Involvement of sulfoquinovosyl diacylglycerol in the structural integrity and heat-tolerance of photosystem II

Norihiro Sato, Motohide Aoki, Yukihiro Maru, Kintake Sonoike, Ayumi Minoda, Mikio Tsuzuki

研究成果: Article

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To examine the role of sulfoquinovosyl diacylglycerol (SQDG) in thylakoid membranes, we compared the structural and functional properties of photosystem II (PSII) between a mutant of Chlamydomonas reinhardtii defective in SQDG (hf-2) and the wild type. The PSII core complex of hf-2, as compared with that of the wild type, showed structural fragility when solubilized with a detergent, dodecyl β-D-maltoside, suggesting that the physical properties of the PSII complex were altered by the loss of SQDG. On the other hand, exposure of the cells to 41°C for 120 min in the dark decreased the PSII activity to 70% and 50% of the initial levels in the wild type and hf-2, respectively, which implies that the PSII activity, in the absence of SQDG, becomes less stable under heat-stress conditions. PSII inactivated to 60% of the initial level by dark incubation at 41°C was reactivated by following illumination even at 41°C to more than 90% in the wild type, but only to 70% in hf-2. These results suggest that PSII inactivated by heat recovers through some mechanism dependent on light, and that SQDG participates in functioning of the mechanism. The conformational disorder of PSII caused by the defect in SQDG might be correlated with the increased susceptibility of its activity to heat-stress.

元の言語English
ページ(範囲)245-251
ページ数7
ジャーナルPlanta
217
発行部数2
DOI
出版物ステータスPublished - 2003 6 1
外部発表Yes

ASJC Scopus subject areas

  • Genetics
  • Plant Science

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