Extended Data Table 1 Presence of cyanase, nitrite/nitrate transporters and enzymes related to urea metabolism in ammonia- and nitrite-oxidizing microorganisms with fully a sequenced genome.

From: Cyanate as an energy source for nitrifiers

  1. *Formate-nitrite transporter family: encoded by focA/nirC, has been postulated to transport cyanate18.
  2. †Nitrate/nitrite transporter family: encoded by nark, might also transport cyanate due to its chemical similarity to nitrite.
  3. ‡ABC transporter of nitrate/sulfonate/bicarbonate: this transporter family has been shown to transport cyanate as well20.
  4. §Urea transporter: ABC transporter, or urea channel.
  5. Urea produced internally by the enzymes agmatine amidinohydrolase or arginine amidinohydrolase.
  6. ¶Urea consumed internally by the enzymes urease or urea carboxylase and allophanate hydrolase.
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