Excited-State Reaction Dynamics of Bacteriochlorophyll Dimers

细菌叶绿素二聚体的激发态反应动力学

基本信息

  • 批准号:
    0091210
  • 负责人:
  • 金额:
    $ 33万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2001
  • 资助国家:
    美国
  • 起止时间:
    2001-06-01 至 2004-05-31
  • 项目状态:
    已结题

项目摘要

Beck, Warren F.MCB-0091210Photosynthesis is responsible for most of the biological energy and oxygen on this planet. The first event in photosynthesis is primary charge separation at the reaction center chlorophyll pair. This research program will employ femtosecond coherent Raman spectroscopy to study the excited-state vibrational motions of bacteriochlorophyll dimers. The experimental focus is on the pair of bacteriochlorophylls in the B820 subunit of the purple bacterial light-harvesting protein LH1. B820 shares many of the structural features of the primary electron donor P of the purple bacterial reaction center. The research plan is designed to test the hypothesis that bacteriochlorophyll dimers undergo a nearly barrierless adiabatic surface crossing to a charge-transfer state following excitation of the lower exciton state. The main idea is that certain normal modes of vibration of the bacteriochlorophyll monomer and possibly collective modes of the bacteriochlorophyll dimer serve to mix electronic charge-transfer states with the neutral dimer exciton states. Femtosecond coherent Raman spectroscopy will be conducted with impulsive pump-probe and transient grating methods to detect the vibrational modes that mix the neutral and charge-transfer excited states of the bacteriochlorophyll dimer. The Raman spectra that are obtained with the B820 system will be compared with those that are observed in B777, the monomeric species that is prepared by splitting B820 into single bacteriochlorophyll-polypeptide complexes. In addition, synthetic alpha and beta polypeptides will be used to prepare pure systems containing alpha, beta and beta2 hosts for bacteriochlorophyll dimers. The research program will address how photosynthesis involves paired chlorophyll structures. In broader terms the work will address the role of vibrational coherence in fast chemical reactions in proteins.
Beck,Warren F.MCB-0091210光合成负责这个星球上大部分的生物能源和氧气。光合作用中的第一个事件是反应中心的叶绿素对的初级电荷分离。这项研究计划将使用飞秒相干拉曼光谱来研究细菌叶绿素二聚体的激发态振动运动。实验的重点是紫色细菌捕光蛋白LH1的B820亚基中的一对细菌叶绿素。B820具有紫色细菌反应中心初级电子供体P的许多结构特征。这项研究计划旨在检验这样一个假设,即在激发低激子态后,细菌-叶绿素二聚体经历了几乎无障碍的绝热表面穿越到电荷转移状态。其主要思想是,细菌叶绿素单体的某些正常振动模式和可能的细菌叶绿素二聚体的集体模式用于混合电子电荷转移态和中性二聚体激子态。飞秒相干拉曼光谱将用脉冲泵浦探测和瞬时光栅法来探测混合了细菌-叶绿素二聚体的中性和电荷转移激发态的振动模式。用B820系统获得的拉曼光谱将与在B777中观察到的拉曼光谱进行比较,B777是通过将B820分解成单个细菌-叶绿素-多肽复合体而制备的单体物种。此外,合成的α和β多肽将用于制备含有细菌叶绿素二聚体的α、β和β2宿主的纯体系。该研究计划将解决光合作用如何涉及成对的叶绿素结构。更广泛地说,这项工作将解决振动连贯性在蛋白质快速化学反应中的作用。

项目成果

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Warren Beck其他文献

Spatiotemporal relationship between temperature and precipitation in inland China from meteorological data and paleoclimatic implications for lacustrine oxygen records
气象数据分析中国内陆气温与降水的时空关系及其对湖相氧记录的古气候意义
  • DOI:
    10.1016/j.quaint.2014.08.005
  • 发表时间:
    2014-10
  • 期刊:
  • 影响因子:
    2.2
  • 作者:
    Tian Feng;Weijian Zhou;Warren Beck;Yajuan Du;Lijuan Sha
  • 通讯作者:
    Lijuan Sha
Recent progress of 10Be tracer studies in Chinese loess
中国黄土中10Be示踪剂研究新进展
  • DOI:
    10.1016/j.nimb.2015.02.061
  • 发表时间:
    2015-10
  • 期刊:
  • 影响因子:
    0
  • 作者:
    Weijian Zhou;Xingjun Xie;Warren Beck;Xianghui Kong;Feng Xian;Yajuan Du;Zhenkun Wu
  • 通讯作者:
    Zhenkun Wu

Warren Beck的其他文献

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{{ truncateString('Warren Beck', 18)}}的其他基金

Collaborative Research: Combining Theory and Experiment to Understand the First Photophysical Events in the Photoactivation of the Orange Carotenoid Protein
合作研究:理论与实验相结合,了解橙色类胡萝卜素蛋白光活化中的首次光物理事件
  • 批准号:
    2203577
  • 财政年份:
    2022
  • 资助金额:
    $ 33万
  • 项目类别:
    Standard Grant
Collaborative Research: Combining Theory and Experiment to Understand Carotenoid Photophysics in Photosynthetic Light-Harvesting
合作研究:结合理论和实验来了解光合光捕获中的类胡萝卜素光物理学
  • 批准号:
    1904655
  • 财政年份:
    2019
  • 资助金额:
    $ 33万
  • 项目类别:
    Standard Grant
Collaborative Research: Growth of the Tibetan Plateau and Eastern Asia Climate: Clues to Understanding the Hydrological Cycle
合作研究:青藏高原的增长和东亚气候:了解水文循环的线索
  • 批准号:
    1211397
  • 财政年份:
    2012
  • 资助金额:
    $ 33万
  • 项目类别:
    Standard Grant
Intramolecular Vibrational Excitation of Protein Unfolding and Refolding Dynamics
蛋白质解折叠和重折叠动力学的分子内振动激发
  • 批准号:
    0920101
  • 财政年份:
    2009
  • 资助金额:
    $ 33万
  • 项目类别:
    Standard Grant
Collaborative Research: Growth of the Tibetan Plateau and Eastern Asia Climate: Clues to Understanding the Hydrological Cycle
合作研究:青藏高原的增长和东亚气候:了解水文循环的线索
  • 批准号:
    0908709
  • 财政年份:
    2009
  • 资助金额:
    $ 33万
  • 项目类别:
    Continuing Grant
Quantitative paleorainfall reconstruction from the Chinese Loess Plateau using 10Be and magnetic susceptibility
利用 10Be 和磁化率定量重建中国黄土高原古降雨
  • 批准号:
    0902633
  • 财政年份:
    2009
  • 资助金额:
    $ 33万
  • 项目类别:
    Standard Grant
Resonance Raman Activity From Protein- and Solvent-Derived Modes in Charge-Transfer Proteins
电荷转移蛋白中蛋白质和溶剂衍生模式的共振拉曼活性
  • 批准号:
    0520002
  • 财政年份:
    2005
  • 资助金额:
    $ 33万
  • 项目类别:
    Continuing Grant
Collaborative Research: AMS Ion Source Development at University of California,Irvine, Woods Hole Oceanographic Institute/NOSAMS, University of Arizona, & Nat'l Electrostatics
合作研究:加州大学欧文分校 AMS 离子源开发、伍兹霍尔海洋研究所/NOSAMS、亚利桑那大学、
  • 批准号:
    0326580
  • 财政年份:
    2003
  • 资助金额:
    $ 33万
  • 项目类别:
    Standard Grant
Carbon Cycle Variations during the Last Glacial Period Based on Atmospheric Delta 14C
基于大气Delta 14C的末次冰期碳循环变化
  • 批准号:
    0223311
  • 财政年份:
    2002
  • 资助金额:
    $ 33万
  • 项目类别:
    Standard Grant
Excited-State Reaction Dynamics of Bacteriochlorophyll Dimers
细菌叶绿素二聚体的激发态反应动力学
  • 批准号:
    9996112
  • 财政年份:
    1999
  • 资助金额:
    $ 33万
  • 项目类别:
    Continuing Grant

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长寿命高激发态的实现及其在光化学反应中的应用
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    2019
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凝聚相激发态反应动力学的新型模拟方法的开发
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Excited-State Reaction Dynamics of Bacteriochlorophyll Dimers
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