Variability in the synthesis of cytochromes f and b-563 during the cell cycle of Euglena gracilis |
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Authors: | Beatrix Kohnke Peter Brandt |
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Institution: | Abteilung für Experimentelle Phykologie, Pflanzenphysiologisches Institut der Universität Göttingen, Untere Karspüle 2, D - 3400 Göttingen F.R.G. |
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Abstract: | The study of the successive formation of the photosynthetic apparatus in Euglena gracilis (Brandt, P. and Von Kessel, B. (1983) Plant Physiol. 72, 616–619) was extended to the determination of the stage-specific synthesis of cytochrome complex during the cell cycle of this alga. Most of the cytochrome f (33 kDa) has properties of an intrinsic membrane protein, but part of it is soluble. Cytochrome b-563 (18 kDa) is only intrinsic. The intensity of binding the intrinsic cytochromes in the thylakoids depends on the developmental stage of the organism. The light-independent synthesis of cytochrome f takes place prior to the assembly of the chlorophyll-protein complex I (CP I). Immediately after this assembly of CP I, cytochrome b-563 is synthesized in the light. Hence, the ratio cytochrome b-563/cytochrome f changes during the cell cycle of E. gracilis. The physiological implication of presumably non-complexed cytochrome f and of complex-bound cytochromes f and b-563 on the stage-specific efficiency of photosynthesis of E. gracilis is discussed. |
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Keywords: | Cytochrome b-563 Cytochrome f Photosystem I Cell cycle Thylakoid membrane (E gracilis) CPa chlorophyll-protein complex related to Photosystem II CP I chlorophyll-protein complex related to Photosystem I LHCP light-harvesting chlorophyll-protein complex PS |
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