Energy transfer from phycobilisomes to photosystem I at room temperature

被引：4
|
作者：
Biswas, Avratanu [1 ,2 ,3 ,4 ]
Akhtar, Parveen [3 ]
Lambrev, Petar H. [3 ]
van Stokkum, Ivo H. M. [1 ,2 ]
机构：
[1] Vrije Univ Amsterdam, Dept Phys & Astron, Fac Sci, Amsterdam, Netherlands
[2] Vrije Univ Amsterdam, Fac Sci, LaserLaB, Amsterdam, Netherlands
[3] HUN REN Biol Res Ctr, Inst Plant Biol, Szeged, Hungary
[4] Univ Szeged, Doctoral Sch Biol, Szeged, Hungary
来源：
FRONTIERS IN PLANT SCIENCE | 2024年 / 14卷
关键词：
photosystem I (PSI); global analysis (GA); target analysis; phycobilisomes (PBs); energy transfer (ET); EXCITATION-ENERGY; MUTANT; APCD; CYANOBACTERIA; CHLOROPHYLL; ASSOCIATION; PHYCOCYANIN; COMPONENTS; KINETICS; MODEL;
D O I：
10.3389/fpls.2023.1300532
中图分类号：
Q94 [植物学];
学科分类号：
071001 ;
摘要：
The phycobilisomes function as the primary light-harvesting antennae in cyanobacteria and red algae, effectively harvesting and transferring excitation energy to both photosystems. Here we investigate the direct energy transfer route from the phycobilisomes to photosystem I at room temperature in a mutant of the cyanobacterium Synechocystis sp. PCC 6803 that lacks photosystem II. The excitation dynamics are studied by picosecond time-resolved fluorescence measurements in combination with global and target analysis. Global analysis revealed several fast equilibration time scales and a decay of the equilibrated system with a time constant of approximate to 220 ps. From simultaneous target analysis of measurements with two different excitations of 400 nm (chlorophyll a) and 580 nm (phycobilisomes) a transfer rate of 42 ns-1 from the terminal emitter of the phycobilisome to photosystem I was estimated.
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页数：10
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