Synthesis and Degradation of Chloroplast Sulfolipid in Green Alga, <i>Chlamydomonas reinhardtii</i>

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  • Sugimoto Koichi
    School of Life Sciences, Tokyo University of Pharmacy and Life Sciences School of Medicine, Yamaguchi University Center for Ecological Research, Kyoto University

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  • 緑藻クラミドモナスが行う葉緑体スルフォ脂質の代謝
  • リョクソウ クラミドモナス ガ オコナウ ヨウリョクタイ スルフォ シシツ ノ タイシャ

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<p>Almost all of oxygenic photosynthetic organisms contain sulfolipid, sulfoquinovosyl diacylglycerol (SQDG) in the photosynthetic membranes. The physiological functions of SQDG in the photosynthetic membranes such as the maintaining of structural and functional integrity of photosystem II are well investigated from cyanobacteria to seed plants. On the other hand, the molecular mechanism of SQDG metabolism is just now emerging. In this paper, the systems of SQDG-synthesis and -degradation were reviewed and the regulation of the system was referred. The system of SQDG degradation required de novo synthesis of mRNA(s) and protein(s) and the regulatory proteins for sulfur acclimation under sulfur-starved conditions. Additionally, biodiversity of the capacity of SQDG degradation induced by the sulfur starvation was surveyed among some organisms. From these results, it was implied that the system of SQDG degradation was derived not from the ancestral cyanobacteria, the origin of chloroplasts, but from the host cell of primary symbiosis and was conserved through the evolution of eukaryotic photosynthetic organisms.</p>

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