Photosystem I articles within Nature Communications

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    | Open Access

    Dinoflagellates are ecologically important and essential to corals and other cnidarians as phytosymbionts, but their photosystems had been underexplored. Recently, photosystem I (PSI) of dinoflagellate Symbiodinium sp. was structurally characterized using cryo-Electron Microscopy (cryo-EM). These analyses revealed a distinct organization of the PSI supercomplex, including two previously unidentified subunits, PsaT and PsaU, and shed light on interactions between light harvesting antenna proteins and the PSI core. These results have implications with respect to the evolution of dinoflagellates and their association with cnidarians.

    • Senjie Lin
    • , Shuaishuai Wu
    •  & Arthur R. Grossman

  • Article
    | Open Access

    NADP+ is the final electron acceptor for linear electron transfer in photosynthesis. Here, the authors show that the NADP pool size is modulated by its interconversion with NAD via ΔpH regulation in response to varying light conditions.

    • Yusuke Fukuda
    • , Chinami Ishiyama
    •  & Shin-nosuke Hashida

  • Article
    | Open Access

    Generally, net O2 consumption becomes dominant when photosynthesis is suppressed at night in green organisms. Here, Bag et al. show that Scots pine and Norway spruce needles display strong O2 consumption when extremely low temperatures coincide with high solar irradiation during early spring.

    • Pushan Bag
    • , Tatyana Shutova
    •  & Stefan Jansson

  • Article
    | Open Access

    During photosynthesis, light energy is harvested by an antenna systems and delivered to the reaction centers (RCs) for charge separation and electron transfer (ET). The authors report cryo-EM structures of two forms of RC from the microaerophilic Chloracidobacterium thermophilum (CabRC), providing a structural basis for ET within the CabRC.

    • Shishang Dong
    • , Guoqiang Huang
    •  & Xiaochun Qin

  • Article
    | Open Access

    It is currently thought that the thylakoid proteins PGRL1 and PGR5 form a complex to mediate cyclic electron flow (CEF) around photosystem I. Here the authors show that CEF can in fact be mediated by PGR5 alone and that PGRL1 and the homologous PGRL2 modify the process by modulating PGR5 activity and stability.

    • Thilo Rühle
    • , Marcel Dann
    •  & Dario Leister

  • Article
    | Open Access

    Acaryochloris marina photosystem I (PSI) contains chlorophyll d and absorbs light in the far-red region of the spectrum. The structure of A. marina PSI reaction center reveals several unusual features, including pheophytin as the primary electron acceptor.

    • Tasuku Hamaguchi
    • , Keisuke Kawakami
    •  & Yasuhiro Kashino

  • Article
    | Open Access

    Photosystems (PS) I and II undergo state transitions to optimize photosynthesis and photoprotection. Here the authors report a cryo-electron microscopy structure of the state 2 PSI-LHCI-LHCII supercomplex from C. reinhardtii revealing subunit organization and possible pathways of energy transfer.

    • Zihui Huang
    • , Liangliang Shen
    •  & Guangye Han

  • Article
    | Open Access

    LHCR proteins are ancient chlorophyll a-binding antennas that evolved in diverse algae of the red lineage. Here Lu et al. characterize a red lineage LHCR mutant and show reduced oxidative damage in high light but attenuated growth under low light, thus demonstrating how LHCR proteins impact the balance between photoprotection and light harvesting.

    • Yandu Lu
    • , Qinhua Gan
    •  & Krishna K. Niyogi

  • Article
    | Open Access

    Cyanobacterial photosystem I has a highly conserved core antenna consisting of eleven subunits and more than 90 chlorophylls. Here via CryoEM and spectroscopy, the authors determine the location of a red-shifted low-energy chlorophyll that allows harvesting of longer wavelengths of light.

    • Hila Toporik
    • , Anton Khmelnitskiy
    •  & Yuval Mazor

  • Article
    | Open Access

    Diatoms are marine algae with an important role in global photosynthetic carbon fixation. Here, the authors present the 2.38 Å cryo-EM structure of photosystem I (PSI) in complex with its 24 fucoxanthin chlorophyll a/c-binding (FCPI) antenna proteins from the diatom Chaetoceros gracilis, which provides mechanistic insights into light-energy harvesting, transfer and quenching of the PSI-FCPI supercomplex.

    • Caizhe Xu
    • , Xiong Pi
    •  & Jian-Ren Shen

  • Article
    | Open Access

    Chlorophyll f (Chl f) is the most red-shifted Chl in oxygenic photosynthesis but its localization in photosystem I (PSI) has been unknown so far. Here the authors determine the cryo-EM structures of PSI complexes from a Chl f-containing cyanobacterium grown either under white light or far-red light conditions and identify seven Chls f in the far-red light PSI structure, whereas PSI from cells grown under white light contains only Chl a.

    • Koji Kato
    • , Toshiyuki Shinoda
    •  & Tatsuya Tomo

  • Article
    | Open Access

    Photosystem I is a large multiprotein complex embedded in the chloroplast thylakoid membrane. Here the authors provide evidence for a modular assembly process, whereby Ycf3 facilitates assembly of the reaction center, while Ycf4 incorporates peripheral core and light harvesting complex subunits to the reaction center.

    • Sreedhar Nellaepalli
    • , Shin-Ichiro Ozawa
    •  & Yuichiro Takahashi

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