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Quantifying evolutionary importance of protein sites: A Tale of two measures


Autoři: Avital Sharir-Ivry aff001;  Yu Xia aff001
Působiště autorů: Department of Bioengineering, McGill University, Montreal, Quebec, Canada aff001
Vyšlo v časopise: Quantifying evolutionary importance of protein sites: A Tale of two measures. PLoS Genet 17(4): e1009476. doi:10.1371/journal.pgen.1009476
Kategorie: Research Article
doi: https://doi.org/10.1371/journal.pgen.1009476

Souhrn

A key challenge in evolutionary biology is the accurate quantification of selective pressure on proteins and other biological macromolecules at single-site resolution. The evolutionary importance of a protein site under purifying selection is typically measured by the degree of conservation of the protein site itself. A possible alternative measure is the strength of the site-induced conservation gradient in the rest of the protein structure. However, the quantitative relationship between these two measures remains unknown. Here, we show that despite major differences, there is a strong linear relationship between the two measures such that more conserved protein sites also induce stronger conservation gradient in the rest of the protein. This linear relationship is universal as it holds for different types of proteins and functional sites in proteins. Our results show that the strong selective pressure acting on the functional site in general percolates through the rest of the protein via residue-residue contacts. Surprisingly however, catalytic sites in enzymes are the principal exception to this rule. Catalytic sites induce significantly stronger conservation gradients in the rest of the protein than expected from the degree of conservation of the site alone. The unique requirement for the active site to selectively stabilize the transition state of the catalyzed chemical reaction imposes additional selective constraints on the rest of the enzyme.

Klíčová slova:

Enzymes – Evolutionary rate – Fungal evolution – Molecular evolution – Protein-protein interactions – Saccharomyces cerevisiae – Schizosaccharomyces pombe – Yeast


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