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Retention of enzyme gene duplicates by subfunctionalization
1Stockholm Bioinformatics Center, Department of Biochemistry and Biophysics, Stockholm University, 10691 Stockholm, Sweden. chefnb@sbc.su.se
International Journal of Biological Macromolecules
|November 6, 2003
Summary
The duplication-degeneration-complementation (DDC) process allows gene duplicates to divide ancestral functions, slowing pseudogene formation. This study models DDC for enzyme function, linking sequence changes to binding affinity via amino acid composition.
Area of Science:
- Evolutionary biology
- Biochemistry
- Molecular genetics
Background:
- Gene duplication is a major driver of evolutionary innovation.
- Pleiotropic genes, with multiple functions, pose unique evolutionary challenges.
- Pseudogene formation can limit the evolutionary potential of duplicated genes.
Purpose of the Study:
- To model the Duplication-Degeneration-Complementation (DDC) process for enzyme-like pleiotropic functions.
- To investigate how sequence divergence between gene duplicates influences functional partitioning.
- To establish a link between enzyme physical-chemical properties and sequence evolution.
Main Methods:
- Developed a mathematical model for DDC driven by sequence divergence.
- Incorporated an idealized sequence-function mapping based on hydrophobic-polar (HP) amino acid composition.
- Related enzyme-substrate binding affinity to the HP amino acid composition of the binding pocket.
Main Results:
- The DDC model demonstrates how gene duplicates can subfunctionalize, dividing ancestral functions.
- Sequence divergence was shown to be a key factor in driving functional partitioning.
- A clear relationship was established between enzyme binding affinity and HP amino acid composition.
Conclusions:
- DDC effectively frustrates pseudogene formation by enabling functional specialization of gene duplicates.
- The study provides a mechanistic link between sequence evolution and the physical-chemical properties of enzyme function.
- This model offers insights into the evolution of complex gene families and functional diversification.
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