Cationic state distribution over the chlorophyll d-containing P D1/PD2 pair in photosystem II

Keisuke Saito, Jian Ren Shen, Hiroshi Ishikita

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Most of the chlorophyll (Chl) cofactors in photosystem II (PSII) from Acaryochloris marina are Chld, although a few Chla molecules are also present. To evaluate the possibility that Chla may participate in the P D1/PD2 Chl pair in PSII from A. marina, the P D1•+/PD2•+ charge ratio was investigated using the PSII crystal structure analyzed at 1.9-Å resolution, while considering all possibilities for the Chld-containing P D1/PD2 pair, i.e., Chld/Chld, Chla/Chld, and Chld/Chla pairs. Chld/Chld and Chla/Chld pairs resulted in a large PD1 •+ population relative to PD2•+, as identified in Chla/Chla homodimer pairs in PSII from other species, e.g., Thermosynechococcus elongatus PSII. However, the Chld/Chla pair possessed a PD1•+/PD2•+ ratio of approximately 50/50, which is in contrast to previous spectroscopic studies on A. marina PSII. The present results strongly exclude the possibility that the Chld/Chla pair serves as PD1/PD2 in A. marina PSII. This article is part of a Special Issue entitled: Photosynthesis Research for Sustainability: from Natural to Artificial.

Original languageEnglish
Pages (from-to)1191-1195
Number of pages5
JournalBiochimica et Biophysica Acta - Bioenergetics
Issue number8
Publication statusPublished - Aug 2012


  • Acaryochloris marina
  • Chlorophyll d
  • P680
  • Photosystem II
  • Redox potential
  • Spin density distribution

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Cell Biology


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