来自Physcomitrella patens的PSI-LHCI超复合物的超快动力学
Dongyang Liu1, Qiujing Yan2, Xiaochun Qin3
1Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, 100093 Beijing, China; University of Chinese Academy of Sciences, 100049 Beijing, China; China National Botanical Garden, 100093 Beijing, China; Academician Workstation of Agricultural High-Tech Industrial Area of the Yellow River Delta, National Center of Technology Innovation for Comprehensive Utilization of Saline-Alkali Land, Dongying 257300, China.
这项研究研究了光系统I-光收获复合物I (PSI-LHCI) 在菌Physcomitrella patens中. 我们发现了不同的能量传递动力学和叶绿素特性,为早期陆地植物进化提供了洞察力.
科学领域:
- 光合作用研究研究光合作用.
- 植物进化 植物进化
- 生物物理学的生物物理.
背景情况:
- 光系统I (PSI) 对于植物的光收集和电子传输至关重要.
- 了解像Physcomitrella patens这样的早期陆地植物中的PSI动力学对于进化洞察至关重要.
- 之前的研究在绿藻和更高的植物中描述了PSI,但在中并不广泛.
研究的目的:
- 为了描述纯化Physcomitrella patens PSI-LHCI (Pp PSI-LHCI) 的超快速能量转移和电荷分离动力学.
- 为了比较PPP PSI-LHCI的光谱特性与Arabidopsis thaliana的光谱特性.
- 调查红移 (红色Chls) 在PPPSI-LHCI中的作用及其进化影响.
主要方法:
- 时间分辨率光测量净化PPPSI-LHCI在室温和77K的温度.
- 对能量转移动力学和叶绿素种群的光谱分析.
- 与Arabidopsis thaliana PSI-LHCI的现有数据进行比较分析.
主要成果:
- 在室温下,Pp PSI-LHCI的捕获时间与Arabidopsis thaliana PSI的捕获时间相似 (~46 ps).
- 在Pp PSI-LHCI中,能量转移在720nm以下较慢,但在720nm以上比Arabidopsis.com更快.
- 在77K,Pp PSI-LHCI在702,712和720nm显示红色Chls,缺乏在更高的植物中发现的735nm红色Chls.
结论:
- 动力学和红色Chl组成的差异表明PPPSI-LHCI的适应,可能是由于PSI核心和LHCI带之间的空间差距更大.
- 在中缺少735nm红色Chls表明光采集策略的进化过渡从绿藻到陆地植物.
- 这些发现有助于理解早期陆地植物中的光合作用复合物的演化.
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