The deep red state of photosystem II in Cyanidioschyzon merolae

J. Langley, J. Morton, R. Purchase, L. Tian, L. Shen, G. Han, J. R. Shen, E. Krausz

    Research output: Contribution to journalArticlepeer-review

    4 Citations (Scopus)

    Abstract

    We identified and characterised the deep red state (DRS), an optically-absorbing charge transfer state of PSII, which lies at lower energy than P680, in the red algae Cyanidioschyzon merolae by means of low temperature absorption and magnetic circular dichroism spectroscopies. The photoactive DRS has been previously studied in PSII of the higher plant Spinacia oleracea, and in the cyanobacterium Thermosynechococcus vulcanus. We found the DRS in PSII of C. merolae has similar spectral properties. Treatment of PSII with dithionite leads to reduction of cytochrome (cyt) b559 and the PsbV-based cyt c550 as well as the disassembly of the oxygen-evolving complex. Whereas the overall visible absorption spectrum of PSII was little affected, the DRS absorption in the reduced sample was no longer seen. This bleaching of the DRS is discussed in terms of a corresponding lack of a DRS feature in D1D2/cyt b559 reaction centre preparations of PSII.

    Original languageEnglish
    Pages (from-to)275-278
    Number of pages4
    JournalPhotosynthetica
    Volume56
    Issue number1
    DOIs
    Publication statusPublished - Mar 1 2018

    Keywords

    • optical spectra
    • photosynthesis

    ASJC Scopus subject areas

    • Physiology
    • Plant Science

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