A rapid aureochrome opto-switch enables diatom acclimation to dynamic light

Huan Zhang, Xiaofeng Xiong, Kangning Guo, Mengyuan Zheng, Tianjun Cao, Yuqing Yang, Jiaojiao Song, Jie Cen, Jiahuan Zhang, Yanyou Jiang, Shan Feng, Lijin Tian and Xiaobo Li ()
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Huan Zhang: Westlake University
Xiaofeng Xiong: Westlake University
Kangning Guo: Westlake University
Mengyuan Zheng: Chinese Academy of Sciences
Tianjun Cao: Westlake University
Yuqing Yang: Westlake University
Jiaojiao Song: Westlake University
Jie Cen: Westlake University
Jiahuan Zhang: Westlake University
Yanyou Jiang: Westlake University
Shan Feng: Westlake University
Lijin Tian: Chinese Academy of Sciences
Xiaobo Li: Westlake University

Nature Communications, 2024, vol. 15, issue 1, 1-18

Abstract: Abstract Diatoms often outnumber other eukaryotic algae in the oceans, especially in coastal environments characterized by frequent fluctuations in light intensity. The identities and operational mechanisms of regulatory factors governing diatom acclimation to high light stress remain largely elusive. Here, we identified the AUREO1c protein from the coastal diatom Phaeodactylum tricornutum as a crucial regulator of non-photochemical quenching (NPQ), a photoprotective mechanism that dissipates excess energy as heat. AUREO1c detects light stress using a light-oxygen-voltage (LOV) domain and directly activates the expression of target genes, including LI818 genes that encode NPQ effector proteins, via its bZIP DNA-binding domain. In comparison to a kinase-mediated pathway reported in the freshwater green alga Chlamydomonas reinhardtii, the AUREO1c pathway exhibits a faster response and enables accumulation of LI818 transcript and protein levels to comparable degrees between continuous high-light and fluctuating-light treatments. We propose that the AUREO1c-LI818 pathway contributes to the resilience of diatoms under dynamic light conditions.

Date: 2024
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DOI: 10.1038/s41467-024-49991-7

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