Urease-encoding genes in ammonia-oxidizing bacteria.

  title={Urease-encoding genes in ammonia-oxidizing bacteria.},
  author={Teresa E Koper and Amal F El-Sheikh and Jeanette M Norton and Martin G{\"u}nter Klotz},
  journal={Applied and environmental microbiology},
  volume={70 4},
Many but not all ammonia-oxidizing bacteria (AOB) produce urease (urea amidohydrolase, EC and are capable of using urea for chemolithotrophic growth. We sequenced the urease operons from two AOB, the beta-proteobacterium Nitrosospira sp. strain NpAV and the gamma-proteobacterium Nitrosococcus oceani. In both organisms, all seven urease genes were contiguous: the three structural urease genes ureABC were preceded and succeeded by the accessory genes ureD and ureEFG, respectively. Green… CONTINUE READING