Tautomerase that converts enol-oxaloacetate, a strong inhibitor of succinate dehydrogenase, to the physiological keto form of oxaloacetate (PubMed:38287013). It is thereby required to maximize aerobic respiration efficiency by preventing succinate dehydrogenase inhibition (PubMed:38287013). . This is the function of Ensembl gene identifier ENSG00000115042 (FAHD2A, fumarylacetoacetate hydrolase domain containing 2A).