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Related Experiment Videos

Evolution of human alpha 2-macroglobulin.

P M Starkey

    Acta Biologica Et Medica Germanica
    |January 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

    Researchers discovered a smaller, fish-based papain-binding protein (PBP) homologous to human alpha 2-macroglobulin (alpha 2M). This fish PBP shares inhibitory properties and structural features with human alpha 2M, suggesting evolutionary links.

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    Area of Science:

    • Biochemistry
    • Evolutionary Biology
    • Proteomics

    Background:

    • Human alpha 2-macroglobulin (alpha 2M) is a large plasma proteinase inhibitor.
    • Papain-binding protein (PBP) from plaice (Pleuronectes platessa L.) plasma was investigated for homology with human alpha 2M.

    Purpose of the Study:

    • To purify and characterize plaice PBP.
    • To compare the functional and structural properties of plaice PBP with human alpha 2M.
    • To explore the evolutionary relationship between fish PBP and human alpha 2M.

    Main Methods:

    • Protein purification from plaice plasma.
    • Molecular weight determination (Mr).
    • Analysis of subunit composition and structure.
    • Investigation of inhibitory properties and reaction with methylamine.

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    Main Results:

    • A plaice PBP, approximately half the molecular size of human alpha 2M, was purified.
    • Plaice PBP exhibited inhibitory properties similar to human alpha 2M.
    • The protein consisted of four dissimilar subunits (two I chains, Mr 105,000; two II chains, Mr 90,000).
    • The I chains contained a proteinase-sensitive 'bait region' and an autolytic site, forming covalent links with methylamine or proteinases.

    Conclusions:

    • Plaice PBP is considered homologous to human alpha 2M despite its smaller size.
    • A model for the evolution of human alpha 2M from smaller fish proteins is proposed.
    • A potential shared evolutionary origin between alpha 2M and complement components C3 and C4 is suggested.