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Evolutionary changes in protein composition -- evidence for an optimal strategy.

R Coutelle, G L Hofacker, R D Levine

    Journal of Molecular Evolution
    |June 8, 1979
    PubMed
    Summary
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    Protein evolution may follow an optimal path, maximizing functional sequences generated by accepted point mutations. This study analyzes protein family information content to understand evolutionary strategies.

    Area of Science:

    • Biochemistry
    • Molecular Evolution
    • Bioinformatics

    Background:

    • Proteins within the same family share conserved structures and functions.
    • Understanding evolutionary constraints is key to predicting protein adaptation.

    Purpose of the Study:

    • To analyze the information content in protein families.
    • To investigate the nature of evolutionary changes in proteins.

    Main Methods:

    • Information theory applied to protein sequence alignments.
    • Analysis of amino acid replacement patterns within protein families.

    Main Results:

    • A constant gain in information per amino acid replacement was observed within protein families.
    • This suggests a constrained, yet efficient, evolutionary process.

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    Conclusions:

    • Protein evolution appears to follow an optimal pathway.
    • This pathway maximizes the generation of potentially functional sequences via accepted point mutations.
    • Evolutionary changes are guided by biological function constraints.