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タイトル: | Cationic State Distribution over the P700 Chlorophyll Pair in Photosystem I. |
著者: | Saito, Keisuke Ishikita, Hiroshi |
著者名の別形: | 石北, 央 |
キーワード: | Photosystem I P700 chlorophyll spin density distribution charge delocalization electron transfer |
発行日: | 19-Oct-2011 |
出版者: | Elsevier Inc. |
誌名: | Biophysical journal |
巻: | 101 |
号: | 8 |
開始ページ: | 2018 |
終了ページ: | 2025 |
抄録: | The primary electron donor P700 in photosystem I is composed of two chlorophylls, P(A) and P(B). P700 forms the cationic [P(A)/P(B)](•+) state as a result of light-induced electron transfer. We obtained a P(A)(•+)/P(B)(•+) ratio of 28:72 and a spin distribution of 22:78 for the entire PSI protein-pigment complex. By considering the influence of the protein components on the redox potential for one-electron oxidation of P(A)/P(B) monomers, we found that the following three factors significantly contributed to a large P(B)(•+) population relative to P(A)(•+): 1), Thr-A743 forming a H-bond with P(A); 2), P(A) as a chlorophyll a epimer; and 3), a conserved PsaA/PsaB pair, the Arg-A750/Ser-B734 residue. In addition, 4), the methyl-ester groups of the accessory chlorophylls A(-1A)/A(-1B) significantly stabilized the cationic [P(A)/P(B)](•+) state and 5), the methyl-ester group orientations were completely different in A(-1A) and A(-1B) as seen in the crystal structure. When the methyl-ester group was rotated, the spin-density distribution over P(A)/P(B) ranged from 22:78 to 15:85. |
著作権等: | © 2011 Biophysical Society. Published by Elsevier Inc. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 This is not the published version. Please cite only the published version. |
URI: | http://hdl.handle.net/2433/150116 |
DOI(出版社版): | 10.1016/j.bpj.2011.09.010 |
PubMed ID: | 22004756 |
出現コレクション: | 学術雑誌掲載論文等 |
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