Immunoelectron microscopic studies on the behavior of LHCP II in Euglena

Tetsuaki Osafune

doi:10.5685/plmorphol.8.45

著者情報

キーワード: Light-harvesting chlorophyll a/b complex, LHCP II apoprotein, Golgi, compartmentalized osmiophilic structure(COS), Euglena

ジャーナルフリー

1996 年 8 巻 1 号 p. 45-58

DOI https://doi.org/10.5685/plmorphol.8.45

詳細

Published: 1996 Received: - Available on J-STAGE: 2010/06/28 Accepted: - Advance online publication: - Revised: -
訂正情報
訂正日: 2010/06/28 訂正理由: - 訂正箇所: PDFファイル訂正内容: -

訂正日: 2010/06/28 訂正理由: - 訂正箇所: キーワード情報訂正内容: Wrong : Key words. Light-harvesting chlorophyll a/b complex, LHCP II apoprotein, Golgi, compartmentalized osmiophilic structure(COS), Euglena.
Right : Light-harvesting chlorophyll a/b complex, LHCP II apoprotein, Golgi, compartmentalized osmiophilic structure(COS), Euglena

訂正日: 2010/06/28 訂正理由: - 訂正箇所: 引用文献情報訂正内容: Wrong : E
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Houlne, G., and Schantz, R.(1987). Molecular analysis of the transcripts encoding the light-harvesting chlorophyll a/b protein in Euglena gracilis: unusual size of the mRNA. Curr. Genet, 12, 611-616.
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Osafune, T., Klein, S., and Schiff, J. A.(1980). Events surrounding the early development of Euglena chloroplasts. 18. Structure of the developing proplastid in the first hours of illumination from serial sections of wild-type cells. J. Ultrastructure Res., 73, 77-90.
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抄録

Cells of Euglena contain a light-harvesting chlorophyll a/b complex associated with photosystem II. In Euglena, the formation of the26.5kDa principal light-harvesting chlorophyll a/b binding protein of photosystem II(LHCP II)has a number of unusual features. The precursors to LHCP II are large polyproteins containing multiple copies of LHCP II, and photocontrol of their formation is largely translational. Under conditions favoring LHCP II accumulation in the thylakoids, a reaction with anti-LHCP II antibody can be observed in the Golgi by immunogold electron microscopy. The timing of the immunoreaction in the Golgi in synchronous cells and in cells undergoing normal light-induced chloroplast development suggests that the nascent LHCP II passes through the Golgi on the way to the thylakoids. The compartmentalized osmiophilic structure(COS)also shows an immunoreation. These observations, and others discussed in this paper, suggest that light permits translation of polyprotein LHCP II precursors on cytoplasmic ribosomes of the rough endoplasmic reticulum(ER)and that these pass through the ER to the Golgi where, presumably, further modifications take place. Since an LHCP II immunoreaction is found in Golgi vesicles, these may transport the nascent LHCP II to the plastid and facilitate its uptake.

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