Structural and biochemical characterization of the biuret hydrolase (BiuH) from the cyanuric acid catabolism pathway of Rhizobium leguminasorum bv. viciae 3841
Fig 3
Reactions catalyzed by biuret amidohydrolase and homologs involved in heterocycle catabolism.
1) Ureidoacrylate peracid amidohydrolase (RutB) produces carbamate and peroxy-amino acrylate from peroxy-ureidoacrylate, which is produced by ring opening of uracil by RutA and RutF; 2) maleamate amidohydrolase (NicF) produces ammonia and maleic acid from maleamaic acid, produced by NicX and NicD from 2,5-dihydroxypyridine during nicotinic acid catabolism; and, 3) biuret amidohydrolase (BiuH) produces ammonia and allophanate from biuret during cyanuric acid catabolism.