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Related Experiment Videos

Daddy, where did (PS)I come from?

F Baymann1, M Brugna, U Mühlenhoff

  • 1Laboratoire de Bioénergétique et Ingénierie des Protéines, Institut de Biologie Structurale et Microbiologie, Marseille, France.

Biochimica Et Biophysica Acta
|November 1, 2001
PubMed
Summary
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Photosystem I (RCI) and Photosystem II (RCII) share structural similarities, suggesting RCI is the ancestral photosystem that evolved into PSII through gene duplication and splitting.

Area of Science:

  • Biochemistry
  • Evolutionary Biology
  • Photosynthesis Research

Background:

  • Comparison of reaction center I (RCI)-type photosystems across diverse organisms.
  • Identification of essential properties of an archetypal RCI.

Purpose of the Study:

  • Deduce properties of archetypal RCI.
  • Analyze phylogenetic relationships of photosystems.
  • Propose an evolutionary model for photosystem development.

Main Methods:

  • Comparative analysis of RCI-type photosystems.
  • Phylogenetic analysis of known photosystems.
  • Structural comparison of RCI, RCII, PSI, and PSII.

Main Results:

  • RCI-type photosystems from plants, cyanobacteria, heliobacteria, and green sulfur bacteria exhibit conserved properties.

Related Experiment Videos

  • Predicted phylogenetic branching order: green sulfur bacteria, heliobacteria, cyanobacteria.
  • Structural similarities between RCI and RCII-type photosystems observed.

    • Conclusions:

    • RCI is likely the ancestral photosystem.
    • Photosystem II (PSII) likely evolved from RCI via gene duplication and splitting.
    • An evolutionary model is proposed to explain photosystem diversification.