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Primary structure of rat lysozyme

T J White, G A Mross, E F Osserman

    Biochemistry
    |April 5, 1977
    PubMed
    Summary
    This summary is machine-generated.

    The primary structure of rat lysozyme was determined, revealing evolutionary rates similar to lactalbumin. This suggests the gene duplication event for lactalbumin may be older than previously thought.

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    Area of Science:

    • Molecular Evolution
    • Comparative Genomics
    • Protein Biochemistry

    Background:

    • Lysozymes and lactalbumin share a common ancestor through gene duplication.
    • Previous studies suggested differing evolutionary rates between lysozyme and lactalbumin.

    Purpose of the Study:

    • To determine the primary structure of rat lysozyme.
    • To compare the evolutionary rates of lysozyme and lactalbumin.
    • To investigate factors influencing lysozyme evolution.

    Main Methods:

    • Peptide sequencing of reduced and carboxymethylated rat lysozyme.
    • Homology-based alignment with human lysozyme sequence.
    • Confirmation of overlaps using tryptic peptides and automated sequencing.

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    Main Results:

    • The primary structure of rat lysozyme was elucidated.
    • The evolutionary rate of rat lysozyme was estimated and found comparable to mammalian lactalbumin.
    • This contradicts previous findings suggesting faster lactalbumin evolution.

    Conclusions:

    • The gene duplication event creating lactalbumin from lysozyme may be more ancient than generally assumed.
    • Generation time does not appear to be a critical factor in lysozyme evolution.
    • Rodent and primate lysozyme evolution rates suggest conserved evolutionary mechanisms.