Coherent Multidimensional Spectroscopy of the Oxygen Evolving Complex in Photosystem II

光系统 II 中放氧复合物的相干多维光谱

• 批准号: 1410510
• 负责人: John Wright
• 金额: $ 63.91万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-06-15 至 2017-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1410510&HistoricalAwards=false
• 关键词: Coherent; Multidimensional; Spectroscopy; Oxygen; Evolving

The Chemical Measurement and Imaging and the Chemical Structure, Dynamics and Mechanisms Programs of the Chemistry Division have funded Professor John C. Wright of the University of Wisconsin to develop laser spectroscopy methods for measuring complex molecular systems with quantum state resolution. The methods are analogous to the brain's ability to distinguish colors from the response of the three types of retinal cone cells. The laser methods use three different laser beam colors to simultaneously excite three quantum states of specific molecules that proceed to drive photosynthesis. The methods provide the key for discovering how plants make oxygen by resolving the quantum states actually involved in photosynthesis. The primary research goal is applying the new laser methods to understanding the mechanism of oxygen evolution in photosynthesis. Oxygen is created at the oxygen evolution center (OEC) in photosystem II (PS II). The OEC contains Mn, O, and Ca ions and amino acid ligands. The laser beam colors will excite different combinations of vibrational and electronic states of the OEC that distinguish it from the much larger number of molecules in PS II. Different transition metal coordination complexes cobalamin will serve as model systems for testing and developing the methods. The project will resolve the quantum state changes as the OEC progresses through its different oxidation states. The changes will be correlated with those measured by the Biology with X-ray lasers NSF-STC program. The impact of this research is broadened by the participation of under-represented minorities; the development of strategies, materials, and the educational infrastructure required to implement active learning in college classrooms; and the dissemination of the research through different communication channels. The broadest impact is providing a model for how to efficiently collect and use solar energy for our energy future.

化学部的化学测量和成像以及化学结构、动力学和机理项目资助了威斯康星大学的 John C. Wright 教授开发激光光谱方法，用于测量具有量子态分辨率的复杂分子系统。这些方法类似于大脑根据三种视网膜锥细胞的反应来区分颜色的能力。激光方法使用三种不同的激光束颜色同时激发特定分子的三种量子态，从而驱动光合作用。这些方法为发现植物如何通过解析光合作用实际涉及的量子态来制造氧气提供了关键。主要研究目标是应用新的激光方法来了解光合作用中析氧的机制。氧气在光系统 II (PS II) 的析氧中心 (OEC) 产生。 OEC 含有 Mn、O 和 Ca 离子以及氨基酸配体。激光束颜色将激发 OEC 的振动和电子状态的不同组合，从而将其与 PS II 中数量大得多的分子区分开来。不同的过渡金属配位络合物钴胺素将作为测试和开发方法的模型系统。该项目将解决 OEC 经历不同氧化态时量子态的变化。这些变化将与 X 射线激光生物学 NSF-STC 项目测量的变化相关。由于代表性不足的少数群体的参与，这项研究的影响得到了扩大；制定在大学课堂上实施主动学习所需的策略、材料和教育基础设施；以及通过不同的沟通渠道传播研究成果。最广泛的影响是为我们的能源未来如何有效地收集和使用太阳能提供一个模型。

项目成果

Applications of the New Family of Coherent Multidimensional Spectroscopies for Analytical Chemistry

新系列相干多维光谱在分析化学中的应用

• DOI: 10.1146/annurev-anchem-061516-045349
• 发表时间: 2017-06
• 期刊: Annual Review of Analytical Chemistry
• 影响因子: 8
• 作者: Wright; John C.
• 通讯作者: John C.