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Plant and Cell Physiology, 1986, Vol. 27, No. 7 1241-1247
© 1986

Article

Chlorophyll-Protein Complexes Associated with Photosystem I Isolated from the Green Alga, Bryopsis maxima

Tadashi Itagaki1, Katsumi Nakayama and Mitsumasa Okada

Department of Biology, Faculty of Science, Toho University 2-2-1 Miyama, Funabashi, Chiba 274, Japan

Six chlorophyll (Chl)-protein complexes associated with photosystem I (CPla), and the PS I reaction center complex (CPl) were isolated from the thylakoid membranes of the green alga, Bryopsis maxima, by SDS-polyacrylamide gel electrophoresis. CPla had four polypeptides (22, 24, 25, 26 kDa) in addition to the 67 kDa polypeptide of CPl. These complexes may thus possibly be a combination of CPl and antenna complexes for PS I. Six CPla showed almost the same optical properties, with absorption maxima at 650 and 677 nm and contained carotene and a small amount of xanthophylls. The Chl a/b ratios of these CPla were about 2, while that of CPl was 14. CPla showed a fluorescence emission maximum at 695 nm; its excitation spectrum had peaks at 438, 470 and 540 nm, corresponding to the absorption maxima of Chl a, Chl b, xanthophylls, respectively. An antenna complex free of CPl has been detected in some plants but was not found in the present alga.

1Present address: Department of Botany, The University of Adelaide, Adelaide, S.A. 5001, Australia

(Received April 17, 1986; Accepted June 26, 1986)
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