Role of sulfoquinovosyl diacylglycerol for the maintenance of photosystem II in Chlamydomonas reinhardtii

Ayumi Minoda, Norihiro Sato, Hisayoshi Nozaki, Katsuhiko Okada, Haruko Takahashi, Kintake Sonoike, Mikio Tsuzuki*

*この研究の対応する著者

研究成果: Article査読

62 被引用数 (Scopus)

抄録

The physiological role of sulfoquinovosyl diacylglycerol (SQDG) in photosynthesis was investigated with a SQDG defective mutant (hf-2) of Chlamydomonas reinhardtii that did not have any detectable amount of SQDG. The mutant showed a lower rate of photosystem II (PSII) activity by ≈ 40% and also a lower growth rate than those of the wild-type. Results of genetical analysis of hf-2 strongly suggest that the SQDG defect and the lowered PSII activity are due to a single gene mutation. The supplementation of SQDG to hf-2 cells restored the lowered PSII activity to the same level as that of wild-type cells, and also enabled the mutant to grow even in the presence of 135 nM 3-(3,4-dichlorophenyl)-1,1-dimethylurea. Moreover, the incubation of isolated thylakoid membranes of hf-2 with SQDG raised the lowered PSII activity. Chemical modifications of SQDG impaired the recovery of PSII activity. The results suggest that SQDG is indispensable for PSII activity in Chlamydomonas by maintaining PSII complexes in their proper state.

本文言語English
ページ(範囲)2353-2358
ページ数6
ジャーナルEuropean Journal of Biochemistry
269
9
DOI
出版ステータスPublished - 2002
外部発表はい

ASJC Scopus subject areas

  • 生化学

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