Cationic state distribution over the chlorophyll d-containing P(D1)/P(D2) pair in photosystem II.

• Saito, Keisuke

• Shen, Jian-Ren

• 石北, 央

抄録

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)/P(D2) Chl pair in PSII from A. marina, the P(D1)(•+)/P(D2)(•+) 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)/P(D2) pair, i.e., Chld/Chld, Chla/Chld, and Chld/Chla pairs. Chld/Chld and Chla/Chld pairs resulted in a large P(D1)(•+) population relative to P(D2)(•+), as identified in Chla/Chla homodimer pairs in PSII from other species, e.g., Thermosynechococcus elongatus PSII. However, the Chld/Chla pair possessed a P(D1)(•+)/P(D2)(•+) 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 P(D1)/P(D2) in A. marina PSII. This article is part of a Special Issue entitled: Photosynthesis Research for Sustainability: from Natural to Artificial.

収録刊行物

• Biochimica et biophysica acta

  Biochimica et biophysica acta 1817 (8), 1191-1195, 2012-08

  Elsevier B.V.

キーワード

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

詳細情報

• CRID: 1050001335759237888
• NII論文ID: 120005241374
• NII書誌ID: AA00564635
• ISSN: 00063002
• HANDLE: 2433/169710
• 本文言語コード: en
• 資料種別: journal article
• データソース種別:
  • IRDB
  • CiNii Articles