The involvement of photosystem II-generated H2O2 in photoinhibition

Ryan L. Bradley, Krista M. Long, Wayne Frasch

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

The involvement of H2O2 generated by photosystem II (PSII) in the process of photoinhibition of thylakoids with a functional oxygen-evolving complex (OEC) was investigated. The rate of photoinhibition was decreased to the rate of loss of activity in the dark when bovine Fe-catalase was present during the photoinhibitory illumination. Photoinhibition was accelerated for both Cl--depleted and Cl--sufficient thylakoids when KCN was present to inhibit the thylakoid-bound Fe-catalase. We propose that these preparations become photoinhibed by reactions with H2O2 produced via oxidation of water by the Cl--depleted OEC and by reduction of O2 at the QB site when PSII is illuminated without an electron acceptor.

Original languageEnglish (US)
Pages (from-to)209-213
Number of pages5
JournalFEBS Letters
Volume286
Issue number1-2
DOIs
StatePublished - Jul 29 1991

Fingerprint

Thylakoids
Photosystem II Protein Complex
Catalase
Oxygen
Lighting
Oxidation
Electrons
Water

Keywords

  • D1 protein
  • HO
  • Photoinhibition
  • Photosystem II

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Molecular Biology

Cite this

The involvement of photosystem II-generated H2O2 in photoinhibition. / Bradley, Ryan L.; Long, Krista M.; Frasch, Wayne.

In: FEBS Letters, Vol. 286, No. 1-2, 29.07.1991, p. 209-213.

Research output: Contribution to journalArticle

Bradley, Ryan L. ; Long, Krista M. ; Frasch, Wayne. / The involvement of photosystem II-generated H2O2 in photoinhibition. In: FEBS Letters. 1991 ; Vol. 286, No. 1-2. pp. 209-213.
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