Impaired psii proteostasis promotes retrograde signaling via salicylic acid1

Jianli Duan, Keun Pyo Lee, Vivek Dogra, Siyuan Zhang, Kaiwei Liu, Carlos Caceres-Moreno, Shanshan Lv, Weiman Xing, Yusuke Kato, Wataru Sakamoto, Renyi Liu, Alberto P. Macho, Chanhong Kim

    Research output: Contribution to journalArticlepeer-review

    13 Citations (Scopus)

    Abstract

    Photodamage of the PSII reaction center (RC) is an inevitable process in an oxygen-rich environment. The damaged PSII RC proteins (Dam-PSII) undergo degradation via the thylakoid membrane-bound FtsH metalloprotease, followed by posttranslational assembly of PSII. While the effect of Dam-PSII on gene regulation is described for cyanobacteria, its role in land plants is largely unknown. In this study, we reveal an intriguing retrograde signaling pathway by using the Arabidopsis (Arabidopsis thaliana) yellow variegated2-9 mutant, which expresses a mutated FtsH2 (FtsH2G267D ) metalloprotease, specifically impairing its substrate-unfolding activity. This lesion leads to the perturbation of PSII protein homeostasis (proteostasis) and the accumulation of Dam-PSII. Subsequently, this results in an up-regulation of salicylic acid (SA)-responsive genes, which is abrogated by inactivation of either an SA transporter in the chloroplast envelope membrane or extraplastidic SA signaling components as well as by removal of SA. These results suggest that the stress hormone SA, which is mainly synthesized via the chloroplast isochorismate pathway in response to the impaired PSII proteostasis, mediates the retrograde signaling. These findings reinforce the emerging view of chloroplast function toward plant stress responses and suggest SA as a potential plastid factor mediating retrograde signaling.

    Original languageEnglish
    Pages (from-to)2182-2197
    Number of pages16
    JournalPlant physiology
    Volume180
    Issue number4
    DOIs
    Publication statusPublished - Aug 2019

    ASJC Scopus subject areas

    • Physiology
    • Genetics
    • Plant Science

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