Internal structure of chlorosomes from brown-colored chlorobium species and the role of carotenoids in their assembly
Language English Country United States Media print-electronic
Document type Journal Article, Research Support, Non-U.S. Gov't
PubMed
16731553
PubMed Central
PMC1518626
DOI
10.1529/biophysj.106.084228
PII: S0006-3495(06)71854-9
Knihovny.cz E-resources
- MeSH
- Bacteriochlorophylls chemistry metabolism MeSH
- Models, Biological MeSH
- Models, Chemical * MeSH
- Chlorobium chemistry metabolism ultrastructure MeSH
- Carotenoids chemistry metabolism MeSH
- Organelles chemistry ultrastructure MeSH
- Computer Simulation MeSH
- Light-Harvesting Protein Complexes chemistry metabolism ultrastructure MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Names of Substances
- Bacteriochlorophylls MeSH
- Carotenoids MeSH
- Light-Harvesting Protein Complexes MeSH
Chlorosomes are the main light harvesting complexes of green photosynthetic bacteria. Recently, a lamellar model was proposed for the arrangement of pigment aggregates in Chlorobium tepidum chlorosomes, which contain bacteriochlorophyll (BChl) c as the main pigment. Here we demonstrate that the lamellar organization is also found in chlorosomes from two brown-colored species (Chl. phaeovibrioides and Chl. phaeobacteroides) containing BChl e as the main pigment. This suggests that the lamellar model is universal among green sulfur bacteria. In contrast to green-colored Chl. tepidum, chlorosomes from the brown-colored species often contain domains of lamellar aggregates that may help them to survive in extremely low light conditions. We suggest that carotenoids are localized between the lamellar planes and drive lamellar assembly by augmenting hydrophobic interactions. A model for chlorosome assembly, which accounts for the role of carotenoids and secondary BChl homologs, is presented.
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Structural and functional roles of carotenoids in chlorosomes
Structure of chlorosomes from the green filamentous bacterium Chloroflexus aurantiacus
Effect of quinones on formation and properties of bacteriochlorophyll c aggregates
