Ancylobacter rudongensis sp. nov., isolated from roots of Spartina anglica.
(1/27)
A curved, ring-like bacterium, strain AS 1.1761(T), isolated from the roots of Spartina anglica, was studied by a polyphasic approach. According to phylogenetic analysis, strain AS 1.1761(T) belongs to the genus Ancylobacter, with 99.21 % 16S rDNA sequence similarity to Ancylobacter aquaticus, the only species described so far in this genus. However, strain AS 1.1761(T) had no significant DNA-DNA binding with the type strain of A. aquaticus. In addition, strain AS 1.1761(T) differed from A. aquaticus in many phenotypic features. Based on molecular and phenotypic data, a novel species, Ancylobacter rudongensis sp. nov., is proposed. The type strain is AS 1.1761(T) (=JCM 11671(T)). (+info)
Phylogenetic relationships of the genera Stella, Labrys and Angulomicrobium within the 'Alphaproteobacteria' and description of Angulomicrobium amanitiforme sp. nov.
(2/27)
The unusually shaped bacteria of the genera Stella, Labrys and Angulomicrobium have been described based on their cell morphology and biochemistry. However, their phylogenetic relationships remain unresolved. An earlier study that was based on 5S rRNA gene sequences placed the genus Stella within the 'Alphaproteobacteria'. In the present report, polar lipids and 16S rRNA genes of the type strains of the two species in the genus Stella, Stella humosa DSM 5900(T) and Stella vacuolata DSM 5901(T), are studied, as well as the type strains of the monospecific genera Labrys (Labrys monachus VKM B-1479(T)) and Angulomicrobium (Angulomicrobium tetraedrale DSM 5895(T)). It was found that the genus Stella belongs to the order Rhodospirillales in the family Rhodospirillaceae, and not to the Acetobacteraceae. Whilst the position of the genus Angulomicrobium in the family Hyphomicrobiaceae was confirmed, the genus Labrys could not be placed into any known family, but was adjacent to the family 'Beijerinckiaceae'. In addition, data were obtained for strain VKM B-1336, which was shown not to belong to the genus Angulomicrobium, and strain NCIMB 1785(T) (=DSM 15561(T)), for which the name Angulomicrobium amanitiforme sp. nov. is proposed. (+info)
Identification of the bacterial endosymbionts of the marine ciliate Euplotes magnicirratus (Ciliophora, Hypotrichia) and proposal of 'Candidatus Devosia euplotis'.
(3/27)
This paper reports the identification of bacterial endosymbionts that inhabit the cytoplasm of the marine ciliated protozoon Euplotes magnicirratus. Ultrastructural and full-cycle rRNA approaches were used to reveal the identity of these bacteria. Based on analysis of 16S rRNA gene sequences, evolutionary trees were constructed; these placed the endosymbiont in the genus Devosia in the alpha-Proteobacteria. The validity of this finding was also shown by fluorescence in situ hybridization with a Devosia-specific oligonucleotide probe. Differences at the 16S rRNA gene level (which allowed the construction of a species-specific oligonucleotide probe) and the peculiar habitat indicate that the endosymbiont represents a novel species. As its cultivation has not been successful to date, the provisional name 'Candidatus Devosia euplotis' is proposed. The species- and group-specific probes designed in this study could represent convenient tools for the detection of 'Candidatus Devosia euplotis' and Devosia-like bacteria in the environment. (+info)
A recombinant diheme SoxAX cytochrome - implications for the relationship between EPR signals and modified heme-ligands.
(4/27)
The multiheme SoxAX proteins are notable for their unusual heme ligation (His/Cys-persulfide in the SoxA subunit) and the complexity of their EPR spectra. The diheme SoxAX protein from Starkeya novella has been expressed using Rhodobacter capsulatus as a host expression system. rSoxAX was correctly formed in the periplasm of the host and contained heme c in similar amounts as the native SoxAX. ESI-MS showed that the full length rSoxA, in spite of never having undergone catalytic turnover, existed in several forms, with the two major forms having masses of 28687 +/- 4 and 28718 +/- 4 Da. The latter form exceeds the expected mass of rSoxA by 31 +/- 4 Da, a mass close to that of a sulfur atom and indicating that a fraction of the recombinant protein contains a cysteine persulfide modification. EPR spectra of rSoxAX contained all four heme-dependent EPR signals (LS1a, LS1b, LS2, LS3) found in the native SoxAX proteins isolated from bacteria grown under sulfur chemolithotrophic conditions. Exposure of the recombinant SoxAX to different sulfur compounds lead to changes in the SoxA mass profile as determined by ESI while maintaining a fully oxidized SoxAX visible spectrum. Thiosulfate, the proposed SoxAX substrate, did not cause any mass changes while after exposure to dimethylsulfoxide a +112 +/- 4 Da form of SoxA became dominant in the mass spectrum. (+info)
Devosia soli sp. nov., isolated from greenhouse soil in Korea.
(5/27)
A Gram-negative, obligately aerobic, rod-shaped bacterium was isolated from greenhouse soil used to cultivate lettuce. The strain, GH2-10T, was characterized on the basis of phenotypic and genotypic data. 16S rRNA gene sequence analysis revealed that the isolate belonged to the genus Devosia, with highest sequence similarity (98.5%) to Devosia riboflavina IFO 13584T. Sequence similarities with other strains tested were below 97.0%. Strain GH2-10T had Q-10 as the predominant ubiquinone and C18:1omega7c and C16:0 as the major fatty acids. The G+C content of the genomic DNA was 59.5 mol%. The results of DNA-DNA hybridization experiments (47% relatedness between D. riboflavina DSM 7230T and strain GH2-10T) and physiological and biochemical tests suggested that strain GH2-10T represents a novel species of the genus Devosia, for which the name Devosia soli sp. nov. is proposed. The type strain is GH2-10T (=KACC 11509T=DSM 17780T). (+info)
Devosia insulae sp. nov., isolated from soil, and emended description of the genus Devosia.
(6/27)
A Gram-negative, motile, aerobic and oval- or rod-shaped bacterial strain, DS-56(T), which is phylogenetically closely related to the genus Devosia, was isolated from soil from Dokdo, Korea. Strain DS-56(T) grew optimally at pH 6.5-7.5 and 25 degrees C in the presence of 0.5 % (w/v) NaCl. A neighbour-joining phylogenetic tree based on 16S rRNA gene sequences showed that strain DS-56(T) joins the cluster comprising Devosia species, at a bootstrap resampling value of 100 %. The levels of 16S rRNA gene sequence similarity between strain DS-56(T) and the type strains of recognized Devosia species ranged from 95.4 to 96.4 %. Strain DS-56(T) contained Q-11 as the predominant ubiquinone, unlike Devosia species, which contain Q-10 as the predominant ubiquinone. The novel strain also contained some fatty acids, including branched and hydroxy fatty acids, that are not detected in Devosia species. The DNA G+C content of strain DS-56(T) was 66.2 mol%. On the basis of the phenotypic, chemotaxonomic and phylogenetic data, strain DS-56(T) represents a novel species of the genus Devosia, for which the name Devosia insulae sp. nov. is proposed. The type strain is DS-56(T) (=KCTC 12821(T)=DSM 17955(T)). (+info)
Devosia subaequoris sp. nov., isolated from beach sediment.
(7/27)
A novel marine bacterium was isolated from a sediment sample from Hwasun Beach in Jeju, Republic of Korea. The cells were found to be Gram-negative, aerobic, oxidase-positive, catalase-positive, motile rods. The organism required natural seawater or artificial sea salts for growth. The temperature and pH ranges for growth were 20-42 degrees C and pH 5.1-12.1, respectively. Phylogenetic analyses based on 16S rRNA gene sequences showed that the organism belonged to the order Rhizobiales and formed a robust cluster with members of the genus Devosia. Its phylogenetic neighbours were the type strains of Devosia riboflavina (96.8 % 16S rRNA gene sequence similarity), Devosia neptuniae (96.7 %), Devosia soli (96.5 %) and Devosia limi (96.2 %), 'Devosia terrae' DCY11 (96.2 %) and 'Candidatus Devosia euplotis' (96.2 %). The predominant ubiquinone was Q-10, the major fatty acids were C(18 : 1), C(18 : 0) and C(16 : 0) and the G+C content of the DNA was 59.1 mol%. On the basis of phenotypic data and the results of phylogenetic analyses, strain HST3-14(T) represents a novel species of the genus Devosia, for which the name Devosia subaequoris sp. nov. is proposed. The type strain is strain HST3-14(T) (=KCTC 12772(T) =JCM 14206(T)). (+info)
Devosia geojensis sp. nov., isolated from diesel-contaminated soil in Korea.
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