Cellular energization protects the photosynthetic machinery against salt-induced inactivation in Synechococcus

Suleyman I. Allakhverdiev, Vyacheslav V. Klimov, Martin Hagemann

    Research output: Contribution to journalArticlepeer-review

    12 Citations (Scopus)

    Abstract

    The effects of the energization of cells by light and by exogenous glucose on the salt-induced inactivation of the photosynthetic machinery were investigated in the cyanobacterium Synechococcus sp. PCC 7942. The incubation of the cyanobacterial cells in a medium supplemented with 0.5 M NaCl induced a rapid decline with a subsequent slow decline, in the oxygen-evolving activity of Photosystem (PS) II and in the electron-transport activity of PSI. Light and exogenous glucose each protected PSII and PSI against the second phase of the NaCl-induced inactivation. The protective effects of light and glucose were eliminated by an uncoupler of phosphorylation and by lincomycin, an inhibitor of protein synthesis. Light and glucose had similar effects on the NaCl-induced inactivation of Na+/H+ antiporters. After photosynthetic and Na+/H+-antiport activities had been eliminated by the exposure of cells to 0.5 M NaCl in the darkness, both activities were partially restored by light or exogenous glucose. This recovery was prevented by lincomycin. These observations suggest that cellular energization by either photosynthesis or respiration, which is necessary for protein synthesis, is important for the recovery of the photosynthetic machinery and Na +/H+ antiporters from inactivation by a high level of NaCl.

    Original languageEnglish
    Pages (from-to)201-208
    Number of pages8
    JournalBiochimica et Biophysica Acta - Bioenergetics
    Volume1708
    Issue number2
    DOIs
    Publication statusPublished - Jun 30 2005

    Keywords

    • Cellular energization
    • Na /H-antiporter
    • Photosynthesis
    • Respiration
    • Salt stress
    • Synechococcus

    ASJC Scopus subject areas

    • Biophysics
    • Biochemistry
    • Cell Biology

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