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Aquatic metagenome

ABSTRACT: ammonia-oxidizing microorganisms affected by organ carbon compounds

PROVIDER: PRJNA314728 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR3340912_1.fastq.gz	Fastqsanger.gz
	SRR3340912_2.fastq.gz	Fastqsanger.gz
	SRR3340913_1.fastq.gz	Fastqsanger.gz
	SRR3340913_2.fastq.gz	Fastqsanger.gz
	SRR3340914_1.fastq.gz	Fastqsanger.gz

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Stress response of a marine ammonia-oxidizing archaeon informs physiological status of environmental populations

Project description:High representation by ammonia-oxidizing archaea (AOA) in marine systems is consistent with their high affinity for ammonia, efficient carbon fixation, and copper (Cu)-centric respiratory system. However, little is known about their response to nutrient stress. We therefore used global transcriptional and proteomic analyses to characterize the response of a model AOA, Nitrosopumilus maritimus SCM1, to ammonia starvation, Cu limitation, and Cu excess. Most predicted protein-coding genes were transcribed in exponentially growing cells, and of ~74% detected in the proteome, ~6% were modified by N-terminal acetylation. The general response to ammonia starvation and Cu-stress was down-regulation of genes for energy generation and biosynthesis. Cells rapidly depleted transcripts for the A and B subunits of ammonia monooxygenase (AMO) in response to ammonia starvation, yet retained relatively high levels of transcripts for the C subunit. Thus, similar to ammonia-oxidizing bacteria, selective retention of amoC transcripts during starvation appears important for subsequent recovery, and also suggests that AMO subunit transcript ratios could be used to assess the physiological status of marine populations. Unexpectedly, cobalamin biosynthesis was upregulated in response to both ammonia starvation and Cu-stress, indicating the importance of this cofactor in retaining functional integrity during times of stress.

2017-10-27 | PXD007728 | Pride

Project description:The Role of Ammonia Oxidizing Microorganisms in Attenuating Trace Organic Compounds in Water Reuse Biofiltration Systems

| PRJNA858847 | ENA

Acidification alters the composition of ammonia oxidizing microbial assemblages in marine mesocosms

Project description:Increasing atmospheric CO2 concentrations are causing decreased pH over vast expanses of the ocean. This decreasing pH may alter biogeochemical cycling of carbon and nitrogen via the microbial process of nitrification, a key process that couples these cycles in the ocean, but which is often sensitive to acidic conditions. Recent reports indicate a decrease in oceanic nitrification rates under experimentally lowered pH. How composition and abundance of ammonia oxidizing bacteria (AOB) and archaea (AOA) assemblages respond to decreasing oceanic pH, however, is unknown. We sampled microbes from two different acidification experiments and used a combination of qPCR and functional gene microarrays for the ammonia monooxygenase gene (amoA) to assess how acidification alters the structure of ammonia oxidizer assemblages. We show that despite widely different experimental conditions, acidification consistently altered the community composition of AOB by increasing the relative abundance of taxa related to the Nitrosomonas ureae clade. In one experiment this increase was sufficient to cause an increase in the overall abundance of AOB. There were no systematic shifts in the community structure or abundance of AOA in either experiment. These different responses to acidification underscore the important role of microbial community structure in the resiliency of marine ecosystems. SUBMITTER_CITATION: Title: Acidification alters the composition of ammonia oxidizing microbial assemblages in marine mesocosms Journal: Marine Ecology Progress Series Issue: 492 Pages: 1-8 DOI: 10.3354/meps 10526 Authors: Jennifer L Bowen Patrick J Kearns Michael Holcomb Bess B Ward

2013-08-27 | GSE49956 | GEO

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