| Item type |
学術雑誌論文 / Journal Article(1) |
| 公開日 |
2013-08-09 |
| タイトル |
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タイトル |
Two-step mechanism of photodamage to photosystem II: Step 1 occurs at the oxygen-evolving complex and step 2 occurs at the photochemical reaction center |
| タイトル |
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タイトル |
Two-step mechanism of photodamage to photosystem II: Step 1 occurs at the oxygen-evolving complex and step 2 occurs at the photochemical reaction center |
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言語 |
en |
| 言語 |
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言語 |
eng |
| 資源タイプ |
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資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
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資源タイプ |
journal article |
| アクセス権 |
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アクセス権 |
metadata only access |
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アクセス権URI |
http://purl.org/coar/access_right/c_14cb |
| 著者 |
OHNISHI, Norikazu
ALLAKHVERDIEV, Suleyman I
TAKAHASHI, Shunichi
HIGASHI, Shoichi
WATANABE, Masakatsu
NISHIYAMA, Yoshitaka
MURATA, Norio
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| 著者別名 |
渡辺, 正勝
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| 抄録 |
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内容記述タイプ |
Abstract |
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内容記述 |
Under strong light, photosystem II (PSII) of oxygenic photosynthetic organisms is inactivated, and this phenomenon is called photoinhibition. In a widely accepted model, photoinhibition is induced by excess light energy, which is absorbed by chlorophyll but not utilized in photosynthesis. Using monochromatic light from the Okazaki Large Spectrograph and thylakoid membranes from Thermosynechococcus elongatus, we observed that UV and blue light inactivated the oxygen-evolving complex much faster than the photochemical reaction center of PSII. These observations suggested that the light-induced damage was associated with a UV- and blue light-absorbing center in the oxygen-evolving complex of PSII. The action spectrum of the primary event in photodamage to PSII revealed the strong effects of UV and blue light and differed considerably from the absorption spectra of chlorophyll and thylakoid membranes. By contrast to the photoinduced inactivation of the oxygen-evolving complex in untreated thylakoid membranes, red light efficiently induced inactivation of the PSII reaction center in Tris-treated thylakoid membranes, and the action spectrum resembled the absorption spectrum of chlorophyll. Our observations suggest that photodamage to PSII occurs in two steps. Step 1 is the light-induced inactivation of the oxygen-evolving complex. Step 2, occurring after step 1 is complete, is the inactivation of the PSII reaction center by light absorbed by chlorophyll. We confirmed our model by illumination of untreated thylakoid membranes with blue and UV light, which inactivated the oxygen-evolving complex, and then with red light, which inactivated the photochemical reaction center. |
| 書誌情報 |
Biochemistry
en : Biochemistry
巻 44,
号 23,
p. 8494-8499,
発行日 2005-06-14
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| 出版者 |
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出版者 |
ACS Publications |
| ISSN |
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収録物識別子タイプ |
ISSN |
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収録物識別子 |
00062960 |
| PubMed番号 |
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識別子タイプ |
PMID |
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関連識別子 |
15938639 |
| DOI |
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識別子タイプ |
DOI |
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関連識別子 |
http://doi.org/10.1021/bi047518q |
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関連名称 |
10.1021/bi047518q |
| 権利 |
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権利情報 |
© 2005 American Chemical Society |
