Disease relevance of Chlorobi

• Unlike the bacteriochlorophylls c, d, and e of the Chlorobiaceae, bacteriochlorophyll cs of Chloroflexus is not a mixture of isomeric and homologous molecules; 2. the esterifying alcohol of the propionic acid side chain is neither farnesol nor another isoprenoid alcohol, but is the straight chain aliphatic (C-18) stearylalcohol [1].
• In the presence of acetate, ethanol or propanol, Desulfuromonas strains form robust growing syntrophic mixed cultures with phototrophic green sulfur bacteria [2].
• Several purple and green sulfur bacteria (genera Chromatium, Thiocapsa and Chlorobium) were tested for their sensitivity to different antimicrobial agents by a disc diffusion assay, using thioacetamide as a source of hydrogen sulfide for plate growth [3].
• Phototrophy as a mode of energy metabolism occurs in the phylogenetic divisions of a) "Gram-positive eubacteria", b) "Cyanobacteria/Chloroplasts", c) "Green Sulfur Bacteria", d) "Chloroflexus and related taxa", and e) "Purple Bacteria and related taxa", i.e. in five of the nine phylogenetic divisions of eubacteria [4].

High impact information on Chlorobi

• This autobiographical chapter summarizes the author's work with a defined mineral medium for fastidious sulfide-oxidizing phototrophic purple and green sulfur bacteria that were known already from Winogradsky's and Lauterborn's descriptions [5].
• Green sulfur bacteria are anaerobes that require light for growth by the oxidation of sulfur compounds to reduce CO2 to organic carbon, and are capable of photosynthetic growth at extremely low light intensities [6].
• The photosynthetic reaction center (RC) of green sulfur bacteria contains two [4Fe-4S] clusters named F(A) and F(B), by analogy with photosystem I (PS I) [7].
• From our data, there is no evidence for involvement of menaquinone in charge separation in the reaction center of green sulfur bacteria [8].
• Stable carbon isotope fractionation values of farnesol indicated an autotrophic growth mode of the green sulfur bacteria [9].

Chemical compound and disease context of Chlorobi

• Maximum light-dependent H(14)CO(3)(-) fixation in the chemocline in the presence of 3-(3,4-dichlorophenyl)-1,1-dimethylurea suggested that there was anaerobic autotrophic growth of the green sulfur bacteria [10].
• Carbon dioxide is fixed largely by the reductive tricarboxylic acid (RTCA) cycle in green sulfur bacteria [11].
• The effects of epimerization at the 3(1)-position of bacteriochlorophylls c on their aggregation in chlorosomes of green sulfur bacteria. Control of the ratio of 3(1) epimers by light intensity [12].
• The dsrA gene, encoding the alpha subunit of 'reverse' siroheme sulfite reductase, is also present in two species of green sulfur bacteria pointing to an important and universal role of this enzyme and probably other proteins encoded in the dsr locus in the oxidation of stored sulfur by phototrophic bacteria [13].
• Our results provide a model system for studying the redox-dependent antenna quenching in green sulfur bacteria because the antennas in these bacteria inherently exhibit a sensitivity to O(2) similar to the quinone-supplemented cells of Cfx. aurantiacus [14].

Gene context of Chlorobi

• The diversity of purple and green sulfur bacteria in the multilayered sediments of the Ebro Delta was investigated [15].
• The common ancestor of all extant reaction centers was probably similar to the homodimeric RC1 of present-day green sulfur bacteria (Chlorobiaceae) and heliobacteria [16].
• Events began to turn when green sulfur bacteria were found to contain ferredoxin-coupled ketoacid-oxidoreductases [17].

References