Role of an ancient light-harvesting protein of PSI in light absorption and photoprotection

Yandu Lu (), Qinhua Gan, Masakazu Iwai, Alessandro Alboresi, Adrien Burlacot, Oliver Dautermann, Hiroko Takahashi, Thien Crisanto, Gilles Peltier, Tomas Morosinotto, Anastasios Melis and Krishna K. Niyogi ()
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Yandu Lu: Hainan University
Qinhua Gan: Hainan University
Masakazu Iwai: University of California
Alessandro Alboresi: Universita‘ di Padova
Adrien Burlacot: UMR 7265, Laboratoire de Bioénergétique et Biotechnologie des Bactéries et Microalgues, CEA Cadarache
Oliver Dautermann: University of California
Hiroko Takahashi: Saitama University
Thien Crisanto: University of California
Gilles Peltier: UMR 7265, Laboratoire de Bioénergétique et Biotechnologie des Bactéries et Microalgues, CEA Cadarache
Tomas Morosinotto: Universita‘ di Padova
Anastasios Melis: University of California
Krishna K. Niyogi: University of California

Nature Communications, 2021, vol. 12, issue 1, 1-10

Abstract: Abstract Diverse algae of the red lineage possess chlorophyll a-binding proteins termed LHCR, comprising the PSI light-harvesting system, which represent an ancient antenna form that evolved in red algae and was acquired through secondary endosymbiosis. However, the function and regulation of LHCR complexes remain obscure. Here we describe isolation of a Nannochloropsis oceanica LHCR mutant, named hlr1, which exhibits a greater tolerance to high-light (HL) stress compared to the wild type. We show that increased tolerance to HL of the mutant can be attributed to alterations in PSI, making it less prone to ROS production, thereby limiting oxidative damage and favoring growth in HL. HLR1 deficiency attenuates PSI light-harvesting capacity and growth of the mutant under light-limiting conditions. We conclude that HLR1, a member of a conserved and broadly distributed clade of LHCR proteins, plays a pivotal role in a dynamic balancing act between photoprotection and efficient light harvesting for photosynthesis.

Date: 2021
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DOI: 10.1038/s41467-021-20967-1

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