Light-induced psbA translation in plants is triggered by photosystem II damage via an assembly-linked autoregulatory circuit | Zendy

Prakitchai Chotewutmontri | Zendy; Alice Barkan | Zendy

Open Access

Light-induced psbA translation in plants is triggered by photosystem II damage via an assembly-linked autoregulatory circuit

Author(s) -

Prakitchai Chotewutmontri,

Alice Barkan

Publication year - 2020

Publication title -

proceedings of the national academy of sciences

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 5.011

H-Index - 771

eISSN - 1091-6490

pISSN - 0027-8424

DOI - 10.1073/pnas.2007833117

Subject(s) - photosystem ii , biogenesis , photosynthesis , photosynthetic reaction centre , translation (biology) , biophysics , microbiology and biotechnology , mechanism (biology) , biology , chemistry , biochemistry , physics , gene , messenger rna , quantum mechanics

Significance Photosystem II (PSII) harbors the water-splitting activity underlying oxygenic photosynthesis. The PSII reaction center protein D1 is subject to photodamage and must be replaced with nascent D1 to maintain photosynthetic activity. How new D1 synthesis is coordinated with D1 damage has been a long-standing question. Our results clarify the nature of the light-induced signal that activates D1 synthesis for PSII repair in plants, and suggest an autoregulatory mechanism in which degradation of damaged D1 relieves a repressive interaction between D1 and translational activators in a complex that functions in PSII assembly and repair. This proposed mechanism comprises a responsive switch that couples D1 synthesis to need for D1 during PSII biogenesis and repair.

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