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Related Concept Videos

Phosphorylation01:02

Phosphorylation

51.1K
The addition or removal of phosphate groups from proteins is the most common chemical modification that regulates cellular processes. These modifications can affect the structure, activity, stability, and localization of proteins within cells as well as their interactions with other proteins.
During phosphorylation, protein kinases transfer the terminal phosphate group of ATP to specific amino acid side chains of substrate proteins. Serine, threonine, and tyrosine are the most commonly...
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Meiosis II02:02

Meiosis II

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Meiosis II entails cell division and segregation of the sister chromatids, resulting in the production of four unique haploid gametes. The steps for meiosis II are similar to mitosis, except that meiosis II occurs in haploid cells, whereas mitosis occurs in diploid cells.
The timing and cell division patterns of meiosis differ between males and females. In male meiosis, the centrosomes are part of the formation of the meiotic spindle. However, in oocytes, including that of humans, Drosophila,...
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Protein Kinases and Phosphatases02:54

Protein Kinases and Phosphatases

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Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven.
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
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Meiosis vs. Mitosis02:57

Meiosis vs. Mitosis

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Cell division is necessary for growth and reproduction in organisms. Mitosis aids cell growth and development by dividing somatic cells. In contrast, meiosis causes the division of germ cells and plays an essential role in sexual reproduction. Due to their unique functional requirements, mitosis and meiosis differ from each other in multiple aspects.
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Related Experiment Video

Updated: Sep 8, 2025

Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay
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Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay

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Decoding protein phosphorylation during oocyte meiotic divisions using phosphoproteomics.

Leonid Peshkin1, Enrico Maria Daldello2, Elizabeth S Van Itallie1

  • 1Systems Biology Department, Harvard Medical School, Boston, United States.

Elife
|July 17, 2025
PubMed
Summary

This study reveals crucial protein changes during Xenopus oocyte maturation, highlighting shifts in protein stability and phosphorylation essential for meiotic progression and reproduction in vertebrates.

Keywords:
biochemistrycell biologychemical biologymeiotic maturationoocytephosphoproteomexenopus

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Last Updated: Sep 8, 2025

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Area of Science:

  • Cell Biology
  • Developmental Biology
  • Molecular Biology

Background:

  • Oocyte meiotic divisions are vital for sexual reproduction, transforming a diploid oocyte into a haploid egg.
  • Unlike somatic cells, oocyte maturation relies on protein abundance and modifications, not transcription.

Purpose of the Study:

  • To analyze protein abundance and phosphorylation during Xenopus oocyte meiotic maturation.
  • To understand the molecular mechanisms governing meiotic progression.

Main Methods:

  • Proteomic analysis of protein abundance and phosphorylation.
  • Correlation of molecular events with cytological meiotic milestones.

Main Results:

  • Significant shifts in protein stability affecting spindle assembly, DNA replication, and RNA-binding.
  • Broad changes in phosphorylation linked to nuclear envelope disassembly, membrane trafficking, and microtubule dynamics.
  • Specific phosphorylation events targeting Cdk1 and the Mos/MAPK pathway.

Conclusions:

  • Protein dynamics and phosphorylation orchestrate oocyte meiotic divisions.
  • Findings provide insights into vertebrate meiotic progression and may apply to other species.