Biological Nitrogen Removal Database

Uncultured anaerobic ammonium-oxidizing bacterium

• Phylum : nan
• Class : nan
• Order : nan
• Family : nan
• Genus : nan

Sediments from freshwater extreme environments

Hydrazine synthase beta subunit

• Encoding Gene:hzsB
• DNA Size：333 bp
• Nucleotide FASTA sequence： Link

• UniProt I.D: W6FFZ5

• Pro_GenBank I.D： ALH45725.1

• Length：111 aa
• Protein FASTA_sequence: Link

• Reference：Zhu et al 2015
• Title：Occurrence, activity and contribution of anammox in some freshwater extreme environments
• Pubmed ID：26419325
• Pubmed link： Link

• Full research link： Link

• Abstract：Anaerobic ammonium oxidation (anammox) widely occurs in marine ecosystems, and it plays an important role in the global nitrogen cycle. But in freshwater ecosystems its occurrence, distribution and contribution, especially in extreme environments, are still not well known. In this study, anammox process was investigated in some extreme environments of freshwater ecosystems, such as those with high (above 75°C) and low (below -35°C) temperature, high (pH > 8) and low (pH < 4) pH and eutrophy (the concentration of NH4 (+) -N > 300 mg kg(-1) ). The polymerase chain reaction (PCR) screening results showed that anammox bacteria were widespread in the examined sediments from freshwater extreme environments. Quantitative PCR showed that the abundance of anammox bacteria ranged from 6.94 × 10(4) to 8.05 × 10(6) hydrazine synthase (hzsB) gene copies g(-1) dry soil. (15) N-labelled incubation experiments indicated the occurrence of anammox in all examined sediments and the potential anammox rates ranged from 0.02 to 6.24 nmol N g(-1) h(-1) , with a contribution of 3.45-58.74% of the total N2 production. In summary, these results demonstrate the occurrence of anammox in these extreme environments, inferring that anammox may harbour a wide ecological niche in the freshwater ecosystems.