Journal
FEBS LETTERS
Volume 581, Issue 28, Pages 5435-5439Publisher
WILEY
DOI: 10.1016/j.febslet.2007.10.045
Keywords
chlorosome; bacteriochlorophyll c; bacteriochlorophyll d; cryo-electron microscopy; Chlorobium tepidum
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Intact chlorosomes of Chlorobium tepidum were embedded in amorphous ice layers and examined by cryoelectron microscopy to study the long-range organization of bacteriochlorophyll ( BChl) layers. End-on views reveal that chlorosomes are composed of several multi-layer tubules of variable diameter (20-30 nm) with some locally undulating non-tubular lamellae in between. The multi-layered tubular structures are more regular and larger in a C. tepidum mutant that only synthesizes [8-ethyl, 12-methyl]-BChl d. Our data show that wild-type C. tepidum chlorosomes do not have a highly regular, long-range BChl c layer organization and that they contain several multilayered tubules rather than single-layer tubules or exclusively undulating lamellae as previously proposed. (c) 2007 Federation of European Biochemical Societies. Published by Elsevier B. V. All rights reserved.
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