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Nitrobacter winogradskyi

ABSTRACT: Nitrite-oxidizing bacterium

PROVIDER: PRJNA35575 | ENA |

REPOSITORIES: ENA

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			Action	DRS
		Other
	SRR1302011_1.fastq.gz	Fastqsanger.gz
	SRR1302011_2.fastq.gz	Fastqsanger.gz
	SRR1302012_1.fastq.gz	Fastqsanger.gz
	SRR1302012_2.fastq.gz	Fastqsanger.gz

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Nitrobacter winogradskyi transcriptomic response to ammonia

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Nitrobacter winogradskyi transcriptomic response to ammonia

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A New Acyl-homoserine Lactone Molecule Generated by Nitrobacter winogradskyi.

Project description:It is crucial to reveal the regulatory mechanism of nitrification to understand nitrogen conversion in agricultural systems and wastewater treatment. In this study, the nwiI gene of Nitrobacter winogradskyi was confirmed to be a homoserine lactone synthase by heterologous expression in Escherichia coli that synthesized several acyl-homoserine lactone signals with 7 to 11 carbon acyl groups. A novel signal, 7, 8-trans-N-(decanoyl) homoserine lactone (C10:1-HSL), was identified in both N. winogradskyi and the recombined E. coli. Furthermore, this novel signal also triggered variances in the nitrification rate and the level of transcripts for the genes involved in the nitrification process. These results indicate that quorum sensing may have a potential role in regulating nitrogen metabolism.

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Ammonia stimulates growth and nitrite-oxidizing activity of Nitrobacter winogradskyi.

Project description:The aim of this study was to obtain a nitrite-oxidizing bacterium with high nitrite oxidation activity for controlling nitrite levels. A nitrite-oxidizing bacterium, ZS-1, was isolated from the water of a coastal Pseudosciaena crocea-rearing pond. The strain was identified as Nitrobacter winogradskyi based on the phylogenetic analyses of the 16S ribosomal ribonucleic acid gene and nxrA sequence of ZS-1. Under aerobic condition, the nitrite-oxidizing activity of ZS-1 did not change considerably in the range of pH 7-9, but was strongly inhibited by lower (pH = 6) and higher (pH = 10) pH values. The optimum temperature range is 25-32 °C. Lower temperature made the adaptive phase of ZS-1 longer but did not affect its maximum nitrite oxidization rate. The nitrite-oxidizing activity of ZS-1 started to be inhibited by ammonia and nitrate when the concentrations of ammonia and nitrate reached 25 mg L-1 and 100 mg L-1, respectively. The inhibition was stronger with higher concentration of ammonia or nitrate. The nitrite-oxidizing activity of ZS-1, however, was not inhibited by high concentration of nitrite (500 mg L-1). The nitrite-oxidizing activity of ZS-1 was increased by low ammonia concentration (1 mg L-1 to 10 mg L-1).

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Nitrospira marina

Project description:Nitrite-oxidizing bacterium

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