Influence of the Axial Ligand on the Cationic Properties of the Chlorophyll Pair in Photosystem II from Thermosynechococcus vulcanus.

• Saito, Keisuke

• Shen, Jian-Ren

• 石北, 央

抄録

Influence of the axial ligand of P(D1) chlorophyll (D1-His-198) on the E(m) of monomer chlorophylls P(D1) and P(D2), andthe P(D1)(•+)/P(D2)(•+) charge ratio was investigated by theoretical calculations using the PSII crystal structure of Thermosynechococcus vulcanus analyzed at 1.9-Å resolution. It was found that the E(m)(P(D1))/E(m)(P(D2)) values and P(D1)(•+)/P(D2)(•+) ratio remained unchanged upon D1-H198Q mutation. However, E(m)(P(D1)) was increased in the D1-H198A mutant, resulting in a more even distribution of the positive charge over P(D1)/P(D2). Introduction of a water molecule as an axial ligand resulted in equal E(m) values and P(D1)(•+)/P(D2)(•+) ratios between the mutant and wild-type, thus confirming the presence of the water ligand in the mutant.

収録刊行物

• Biophysical journal

  Biophysical journal 102 (11), 2634-2640, 2012-06-06

  Elsevier Inc.

キーワード

• Photosystem II
• chlorophyll
• spin density distribution
• electron transfer
• redox potential
• P680

詳細情報

• CRID: 1050564285688083968
• NII論文ID: 120004247138
• NII書誌ID: AA00566095
• ISSN: 00063495
• HANDLE: 2433/157230
• 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