Coupling between Protein Stability and Catalytic Activity Determines Pathogenicity of G6PD Variants

Area of Science:

• Biochemistry
• Genetics
• Molecular Biology

Background:

• Glucose-6-phosphate dehydrogenase (G6PD) deficiency is a common inherited enzymopathy affecting 7% of the global population.
• Over 160 identified amino acid variants in G6PD cause this deficiency, leading to a wide spectrum of clinical presentations.
• The diverse phenotypes are attributed to variant distribution and complex biochemical effects.

Purpose of the Study:

• To investigate the relationship between G6PD variants and their clinical phenotypes using bioinformatic and biochemical approaches.
• To predict the molecular phenotypes of previously uncharacterized G6PD variants.
• To elucidate the biochemical factors driving G6PD deficiency pathogenicity.

Main Methods:

• Bioinformatic analysis of structural information and statistical analysis of known G6PD variants.
• Biochemical characterization of G6PD variants.
• Multidimensional analysis of biochemical data to correlate variant properties with clinical outcomes.

Main Results:

• Predicted molecular phenotypes for five uncharacterized G6PD variants.
• Demonstrated that clinical phenotypes are primarily determined by a trade-off between G6PD protein stability and catalytic activity.
• Identified key biochemical determinants of G6PD variant pathogenicity.

Conclusions:

• Expands understanding of the biochemical basis of G6PD variant pathogenicity.
• Highlights the critical role of the stability-activity balance in G6PD deficiency.
• Suggests potential therapeutic strategies targeting G6PD structural features for deficiency correction.