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Related Experiment Videos

An analysis of simultaneous variation in protein structures

G Chelvanayagam1, A Eggenschwiler, L Knecht

  • 1Computational Biochemistry Research Group, ETH Zurich, Switzerland.

Protein Engineering
|April 1, 1997
PubMed
Summary

Amino acid substitutions in proteins often compensate for each other, especially in buried regions. This compensatory evolution, particularly for hydrogen bonding, provides insights into protein structure and evolution.

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Detecting compensatory covariation signals in protein evolution using reconstructed ancestral sequences.

Journal of molecular biology·2002

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Amino acid substitutions are fundamental to protein evolution.
  • Buried amino acid residues play critical roles in protein stability and function.
  • Understanding compensatory mutations is key to deciphering evolutionary mechanisms.

Purpose of the Study:

  • To investigate simultaneous substitutions of buried amino acid pairs during protein evolution.
  • To identify compensatory substitution patterns based on physicochemical properties and evolutionary distance.
  • To explore the relationship between residue spatial proximity and evolutionary covariation.

Main Methods:

  • Analysis of protein families with known crystal structures.
  • Examination of simultaneous substitutions in buried amino acid side chains.

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  • Statistical analysis of physicochemical covariation signals (volume, hydrogen bonding, charge).
  • Correlation of covariation strength with evolutionary distance.

    • Main Results:

    • A weak but significant signal of compensatory substitutions between spatially proximate buried amino acid pairs was detected.
    • Compensatory covariation for residue volume was most significant at very low evolutionary distances.
    • Compensatory covariation for hydrogen bonding was strongest at intermediate evolutionary distances.
    • Charge compensation covariation showed consistent strength across all examined evolutionary distances.

    Conclusions:

    • Buried amino acid pairs exhibit compensatory evolution, influenced by physicochemical properties and evolutionary time.
    • Different types of compensation (volume, hydrogen bonding, charge) manifest at distinct evolutionary scales.
    • A predictive framework for secondary structure assembly using covariation signals and structural context is proposed.