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Uroporphyrinogen-III synthase (HemD) catalyzes the asymmetrical cyclization of tetrapyrrole (linear) to uroporphyrinogen-III, the fourth step in the biosynthesis of heme. This ubiquitous enzyme is present in eukaryotes, bacteria and archaea. Mutations in the human uroporphyrinogen-III synthase gene cause congenital erythropoietic porphyria, 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.",