Hopping Maps for Photosynthetic Reaction Centers().
Hopping Maps for Photosynthetic Reaction Centers().
复制标题
光合反应中心的跳跃图()。
DOI：
10.1016/j.ccr.2012.07.002
复制
发表时间：
2013
影响因子：
20.6
通讯作者：
Gray,HarryB
中科院分区：
文献类型：
--
作者：
Warren,JeffreyJ;Winkler,JayR;Gray,HarryB
光合反应中心（PRCs）采用多步隧道（跳跃）来分离电子和空穴，最终驱动新陈代谢所需的化学反应。我们最近开发的跳跃地图，可用于解释的速率和能量的电子/空穴跳跃在三个网站（供体-中间体-受体）隧穿反应，包括在PRCs。在这里，我们分析了几个关键的ET反应在PRC中，包括前向ET的L-分支，和跳跃，可能涉及的代谢性上坡中间体的M-分支，这是ET-无活性的体内。我们还探讨了电荷重组反应，这可能涉及跳跃。我们的跳跃图支持PRCs中的电子流涉及辅因子和重组能量之间的强电子耦合的观点，这些能量在生物学中是最低的（≤0.4eV）。
Photosynthetic reaction centers (PRCs) employ multiple-step tunneling (hopping) to separate electrons and holes that ultimately drive the chemistry required for metabolism. We recently developed hopping maps that can be used to interpret the rates and energetics of electron/hole hopping in three-site (donor–intermediate–acceptor) tunneling reactions, including those in PRCs. Here we analyze several key ET reactions in PRCs, including forward ET in the L-branch, and hopping that could involve thermodynamically uphill intermediates in the M-branch, which is ET-inactive in vivo. We also explore charge recombination reactions, which could involve hopping. Our hopping maps support the view that electron flow in PRCs involves strong electronic coupling between cofactors and reorganization energies that are among the lowest in biology (≤0.4eV).