Photoinhibition of photosystem II under environmental stress

Norio Murata, Shunichi Takahashi, Yoshitaka Nishiyama, Suleyman I. Allakhverdiev

    Research output: Contribution to journalReview articlepeer-review

    941 Citations (Scopus)

    Abstract

    Inhibition of the activity of photosystem II (PSII) under strong light is referred to as photoinhibition. This phenomenon is due to an imbalance between the rate of photodamage to PSII and the rate of the repair of damaged PSII. In the "classical" scheme for the mechanism of photoinhibition, strong light induces the production of reactive oxygen species (ROS), which directly inactivate the photochemical reaction center of PSII. By contrast, in a new scheme, we propose that photodamage is initiated by the direct effect of light on the oxygen-evolving complex and that ROS inhibit the repair of photodamaged PSII by suppressing primarily the synthesis of proteins de novo. The activity of PSII is restricted by a variety of environmental stresses. The effects of environmental stress on damage to and repair of PSII can be examined separately and it appears that environmental stresses, with the exception of strong light, act primarily by inhibiting the repair of PSII. Studies have demonstrated that repair-inhibitory stresses include CO2 limitation, moderate heat, high concentrations of NaCl, and low temperature, each of which suppresses the synthesis of proteins de novo, which is required for the repair of PSII. We postulate that most types of environmental stress inhibit the fixation of CO2 with the resultant generation of ROS, which, in turn, inhibit protein synthesis.

    Original languageEnglish
    Pages (from-to)414-421
    Number of pages8
    JournalBiochimica et Biophysica Acta - Bioenergetics
    Volume1767
    Issue number6
    DOIs
    Publication statusPublished - Jun 2007

    Keywords

    • Environmental stress
    • Photodamage
    • Photoinhibition
    • Photosystem II
    • Protein synthesis
    • Repair

    ASJC Scopus subject areas

    • Biophysics
    • Biochemistry
    • Cell Biology

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