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Development and pigmentation of chlorosomes in Chloroflexus aurantiacus strain Ok-70-fl
Authors:K Schmidt  M Maarzahl  F Mayer
Institution:(1) Institut für Mikrobiologie der GSF und der Universität Göttingen, Grisebachstr. 8, D-3400 Göttingen, Federal Republic of Germany
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 (ldquochlorosome bagsrdquo) 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, gamma- and beta-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
Keywords:Chloroflexus aurantiacus  Chlorosomes  Cytoplasmic membranes  Bacteriochlorophyll  Cardenoids  Pigment-protein complexes
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