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Does functional photosystem II complex have an oxygen channel?

J M Anderson1

  • 1Photobioenergetics, Research School of Biological Sciences, Australian National University, G.P.O. Box 475, 2601, Canberra, A.C.T., Australia. anderson@rsbs.anu.edu.au

FEBS Letters
|February 13, 2001
PubMed
Summary

Photosystem II (PSII) likely possesses an oxygen channel to safely release O(2) away from reactive components. This prevents damaging singlet oxygen formation in functional PSII complexes.

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Area of Science:

  • Photosynthesis research
  • Bioenergetics
  • Plant biochemistry

Background:

  • Photosystem II (PSII) in thylakoid membranes splits water to produce oxygen using light energy.
  • Cytochrome c oxidase catalyzes the reverse reaction, featuring proton, water, and proposed oxygen channels.
  • Understanding PSII's water-splitting mechanism is crucial for photosynthesis research.

Purpose of the Study:

  • To propose the existence and function of a specific oxygen channel in functional Photosystem II.
  • To elucidate the role of this proposed channel in preventing singlet oxygen generation.
  • To compare PSII's water oxidation process with cytochrome c oxidase.

Main Methods:

  • Comparative analysis of PSII and cytochrome c oxidase structures and functions.

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  • Hypothetical modeling of oxygen transport within PSII.
  • Review of existing literature on PSII mechanisms and oxygen toxicity.

    • Main Results:

    • A specific oxygen channel is proposed for functional PSII complexes.
    • This channel would direct O(2) away from the reactive P680(+)Pheo(-) radical pair.
    • The channel prevents singlet oxygen generation in functional PSII, unlike in damaged complexes.

    Conclusions:

    • Functional PSII likely requires an oxygen channel for safe O(2) release.
    • This channel is essential for preventing damaging side reactions and maintaining photosynthetic efficiency.
    • Singlet oxygen plays a significant role in non-functional, structurally perturbed PSII.