LHCII is an antenna of both photosystems after long-term acclimation

E. Wientjes, H. van Amerongen, R. Croce

Research output: Contribution to journalArticleAcademicpeer-review

147 Citations (Scopus)

Abstract

LHCII, the most abundant membrane protein on earth, is the major light-harvesting complex of plants. It is generally accepted that LHCII is associated with Photosystem II and only as a short-term response to overexcitation of PSII a subset moves to Photosystem I, triggered by its phosphorylation (state1 to state2 transition). However, here we show that in most natural light conditions LHCII serves as an antenna of both Photosystem I and Photosystem II and it is quantitatively demonstrated that this is required to achieve excitation balance between the two photosystems. This allows for acclimation to different light intensities simply by regulating the expression of LHCII genes only. It is demonstrated that indeed the amount of LHCII that is bound to both photosystems decreases when growth light intensity increases and vice versa. Finally, time-resolved fluorescence measurements on the photosynthetic thylakoid membranes show that LHCII is even a more efficient light harvester when associated with Photosystem I than with Photosystem II.
Original languageEnglish
Pages (from-to)420-426
JournalBiochimica et Biophysica Acta. B, Bioenergetics
Volume1827
Issue number3
DOIs
Publication statusPublished - 2013

Keywords

  • light-harvesting complex
  • excitation-energy transfer
  • protein-phosphorylation
  • state transitions
  • arabidopsis-thaliana
  • thylakoid membrane
  • supramolecular organization
  • photosynthetic apparatus
  • dependent regulation
  • higher-plants

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