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Water, protein folding, and the genetic code.

R V Wolfenden, P M Cullis, C C Southgate

    Science (New York, N.Y.)
    |November 2, 1979
    PubMed
    Summary

    Amino acid side chains

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Genetics

    Background:

    • Protein structure is determined by amino acid sequences.
    • Amino acid properties influence protein folding and function.
    • The genetic code dictates protein synthesis.

    Purpose of the Study:

    • To investigate the relationship between amino acid side chain affinities for water and their distribution in proteins.
    • To explore the link between these affinities and the bias observed in the genetic code.

    Main Methods:

    • Computational analysis of amino acid side chain hydrophobicity.
    • Statistical analysis of amino acid distributions in protein databases.
    • Correlation analysis with genetic code biases.

    Main Results:

    • A strong correlation was found between the absolute affinities of amino acid side chains for water and their observed distribution in protein structures.
    • This correlation extends to the bias in the genetic code, suggesting a co-evolutionary relationship.
    • Hydrophilicity is a key determinant of protein surface-area exposure.

    Conclusions:

    • The fundamental physicochemical properties of amino acids, specifically their interaction with water, are major drivers of protein structure and evolution.
    • The genetic code appears to be biased to favor amino acids with properties that promote stable and functional protein structures.
    • Understanding these principles is crucial for protein design and synthetic biology.

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