Ammonia Oxidation by the Arctic Terrestrial Thaumarchaeote Candidatus Nitrosocosmicus arcticus Is Stimulated by Increasing Temperatures

Frontiers in Microbiology
Ricardo J Eloy AlvesChrista Schleper

Abstract

Climate change is causing arctic regions to warm disproportionally faster than those at lower latitudes, leading to alterations in carbon and nitrogen cycling, and potentially higher greenhouse gas emissions. It is thus increasingly important to better characterize the microorganisms driving arctic biogeochemical processes and their potential responses to changing conditions. Here, we describe a novel thaumarchaeon enriched from an arctic soil, Candidatus Nitrosocosmicus arcticus strain Kfb, which has been maintained for seven years in stable laboratory enrichment cultures as an aerobic ammonia oxidizer, with ammonium or urea as substrates. Genomic analyses show that this organism harbors all genes involved in ammonia oxidation and in carbon fixation via the 3-hydroxypropionate/4-hydroxybutyrate cycle, characteristic of all AOA, as well as the capability for urea utilization and potentially also for heterotrophic metabolism, similar to other AOA. Ca. N. arcticus oxidizes ammonia optimally between 20 and 28°C, well above average temperatures in its native high arctic environment (-13-4°C). Ammonia oxidation rates were nevertheless much lower than those of most cultivated mesophilic AOA (20-45°C). Intriguingly, we repeatedly obse...Continue Reading

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Citations

Mar 19, 2020·Water Environment Research : a Research Publication of the Water Environment Federation·Meiling YiShiyuan Ding
Nov 1, 2020·Nature Communications·Paul O SheridanCécile Gubry-Rangin
Feb 25, 2021·The Journal of Microbiology·Jong-Geol KimSung-Keun Rhee
Apr 22, 2021·International Journal of Systematic and Evolutionary Microbiology·Aharon Oren, George M Garrity
Apr 11, 2021·Applied and Environmental Microbiology·Xinli WangXuan Zhang

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Datasets Mentioned

BETA
PRJNA505990

Methods Mentioned

BETA
PCR
scanning electron microscopy
Fluorescence
Assay
electrophoresis
Amplicon Sequencing
Chip
Illumina sequencing
whole-genome shotgun sequencing
glycosylation

Key Resources (RRID) Mentioned

SCR_005454
SCR_011841
SCR_000131
SCR_005488
SCR_002105

Software Mentioned

Hifix
RNAmmer
SILVA
VSEARCH
BLASTP
NextGenMap
MEGAN
CUTADAPT
SAMtools
Jspecies

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