scholarly journals Singlet Energy Dissipation in the Photosystem II Light-Harvesting Complex Does Not Involve Energy Transfer to Carotenoids

ChemPhysChem ◽  
2010 ◽  
Vol 11 (6) ◽  
pp. 1289-1296 ◽  
Author(s):  
Marc G. Müller ◽  
Petar Lambrev ◽  
Michael Reus ◽  
Emilie Wientjes ◽  
Roberta Croce ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Energy Dissipation ◽  
Photosystem Ii ◽  
Light Harvesting ◽  
Light Harvesting Complex

scholarly journals Uphill energy transfer mechanism for photosynthesis in the Antarctic alga

2021 ◽  
Author(s):  
Makiko Kosugi ◽  
Masato Kawasaki ◽  
Yutaka Shibata ◽  
Kojiro Hara ◽  
Shinichi Takaichi ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Photosystem Ii ◽  
Excitation Energy ◽  
High Efficiency ◽  
Light Harvesting ◽  
Red Light ◽  
Excitation Energy Transfer ◽  
Energy Transfer Mechanism ◽  
Light Harvesting Complex ◽  
Prasiola Crispa

Abstract Prasiola crispa, a major green alga in Antarctica, forms layered colonies for survival under the severe terrestrial conditions of Antarctica, which include severe cold, drought, and strong sunlight. As a result of these conditions, the surface cells of P. crispa and other Antarctic organisms face high risk of photodamage. Cells of deeper layer escape from photodamage at the sacrifice of photosynthetic active radiation except infrared. P. crispa achieves effective photosynthesis by low energy far-red light for photosystem II excitation with high efficiency similar to that of visible light. Here, we identified a far-red light-harvesting complex of photosystem II in P. crispa, Pc-frLHC, and proposed a molecular mechanism of uphill excitation energy transfer based on its cryogenic electron-microscopy structure. While Pc-frLHC is associated with photosystem II, it is evolutionarily related to the light-harvesting complex of photosystem I. Pc-frLHC forms a ring-shaped homo-undecamer in which all chlorophyll a molecules are energetically connected and contains chlorophyll a trimers. It seems that the trimers are long-wavelength-absorbing chlorophylls for far-red light at 708 nm, and further absorbance extension is accomplished by Davydov-splitting in dimeric chlorophylls. The chlorophyll network should enable a highly efficient entropy-driven uphill excitation energy transfer using far-red light up to 725 nm.

B800–B850 coherence correlates with energy transfer rates in the LH2 complex of photosynthetic purple bacteria

2015 ◽  
Vol 17 (46) ◽  
pp. 30805-30816 ◽  
Author(s):  
Cathal Smyth ◽  
Daniel G. Oblinsky ◽  
Gregory D. Scholes
Keyword(s):  
Energy Transfer ◽  
Quantum Information ◽  
Information Science ◽  
Light Harvesting ◽  
Purple Bacteria ◽  
Quantum Information Science ◽  
Light Harvesting Complex ◽  
Transfer Rates ◽  
Photosynthetic Purple Bacteria

Delocalization of a model light-harvesting complex is investigated using multipartite measures inspired by quantum information science.

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