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Structural basis of hereditary coproporphyria.

Dong-Sun Lee1, Eva Flachsová, Michaela Bodnárová

  • 1Department of Biochemistry and Molecular Biology, University of Texas Medical School, Houston, TX 77030, USA.

Proceedings of the National Academy of Sciences of the United States of America
|September 24, 2005
PubMed
Summary

Hereditary coproporphyria, caused by low coproporphyrinogen oxidase (CPO) activity, is better understood through its crystal structure. This reveals CPO

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Genetics

Background:

  • Hereditary coproporphyria is an autosomal dominant disorder linked to reduced coproporphyrinogen oxidase (CPO) activity.
  • The catalytic mechanism of CPO, a key enzyme in heme biosynthesis, is poorly understood, particularly its metal- and cofactor-independent nature.

Purpose of the Study:

  • To elucidate the structural basis of coproporphyrinogen oxidase (CPO) function and its role in hereditary coproporphyria.
  • To understand the molecular mechanisms underlying CPO catalysis and the impact of disease-associated mutations.

Main Methods:

  • X-ray crystallography was used to determine the high-resolution (1.58-A) crystal structure of human CPO.
  • Biochemical assays and structural analysis were employed to investigate enzyme activity, dimerization, and the effects of specific mutations.

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Main Results:

  • The crystal structure reveals a unique tertiary topology and the biologically active dimeric form of CPO.
  • Citrate was identified at the active site, enabling the assignment of key catalytic residues involved in substrate recognition and decarboxylation.
  • Specific mutations were structurally linked to impaired dimerization and substrate retention, explaining reduced enzyme activity in hereditary coproporphyria.

Conclusions:

  • The determined CPO structure provides critical insights into its novel catalytic mechanism, likely involving oxygen as an electron acceptor.
  • Understanding the structural basis of CPO function and mutations clarifies the molecular pathology of hereditary coproporphyria and related disorders.