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Uroporphyrinogen-III synthase HemD This family consists of uroporphyrinogen-III synthase HemD EC:4.2.1.75 also known as Hydroxymethylbilane hydrolyase (cyclizing) from eukaryotes, bacteria and archaea. This enzyme catalyzes the reaction: Hydroxymethylbilane <=> uroporphyrinogen-III + H(2)O. Some members of this family are multi-functional proteins possessing other enzyme activities related to porphyrin biosynthesis, such as Swiss:Q59294 with pfam00590, however the aligned region corresponds with the uroporphyrinogen-III synthase EC:4.2.1.75 activity only. Uroporphyrinogen-III synthase is the fourth enzyme in the heme pathway. Mutant forms of the Uroporphyrinogen-III synthase gene cause congenital erythropoietic porphyria in humans a recessive inborn error of metabolism also known as Gunther disease.
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Jiyao W et al.(2023). "The conserved domain database in 2023.",