Structure and function of photosystem I in Cyanidioschyzon merolae

Maya Antoshvili, Ido Caspy, Michael Hippler, Nathan Nelson*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

56 Scopus citations


The evolution of photosynthesis from primitive photosynthetic bacteria to higher plants has been driven by the need to adapt to a wide range of environmental conditions. The red alga Cyanidioschyzon merolae is a primitive organism, which is capable of performing photosynthesis in extreme acidic and hot environments. The study of its photosynthetic machinery may provide new insight on the evolutionary path of photosynthesis and on light harvesting and its regulation in eukaryotes. With that aim, the structural and functional properties of the PSI complex were investigated by biochemical characterization, mass spectrometry, and X-ray crystallography. PSI was purified from cells grown at 25 and 42 °C, crystallized and its crystal structure was solved at 4 Å resolution. The structure of C. merolae reveals a core complex with a crescent-shaped structure, formed by antenna proteins. In addition, the structural model shows the position of PsaO and PsaM. PsaG and PsaH are present in plant complex and are missing from the C. merolae model as expected. This paper sheds new light onto the evolution of photosynthesis, which gives a strong indication for the chimerical properties of red algae PSI. The subunit composition of the PSI core from C. merolae and its associated light-harvesting antennae suggests that it is an evolutionary and functional intermediate between cyanobacteria and plants.

Original languageEnglish
Pages (from-to)499-508
Number of pages10
JournalPhotosynthesis Research
Issue number1-3
StatePublished - 1 Mar 2019


FundersFunder number
German Science Foundation
European Research Council
Deutsche ForschungsgemeinschaftHI 739/13.1
European Synchrotron Radiation Facility293579
Israel Science Foundation569/17
Planning and Budgeting Committee of the Council for Higher Education of Israel1775/12


    • Crystal structure
    • Cyanobacteria
    • Membrane complexes
    • Photosynthesis
    • Photosystem I
    • Synechocystis


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