Rhodocista pekingensis sp. nov., a cyst-forming phototrophic bacterium from a municipal wastewater treatment plant

Zhang, Demin; Yang, Huisheng; Zhang, Wei; Huang, Zhiyong; Liu, Shuang‐Jiang

doi:10.1099/ijs.0.02500-0

Cited by 72 publications

(14 citation statements)

References 12 publications

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“…The outermost clade containing all the Azospirillum species divides in two main subclades: one containing A. amazonense, A. irakense, Rhodocista pekingensis and R. centenum , and another containing the other Azospirillum species. This result is in agreement with previous studies, showing the close evolutionary relationship between A. amazonense and R. centenum [12-14], and is also supported by the greater number of A. amazonense genes (22%) with best BLAST hits (KEGG Database) to R. centenum genes.…”

Section: Resultssupporting

confidence: 93%

Genomic insights into the versatility of the plant growth-promoting bacterium Azospirillum amazonense

et al. 2011

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BackgroundThe species Azospirillum amazonense belongs to a well-known genus of plant growth-promoting bacteria. This bacterium is found in association with several crops of economic importance; however, there is a lack of information on its physiology. In this work, we present a comprehensive analysis of the genomic features of this species.ResultsGenes of A. amazonense related to nitrogen/carbon metabolism, energy production, phytohormone production, transport, quorum sensing, antibiotic resistance, chemotaxis/motility and bacteriophytochrome biosynthesis were identified. Noteworthy genes were the nitrogen fixation genes and the nitrilase gene, which could be directly implicated in plant growth promotion, and the carbon fixation genes, which had previously been poorly investigated in this genus. One important finding was that some A. amazonense genes, like the nitrogenase genes and RubisCO genes, were closer phylogenetically to Rhizobiales members than to species of its own order.ConclusionThe species A. amazonense presents a versatile repertoire of genes crucial for its plant-associated lifestyle.

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Section: Resultssupporting

confidence: 93%

Genomic insights into the versatility of the plant growth-promoting bacterium Azospirillum amazonense

et al. 2011

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“…The slightly spiroid or vibrioid shaped cells are motile by means of a single long flagellum, their intracellular photosynthetic membranes are lamellar and their in vivo absorption spectra show features almost indistinguishable from those of Rhodospirillum rubrum [2]. However, 16S rRNA analysis elucidated considerable differences between the species, hence Rhodocista was separated into a new genus [3], now consisting of three species [4,5]. R. centenaria is closely related to the plant-associated genus Azospirillum [6].…”

Section: Introductionmentioning

confidence: 99%

The photosensor protein Ppr of Rhodocista centenaria is linked to the chemotaxis signalling pathway

2010

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BackgroundRhodocista centenaria is a phototrophic α-proteobacterium exhibiting a phototactic behaviour visible as colony movement on agar plates directed to red light. As many phototrophic purple bacteria R. centenaria possesses a soluble photoactive yellow protein (Pyp). It exists as a long fusion protein, designated Ppr, consisting of three domains, the Pyp domain, a putative bilin binding domain (Bbd) and a histidine kinase domain (Pph). The Ppr protein is involved in the regulation of polyketide synthesis but it is still unclear, how this is connected to phototaxis and chemotaxis.ResultsTo elucidate the possible role of Ppr and Pph in the chemotactic network we studied the interaction with chemotactic proteins in vitro as well as in vivo. Matrix-assisted coelution experiments were performed to study the possible communication of the different putative binding partners. The kinase domain of the Ppr protein was found to interact with the chemotactic linker protein CheW. The formation of this complex was clearly ATP-dependent. Further results indicated that the Pph histidine kinase domain and CheW may form a complex with the chemotactic kinase CheAY suggesting a role of Ppr in the chemotaxis signalling pathway. In addition, when Ppr or Pph were expressed in Escherichia coli, the chemotactic response of the cells was dramatically affected.ConclusionsThe Ppr protein of Rhodocista centenaria directly interacts with the chemotactic protein CheW. This suggests a role of the Ppr protein in the regulation of the chemotactic response in addition to its role in chalcone synthesis.

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“…It shows both anaerobic phototrophic and aerobic chemoheterotrophic growth and uses H 2 as an electron donor [33]. Downloaded by [University of Sherbrooke] at 03:17 13 April 2015 Environmental Technology…”

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confidence: 99%

Biological sulphide removal from anaerobically treated domestic sewage: reactor performance and microbial community dynamics

Garcia

Diniz

Bicalho

et al. 2015

Environmental Technology

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We developed a biological sulphide oxidation system and evaluated two reactors (shaped similar to the settler compartment of an up-flow anaerobic sludge blanket [UASB] reactor) with different support materials for biomass retention: polypropylene rings and polyurethane foam. The start-up reaction was achieved using microorganisms naturally occurring on the open surface of UASB reactors treating domestic wastewater. Sulphide removal efficiencies of 65% and 90% were achieved with hydraulic retention times (HRTs) of 24 and 12 h, respectively, in both reactors. However, a higher amount of elemental sulphur was formed and accumulated in the biomass from reactor 1 (20 mg S(0) g(-1) VTS) than in that from reactor 2 (2.9 mg S(0) g(-1) VTS) with an HRT of 24 h. Denaturing gradient gel electrophoresis (DGGE) results revealed that the the pink and green biomass that developed in both reactors comprised a diverse bacterial community and had sequences related to phototrophic green and purple-sulphur bacteria such as Chlorobium sp., Chloronema giganteum, and Chromatiaceae. DGGE band patterns also demonstrated that bacterial community was dynamic over time within the same reactor and that different support materials selected for distinct bacterial communities. Taken together, these results indicated that sulphide concentrations of 1-6 mg L(-1) could be efficiently removed from the effluent of a pilot-scale UASB reactor in two sulphide biological oxidation reactors at HRTs of 12 and 24 h, showing the potential for sulphur recovery from anaerobically treated domestic wastewater.

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Rhodocista pekingensis sp. nov., a cyst-forming phototrophic bacterium from a municipal wastewater treatment plant

Cited by 72 publications

References 12 publications

Genomic insights into the versatility of the plant growth-promoting bacterium Azospirillum amazonense

Genomic insights into the versatility of the plant growth-promoting bacterium Azospirillum amazonense

The photosensor protein Ppr of Rhodocista centenaria is linked to the chemotaxis signalling pathway

Biological sulphide removal from anaerobically treated domestic sewage: reactor performance and microbial community dynamics

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