Flexibility in photosynthetic electron transport

A newly identified chloroplast oxidase involved in chlororespiration

L. Cournac, E. M. Josse, T. Joet, D. Rumeau, Kevin Edward Redding, M. Kuntz, G. Peltier, J. Barber, K. Niyogi, C. H. Foyer, A. Laisk, H. C P Matthijs

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

Besides electron transfer reactions involved in the 'Z' scheme of photosynthesis, alternative electron transfer pathways have been characterized in chloroplasts. These include cyclic electron flow around photosystem I (PS I) or a respiratory chain called chlororespiration. Recent work has supplied new information concerning the molecular nature of the electron carriers involved in the non-photochemical reduction of the plastoquinone (PQ) pool. However, until now little is known concerning the nature of the electron carriers involved in PQ oxidation. By using mass spectrometric measurement of oxygen exchange performed in the presence of 18O-enriched O2 and Chlamydomonas mutants deficient in PS I, we show that electrons can be directed to a quinol oxidase sensitive to propyl gallate but insensitive to salicyl hydroxamic acid. This oxidase has immunological and pharmacological similarities with a plastid protein involved in carotenoid biosynthesis.

Original languageEnglish
Pages (from-to)1447-1454
Number of pages8
JournalPhilosophical Transactions of the Royal Society B: Biological Sciences
Volume355
Issue number1402
Publication statusPublished - Oct 29 2000

Fingerprint

Chloroplasts
Electron Transport
electron transfer
Oxidoreductases
chloroplasts
electrons
Electrons
photosystem I
Plastoquinone
Photosystem I Protein Complex
hydroxamic acids
propyl gallate
Chlamydomonas
electron transport chain
Propyl Gallate
Chloroplast Proteins
Hydroxamic Acids
plastids
carotenoids
Photosynthesis

Keywords

  • Chlamydomonas
  • Chloroplast
  • Chlororespiration
  • Oxygen
  • Quinol oxidase

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Agricultural and Biological Sciences (miscellaneous)

Cite this

Flexibility in photosynthetic electron transport : A newly identified chloroplast oxidase involved in chlororespiration. / Cournac, L.; Josse, E. M.; Joet, T.; Rumeau, D.; Redding, Kevin Edward; Kuntz, M.; Peltier, G.; Barber, J.; Niyogi, K.; Foyer, C. H.; Laisk, A.; Matthijs, H. C P.

In: Philosophical Transactions of the Royal Society B: Biological Sciences, Vol. 355, No. 1402, 29.10.2000, p. 1447-1454.

Research output: Contribution to journalArticle

Cournac, L, Josse, EM, Joet, T, Rumeau, D, Redding, KE, Kuntz, M, Peltier, G, Barber, J, Niyogi, K, Foyer, CH, Laisk, A & Matthijs, HCP 2000, 'Flexibility in photosynthetic electron transport: A newly identified chloroplast oxidase involved in chlororespiration', Philosophical Transactions of the Royal Society B: Biological Sciences, vol. 355, no. 1402, pp. 1447-1454.
Cournac, L. ; Josse, E. M. ; Joet, T. ; Rumeau, D. ; Redding, Kevin Edward ; Kuntz, M. ; Peltier, G. ; Barber, J. ; Niyogi, K. ; Foyer, C. H. ; Laisk, A. ; Matthijs, H. C P. / Flexibility in photosynthetic electron transport : A newly identified chloroplast oxidase involved in chlororespiration. In: Philosophical Transactions of the Royal Society B: Biological Sciences. 2000 ; Vol. 355, No. 1402. pp. 1447-1454.
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