Ammonia oxidation at pH 2.5 by a new gammaproteobacterial ammonia-oxidizing bacterium.

ABSTRACT: Ammonia oxidation was considered impossible under highly acidic conditions, as the protonation of ammonia leads to decreased substrate availability and formation of toxic nitrogenous compounds. Recently, some studies described archaeal and bacterial ammonia oxidizers growing at pH as low as 4, while environmental studies observed nitrification at even lower pH values. In this work, we report on the discovery, cultivation, and physiological, genomic, and transcriptomic characterization of a novel gammaproteobacterial ammonia-oxidizing bacterium enriched via continuous bioreactor cultivation from an acidic air biofilter that was able to grow and oxidize ammonia at pH 2.5. This microorganism has a chemolithoautotrophic lifestyle, using ammonia as energy source. The observed growth rate on amm

SUBMITTER: Picone N 

PROVIDER: S-EPMC8115276 | biostudies-literature | 2021 Apr

REPOSITORIES: biostudies-literature