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Fabry disease: correlation between structural changes in alpha-galactosidase, and clinical and biochemical phenotypes
Fumiko Matsuzawa1, Sei-ichi Aikawa, Hirofumi Doi
1Celestar Lexico-Sciences Inc., MTG-17, 1-3 Nakase, Chiba 261-8501, Japan.
Human Genetics
|June 1, 2005
Summary
Structural analysis of alpha-galactosidase mutations in Fabry disease reveals distinct patterns for classic and variant phenotypes. This finding aids in predicting disease progression and guiding personalized therapeutic strategies for Fabry patients.
Area of Science:
- Biochemistry and Structural Biology
- Genetics and Molecular Medicine
- Enzyme kinetics and protein stability
Background:
- Fabry disease presents with classic and variant phenotypes, necessitating tailored treatments like enzyme replacement therapy or galactose infusion.
- Predicting Fabry disease phenotype and optimal therapeutic approach solely from genetic information remains challenging.
- Understanding the structural impact of alpha-galactosidase mutations is crucial for advancing Fabry disease management.
Purpose of the Study:
- To perform a novel structural analysis of alpha-galactosidase mutant models to correlate structural changes with Fabry disease phenotypes.
- To evaluate the influence of missense mutations on enzyme structure and stability.
- To determine the potential of galactose as a stabilizing agent for mutant alpha-galactosidases.
Main Methods:
- Construction of structural models for 161 missense mutations in alpha-galactosidase (147 classic, 14 variant).
- Calculation of affected atoms to quantify the structural impact of each amino acid replacement.
- Biochemical characterization and color imaging of 11 selected mutants to visualize structural changes.
Main Results:
- Variant Fabry mutations typically cause minor structural changes, often affecting the main chain less than three atoms, leading to enzyme destabilization.
- Galactose demonstrated a stabilizing effect on enzymes with variant mutations.
- Classic Fabry mutations generally result in larger structural alterations or affect functionally critical regions, impacting three or more main-chain atoms, leading to dysfunctional and unstable enzymes.
Conclusions:
- Structural investigation provides a valuable tool for understanding the molecular basis of Fabry disease phenotypes.
- The study demonstrates a clear correlation between the extent of structural changes in alpha-galactosidase and clinical/biochemical phenotypes.
- These findings support the development of more precise diagnostic and therapeutic strategies for Fabry disease based on structural insights.