聚光大环之间的能量转移融入到双层膜中
Naoto Nagata1, Yusuke Kuramochi, Yoshiaki Kobuke
1Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0192, Japan.
Journal of the American Chemical Society
|December 18, 2008
概括
研究人员使用脂质体内的色素复合物创建了人工光采集系统. 这些系统通过在分子之间转移能量来模仿自然过程,类似于细菌收集光的天线.
科学领域:
- 超分子化学 超分子化学
- 摄影化学的使用.
- 生物模拟系统 生物模拟系统
背景情况:
- 人工光采集系统对于开发高效的太阳能转换技术至关重要.
- 模仿自然光合作用系统,如细菌采光天线,为设计新能源传输机制提供了一个有希望的策略.
研究的目的:
- 为了合成和表征两性双 ((imidazolyl) 三 ((porphyrinatozinc) 复合物与omega-carboxyalkyl替代物.
- 将这些氨酸复合物纳入脂质体双层膜,以创建有组织的,面向的结构.
- 研究这些嵌入膜系统中的能量转移动态及其与自然光采集组件的相似性.
主要方法:
- 制备两性双 (imidazolyl) 三 (porphyrinatozinc) 复合物. 这种复合物主要包括酸,酸,酸和酸.
- 氨酸巨环的融入脂肪体双层膜.
- 在引入富勒洛特里皮里迪尔配体时进行光灭研究.
- 在内置的氨酸复合体之间分析能量转移机制.
主要成果:
- 成功合成两性氨酸复合物与omega-carboxyalkyl meso替代物的成功合成.
- 桶型氨酸巨环的定向正常与脂质体膜表面.
- 在引入富勒烯联结物时观察到光火,表明有效的能量转移.
- 在天线宏环之间展示能量传输,模仿细菌光采集系统.
结论:
- 该研究成功创建了一个生物模拟光采集系统,使用氨酸-脂质体组件.
- 膜内的有组织结构促进了高效的能量传输,类似于自然系统.
- 这些发现为人工光合作用和能源采集设备的设计原则提供了洞察力.
相关概念视频
01:27Photosystem I
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...
01:15The Antenna Complex
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...
01:35Asymmetric Lipid Bilayer
Biological membranes show uneven distribution of different types of lipids in the inner and outer layers, resulting in transverse asymmetric membranes. The treatment of the erythrocyte membrane with the enzyme phospholipase confirmed the asymmetric nature of the lipid bilayer. The enzyme hydrolyzes lipids into fatty acids and hydrophilic groups. The phospholipase acts only on the outer layer of the membrane, while the inner layer remains intact. The phospholipase treatment resulted in 80%...
01:11Channel Rhodopsins
Most organisms use photoreceptors to sense and respond to light. Examples of photoreceptors include bacteriorhodopsins and bacteriophytochromes in some bacteria, phytochromes in plants, and rhodopsins in the photoreceptor cells of the vertebral retina. The light-sensitive property of these receptors is because of the bound chromophores, such as bilin in the phytochromes and retinal in the rhodopsins.
Rhodopsins belong to the family of cell surface proteins called G-protein coupled receptors,...
Rhodopsins belong to the family of cell surface proteins called G-protein coupled receptors,...
01:22Photosystem II
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 molecules...
The pigment molecules are arranged across two photosystem domains — the antenna complex and the reaction center. The main aim of the pigment molecules...
01:09Multi-pass Transmembrane Proteins and β-barrels
In multi-pass transmembrane proteins, the polypeptide chain crosses the membrane more than once. The transmembrane polypeptide chain either forms an α-helix or β-strand structure. α-Helix containing multi-pass transmembrane proteins are ubiquitous, whereas β-strand containing ones are mainly found in gram-negative bacteria, mitochondria, and chloroplasts.
α-Helix containing multi-pass transmembrane proteins
Multi-pass transmembrane proteins such as G-protein-linked receptors (GPCRs) and...
α-Helix containing multi-pass transmembrane proteins
Multi-pass transmembrane proteins such as G-protein-linked receptors (GPCRs) and...