Decrease in the efficiency of the electron donation to tyrosine Z of photosystem II in an SQDG-deficient mutant of Chlamydomonas

Ayumi Minoda*, Kintake Sonoike, Katsuhiko Okada, Norihiro Sato, Mikio Tsuzuki

*この研究の対応する著者

研究成果: Article査読

55 被引用数 (Scopus)

抄録

Photosystem (PS) II activity of a sulfoquinovosyl diacylglycerol (SQDG)-deficient mutant (hf-2) of Chlamydomonas was partially decreased compared with that of wild-type. The susceptibility to 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU) was also modified in the mutant. Photometric measurements in the isolated thylakoid membranes of hf-2 revealed that the lowered activity in the mutant was derived from a decrease in the efficiency of the electron donation from water to tyrosine Z, not from the efficiency of the electron transport from QA to QB. This result was confirmed by the decay kinetics of chlorophyll fluorescence determined in vivo. We conclude that SQDG contributes to maintaining the conformation of PSII complexes, particularly that of D1 polypeptides, which are necessary for maximum activities in Chlamydomonas.

本文言語English
ページ(範囲)109-112
ページ数4
ジャーナルFEBS Letters
553
1-2
DOI
出版ステータスPublished - 2003 10月 9
外部発表はい

ASJC Scopus subject areas

  • 生物理学
  • 構造生物学
  • 生化学
  • 分子生物学
  • 遺伝学
  • 細胞生物学

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