The stress-induced SCP/HLIP family of small light-harvesting-like proteins (ScpABCDE) protects Photosystem II from photoinhibitory damages in the cyanobacterium Synechocystis sp. PCC 6803

Tania Tibiletti, Ateeq Ur Rehman, Imre Vass, Christiane Funk

Research output: Contribution to journalArticle

2 Citations (Scopus)


Small CAB-like proteins (SCPs) are single-helix light-harvesting-like proteins found in all organisms performing oxygenic photosynthesis. We investigated the effect of growth in moderate salt stress on these stress-induced proteins in the cyanobacterium Synechocystis sp. PCC 6803 depleted of Photosystem I (PSI), which expresses SCPs constitutively, and compared these cells with a PSI-less/ScpABCDE mutant. SCPs, by stabilizing chlorophyll-binding proteins and Photosystem II (PSII) assembly, protect PSII from photoinhibitory damages, and in their absence electrons accumulate and will lead to ROS formation. The presence of 0.2 M NaCl in the growth medium increased the respiratory activity and other PSII electron sinks in the PSI-less/ScpABCDE strain. We postulate that this salt-induced effect consumes the excess of PSII-generated electrons, reduces the pressure of the electron transport chain, and thereby prevents 1O2 production.

Original languageEnglish
Pages (from-to)103-114
Number of pages12
JournalPhotosynthesis research
Issue number1-3
Publication statusPublished - Mar 1 2018



  • Photosystem II photoinhibition
  • Salt stress
  • Singlet oxygen
  • Small CAB-like proteins (SCPs)
  • Terminal oxidases

ASJC Scopus subject areas

  • Biochemistry
  • Plant Science
  • Cell Biology

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