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Three soluble rat beta-galactoside-binding lectins.

R F Cerra, M A Gitt, S H Barondes

    The Journal of Biological Chemistry
    |September 5, 1985
    PubMed
    Summary
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    Rat lungs contain three distinct beta-galactoside-binding proteins, not just one as previously thought. These proteins vary in size and are present in different tissues, changing with age.

    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Proteomics

    Background:

    • Soluble beta-galactoside-binding proteins play roles in cellular processes.
    • Previous research indicated the presence of a single such protein in rat lungs.

    Purpose of the Study:

    • To identify and characterize the soluble beta-galactoside-binding proteins in rat lungs.
    • To investigate the presence and distribution of these proteins in different rat tissues and developmental stages.

    Main Methods:

    • Ion-exchange chromatography was used to resolve the proteins.
    • Antibodies were generated to differentiate between the identified proteins.
    • Tissue analysis was performed on immature and adult rat lungs, heart, skeletal muscle, and liver.

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    Main Results:

    • Three distinct beta-galactoside-binding proteins with subunit molecular weights of approximately 14,500, 18,000, and 29,000 were identified in rat lungs.
    • These proteins were separable by ion-exchange chromatography and showed minimal cross-reactivity with specific antibodies.
    • All three proteins were found in immature heart, skeletal muscle, and liver.
    • In adult tissues, only the 14,500 subunit protein was detected in heart, skeletal muscle, and liver.

    Conclusions:

    • Rat lungs possess a more complex composition of soluble beta-galactoside-binding proteins than previously recognized.
    • The expression of these lectins changes significantly with age and across different tissue types.
    • These findings suggest age-dependent and tissue-specific functions for beta-galactoside-binding proteins in rats.