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Structure-function relationships in alpha-galactosidase A.

Scott C Garman1

  • 1Department of Biochemistry and Molecular Biology, University of Massachusetts, Amherst, MA 01003, USA. garman@biochem.umass.edu

Acta Paediatrica (Oslo, Norway : 1992)
|March 30, 2007
PubMed
Summary

Fabry disease is caused by mutations in the GLA gene, affecting alpha-galactosidase A protein folding. This study analyzes 331 defects, revealing protein misfolding as the primary mechanism.

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Area of Science:

  • Biochemistry
  • Genetics
  • Molecular Biology

Background:

  • Fabry disease is a lysosomal storage disorder.
  • Recent interest in molecular mechanisms driving Fabry disease.
  • Expansion of known mutations in the GLA gene, encoding alpha-galactosidase A.

Purpose of the Study:

  • To systematically survey known Fabry disease-causing mutations.
  • To analyze these mutations within the context of the alpha-galactosidase A structure.
  • To understand the atomic defects responsible for Fabry disease.

Main Methods:

  • Compiled a large database of Fabry disease-causing mutations.
  • Utilized the crystal structure of human alpha-galactosidase A.
  • Applied quantitative methods to assess mutation effects on the protein.

Main Results:

  • Analyzed 331 distinct GLA gene defects leading to non-native proteins.
  • Identified 278 missense, 49 nonsense, and 4 single amino acid deletion mutations.
  • Over half of the protein's residues showed alterations in Fabry disease patients.

Conclusions:

  • Fabry disease is primarily a protein-folding disease due to mutations disrupting the hydrophobic core.
  • Understanding alpha-galactosidase A aids in comprehending other lysosomal and protein-folding diseases.
  • Further research into alpha-galactosidase A structure-function relationships is warranted.