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Glutamate decarboxylase: computer studies of enzyme evolution
1Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, 119991 Russia. suhareva@eimb.ru
Biochemistry. Biokhimiia
|December 4, 2002
Summary
This study analyzed 40 glutamate decarboxylases (GAD), revealing divergent evolution through sequence homology and motif analysis. Conserved residues important for coenzyme binding and substrate interaction were identified, indicating convergent evolution of catalytic functions.
Area of Science:
- Biochemistry
- Molecular Evolution
- Enzymology
Background:
- Glutamate decarboxylase (GAD) is crucial for GABA synthesis.
- Understanding GAD's evolutionary history and functional domains is vital.
Purpose of the Study:
- To analyze the primary sequence homology of 40 GADs from diverse origins.
- To elucidate the evolutionary relationships and conserved functional regions within GAD enzymes.
Main Methods:
- Multiple sequence alignment of 40 GAD subunits.
- Phylogenetic tree construction based on sequence data.
- Identification and analysis of conserved motifs and domains.
Main Results:
- Phylogenetic analysis distinguished archean, bacterial, plant, and animal GAD groups.
- Two distinct isoforms were identified within animal eukaryotes.
- Twenty homologous motifs were conserved across all studied GADs, revealing divergent evolution.
- Conserved residues critical for pyridoxal-5'-phosphate (PLP) binding and substrate interaction were identified, suggesting convergent evolution of catalytic function.
Conclusions:
- GAD enzymes exhibit both divergent and convergent evolutionary patterns.
- Conserved residues play key roles in PLP binding and substrate specificity.
- The study provides insights into the evolution of GADs and their catalytic mechanisms.