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Classifying glycerol dehydratase by its functional residues and purifying selection in its evolution
Andres Julian Gutierrez Escobar1, Dolly Montoya Castaño
1Universidad Nacional de Colombia, Bioprocesses and Bioprospecting Research Group, Instituto de Biotecnología Bogotá, Colombia.
Bioinformation
|March 3, 2011
Summary
Glycerol dehydratase (GD) enzymes, crucial for 1,3-propanediol production, were analyzed. Evolutionary history revealed distinct vitamin B12-dependent and independent groups, with key functional residues identified for divergence.
Area of Science:
- Biochemistry
- Enzymology
- Evolutionary Biology
Background:
- Glycerol dehydratase (GD) is essential for converting glycerol to 1,3-propanediol via 3-hydroxypropanaldehyde.
- Two distinct classes of GD exist: vitamin B12-dependent and B12-independent.
- Understanding GD's evolutionary divergence is key for protein engineering.
Purpose of the Study:
- To describe the evolutionary history of glycerol dehydratase.
- To identify functional residues responsible for the divergence between GD classes.
- To provide a foundation for rational mutagenesis studies.
Main Methods:
- Phylogenetic analysis of GD protein sequences.
- Statistical robustness assessment of phylogenetic tree topology.
- Identification of conserved 'hot-spot' residues driving protein divergence.
Main Results:
- A robust phylogenetic tree clearly separated vitamin B12-dependent and independent GD clades.
- Strong purifying selection was observed acting on GD proteins.
- Specific ancient residues were identified as critical for divergence within each clade.
Conclusions:
- The evolutionary history of GD proteins is well-defined.
- Key residues driving functional divergence have been pinpointed.
- This study facilitates future protein engineering efforts for improved GD function.
