Disease relevance of Rhodospirillaceae

• Ornithine lipids were found in large amounts in most Rhodospirillaceae, but were absent in Ectothiorhodospira and in the other Chromatiaceae [1].
• It was found that the genus Stella belongs to the order Rhodospirillales in the family Rhodospirillaceae, and not to the Acetobacteraceae [2].
• In Chromatium vinosum, cysteine synthase was found to be constitutive, while in the Rhodospirillaceae tested the enzyme is repressed by sulfide [3].
• Nicotine and 2-(4-chlorophenylthio)triethylammonium chloride (CPTA) each inhibit production of the normal carotenoids of Rhodomicrobium vannielii (Rhodospirillaceae), especially rhodopin, beta-carotene and spirillixanthin, and cause the accumulation of lycopene [4].

High impact information on Rhodospirillaceae

• A concern voiced in connection with recent sequencing of cytochrome c from the Rhodospirillaceae or purple non-sulphur photosynthetic bacteria is that molecular information might be of little use in deciphering bacterial phylogeny because of the possibility of lateral transfer of genes and the consequent scrambling of the genetic record [5].
• Lipid A analyses confirm not only the present taxa of the purple nonsulfur bacteria (formerly Rhodospirillaceae), but also phylogenetical relatedness of distinct phototrophic to distinct non-phototrophic bacteria, as was suggested by cataloguing 16S rRNA [6].
• The levels of phosphatidylethanolamine (27 to 28%), phosphatidylglycerol (23 to 24%), and phosphatidylcholine (11 to 18%) were very similar in cells grown aerobically or phototrophically at a high light intensity, consistent with findings for another member of Rhodospirillaceae [7].
• With one exception, phosphoribulokinase from the Rhodospirillaceae requires reduced nicotinamide adenine dinucleotide for maximum activity [8].
• Taurine metabolism by two phototrophically grown purple nonsulfur bacteria enrichment isolates has been examined [9].

Chemical compound and disease context of Rhodospirillaceae

• Isolation and growth rates of methanol utilizing Rhodospirillaceae [10].
• Other Rhodospirillaceae were tested for isocitrate lyase and malate synthase activity after growth with acetate; they could be divided into three groups: 1. organisms possessing both enzymes; 2. organisms containing malate synthase only; 3 [11].
• Lipid A backbone was found to consist of 2,3-diamino-2,3-dideoxy-D-glucose, which up to this time has only been detected in group I of purple nonsulfur bacteria and their non-phototrophic relatives [12].

Biological context of Rhodospirillaceae

• Amino acid sequence studies of cytochromes c from Rhodospirillaceae, other bacteria and eukaryotic organisms (Dickerson, 1980) have led to the recognition of four different groups of cytochrome c molecules (long, medium and two groups of short protein chains) [13].

Gene context of Rhodospirillaceae

• The disagreement between cytochrome c sequences and the standard taxonomy of the Rhodospirillaceae in Bergey's Manual is not a problem [5].

References