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Divergent evolution of (betaalpha)8-barrel enzymes
M Henn-Sax1, B Höcker, M Wilmanns
1Institut für Biochemie, Universität zu Köln, Germany.
Biological Chemistry
|November 2, 2001
Summary
The (betaalpha)8-barrel enzyme fold likely evolved from a common ancestor through divergent evolution. Evidence suggests a
Area of Science:
- Biochemistry and Molecular Evolution
- Protein Structure and Function
Background:
- The (betaalpha)8-barrel fold is the most common enzyme structure.
- Understanding the evolutionary origins of these barrels is crucial for enzyme research.
Purpose of the Study:
- To investigate the evolutionary relationships and mechanisms behind the development of (betaalpha)8-barrel enzymes.
- To explore the potential for a common ancestor in the evolution of (betaalpha)8-barrels.
Main Methods:
- Comparative analysis of amino acid sequences and 3D structures of (betaalpha)8-barrel enzymes.
- Investigating mutational interconversion of enzymatic activities.
- Examining structural similarities between different enzyme units.
Main Results:
- A significant portion of (betaalpha)8-barrels appear to have diverged from a single ancestral protein.
- Enzymatic activities can be interconverted through mutations, supporting a common evolutionary origin.
- Structural data suggests a 'half-barrel' precursor evolved via gene duplication and fusion.
Conclusions:
- The (betaalpha)8-barrel fold likely arose from a common ancestral 'half-barrel' precursor.
- Gene duplication and fusion were key mechanisms in the evolution of these enzymes.
- Recombinantly produced 'half-barrels' confirm their stable, folded nature.