菲科比利索姆蛋白 ApcG 与 PSII 相互作用,并调节神经囊中能量转移
Roberto Espinoza-Corral1,2, Masakazu Iwai3,4, Tomáš Zavřel5
1MSU-DOE Plant Research Laboratory, Michigan State University, East Lansing, MI 48824, USA.
Plant physiology
|November 16, 2023
概括
植物体链接蛋白ApcG对于蓝色细菌的光合作用至关重要,它与光系统II相互作用. 它的酸化调节了能量转移,在不同的光线条件下影响了生长.
科学领域:
- * 光合作用研究研究.
- * 蓝藻细菌的能量转移机制
- * 在光采集中的蛋白质与蛋白质相互作用.
背景情况:
- * 光合作用生物利用色素蛋白复合体,如蓝藻细菌中的 phycobilisomes (PBSs),以收集光.
- * PBS 将吸收的光能转移到甲状腺膜中的光系统 (PS).
- * 蛋白质相互作用调解了PBS与PS的关联,但特定的蛋白质仍然没有特征.
研究的目的:
- * 研究PBS链接蛋白ApcG在蓝藻细菌光合作用中的作用.
- *阐明ApcG与光系统之间的相互作用机制.
- * 探索ApcG酸化在能量转移中的调节功能.
主要方法:
- * 在Synechocystis sp.中对ApcG进行基因操纵. 这是PCC 6803.
- *在不同的光照条件下分析蓝色细菌生长.
- * 生物化学分析 (拉下) 和低温光光谱学.
主要成果:
- *ApcG通过其N端区域与光系统II (PSII) 进行特定的相互作用.
- *删除apcG会在限制光照条件下影响蓝藻细菌的生长.
- *ApcG的酸化模仿性降低了生长,并改变了PSII相互作用,影响了PSI光.
结论:
- * ApcG对于有效地将能量从PBS转移到PSII至关重要.
- *ApcG的酸化状态调节了PSII和PSI之间的能量分配.
- * ApcG在光纤细菌中优化光采集和光合作用方面发挥着关键作用.
相关概念视频
Photosystem I
62.5K
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...
62.5K
Photosystem II
70.7K
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...
70.7K
Photosystems
4.9K
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...
4.9K
The Photochemical Reaction Center
4.1K
Reaction centers are pigment-protein complexes that initiate energy conversion from photons to chemical entities. Therefore, photochemical reaction center is a more appropriate term that describes these complexes. The Nobel laureates Robert Emerson and William Arnold provided the first experimental evidence of photochemical reaction centers by demonstrating the participation of nearly 2,500 chlorophyll molecules for the release of just one molecule of oxygen. Despite thousands of photosynthetic...
4.1K
The Z-Scheme of Electron Transport in Photosynthesis
10.2K
The light reactions of photosynthesis assume a linear flow of electrons from water to NADP+. During this process, light energy drives the splitting of water molecules to produce oxygen. However, oxidation of water molecules is a thermodynamically unfavorable reaction and requires a strong oxidizing agent. This is accomplished by the first product of light reactions: oxidized P680 (or P680+), the most powerful oxidizing agent known in biology. The oxidized P680 that acquires an electron from the...
10.2K
Anoxygenic Photosynthesis
21
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...
21


