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Related Experiment Videos

Sensitive assay detects protein methylesterase in spermatozoa: decrease in enzyme activity during epididymal

C Gagnon, D Harbour, E De Lamirande

    Biology of Reproduction
    |May 1, 1984
    PubMed
    Summary
    This summary is machine-generated.

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    A new assay detects protein methylesterase (PME) activity. PME levels are high in early sperm maturation but drop significantly as sperm gain motility and fertilizing capacity.

    Area of Science:

    • Biochemistry
    • Reproductive Biology
    • Enzymology

    Background:

    • Protein methylesterase (PME) plays a role in cellular processes.
    • Understanding PME activity during sperm maturation is crucial for reproductive health.

    Purpose of the Study:

    • To develop a more sensitive assay for PME.
    • To investigate PME activity in spermatozoa during epididymal maturation.

    Main Methods:

    • Developed a novel assay measuring methanol formation from protein-methyl ester hydrolysis.
    • Assayed PME activity in rat and bull spermatozoa from different epididymal regions.

    Main Results:

    • The new PME assay demonstrated linearity with time and enzyme concentration.

    Related Experiment Videos

  • Rat spermatozoa from cauda epididymidis showed very low PME activity, while caput epididymidis spermatozoa had 10-fold higher activity.
  • Bull spermatozoa showed low PME activity in testes, peaking in the caput epididymidis (1.29 pmol/mg protein), and decreasing significantly in the cauda epididymidis (0.06 pmol/mg protein).

    • Conclusions:

    • The developed PME assay is highly sensitive.
    • PME activity significantly decreases during sperm epididymal maturation.
    • The decline in PME activity correlates with the acquisition of sperm motility and fertilizing capacity.