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Plant and Cell Physiology 2004 45(9):1325-1329; doi:10.1093/pcp/pch144
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© 2004 Oxford University Press

Short Communication

Requirement of Carotene Isomerization for the Assembly of Photosystem II in Synechocystis sp. PCC 6803

Kazumori Masamoto1,4, Shin-ichiro Hisatomi1, Isamu Sakurai2, Zoltán Gombos3 and Hajime Wada2

1 Biological Laboratory, Faculty of Education, Kumamoto University, Kurokami 2-40-1, Kumamoto, 860-8555 Japan
2 Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Komaba 3-8-1, Meguro-ku, Tokyo, 153-8902 Japan
3 Institute of Plant Biology, Biological Research Center of Hungarian Academy of Sciences, P.O. Box 521, Temesvári Körút 62, H-6701 Szeged, Hungary

Abstract

Carotene isomerase mutant (crtH mutant) cells of Synechocystis sp. PCC 6803 can accumulate ß-carotene under light conditions. However, the mutant cells grown under a light-activated heterotrophic growth condition contained detectable levels of neither ß-carotene nor D1 protein of the photosystem (PS) II reaction center, and no oxygen-evolving activity of PSII was detected. ß-Carotene and D1 protein appeared and a high level of PSII activity was detected after the cells were transferred to a continuous light condition. The PSI activities of thylakoid membranes from mutant cells were almost the same as those of thylakoid membranes from wild-type cells, both before and after transfer to the continuous light condition. These results suggest that ß-carotene is required for the assembly of PSII but not for that of PSI.

Footnotes

4 Corresponding author: E-mail, masamoto{at}gpo.kumamoto-u.ac.jp; FAX, +81-96-342-2531.


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