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Título: | Effect of carotenoid biosynthesis inhibition on the chlorosome organization in Chlorobium phaeobacteroides strain CL1401 |
Autor: | Arellano, Juan B. CSIC ORCID ; Psencik, Jakub; Borrego, Carles M.; Ma, Ying-Zhong; Guyoneaud, Rémy; García-Gil, L. Jesús; Gillbro, Tomas | Palabras clave: | Carotenoids Chlorosomes Chlorobium phaeobacteroides Bacteriochlorophyll isorenieratene Energy transfer |
Fecha de publicación: | jun-2000 | Editor: | Wiley-Blackwell | Citación: | Photochemistry and Photobiology (2000) 71:715-723 | Resumen: | We have studied the effect of the absence of carotenoids on the organization of bacteriochlorophylls (BChls) in chlorosomes of Chlorobium (Chl.) phaeobacteroides strain CL1401. Carotenoid-depleted chlorosomes were obtained by means of 2-hydroxybiphenyl–supplemented cultures. In the presence of the inhibitor, isorenieratene (Isr) and β-Isr biosynthesis were inhibited to more than 95%, leading to an accumulation of the colorless precursor phytoene inside the chlorosomes. In addition, there was a 30–40% decrease in the baseplate BChl a content. The absorption spectrum of the carotenoid-depleted chlorosomes showed a 10 nm blue shift in the BChl e Qy absorption peak. Under reducing conditions, a decrease in the BChl a/BChl e fluorescence emission ratio was observed in carotenoid-depleted chlorosomes relative to that in control chlorosomes, caused mainly by the decrease in the BChl a content. The steady-state fluorescence emission anisotropy in the BChl e region dropped from ;0.24 for native chlorosomes to ;0.14 for carotenoid-depleted ones, indicating reorganization of BChl e. The circular dichroism (CD) signal of the carotenoid-depleted chlorosomes was increased two times in the BChl e Qy region. A simple model based on the structure proposed was used to explain the observed effects. Carotenoids might affect the angle between the direction of the BChl e Qy transition and the axis of the rod. The orientation of BChl a in the baseplate remains unchanged in carotenoid-depleted chlorosomes, although there is a partial loss of BChl a as a consequence of a decrease in the baseplate size. The carotenoids are most likely rather close to the BChls and appear to be important for the aggregate structure in Chl. phaeobacteroides. | Versión del editor: | http://www3.interscience.wiley.com/journal/119932103/abstract | URI: | http://hdl.handle.net/10261/8181 | DOI: | 10.1562/0031-8655(2000)0710715EOCBIO2.0.CO2 |
Aparece en las colecciones: | (IRNASA) Artículos |
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