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Plant and Cell Physiology, 1984, Vol. 25, No. 6 907-911
© 1984

Article

The Lipid Phase of Thylakoid and Cytoplasmic Membranes from the Blue-Green Algae (Cyanobacteria), Anacystis nidulans and Anabaena variabilis

Hajime Wada1,3, Ryo Hirasawa1, Tatsuo Omata2 and Norio Murata2,4

1Department of Chemistry, College of Arts and Sciences, University of Tokyo Komaba, Meguro-ku, Tokyo 153, Japan
2Department of Biology, College of Arts and Sciences, University of Tokyo Komaba, Meguro-ku, Tokyo 153, Japan
3Laboratory of Chemistry, Faculty of Science and Technology, Tokyo Denki University Present address: Hatoyama, Hiki-gun, Saitama 350-03, Japan

4To whom correspondence and reprint requests should be addressed.

The lipid phases of the thylakoid and cytoplasmic membranes from the blue-green alga, Anacystis nidulans, were studied by a spin-probe method using 2-(14-carboxytetradecyl)-2-ethyl-4,4-dimethyl-3-oxazolidinyloxyl. The thylakoid and cytoplasmic membranes of this alga were both in the liquid crystalline state at growth temperature, and in the phase separation state at about 0°C. The thylakoid membranes entered the phase separation state at a temperature higher than the cytoplasmic membranes. The lipid phase of the thylakoid membranes from Anabaena variabilis was studied in a similar way, and these membranes were found also to undergo the phase transition. The temperature for the onset of the phase separation and the fluidity of the membrane lipids of both algae depended on the growth temperature of the culture.

(Received April 9, 1984; Accepted June 1, 1984)
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