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Site-specific structural constraints on protein sequence evolutionary divergence: local packing density versus

So-Wei Yeh1, Jen-Wei Liu, Sung-Huan Yu

  • 1Institute of Bioinformatics and Systems Biology, National Chiao Tung University, HsinChu, Taiwan, ROC.

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Summary

Local packing density (LPD) better predicts protein evolution rates than relative solvent accessibility (RSA). LPD may indicate how backbone flexibility influences amino acid substitution rates.

Keywords:
contact numberlocal packing densityprotein evolutionprotein structurerelative solvent accessibilitysite-specific evolutionary rateweighted contact number

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Area of Science:

  • Evolutionary biology
  • Structural bioinformatics
  • Protein science

Background:

  • Protein sequences evolve under functional and biophysical constraints.
  • Relative solvent accessibility (RSA) and local packing density (LPD) are key structural factors influencing evolution.
  • Previous studies suggested RSA is the primary driver of sequence divergence.

Purpose of the Study:

  • To compare the predictive power of RSA and LPD on protein evolutionary rates.
  • To determine the dominant structural determinant of amino acid substitution rates.

Main Methods:

  • Analysis of site-specific evolutionary rates across a diverse enzyme dataset.
  • Comparative assessment of correlation between RSA, LPD, and evolutionary rates.

Main Results:

  • Local packing density (LPD) showed a stronger correlation with evolutionary rates than RSA.
  • The independent contribution of RSA to evolutionary rate prediction was found to be minor.
  • LPD's relationship with backbone flexibility suggests a mechanism for evolutionary rate determination.

Conclusions:

  • LPD is a better predictor of protein evolutionary rates than RSA.
  • Backbone flexibility, as indicated by LPD, may be a critical factor in site-specific evolution.
  • Future research should consider LPD and backbone flexibility in evolutionary models.