Chloramphenicol mediates superoxide production in photosystem II and enhances its photodamage in isolated membrane particles

Ateeq Ur Rehman, Sandeesha Kodru, Imre Vass

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Chloramphenicol (CAP) is an inhibitor of protein synthesis, which is frequently used to decouple photodamage and protein synthesis dependent repair of Photosystem II during the process of photoinhibition. It has been reported earlier that CAP is able to mediate superoxide production by transferring electrons from the acceptor side of Photosystem I to oxygen. Here we investigated the interaction of CAP with Photosystem II electron transport processes by oxygen uptake and variable chlorophyll fluorescence measurements. Our data show that CAP can accept electrons at the acceptor side of Photosystem II, most likely from Pheophytin, and deliver them to molecular oxygen leading to superoxide production. In addition, the presence of CAP enhances photodamage of Photosystem II electron transport in isolated membrane particles, which effect is reversible by superoxide dismutase. It is concluded that CAP acts as electron acceptor in Photosystem II and mediates its superoxide dependent photodamage. This effect has potential implications for the application of CAP in photoinhibitory studies in intact systems.

Original languageEnglish
Article number479
JournalFrontiers in Plant Science
Volume7
Issue numberAPR2016
DOIs
Publication statusPublished - Apr 8 2016

Keywords

  • Chloramphenicol
  • Photoinhibition
  • Photosystem II
  • Superoxide

ASJC Scopus subject areas

  • Plant Science

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