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  • 1
    Digitale Medien
    Digitale Medien
    Quinones of phototrophic purple bacteria (1984)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 25 (1984), S. 0 
    Details
    ISSN: 1574-6968
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Abstract The quinone composition of the recognized species of the phototrophic purple nonsulfur bacteria, the Ectothiorhodospiraceae, and some Chromatiaceae species has been determined. Altogether more than 50 strains of 33 species have been investigated. Some of the purple nonsulfur bacteria have Q-10 as sole quinone component, while others have Q-10, Q-9, or Q-8, respectively, together with menaquinones of the same isoprenoid chain length as the major components. Rhodoquinone is present in Rhodospirillum rubrum and Rhodospirillum photometricum. The Ectothiorhodospira species have either Q-8 and MK-8, like the Chromatiaceae species, or Q-7 and MK-7 as the major components.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1574-6968.1984.tb01381.x
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  • 2
    Digitale Medien
    Digitale Medien
    Rhodopseudomonas adriatica sp. nov., a new species of the Rhodospirillaceae, dependent on reduced sulfur compounds (1984)
    Springer
    Archives of microbiology 137 (1984), S. 256-261 
    Details
    ISSN: 1432-072X
    Schlagwort(e): Rhodospirillaceae ; Rhodopseudomonas adriatica ; Taxonomic characterization ; Sulfur metabolism ; Rhodobacter adriaticus
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract A new purple nonsulfur bacterium was isolated from enrichment cultures of a sulfide-containing marine lagoon. The bacterium is similar to Rhodopseudomonas capsulata and is described as a new species of the genus Rhodopseudomonas: Rhodopseudomonas adriatica. Cells are non-motile, 0.5–0.8 μm by 1.3–1.8 μm, and multiply by binary fission. Intracytoplasmic membranes are of the vesicular type. The photosynthetic pigments are bacteriochlorophyll a and carotenoids of the spheroidene group. Growth is possible anaerobically in the light and at low pO2 in the dark. Biotin and thiamine are required as growth factors. A wide variety of organic compounds, as well as sulfide and thiosulfate, are used as photosynthetic electron donors. Sulfide is oxidized to elemental sulfur, which is subsequently converted to sulfate, whereas thiosulfate oxidation occurs without measurable intermediate. Rhodopseudomonas adriatica is unable to assimilate sulfate, growth is only possible in the presence of a reduced sulfur compound.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00414554
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  • 3
    Digitale Medien
    Digitale Medien
    Towards a phylogeny of phototrophic purple sulfur bacteria — the genus Ectothiorhodospira (1984)
    Springer
    Archives of microbiology 137 (1984), S. 366-370 
    Details
    ISSN: 1432-072X
    Schlagwort(e): Ectothiorhodospira ; Chromatium ; Taxonomy ; Phylogeny ; Evolution of sulfur metabolism ; 16S rRNA cataloguing
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Seven strains of five species of the genus Ectothiorhodospira were characterized by oligonucleotide cataloguing of their 16S rRNA in order to determine the phylogenetic relationship to one another and to other phototrophic purple bacteria. All representatives of Ectothiorhodospira are members of that line of descent defined by phototrophic purple sulfur bacteria and relatives, showing a moderate relationship to those phototrophic organisms forming globules of elemental sulfur inside the cell (Chromatium and relatives). The 5 Ectothiorhodospira species fall into two subgroups. E.halophila, E. halochloris and E. abdelmalekii form one, E. mobilis, E. shaposhnikovii and the unnamed strain BN 9906 form the second subgroup. Within the two subgroups the strains are closely related, while the degree of relatedness found between members of the two subgroups is more distant.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00410736
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  • 4
    Digitale Medien
    Digitale Medien
    Occurrence and evolutionary significance of two sulfate assimilation pathways in the rhodospirillaceae (1982)
    Springer
    Archives of microbiology 132 (1982), S. 197-203 
    Details
    ISSN: 1432-072X
    Schlagwort(e): Rhodopseudomonas ; Rhodospirillum ; Rhodomicrobium ; Rhodocyclus ; Sulfate assimilation ; Sulfonucleotide specifity ; Biochemical preparation of sulfonucleotides
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The ability to use adenosine 5′-phosphosulfate (APS) or 3′-phosphoadenosine 5′-phosphosulfate (PAPS) as the substrate for the initial reductive step in sulfate assimilation has been tested in most of the known Rhodospirillaceae species and in some chemotrophic bacteria. Improved and optimized methods for the synthesis and purification of the sulfonucleotides APS and PAPS are described. The production of acid volatile radioactivity from 35S-APS and 35S-PAPS was measured under various conditions in the presence and absence of non-labeled sulfate. Specific differences in the ability to reduce APS or PAPS were observed among the Rhodospirillaceae species and also the chemotrophic bacteria. APS was found to be the substrate of the thiolsulfotransferase in Rps. acidophila, Rps. globiformis, Rm. vannielii, Rc. purpureus, R. tenue, Rps. gelatinosa, in Alcaligenes eutrophus and Pseudomonas aeruginosa. PAPS was the substrate in Rps. capsulata, Rps. sphaeroides, Rps. sulfidophila, Rps. palustris, Rps. viridis, R. rubrum, R. fulvum, in Paracoccus denitrificans and in several Enterobacteriaceae. The presence of different enzymatic systems for sulfate reduction in the Rhodospirillaceae family is compared with their taxonomical grouping and their possible phylogenetic relatedness.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00508731
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  • 5
    Digitale Medien
    Digitale Medien
    Ectothiorhodospira vacuolata sp. nov., a new phototrophic bacterium from soda lakes (1981)
    Springer
    Archives of microbiology 130 (1981), S. 238-242 
    Details
    ISSN: 1432-072X
    Schlagwort(e): Phototrophic bacteria ; Ectothiorhodospira vacuolata ; Gas vacuoles ; Alkaliphilic bacteria ; Halophilic bacteria ; Anaerobic sulfide oxidation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract A new phototrophic bacterium was isolated from Jordanian and Kenyan alkaline salt lakes. Cells are rod shaped, 1.5 μm wide and 2–4 μm long, and motile by polar flagella. They divide by binary fission, and possess photosynthetic membranes as lamellar stacks similar to those in the other species of the genus Ectothiorhodospira and the brown colored Rhodospirillum species. The presence of bacteriochlorophyll a and carotenoids of the normal spirilloxanthin series is indicated by the absorption spectra of living cells. Under certain growth conditions the cells form gas vacuoles, may become immotile and float to the top of the culture medium. Sulfide and thiosulfate are used as photosynthetic electron donors. During the oxidation of sulfide to sulfate, elemental sulfur is formed, which is accumulated outside the cells. The organisms are strictly anaerobic, do not require vitamins, are moderately halophilic and need alkaline pH-values for growth. The new species Ectothiorhodospira vacuolata is proposed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00459526
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  • 6
    Digitale Medien
    Digitale Medien
    Sulfate assimilation in Rhodopseudomonas globiformis (1981)
    Springer
    Archives of microbiology 130 (1981), S. 234-237 
    Details
    ISSN: 1432-072X
    Schlagwort(e): Rhodospirillaceae ; Rhodopseudomonas globiformis ; Sulfate assimilation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Rhodopseudomonas globiformis is able to grow on sulfate as sole source of sulfur, but only at concentrations below 1 mM. Good growth was observed with thiosulfate, cysteine or methionine as sulfur sources. Tetrathionate supported slow growth. Sulfide and sulfite were growth inhibitory. Growth inhibition by higher sulfate concentrations was overcome by the addition of O-acetylserine, which is known as derepressor of sulfate-assimilating enzymes, and by reduced glutathione. All enzymes of the sulfate assimilation pathway. ATP-sulfurylase, adenylylphosphate-sulfotransferase, thiosulfonate reductase and O-acetylserine sulfhydrylase are present in R. globiformis. Sulfate was taken up by the cells and the sulfur incorporated into the amino acids cysteine, methionine and homocysteine. It is concluded, that the failure of R. globiformis to grow on higher concentrations of sulfate is caused by disregulation of the sulfate assimilation pathway. Some preliminary evidence for this view is given in comparing the activities of some of the involved enzymes after growth on different sulfur sources and by examining the effect of O-acetylserine on these activities.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00459525
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