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首页> 外文期刊>IEEE transactions on nanobioscience >Spatial Distribution of the Electric Potential From Photosystem I Reaction Centers in Lipid Vesicles
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Spatial Distribution of the Electric Potential From Photosystem I Reaction Centers in Lipid Vesicles

机译:脂质囊泡中来自光系统I反应中心的电势的空间分布

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Photosynthetic reaction centers are integral membrane complexes that produce a net transmembrane charge separation in response to light. The Photosystem I (PSI) complex is a thoroughly studied reaction center that has been proposed as a nanoscale photovoltaic structure in diverse applications, including activation of excitable cells by triggering of voltage-gated ion channels. An electrostatic model of a spherical lipid vesicle embedded with PSI and suspended in an aqueous medium is presented. The distribution of the electric potential is obtained by solving the nonlinear Poisson–Boltzmann equation with the finite-element method. The model predicts a maximum potential difference of 1.3 V between charges. This value depends mostly on the intrinsic dielectric constants of the reaction center and distance between charges. However, the potential distribution near the reaction center depends on the ionic strength of the aqueous medium. When the ionic strength is zero, the vesicle develops a transmembrane potential that increases linearly with the density of reaction centers. When the ionic strength increases, this potential difference approaches to zero. The main results of the simulations are consistent with previously reported experimental data. Based on the presented results, the potential application of PSI to light activation of voltage-gated ion channels is discussed.
机译:光合反应中心是完整的膜复合物,可响应光而产生净跨膜电荷分离。光系统I(PSI)络合物是经过充分研究的反应中心,已被提出作为纳米级光伏结构用于多种应用,包括通过触发电压门控离子通道来激活可激发细胞。提出了一种球形脂质囊泡的静电模型,该脂质囊泡嵌入了PSI并悬浮在水性介质中。通过使用有限元方法求解非线性Poisson-Boltzmann方程获得电位分布。该模型预测电荷之间的最大电势差为1.3V。该值主要取决于反应中心的固有介电常数和电荷之间的距离。但是,反应中心附近的电势分布取决于水性介质的离子强度。当离子强度为零时,囊泡会形成跨膜电势,该电势随反应中心的密度线性增加。当离子强度增加时,该电势差接近零。模拟的主要结果与先前报道的实验数据一致。基于给出的结果,讨论了PSI在电压门控离子通道的光激活中的潜在应用。

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