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  • 1
    Electronic Resource
    Electronic Resource
    New carotenoids from the thermophilic green sulfur bacterium Chlorobium tepidum: 1′,2′-dihydro-γ-carotene, 1′,2′-dihydrochlorobactene, and OH-chlorobactene glucoside ester, and the carotenoid composition of different strains (1997)
    Springer
    Archives of microbiology 168 (1997), S. 270-276 
    Details
    ISSN: 1432-072X
    Keywords: Key words Carotenoid biosynthesis ; Green sulfur ; bacteria ; Thermophily ; Chlorobium tepidum ; 1′ ; 2′-Dihydro-γ-carotene ; 1′ ; 2′-Dihydrochlorobactene ; OH-Chlorobactene glucoside ester ; Nicotine ; Bacteriochlorophyll c
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The complete carotenoid composition of the thermophilic green sulfur bacterium Chlorobium tepidum strain TNO was determined by spectroscopic methods. Major carotenoids were four kinds of carotenes: γ-carotene, chlorobactene, and their 1′,2′-dihydro derivatives (1′,2′-dihydro-γ-carotene and 1′,2′-dihydrochlorobactene). In lesser amounts, hydroxyl γ-carotene, hydroxyl chlorobactene, and their glucoside fatty acid esters were found. The only esterified fatty acid present was laurate, and OH-chlorobactene glucoside laurate is a novel carotenoid. In other strains of C. tepidum, the same carotenoids were found, but the composition varied from strain to strain. The overall pigment composition in cells of strain TNO was 4 mol carotenoids and 40 mol bacteriochlorophyll c per mol bacteriochlorophyll a. The effects of nicotine on carotenoid biosynthesis in C. tepidum differed from those in the thermophilic green nonsulfur bacterium Chloroflexus aurantiacus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002030050498
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  • 2
    Electronic Resource
    Electronic Resource
    Pheophytinization of bacteriochlorophyll c and energy transfer in cells of Chlorobium tepidum (1999)
    Springer
    Archives of microbiology 172 (1999), S. 40-44 
    Details
    ISSN: 1432-072X
    Keywords: Key words Bacteriochlorophyll c ; Bacteriochlorophyll a ; Bacteriopheophytin c ; Chlorobium tepidum ; Chlorosome ; Energy transfer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Bacteriochlorophyll (BChl) c in whole cells of Chlorobium tepidum grown at 46 °C changed into bacteriopheophytin (BPhe) c within 10 days after reaching full growth. When a small amount of C. tepidum cells in which BChl c had been completely pheophytinized were transferred to a new culture medium, normal growth was observed after a short lag phase, and the absorption spectrum of the growing cells showed the presence of a normal amount of BChl c. During the growth of C. tepidum in the new culture, the BChl c concentration was nearly proportional to the cell density measured by turbidity (OD640). These results indicate that C. tepidum can survive even when BChl c has been completely pheophytinized and that BChl c is newly synthesized in such cells when transferred to a new culture medium. In partly pheophytinized cells, upon excitation of BPhe c at 550 nm the fluorescence emission spectrum showed maxima at 775 and 810 nm, which correspond to emissions from BChl c and BChl a, respectively. This indicates energy transfer from BPhe c to BChl c and BChl a. In cells in which BChl c was completely pheophytinized, fluorescence measurements were indicative of direct energy transfer from BPhe c to baseplate BChl a. These findings suggest that when BChl c in C. tepidum cells is pheophytinized, the product (BPhe c) remains in the chlorosomes and continues to work as a light-harvesting pigment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002030050737
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