4.8 Article

Protein Biophysics Explains Why Highly Abundant Proteins Evolve Slowly

Journal

CELL REPORTS
Volume 2, Issue 2, Pages 249-256

Publisher

CELL PRESS
DOI: 10.1016/j.celrep.2012.06.022

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Funding

  1. NIH [GM068670]

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The consistent observation across all kingdoms of life that highly abundant proteins evolve slowly demonstrates that cellular abundance is a key determinant of protein evolutionary rate. However, other empirical findings, such as the broad distribution of evolutionary rates, suggest that additional variables determine the rate of protein evolution. Here, we report that under the global selection against the cytotoxic effects of misfolded proteins, folding stability (Delta G), simultaneous with abundance, is a causal variable of evolutionary rate. Using both theoretical analysis and multiscale simulations, we demonstrate that the anticorrelation between the premutation Delta G and the arising mutational effect (Delta Delta G), purely biophysical in origin, is a necessary requirement for abundance-evolutionary rate covariation. Additionally, we predict and demonstrate in bacteria that the strength of abundance-evolutionary rate correlation depends on the divergence time separating reference genomes. Altogether, these results highlight the intrinsic role of protein biophysics in the emerging universal patterns of molecular evolution.

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