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The evolution of SMC proteins: phylogenetic analysis and structural implications
Neville Cobbe1, Margarete M S Heck
1Wellcome Trust Centre for Cell Biology, Institute of Cell and Molecular Biology, University of Edinburgh, United Kingdom.
Molecular Biology and Evolution
|December 9, 2003
Summary
Structural Maintenance of Chromosomes (SMC) proteins are vital for DNA repair and gene regulation across all life. Our study reveals their evolutionary history, proposing gene duplication events shaped SMC protein families, with SMC5/SMC6 evolving rapidly.
Area of Science:
- Molecular Biology
- Evolutionary Biology
- Genetics
Background:
- Structural Maintenance of Chromosomes (SMC) proteins are essential molecular machines conserved across nearly all living organisms.
- These proteins are critical for fundamental cellular processes including mitotic chromosome dynamics, gene expression regulation, and DNA repair.
Purpose of the Study:
- To elucidate the phylogenetic relationships of SMC proteins from prokaryotes and eukaryotes.
- To investigate the evolutionary trajectories of different domains within eukaryotic SMC proteins.
- To propose a structural model for the SMC5/SMC6 heterodimer based on coevolutionary patterns.
Main Methods:
- Maximum-likelihood phylogenetic analyses were employed to reconstruct evolutionary relationships.
- Comparative analyses of domain coevolution were performed for eukaryotic SMC proteins.
- Available structural data was integrated to interpret observed evolutionary patterns.
Main Results:
- The six eukaryotic SMC subfamilies likely originated from ancient gene duplication events.
- Condensin family SMC proteins exhibit more rapid evolution compared to cohesins.
- SMC5 and SMC6 subfamily members show comparatively rapid evolution, suggesting potential functional redundancy in higher eukaryotes.
Conclusions:
- Gene duplication is a primary driver for the diversification of SMC protein families.
- Differential evolutionary rates among SMC subfamilies highlight functional specialization.
- A potential coevolution-based structural model for the SMC5/SMC6 heterodimer is proposed.