Nomenclature Abstract for Chlorobium tepidum Wahlund et al. 1996.

2003 ◽  
Author(s):  
Charles Thomas Parker ◽  
Nicole Danielle Osier ◽  
George M Garrity
Keyword(s):  
Chlorobium Tepidum

Effect of Alkaline Treatment on Bacteriochlorophyll a, Quinones and Energy Transfer in Chlorosomes from Chlorobium tepidum and Chlorobium phaeobacteroides

1999 ◽  
Vol 69 (3) ◽  
pp. 322 ◽  
Author(s):  
Cornelis A. van Walree ◽  
Yumiko Sakuragi ◽  
Dorte B. Steensgaard ◽  
Carola S. Bösinger ◽  
Niels-Ulrik Frigaard ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Alkaline Treatment ◽  
Bacteriochlorophyll A ◽  
Chlorobium Tepidum ◽  
Chlorobium Phaeobacteroides

Purification and Properties of Cytochrome C-553 from the Green Sulfur Bacterium Chlorobium Tepidum

1998 ◽  
pp. 1593-1596 ◽  
Author(s):  
Fabiyola Selvaraj ◽  
Dominica Devine ◽  
Wenli Zhou ◽  
Daniel C. Brune ◽  
Michael T. Lince ◽  
...  
Keyword(s):  
Cytochrome C ◽  
Chlorobium Tepidum ◽  
Green Sulfur Bacterium ◽  
Purification And Properties ◽  
Green Sulfur

scholarly journals Chlorobium tepidum Mutant Lacking Bacteriochlorophyll c Made by Inactivation of the bchK Gene, Encoding Bacteriochlorophyll c Synthase

2002 ◽  
Vol 184 (12) ◽  
pp. 3368-3376 ◽  
Author(s):  
Niels-Ulrik Frigaard ◽  
Ginny D. Voigt ◽  
Donald A. Bryant
Keyword(s):  
Photosynthetic Reaction Center ◽  
Chlorobium Tepidum ◽  
Wild Type ◽  
Bacteriochlorophyll C ◽  
Gene Encoding ◽  
Thin Sections ◽  
Insertional Inactivation ◽  
In The Wild ◽  
Green Sulfur ◽  
Isoprenoid Quinones

ABSTRACT The gene encoding bacteriochlorophyll (BChl) c synthase was identified by insertional inactivation in the photosynthetic green sulfur bacterium Chlorobium tepidum and was named bchK. The bchK mutant of C. tepidum was rusty-orange in color and completely lacked BChl c. Because of the absence of the BChl c antenna, the mutant grew about seven times slower than the wild type at light intensities that were limiting to the wild type (<90 μmol m−2 s−1). Various pheophorbides, which probably represent precursors of BChl c which had lost magnesium, accumulated in the mutant cells. A small fraction of these pheophorbides were apparently esterified by the remaining chlorophyll (Chl) a and BChl a synthases in cells. The amounts of BChl a, Chl a, isoprenoid quinones, carotenoids, Fenna-Matthews-Olson protein, and chlorosome envelope protein CsmA were not significantly altered on a cellular basis in the mutant compared to in the wild type. This suggests that the BChl a antennae, photosynthetic reaction centers, and remaining chlorosome components were essentially unaffected in the mutant. Electron microscopy of thin sections revealed that the mutant lacked normal chlorosomes. However, a fraction containing vestigial chlorosomes, denoted “carotenosomes,” was partly purified by density centrifugation; these structures contained carotenoids, isoprenoid quinones, and a 798-nm-absorbing BChl a species that is probably protein associated. Because of the absence of the strong BChl c absorption found in the wild type, the bchK mutant should prove valuable for future analyses of the photosynthetic reaction center and of the roles of BChl a in photosynthesis in green bacteria. An evolutionary implication of our findings is that the photosynthetic ancestor of green sulfur bacteria could have evolved without chlorosomes and BChl c and instead used only BChl a-containing proteins as the major light-harvesting antennae.

Structures and Organization of Bacteriochlorophyll c's in Chlorosomes from a New Thermophilic Bacterium Chlorobium tepidum.

1993 ◽  
Vol 66 (1) ◽  
pp. 231-237 ◽  
Author(s):  
Tsunenori Nozawa ◽  
Katsunori Ohtomo ◽  
Manabu Suzuki ◽  
Yumi Morishita ◽  
Michael T. Madigan
Keyword(s):  
Thermophilic Bacterium ◽  
Chlorobium Tepidum
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