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Related Concept Videos

Fertilization01:38

Fertilization

During fertilization, an egg and sperm cell fuse to create a new diploid structure. In humans, the process occurs once the egg has been released from the ovary, and travels into the fallopian tubes. The process requires several key steps: 1) sperm present in the genital tract must locate the egg; 2) once there, sperm need to release enzymes to help them burrow through the protective zona pellucida of the egg; and 3) the membranes of a single sperm cell and egg must fuse, with the sperm...
Spermatogenesis01:41

Spermatogenesis

Spermatogenesis is the process by which haploid sperm cells are produced in the male testes. It starts with stem cells located close to the outer rim of seminiferous tubules. These spermatogonial stem cells divide asymmetrically to give rise to additional stem cells (meaning that these structures “self-renew”), as well as sperm progenitors, called spermatocytes. Importantly, this method of asymmetric mitotic division maintains a population of spermatogonial stem cells in the male reproductive...
Spermatogenesis01:22

Spermatogenesis

Spermatogenesis is a complex process that involves the development of sperm cells from undifferentiated stem cells in the seminiferous tubules of the testes. The process is essential for the production of mature and functional sperm cells that are capable of fertilizing an egg.
The process of spermatogenesis can be divided into mitosis, meiosis, and spermiogenesis. During mitosis, the spermatogonia or stem cells divide to produce two identical daughter cells, type A and B spermatogonia. Type-A...
Sperm Transport01:15

Sperm Transport

The journey of sperm from its origin to the point of ejaculation begins within the seminiferous tubules of the testis. Here, Sertoli cells produce fluid that propels non-motile sperm through a series of conduits, starting with the straight tubules leading to the rete testis. This interconnected network of tubules acts as the initial pathway for sperm, guiding them into the efferent ductules and then into the epididymis for maturation.
The maturation phase occurs in the epididymis, where sperm...
Sperm Structure and Semen Composition01:22

Sperm Structure and Semen Composition

During ejaculation, males release around 2-5 milliliters of semen, which is a complex mixture of mature sperm and various fluids produced by accessory glands. The mature sperm cells measure approximately 60 micrometers in length and consist of a head, neck, midpiece, and tail. The head is flattened and tapered, measuring about 4 to 5 micrometers in length. It contains a nucleus with condensed chromosomes and an acrosome, a cap-like structure filled with enzymes essential for penetrating the...
The Proteasome02:18

The Proteasome

Eukaryotic cells can degrade proteins through several pathways. One of the most important amongst these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...

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Related Experiment Video

Updated: Jun 1, 2026

Medium-throughput Screening Assays for Assessment of Effects on Ca2+-Signaling and Acrosome Reaction in Human Sperm
05:44

Medium-throughput Screening Assays for Assessment of Effects on Ca2+-Signaling and Acrosome Reaction in Human Sperm

Published on: March 1, 2019

Sperm proteasome and fertilization.

Peter Sutovsky1

  • 1Division of Animal Sciences, Department of Obstetrics, Gynecology and Women's Health, University of Missouri-Columbia, Columbia, Missouri 65211-5300, USA. sutovskyp@missouri.edu

Reproduction (Cambridge, England)
|May 25, 2011
PubMed
Summary

The ubiquitin-proteasome system (UPS) degrades sperm receptors on the vitelline coat, enabling fertilization. Modulating sperm proteasomes offers potential applications in reproductive medicine.

Area of Science:

  • Reproductive Biology
  • Molecular Biology
  • Cell Biology

Background:

  • The ubiquitin-proteasome system (UPS) is crucial for protein degradation.
  • Spermatozoa utilize UPS components for fertilization processes.
  • The vitelline coat (VC) and zona pellucida (ZP) are key barriers to sperm penetration.

Purpose of the Study:

  • To review the involvement of the UPS in sperm penetration through the VC/ZP.
  • To explore the role of UPS in sperm capacitation and acrosome reaction.
  • To discuss potential applications of UPS modulation in reproductive medicine.

Main Methods:

  • Review of existing literature on UPS and fertilization.
  • Detection and localization of proteasomal subunits in spermatozoa.

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Fluorimetric Techniques for the Assessment of Sperm Membranes
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Fluorimetric Techniques for the Assessment of Sperm Membranes

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Phosphopeptide Analysis of Rodent Epididymal Spermatozoa
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Phosphopeptide Analysis of Rodent Epididymal Spermatozoa

Published on: December 30, 2014

Related Experiment Videos

Last Updated: Jun 1, 2026

Medium-throughput Screening Assays for Assessment of Effects on Ca2+-Signaling and Acrosome Reaction in Human Sperm
05:44

Medium-throughput Screening Assays for Assessment of Effects on Ca2+-Signaling and Acrosome Reaction in Human Sperm

Published on: March 1, 2019

Fluorimetric Techniques for the Assessment of Sperm Membranes
08:58

Fluorimetric Techniques for the Assessment of Sperm Membranes

Published on: November 28, 2018

Phosphopeptide Analysis of Rodent Epididymal Spermatozoa
09:30

Phosphopeptide Analysis of Rodent Epididymal Spermatozoa

Published on: December 30, 2014

  • Measurement of proteolytic and deubiquitinating activities in spermatozoa.
  • Application of proteasome inhibitors and antibodies to study fertilization.

    • Main Results:

    • Spermatozoa release UPS components to degrade VC/ZP receptors.
    • Proteasomal activity is essential for successful fertilization in various species.
    • Modulation of sperm-associated deubiquitinating enzymes can ameliorate polyspermy.

    Conclusions:

    • The extracellular UPS plays a significant role in regulating animal fertilization.
    • Sperm-associated proteasomes are key players in sperm-egg interaction.
    • Targeting sperm UPS components may offer novel diagnostic and therapeutic strategies for human reproduction.