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2q6z
From Proteopedia
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[[Image:2q6z.gif|left|200px]] | [[Image:2q6z.gif|left|200px]] | ||
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'''Uroporphyrinogen Decarboxylase G168R single mutant apo-enzyme''' | '''Uroporphyrinogen Decarboxylase G168R single mutant apo-enzyme''' | ||
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[[Category: Stadtmueller, B M.]] | [[Category: Stadtmueller, B M.]] | ||
[[Category: Whitby, F G.]] | [[Category: Whitby, F G.]] | ||
| - | [[Category: | + | [[Category: Uroporphyrinogen decarboxylase enzyme urod g168r coproporphyrinogen]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 14:27:37 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 11:27, 4 May 2008
Uroporphyrinogen Decarboxylase G168R single mutant apo-enzyme
Contents |
Overview
Hepatoerythropoietic porphyria (HEP) is a rare form of porphyria in humans. The disorder is caused by homozygosity or compound heterozygosity for mutations of the uroporphyrinogen decarboxylase (URO-D) gene. Subnormal URO-D activity results in accumulation of uroporphyrin in the liver, which ultimately mediates the photosensitivity that clinically characterizes HEP. Two previously undescribed URO-D mutations found in a 2-year-old Caucasian boy with HEP, a maternal nonsense mutation (Gln71Stop), and a paternal missense mutation (Gly168Arg) are reported here. Recombinant Gly168Arg URO-D retained 65% of wild-type URO-D activity and studies in Epstein-Barr Virus (EBV)-transformed lymphoblasts indicated that protein levels are reduced, suggesting that the mutant protein might be subjected to accelerated turnover. The crystal structure of Gly168Arg was determined both as the apo-enzyme and with the reaction product bound. These studies revealed little distortion of the active site, but a loop containing residues 167-172 was displaced, possibly indicating small changes in the catalytic geometry or in substrate binding or increased accessibility to a cellular proteolytic pathway. A second pregnancy occurred in this family, and in utero genotyping revealed a fetus heterozygous for the maternal nonsense mutation (URO-D genotype WT/Gln71Stop). A healthy infant was born with no clinical evidence of porphyria.
Disease
Known disease associated with this structure: Porphyria cutanea tarda OMIM:[176100], Porphyria, hepatoerythropoietic OMIM:[176100]
About this Structure
2Q6Z is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
Two novel uroporphyrinogen decarboxylase (URO-D) mutations causing hepatoerythropoietic porphyria (HEP)., Phillips JD, Whitby FG, Stadtmueller BM, Edwards CQ, Hill CP, Kushner JP, Transl Res. 2007 Feb;149(2):85-91. PMID:17240319 Page seeded by OCA on Sun May 4 14:27:37 2008
