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Related Experiment Videos

Three-dimensional structure of the zona pellucida

D P Green1

  • 1Department of Anatomy and Structural Biology, School of Medical Sciences, University of Otago Medical School, Dunedin, New Zealand.

Reviews of Reproduction
|January 1, 1998
PubMed
Summary

The zona pellucida, crucial for mammalian oocytes, comprises ZP1, ZP2, and ZP3 proteins. A proposed model suggests ZP2-ZP3 heterodimers form filaments cross-linked by ZP1, though the exact structure requires further investigation.

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Area of Science:

  • Reproductive Biology
  • Molecular Biology
  • Structural Biology

Background:

  • The zona pellucida is a vital extracellular coat surrounding mammalian oocytes, with its structure and composition studied extensively in mice.
  • It is composed of three main glycoproteins: ZP1, ZP2, and ZP3, which are glycosylated and have distinct molecular masses.

Purpose of the Study:

  • To review and synthesize current data on the molecular composition and structural organization of the mammalian zona pellucida.
  • To propose and evaluate models for zona pellucida assembly and function, particularly concerning the zona block to polyspermy.

Main Methods:

  • Analysis of existing data, primarily from mouse models, including protein sequencing, gene knockout, and antisense experiments.
  • Ultrastructural examination and biochemical analysis of zona pellucida proteins and their interactions.

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Main Results:

  • The zona pellucida consists of ZP1, ZP2, and ZP3 proteins in a specific molar ratio (ZP1 ~9% of ZP2+ZP3), with ZP2:ZP3 ratio near 1:1.
  • A model proposes ZP2-ZP3 heterodimers form filaments, cross-linked by ZP1, consistent with experimental data but awaiting definitive proof.
  • The cortical reaction releases material that could significantly alter the zona pellucida's inner surface composition and function.

Conclusions:

  • The proposed ZP2-ZP3 filament model with ZP1 cross-linking provides a framework for understanding zona pellucida structure.
  • Further research is needed to confirm the precise structural arrangement and the implications of ZP1 distribution and cortical granule release.
  • The zona block to polyspermy may involve direct binding site titration rather than solely enzymatic modification of ZP2.