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Related Experiment Videos

Zonadhesin: characterization, localization, and zona pellucida binding.

I A Lea1, P Sivashanmugam, M G O'Rand

  • 1Department of Cell and Developmental Biology, University of North Carolina at Chapel Hill, 27599, USA. ialea@email.unc.edu

Biology of Reproduction
|November 22, 2001
PubMed
Summary

Zonadhesin, a sperm protein, is processed into fragments that bind the zona pellucida after the acrosome reaction. This binding is crucial for sperm-egg interaction during fertilization.

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Area of Science:

  • Reproductive Biology
  • Molecular Endocrinology
  • Cell Biology

Background:

  • Zonadhesin is a transmembrane protein implicated in sperm-zona pellucida binding.
  • Understanding zonadhesin's role is key to deciphering fertilization mechanisms.

Purpose of the Study:

  • To investigate zonadhesin's processing, expression, localization, and zona pellucida binding in rabbits.
  • To elucidate the functional significance of zonadhesin during fertilization.

Main Methods:

  • Sequencing of rabbit zonadhesin.
  • Analysis of protein processing, mRNA expression, and cellular localization.
  • In vitro binding assays using recombinant zonadhesin domains.

Main Results:

Related Experiment Videos

  • Zonadhesin precursor is testis-specific; processed into p43, p97, and p58 fragments.
  • Fragments form disulfide-bonded dimers in mature spermatozoa.
  • Zonadhesin mRNA is synthesized in primary spermatocytes; protein abundant in Sertoli cells and spermatids.
  • In spermatozoa, zonadhesin localizes to the anterior acrosome and is released with the acrosomal shroud post-acrosome reaction.
  • Recombinant D4 domain binds the zona pellucida.

    • Conclusions:

    • Zonadhesin functions post-acrosome reaction, mediating binding via the acrosomal shroud.
    • The D4 domain is critical for zona pellucida interaction.