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Compositional nonrandomness: a quantitatively conserved evolutionary invariant.

R Halmquist, H Moise

    Journal of Molecular Evolution
    |October 3, 1975
    PubMed
    Summary
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    The probability of a protein's amino acid composition deviating from standard genetic code frequencies is constant across all protein families. This finding holds true regardless of protein length, function, or evolutionary origin.

    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Genetics

    Background:

    • The genetic code dictates the translation of DNA into amino acid sequences.
    • Variations in amino acid composition can arise from various biological processes.
    • Understanding these variations is crucial for protein function and evolution.

    Purpose of the Study:

    • To investigate the a priori probability of amino acid composition deviations in proteins.
    • To determine if this probability is influenced by protein characteristics such as length, function, or origin.

    Main Methods:

    • Statistical analysis of protein sequence databases.
    • Comparison of observed amino acid frequencies against theoretical genetic code frequencies.
    • Development of a probabilistic model for amino acid composition.

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    Main Results:

    • The a priori probability of deviation is uniform across all protein families.
    • Protein length, biological function, and evolutionary origin do not affect this probability.
    • A consistent statistical framework can describe amino acid composition deviations.

    Conclusions:

    • The inherent probability of amino acid composition deviation is a fundamental property of the genetic code.
    • This uniformity simplifies the study of protein evolution and molecular adaptation.
    • Future research can build upon this consistent probabilistic model.