English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/3646
COMPARTIR / IMPACTO:
Estadísticas
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:
Título

Effect of Carotenoids and Monogalactosyl Diglyceride on Bacteriochlorophyll c Aggregates in Aqueous Buffer: Implications for the Self-assembly of Chlorosomes

AutorKlinger, Pavel; Arellano, Juan B. ; Vácha, Frantisek; Hála, Jan; Psencik, Jakub
Palabras claveChlorosome
Bacteriochlorophyll
Aggregates
Carotenoid
Monogalactosyl diglyceride
Dimers
Fecha de publicaciónnov-2004
EditorAmerican Society for Photobiology
CitaciónPhotochemistry and Photobiology
(2004) 80:572-578.
ResumenAggregation of bacteriochlorophyll (BChl) c from chlorosomes, the main light-harvesting complex of green bacteria, has been studied in aqueous buffer. Unlike other chlorophyll-like molecules, BChl c is rather soluble in aqueous buffer, forming dimers. When BChl c is mixed with carotenoids (Car), the BChl c Qy transition is further redshifted, in respect to that of monomers and dimers. The results suggest that Car are incorporated in the aggregates and induce further aggregation of BChl c. The redshift of the BChl c Qy band is proportional to the Car concentration. In contrast, the mixture of bacteriochlorophyllide (BChlide) c, which lacks the nonpolar esterifying alcohol, does not form aggregates with Car in aqueous buffer or nonpolar solvents. Instead, the position of the BChlide c Qy transition remains unshifted in respect to that of the monomeric molecule, and Car precipitates with the course of time in aqueous buffer. Similar effects on both BChl c and BChlide c are also observed when monogalactosyl diglyceride (MGDG), which forms the monolayer envelope of chlorosomes, is used instead of (or together with) Car. The results show that the hydrophobic interactions of the BChl c esterifying alcohols with themselves and the nonpolar carbon skeleton of Car, or the fatty acid tails of MGDG, are essential driving forces for BChl aggregation in chlorosomes.
Versión del editorhttp://www3.interscience.wiley.com/journal/119921633/abstract
URIhttp://hdl.handle.net/10261/3646
DOI10.1111/j.1751-1097.2004.tb00131.x
Aparece en las colecciones: (IRNASA) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
Klinger_et_al_2004_DCSIC.pdf296,33 kBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo
 


NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.