Transforms N-isopropylammelide to cyanuric acid and isopropylamine. H(+) + H2O + N-isopropylammelide = cyanurate + isopropylamine Binds 1 Zn(2+) ion per subunit. Inhibited by N-ethylammeline, N-hydroxyethylammeline, N-isopropylammeline, ammeline and 2-amino-4hydroxy-1,3,5-s-triazine. kcat is 178 sec(-1) for N-methylammelide. kcat is 209 sec(-1) for N-ethylammelide. kcat is 80.6 sec(-1) for N-hydroxyethylammelide. kcat is 13.3 sec(-1) for N-isopropylammelide. kcat is 98.2 sec(-1) for N-cyclopropylammelide. kcat is 0.07 sec(-1) for N-t-butylammelide. kcat is 10.7 sec(-1) for N-dimethylammelide. kcat is 1.65 sec(-1) for ammelide. Optimum pH is 7.25. Xenobiotic degradation; atrazine degradation; cyanurate from atrazine: step 3/3. Homotetramer. Belongs to the metallo-dependent hydrolases superfamily. N-acyl-D-amino-acid deacylase family.