Structure, function and regulation of plant photosystem I

Poul Erik Jensen*, Roberto Bassi, Egbert J. Boekema, Jan P. Dekker, Stefan Jansson, Dario Leister, Colin Robinson, Henrik Vibe Scheller

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review

155 Citations (Scopus)
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Abstract

Photosystem I (PSI) is a multisubunit protein complex located in the thylakoid membranes of green plants and algae, where it initiates one of the first steps of solar energy conversion by light-driven electron transport. In this review, we discuss recent progress on several topics related to the functioning of the PSI complex, like the protein composition of the complex in the plant Arabidopsis thaliana, the function of these subunits and the mechanism by which nuclear-encoded subunits can be inserted into or transported through the thylakoid membrane. Furthermore, the structure of the native PSI complex in several oxygenic photosynthetic organisms and the role of the chlorophylls and carotenoids in the antenna complexes in light harvesting and photoprotection are reviewed. The special role of the 'red' chlorophylls (chlorophyll molecules that absorb at longer wavelength than the primary electron donor P700) is assessed. The physiology and mechanism of the association of the major light-harvesting complex of photosystem II (LHCII) with PSI during short term adaptation to changes in light quality and quantity is discussed in functional and structural terms. The mechanism of excitation energy transfer between the chlorophylls and the mechanism of primary charge separation is outlined and discussed. Finally, a number of regulatory processes like acclimatory responses and retrograde signalling is reviewed with respect to function of the thylakoid membrane. We finish this review by shortly discussing the perspectives for future research on PSI. (c) 2007 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)335-352
Number of pages18
JournalBiochimica et Biophysica Acta
Volume1767
Issue number5
DOIs
Publication statusPublished - May-2007

Keywords

  • excitation energy transfer
  • light harvesting
  • photosynthesis
  • red chlorophylls
  • regulation
  • state transitions
  • LIGHT-HARVESTING-COMPLEX
  • SIGNAL RECOGNITION PARTICLE
  • CHLOROPHYLL-BINDING PROTEIN
  • ALGA CHLAMYDOMONAS-REINHARDTII
  • PHOTOSYNTHETIC STATE TRANSITIONS
  • ULTRAFAST TRANSIENT ABSORPTION
  • PIGMENT-PIGMENT INTERACTIONS
  • THYLAKOID MEMBRANE-PROTEINS
  • EFFICIENT ELECTRON-TRANSFER
  • MESSENGER-RNA ACCUMULATION

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