日時	2000年 6月 1日（木）午後2時〜4時
場所	北大理学部5号館302室

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Phosphatidylglycerol (PG) is an important constituent of photosyntheticmembranes. This lipid class has been suggested to give functional andstructural background for photosynthetic processes. To avoid the difficultiesof in vitro system a mutant of Synechocystis PCC6803 was produced which is without functioning PG phosphate synthase a key enzyme for PG synthesis. The mutant cells can grow in the presence of externally added PG. Due to the deprivation of PG the photosynthetic activity of cells decreased. A closer look at the individual steps of photosynthetic electron transport revealed that the main affect is bound to PS II. The decreased level of PG also the affinity of quinone binding to the reaction center as was demonstrated by oxygen-evolution measurements. The fluorescence measurements showed that the energy flow between QA to QB slowed down and electrons were trapped at the level of QA.

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共催	北海道分子生物学研究会 日本生化学会 日本植物学会北海道支部 日本農芸化学会北海道支部 北海道農芸化学協会

連絡先	北大・地球環境・奥山英登志 電話　011-706-5545、e-mail hoku@ees.hokudai.ac.jp