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Incoherent ultrafast energy transfer in phycocyanin 620 from Thermosynechococcus vulcanus revealed by polarization-controlled two dimensional electronic spectroscopy

文献类型：期刊论文

作者Wang, Jiayu1,5; Zhu, Ruidan1; Zou, Jiading2; Liu, Heyuan1,5; Meng, Hanting1,5; Zhen, Zhanghe1; Li, Wenjun3; Wang, Zhuan1; Chen, Hailong1,2,5; Pu, Yang4
刊名JOURNAL OF CHEMICAL PHYSICS
出版日期2024-08-28
卷号161期号:8页码:12
ISSN号0021-9606
DOI10.1063/5.0222587
通讯作者Pu, Yang(ypu@ldu.edu.cn) ; Weng, Yuxiang(yxweng@iphy.ac.cn)
英文摘要Phycocyanin 620 (PC620) is the outermost light-harvesting complex in phycobilisome of cyanobacteria, engaged in light collection and energy transfer to the core antenna, allophycocyanin. Recently, long-lived exciton-vibrational coherences have been observed in allophycocyanin, accounting for the coherent energy transfer [Zhu et al., Nat. Commun. 15, 3171 (2024)]. PC620 has a nearly identical spatial location of three alpha 84-beta 84 phycocyanobilin pigment pairs to those in allophycocyanin, inferring an existence of possible coherent energy transfer pathways. However, whether PC620 undergoes coherent or incoherent energy transfer remains debated. Furthermore, accurate determination of energy transfer rates in PC620 is still necessary owing to the spectral overlap and broadening in conventional time-resolved spectroscopic measurements. In this work, the energy transfer process within PC620 was directly resolved by polarization-controlled two dimensional electronic spectroscopy (2DES) and global analysis. The results show that the energy transfer from alpha 84 to the adjacent beta 84 has a lifetime constant of 400 fs, from beta 155 to beta 84 of 6-8 ps, and from beta 155 to alpha 84 of 66 ps, fully conforming to the F & ouml;rster resonance energy transfer mechanism. The circular dichroism spectrum also reveals that the alpha 84-beta 84 pigment pair does not form excitonic dimer, and the observed oscillatory signals are confirmed to be vibrational coherence, excluding the exciton-vibrational coupling. Nodal line slope analysis of 2DES further reveals that all the vibrational modes participate in the energy dissipation of the excited states. Our results consolidate that the ultrafast energy transfer process in PC620 is incoherent, where the twisted conformation of alpha 84 is suggested as the main cause for preventing the formation of alpha 84-beta 84 excitonic dimer in contrast to allophycocyanin.
WOS关键词STATE RADIATIONLESS DECAY ; MATRIX SOLVATION DYNAMICS ; RESOLVED RATE CONSTANTS ; LONG-LIVED COHERENCE ; C-PHYCOCYANIN ; QUANTUM COHERENCE ; ALPHA-SUBUNIT ; ALLOPHYCOCYANIN ; RESONANCE ; CHROMOPHORE
WOS研究方向Chemistry ; Physics
语种英语
WOS记录号WOS:001296350100014
资助机构National Natural Science Foundation of Chinahttps://doi.org/10.13039/501100001809 ; National Natural Science Foundation of China ; Natural Science Foundation of Shandong Province
源URL[http://ir.yic.ac.cn/handle/133337/35806]  
专题海岸带生物学与生物资源利用重点实验室
烟台海岸带研究所_海岸带生物学与生物资源利用所重点实验室
通讯作者Pu, Yang; Weng, Yuxiang
作者单位1.Chinese Acad Sci, Lab Soft Matter Phys, Inst Phys, Beijing 100190, Peoples R China
2.Songshan Lake Mat Lab, Dongguan 523808, Guangdong, Peoples R China
3.Chinese Acad Sci, Yantai Inst Coastal Zone Res, Yantai 264003, Peoples R China
4.Ludong Univ, Sch Agr, Yantai 264025, Peoples R China
5.Univ Chinese Acad Sci, Shenyang 100049, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Jiayu,Zhu, Ruidan,Zou, Jiading,et al. Incoherent ultrafast energy transfer in phycocyanin 620 from Thermosynechococcus vulcanus revealed by polarization-controlled two dimensional electronic spectroscopy[J]. JOURNAL OF CHEMICAL PHYSICS,2024,161(8):12.
APA Wang, Jiayu.,Zhu, Ruidan.,Zou, Jiading.,Liu, Heyuan.,Meng, Hanting.,...&Weng, Yuxiang.(2024).Incoherent ultrafast energy transfer in phycocyanin 620 from Thermosynechococcus vulcanus revealed by polarization-controlled two dimensional electronic spectroscopy.JOURNAL OF CHEMICAL PHYSICS,161(8),12.
MLA Wang, Jiayu,et al."Incoherent ultrafast energy transfer in phycocyanin 620 from Thermosynechococcus vulcanus revealed by polarization-controlled two dimensional electronic spectroscopy".JOURNAL OF CHEMICAL PHYSICS 161.8(2024):12.

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来源：烟台海岸带研究所

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