The light-harvesting complex II (B800-850) of Rhodobacter sulfidophilus: characterization and formation under different growth conditions.
FEMS Microbiol Lett
; 126(1): 7-11, 1995 Feb 01.
Article
em En
| MEDLINE
| ID: mdl-7896080
ABSTRACT
The photosynthetic bacterium Rhodobacter sulfidophilus is able to grow chemotrophically and phototrophically at a broad range of light intensities. In contrast to other facultative phototrophs, R. sulfidophilus synthesizes reaction center and light-harvesting (LH) complexes, B870 (LHI) and B800-850 (LHII) even under full aerobic conditions in the dark. The content of bacteriochlorophyll (BChl) varied from 3.8 micrograms Bchl per mg cell protein when grown at high light intensity (20,000 lux) to 60 micrograms Bchl per mg cell protein when grown at low light intensities (6 lux). After a shift from high light to low light conditions, the size of the photosynthetic unit increased by a factor of 4. Chromatographic analysis of the LHII complex, isolated and purified from cells grown phototrophically (at high and low light intensities) and chemotrophically, could resolve only one type of alpha and one type of beta polypeptide in the purified complex, of which the N-terminal sequences have been determined.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Rhodobacter
/
Complexo de Proteínas do Centro de Reação Fotossintética
/
Complexos de Proteínas Captadores de Luz
Idioma:
En
Revista:
FEMS Microbiol Lett
Ano de publicação:
1995
Tipo de documento:
Article