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Simultaneus presence of bacteriochlorophyll and xanthorhodopsin genes in freshwater bacterium Sphingomonas sp. AAP5

ABSTRACT: Simultaneus presence of bacteriochlorophyll and xanthorhodopsin genes in freshwater bacterium Sphingomonas sp. AAP5

PROVIDER: PRJNA613036 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR11313203.fastq.gz	Fastqsanger.gz
	SRR11313204.fastq.gz	Fastqsanger.gz
	SRR11313205.fastq.gz	Fastqsanger.gz
	SRR11313206.fastq.gz	Fastqsanger.gz
	SRR11313207.fastq.gz	Fastqsanger.gz

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Psychrotolerant bacterium Sphingomonas glacialis AAP5 harvests light energy using both proton-pumping xanthorhodopsins and bacteriochlorophyll-based reaction centers

Project description:Bacterium Sphingomonas glacialis AAP5 isolated from the alpine lake Gossenköllesee contains genes for anoxygenic phototrophy as well as proton-pumping xanthorhodopsin. Here we show that AAP5 expresses xanthorhodopsin when illuminated at temperatures below 16°C. In contrast bacteriochlorophyll-containing reaction centers are expressed between 4 and 22°C in the dark. Thus, cells grown at lower temperature under natural light-dark cycle produced both photosystems. The purified xanthorhodopsin contains carotenoid nostoxanthin serving as an auxiliary antenna and performs the standard photocycle. The xanthorhodopsin-containing cells reduced upon illumination their respiration, increased their ATP synthesis and produced more biomass. This documents that the harvested light energy was utilized in the metabolism, which can represent a competitive advance under carbon-limiting conditions. The presence of Sphingomonas bacteria with dual phototrophy was verified in the metagenomes collected from lake Gossenköllesee. This unique trait may represent a metabolic advantage in alpine lakes where photoheterotrophic organisms facelimited organic substrates, low temperature, and extreme changes in irradiance.

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Sphingomonas sp. AAP5

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Simultaneus presence of bacteriochlorophyll and xanthorhodopsin genes in freshwater bacterium Sphingomonas sp. AAP5

Project description:This SuperSeries is composed of the SubSeries listed below.

2020-06-01 | GSE147102 | GEO

Psychrotolerant bacterium Sphingomonas glacialis AAP5 harvests light energy using both proton-pumping xanthorhodopsins and bacteriochlorophyll-based reaction centers

Project description:Psychrotolerant bacterium Sphingomonas glacialis AAP5 harvests light energy using both proton-pumping xanthorhodopsins and bacteriochlorophyll-based reaction centers

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Characterization of the Aerobic Anoxygenic Phototrophic Bacterium Sphingomonas sp. AAP5.

Project description:An aerobic, yellow-pigmented, bacteriochlorophyll a-producing strain, designated AAP5 (=DSM 111157=CCUG 74776), was isolated from the alpine lake Gossenköllesee located in the Tyrolean Alps, Austria. Here, we report its description and polyphasic characterization. Phylogenetic analysis of the 16S rRNA gene showed that strain AAP5 belongs to the bacterial genus Sphingomonas and has the highest pairwise 16S rRNA gene sequence similarity with Sphingomonas glacialis (98.3%), Sphingomonas psychrolutea (96.8%), and Sphingomonas melonis (96.5%). Its genomic DNA G + C content is 65.9%. Further, in silico DNA-DNA hybridization and calculation of the average nucleotide identity speaks for the close phylogenetic relationship of AAP5 and Sphingomonas glacialis. The high percentage (76.2%) of shared orthologous gene clusters between strain AAP5 and Sphingomonas paucimobilis NCTC 11030T, the type species of the genus, supports the classification of the two strains into the same genus. Strain AAP5 was found to contain C18:1ω7c (64.6%) as a predominant fatty acid (>10%) and the polar lipid profile contained phosphatidylglycerol, diphosphatidylglycerol, phosphatidylethanolamine, sphingoglycolipid, six unidentified glycolipids, one unidentified phospholipid, and two unidentified lipids. The main respiratory quinone was ubiquinone-10. Strain AAP5 is a facultative photoheterotroph containing type-2 photosynthetic reaction centers and, in addition, contains a xathorhodopsin gene. No CO2-fixation pathways were found.

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Expression analysis of motile strain of Sphingomonas sp. A1

Project description:Investigation of whole genome gene expression level in motile strain of Sphingomonas. sp A1 All flagellar genes in motile strain of Sphingomonas. sp A1 are highly transcribed. A two chip study using total RNA recovered from wild-type and motile strains of Sphingomonas. sp A1 grown in 0.5% alginate medium.

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