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Evolutionary conservation of protein backbone flexibility.

Sandra Maguid1, Sebastián Fernández-Alberti, Gustavo Parisi

  • 1Centro de Estudios e Investigaciones, Universidad Nacional de Quilmes, Saenz Peña 180, 1876, Bernal, Buenos Aires, Argentina.

Journal of Molecular Evolution
|October 6, 2006
PubMed
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Protein dynamics, crucial for biological function, are evolutionarily conserved. This study shows C(alpha) flexibility profiles are maintained in homologous proteins, even with low sequence similarity, highlighting conserved protein dynamics.

Area of Science:

  • Biophysics
  • Evolutionary Biology
  • Structural Biology

Background:

  • Protein dynamics are vital for biological functions.
  • Evolutionary constraints dictate that functionally important protein properties diverge slowly.
  • The evolutionary trajectory of protein dynamics remains largely unexplored compared to protein structure.

Purpose of the Study:

  • To systematically investigate the evolutionary divergence of protein backbone dynamics.
  • To assess the conservation of protein flexibility across homologous protein families and superfamilies.
  • To explore correlations between the divergence of flexibility, sequence, and structure.

Main Methods:

  • Analysis of C(alpha) flexibility (B-factor) profiles from X-ray diffraction data.

Related Experiment Videos

  • Comparison of flexibility profiles across a large dataset of homologous proteins.
  • Classification of proteins into families and superfamilies to track evolutionary divergence.

    • Main Results:

    • C(alpha) flexibility profiles exhibit slow divergence, indicating evolutionary conservation.
    • Flexibility profiles are conserved within protein families and superfamilies, even with minimal sequence similarity.
    • Correlations between the divergence of flexibility, sequence, and structure were analyzed.

    Conclusions:

    • Protein backbone dynamics, as measured by C(alpha) flexibility, are evolutionarily conserved.
    • This conservation persists across significant evolutionary distances, suggesting functional importance.
    • Flexibility divergence patterns offer insights into the interplay between protein dynamics, sequence, and structure evolution.