Comparison between the Light-Harvesting Mechanisms of Type-I Photosynthetic Reaction Centers of Heliobacteria and Photosystem I: Pigment Site Energy Distribution and Exciton State

2021 ◽  
Author(s):  
Akihiro Kimura ◽  
Hirotaka Kitoh-Nishioka ◽  
Yasuteru Shigeta ◽  
Shigeru Itoh
Keyword(s):  
Energy Distribution ◽  
Photosystem I ◽  
Light Harvesting ◽  
Exciton State ◽  
Reaction Centers ◽  
Type I ◽  
Photosynthetic Reaction Centers ◽  
Site Energy

Fluorescent Quantum Dots as Artificial Antennas for Enhanced Light Harvesting and Energy Transfer to Photosynthetic Reaction Centers

2010 ◽  
Vol 122 (40) ◽  
pp. 7375-7379 ◽  
Author(s):  
Igor Nabiev ◽  
Aliaksandra Rakovich ◽  
Alyona Sukhanova ◽  
Evgeniy Lukashev ◽  
Vadim Zagidullin ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Energy Transfer ◽  
Light Harvesting ◽  
Reaction Centers ◽  
Photosynthetic Reaction Centers

scholarly journals Structure of the far-red light utilizing photosystem I of Acaryochloris marina

2021 ◽  
Author(s):  
Tasuku Hamaguchi ◽  
Keisuke Kawakami ◽  
Kyoko Shinzawa-Itoh ◽  
Natsuko Inoue-Kashino ◽  
Shigeru Itoh ◽  
...  
Keyword(s):  
Reaction Center ◽  
Photosystem I ◽  
Red Light ◽  
Primary Electron ◽  
Photochemical Reactions ◽  
Reaction Centers ◽  
Oxygenic Photosynthesis ◽  
Energy Yield ◽  
Type I ◽  
Acaryochloris Marina

Abstract Acaryochloris marina is one of the cyanobacteria that can use far-red light to drive photochemical reactions for oxygenic photosynthesis. Here, we report the structure of the photosystem I reaction center of A. marina determined by cryo-electron microscopy at 2.5 Å resolution. The structure reveals an arrangement of electron carriers and light-harvesting pigments different from other type I reaction centers. The paired chlorophyll, so-called special pair, of P740 is a dimer of chlorophyll d/d′ and the primary electron acceptor is pheophytin a, a metal-less chlorin different from the chlorophyll a common to all other type I reaction centers. Here we show the architecture of the photosystem I reaction center is composed of 11 subunits and identify key components that help explain how the low energy yield from far-red light is efficiently utilized for driving oxygenic photosynthesis.

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