Elucidating the site of action of oxalate in photosynthetic electron transport chain in spinach thylakoid membranes

Anjana Jajoo, Archna Sahay, Pooja Singh, Sonal Mathur, Sergei K. Zharmukhamedov, Vyacheslav V. Klimov, Suleyman I. Allakhverdiev, Sudhakar Bharti

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The effects of oxalate on PS II and PS I photochemistry were studied. The results suggested that in chloride-deficient thylakoid membranes, oxalate inhibited activity of PS II as well as PS I. To our knowledge, this is the only anion so far known which inhibits both the photosystems. Measurements of fluorescence induction kinetics, Y Z decay, and S2 state multiline EPR signal suggested that oxalate inhibited PS II at the donor side most likely on the oxygen evolving complex. Measurements of re-reduction of P700+ signal in isolated PS I particles in oxalate-treated samples suggested a binding site of oxalate on the donor, as well as the acceptor side of PS I.

Original languageEnglish
Pages (from-to)177-184
Number of pages8
JournalPhotosynthesis research
Volume97
Issue number2
DOIs
Publication statusPublished - Aug 1 2008

Keywords

  • EPR
  • Electron transport chain
  • Fluorescence
  • Oxalate anion
  • Photosystem I
  • Photosystem II

ASJC Scopus subject areas

  • Biochemistry
  • Plant Science
  • Cell Biology

Fingerprint Dive into the research topics of 'Elucidating the site of action of oxalate in photosynthetic electron transport chain in spinach thylakoid membranes'. Together they form a unique fingerprint.

  • Cite this

    Jajoo, A., Sahay, A., Singh, P., Mathur, S., Zharmukhamedov, S. K., Klimov, V. V., Allakhverdiev, S. I., & Bharti, S. (2008). Elucidating the site of action of oxalate in photosynthetic electron transport chain in spinach thylakoid membranes. Photosynthesis research, 97(2), 177-184. https://doi.org/10.1007/s11120-008-9314-1