Structure and function of photosystem I in Cyanidioschyzon merolae

  • Maya Antoshvili
  • Ido Caspy
  • Michael Hippler
  • Nathan Nelson
Original Article
  • 147 Downloads

Abstract

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.

Keywords

Photosynthesis Photosystem I Crystal structure Synechocystis Cyanobacteria Membrane complexes 

Abbreviations

PSI

Photosystem I

PSII

Photosystem II

LHC

Light-harvesting complex

Notes

Acknowledgements

The authors would like to thank the ESRF, SLS, and BESSYII synchrotrons for beam time and the staff scientists for excellent guidance and assistance. This work was supported by a grant (No. 293579 – HOPSEP) from the European Research Council, by The Israel Science Foundation (Grant No. 569/17), and by the I-CORE Program of the Planning and Budgeting Committee and The Israel Science Foundation (Grant No. 1775/12). M.H acknowledges funding by the German Science Foundation (DFG HI 739/13.1).

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Copyright information

© Springer Science+Business Media B.V., part of Springer Nature 2018

Authors and Affiliations

  • Maya Antoshvili
    • 1
  • Ido Caspy
    • 1
  • Michael Hippler
    • 2
  • Nathan Nelson
    • 1
  1. 1.Department of Biochemistry and Molecular Biology, The George S. Wise Faculty of Life SciencesTel Aviv UniversityTel AvivIsrael
  2. 2.Institute of Plant Biology and BiotechnologyUniversity of MünsterMünsterGermany

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