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Related Experiment Videos

Selective polyamine-binding proteins. Spermine binding by an androgen-sensitive phosphoprotein.

T Liang, G Mezzetti, C Chen

    Biochimica Et Biophysica Acta
    |September 6, 1978
    PubMed
    Summary
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    A specific acidic protein in rat prostate binds spermine (a polyamine) selectively. Androgen hormones regulate this protein

    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Andrology

    Background:

    • The rat ventral prostate contains an acidic protein with selective spermine-binding capabilities.
    • This protein exhibits specific binding affinities for various aliphatic amines, with spermine showing the highest affinity.
    • Its physicochemical properties include an isoelectric point of pH 4.3, a sedimentation coefficient of 3 S, and a molecular weight of approximately 30,000.

    Purpose of the Study:

    • To characterize the spermine-binding protein in rat ventral prostate.
    • To investigate the regulation of this protein's activity by androgens.
    • To explore the potential role of this protein in androgen action within the prostate.

    Main Methods:

    • Purification and characterization of the spermine-binding protein.

    Related Experiment Videos

  • Assessment of amine binding affinities.
  • Enzymatic treatment (alkaline phosphatase, protein kinase) to study protein activity modulation.
  • Castration and androgen administration experiments in rats to investigate hormonal regulation.
  • Analysis of spermine binding to other prostate cytosol components like tRNAs.

    • Main Results:

    • The protein selectively binds spermine over other polyamines and demonstrates interaction with histones and nuclear chromatin.
    • Spermine-binding activity is regulated by phosphorylation; inactivated by alkaline phosphatase and reactivated by protein kinase with cyclic AMP and ATP.
    • Activity decreases after castration and rapidly increases upon administration of 5alpha-dihydrotestosterone.
    • Spermine also binds to 4-S tRNAs and a unique 1.5 S RNA in prostate cytosol.

    Conclusions:

    • The acidic protein in rat ventral prostate is a key player in spermine binding and its activity is androgen-dependent.
    • Androgen-induced increases in this protein may facilitate polyamine translocation to nuclear chromatin, potentially mediating androgenic effects.
    • This protein and its interaction with polyamines represent a novel mechanism in prostate physiology and androgen signaling.