1uro
From Proteopedia
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UROPORPHYRINOGEN DECARBOXYLASE
Contents |
Overview
Uroporphyrinogen decarboxylase (URO-D) catalyzes the fifth step in the, heme biosynthetic pathway, converting uroporphyrinogen to, coproporphyrinogen by decarboxylating the four acetate side chains of the, substrate. This activity is essential in all organisms, and subnormal, activity of URO-D leads to the most common form of porphyria in humans, porphyria cutanea tarda (PCT). We have determined the crystal structure of, recombinant human URO-D at 1.60 A resolution. The 40.8 kDa protein is, comprised of a single domain containing a (beta/alpha)8-barrel with a deep, active site cleft formed by loops at the C-terminal ends of the barrel, strands. Many conserved residues cluster at this cleft, including the, invariant side chains of Arg37, Arg41 and His339, which probably function, in substrate binding, and Asp86, Tyr164 and Ser219, which may function in, either binding or catalysis. URO-D is a dimer in solution (Kd = 0.1, microM), and this dimer also appears to be formed in the crystal. Assembly, of the dimer juxtaposes the active site clefts of the monomers, suggesting, a functionally important interaction between the catalytic centers.
Disease
Known diseases associated with this structure: Porphyria cutanea tarda OMIM:[176100], Porphyria, hepatoerythropoietic OMIM:[176100]
About this Structure
1URO is a Single protein structure of sequence from Homo sapiens with BME as ligand. Active as Uroporphyrinogen decarboxylase, with EC number 4.1.1.37 Full crystallographic information is available from OCA.
Reference
Crystal structure of human uroporphyrinogen decarboxylase., Whitby FG, Phillips JD, Kushner JP, Hill CP, EMBO J. 1998 May 1;17(9):2463-71. PMID:9564029
Page seeded by OCA on Mon Nov 12 19:37:58 2007
