Development and pigmentation of chlorosomes in Chloroflexus aurantiacus strain Ok-70-fl |
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Authors: | K Schmidt M Maarzahl F Mayer |
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Institution: | (1) Institut für Mikrobiologie der GSF und der Universität Göttingen, Grisebachstr. 8, D-3400 Göttingen, Federal Republic of Germany |
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Abstract: | The development of chlorosomes and their pigmentation were studied by growing Chloroflexus aurantiacus strain Ok-7o-fl first under conditions under which BChl c-synthesis is low (50°C, 2000 lux and 30°C, 1500 lux) and subsequently under conditions promoting high BChl c-synthesis (50°C, 400 lux). Electron microscopic observations on and chemical analyses of isolated cell components showed that in BChl c-depleted cells chlorosome-like structures ( chlorosome bags ) are attached to fragments of cytoplasmic membranes. These chlorosome bags exhibit a periodic fine structure caused by the construction of the baseplates of the chlorosomes. The baseplates are closely attached to the cytoplasmic membrane, they are rich in phospholipids and apparently contain a 790 nm-BChl a-complex. Chlorosome bags of BChl c-depleted cells always contain a limited amount of light-harvesting pigment complexes (BChlc, - and -carotene). The light-harvesting system is restored (50°C, 400 lux) by first refilling the existing chlorosome bags before cell division takes place.Abbreviations BChl
Bacteriochlorophyll
- LH
Light-harvesting complex
- RC
Reaction center |
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Keywords: | Chloroflexus aurantiacus Chlorosomes Cytoplasmic membranes Bacteriochlorophyll Cardenoids Pigment-protein complexes |
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