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Internal structure of chlorosomes from brown-colored Chlorobium species and the role of carotenoids in their assembly

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

© Biophysical Journal, 2006, vol. 91, núm. 4, p.1433-1440

Biophysical Society

Author: Psencik, Jakub
Arellano, Juan B.
Ikonen, Teemu P.
Borrego i Moré, Carles
Laurinmaki, Pasi A.
Butcher, Sarah J.
Serimaa, Ritva E.
Tuma, Roman
Date: 2006
Abstract: 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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Citation: Psencik, J., Arellano, J.B., Ikonen, T.P., Borrego, C.M., Laurinmaki, P.A., Butcher, S.J., Serimaa, R.E.. et al. (2006). Internal structure of chlorosomes from brown-colored Chlorobium species and the role of carotenoids in their assembly. Biophysical Journal, 91 (4), 1433-1440. Recuperat 15 de setembre de 2011, a doi:10.1529/biophysj.106.084228
ISSN: 0006-3495
Document access: http://hdl.handle.net/10256/3563
Language: eng
Publisher: Biophysical Society
Collection: Reproducció digital del document publicat a: http://dx.doi.org/10.1529/biophysj.106.084228
Articles publicats (D-B)
Is part of: © Biophysical Journal, 2006, vol. 91, núm. 4, p.1433-1440
Rights: Tots els drets reservats
Subject: Bacteris fotosintetitzadors
Carotenoides
Pigments fotosintètics
Carotenoids
Photosynthetic bacteria
Photosynthetic pigments
Title: Internal structure of chlorosomes from brown-colored Chlorobium species and the role of carotenoids in their assembly
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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