Aggregation of ligh-harvestin complex II leads to formation of efficient excitation energy traps in monomeric and trimeric complexes

B.F. van Oort, A. van Hoek, A.V. Ruban, H. van Amerongen

Research output: Contribution to journalArticleAcademicpeer-review

86 Citations (Scopus)

Abstract

Non-photochemical quenching (NPQ) protects plants against photodamage by converting excess excitation energy into harmless heat. In vitro aggregation of the major light-harvesting complex (LHCII) induces similar quenching, the molecular mechanism of which is frequently considered to be the same. However, a very basic question regarding the aggregation-induced quenching has not been answered yet. Are excitation traps created upon aggregation, or do existing traps start quenching excitations more efficiently in aggregated LHCII where trimers are energetically coupled? Time-resolved fluorescence experiments presented here demonstrate that aggregation creates traps in a significant number of LHCII trimers, which subsequently also quench excitations in connected LHCIIs.
Original languageEnglish
Pages (from-to)3528-3532
Number of pages5
JournalFEBS Letters
Volume581
Issue number18
DOIs
Publication statusPublished - 2007

Keywords

  • time-resolved fluorescence
  • photosystem-ii
  • green plants
  • photoprotection
  • xanthophylls
  • antenna
  • lhcii
  • annihilation
  • zeaxanthin
  • proteins

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