Copper requirements of a marine ammonia-oxidizing archaeon

Shady Amin and coauthors published a new study on the copper requirements of ammonia-oxidizing archaea (AOA), a major group of prokaryotes that are believed to dominate ammonia oxidation in the oceans. The few publicly available AOA genomes suggested these organisms have a Cu requirement due to the presence of a high number of Cu metalloenzymes. Indeed, this study finds that the only marine AOA available in pure culture is Cu-limited at copper concentrations that are commonly found in the marine environment.