Protocatechuate 4,5-dioxygenase: protocatechuate + dioxygen→4-carboxy-2-hydroxymuconate-6-semialdehyde + H+  (EC 1.13.11.8) | 
 | No genes | 
 | 4-carboxy-2-hydroxymuconate-6-semialdehyde→2-hydroxy-4-carboxymuconate semialdehyde hemiacetal (spontaneous)  | 
 | No genes | 
 | 2-hydroxy-4-carboxymuconate semialdehyde hemiacetal + NADP+→2-pyrone-4,6-dicarboxylate + NADPH + H+  (EC 1.1.1.312) | 
 | No genes | 
 2-pyrone-4,6-dicarboxylate lactonase: 2-pyrone-4,6-dicarboxylate + H2O→(1E)-4-oxobut-1-ene-1,2,4-tricarboxylate + H+  (EC 3.1.1.57) | 
 | No genes | 
 | (1E)-4-oxobut-1-ene-1,2,4-tricarboxylate→(1E,3E)-4-hydroxybuta-1,3-diene-1,2,4-tricarboxylate (spontaneous) (EC 5.3.2.8) | 
 | No genes | 
 4-oxalmesaconate hydratase (in reverse): (1E,3E)-4-hydroxybuta-1,3-diene-1,2,4-tricarboxylate + H2O→2-hydroxy-4-oxobutane-1,2,4-tricarboxylate  (EC 4.2.1.83) | 
 | No genes | 
 4-hydroxy-4-methyl-2-oxoglutarate aldolase: 2-hydroxy-4-oxobutane-1,2,4-tricarboxylate→oxaloacetate + pyruvate  (EC 4.1.3.17) | 
 | No genes | 
 Malate dehydrogenase (oxaloacetate-decarboxylating): oxaloacetate + H+→pyruvate + CO2  (EC 1.1.1.38; 1.1.1.40; 1.1.1.83; 4.1.1.112) | 
 | CSW01_02940 | 
 | CSW01_02945 | 
 | CSW01_02950 | 
 | CSW01_04095 | 
 | CSW01_04100 | 
 | CSW01_04105 | 
 | CSW01_06015 | 
 | CSW01_13540 | 
Links:
Candidate genes for each reaction are identified from best hits to MetaCyc; by matching EC numbers (which are assigned by TIGRFam, SEED, or best hits to KEGG); or by matching SEED roles to KEGG reactions to MetaCyc reactions. See the "Protein" tab of each gene for more information