46The Calvin Benson Cycle
6.3K
Ribulose 1,5- bisphosphate carboxylase/oxygenase (RuBisCo) is a critical enzyme that catalyzes carbon dioxide assimilation during photosynthesis. However, it is an inefficient enzyme, having an extremely slow catalytic rate. A typical enzyme can process about a thousand molecules per second; however, RuBisCo fixes only around three-carbon dioxides per second. Photosynthetic cells compensate for this slow rate by synthesizing very high amounts of RuBisCo, making it the most abundant single...
6.3K
01:32Photosystems
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
01:30Anoxygenic Photosynthesis
1.9K
Anoxygenic photosynthesis is a phototrophic process that captures light energy to drive carbon fixation without producing molecular oxygen. Unlike oxygenic photosynthesis, which utilizes water as an electron donor and releases oxygen, anoxygenic phototrophs use alternative electron donors such as hydrogen sulfide (H₂S), elemental sulfur (S⁰), or thiosulfate (S₂O₃²⁻). This process is carried out by diverse groups of bacteria, including purple bacteria, green...
1.9K
01:26Oxygenic Photosynthesis
994
Oxygenic photosynthesis is a fundamental process in which light energy is harnessed to drive the oxidation of water, leading to the production of molecular oxygen (O₂), adenosine triphosphate (ATP), and nicotinamide adenine dinucleotide phosphate (NADPH). This process is essential for sustaining aerobic life on Earth and is primarily carried out by cyanobacteria, algae, and plants. The core of oxygenic photosynthesis lies in the thylakoid membranes, where chlorophyll pigments facilitate...
994