2006年7月
Anisotropy of the S-2-state manganese cluster in single crystals of cyanobacterial photosystem II studied by W-band electron paramagnetic resonance spectroscopy
JOURNAL OF PHYSICAL CHEMISTRY B
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- 巻
- 110
- 号
- 26
- 開始ページ
- 13242
- 終了ページ
- 13247
- 記述言語
- 英語
- 掲載種別
- DOI
- 10.1021/jp055008f
- 出版者・発行元
- AMER CHEMICAL SOC
The multiline signal from the S-2-state manganese cluster in the oxygen evolving complex of photosystem II (PSII) was observed in single crystals of a thermophilic cyanobacterium Thermosynechococcus Vulcanus for the first time by W-band (94 GHz) electron paramagnetic resonance (EPR). At W- band, spectra were characterized by the g-anisotropy, which enabled the precise determination of the tensor. Distinct hyperfine splittings (hfs's) as seen in frozen solutions of PSII at X-band (9.5 GHz) were detected in most of the crystal orientations relative to the magnetic field. In some orientations, however, the hfs's disappeared due to overlapping of a large number of EPR lines from eight crystallographic symmetry-related sites of the manganese cluster within the unit cell of the crystal. Analysis of the orientation-dependent spectral features yielded the following g-tensor components: g(x) = 1.988, g(y) = 1.981, g(z) = 1.965. The principal values suggested an approximate axial symmetry around the Mn(III) ion in the cluster.
- リンク情報
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- DOI
- https://doi.org/10.1021/jp055008f
- CiNii Articles
- http://ci.nii.ac.jp/naid/80019008817
- PubMed
- https://www.ncbi.nlm.nih.gov/pubmed/16805638
- Web of Science
- https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000238645700062&DestApp=WOS_CPL
- ID情報
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- DOI : 10.1021/jp055008f
- ISSN : 1520-6106
- CiNii Articles ID : 80019008817
- PubMed ID : 16805638
- Web of Science ID : WOS:000238645700062