4-oxalomesaconate tautomerase (, GalD) is an enzyme with systematic name 4-oxalomesaconate keto---enol-isomerase. This enzyme catalyses the following chemical reaction
(1E)-4-oxobut-1-ene-1,2,4-tricarboxylate (1E,3E)-4-hydroxybuta-1,3-diene-1,2,4-tricarboxylate
This enzyme has been characterized from the bacterium Pseudomonas putida.
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