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Updated: Mar 29, 2026
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Protein Purification Technique that Allows Detection of Sumoylation and Ubiquitination of Budding Yeast Kinetochore Proteins Ndc10 and Ndc80
Published on: May 3, 2015
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The synaptonemal complex is assembled by a polySUMOylation-driven feedback mechanism in yeast
Wing-Kit Leung1, Neil Humphryes1, Negar Afshar1
1Genome Damage and Stability Centre, Life Sciences, University of Sussex, Brighton BN19RQ, England, UK.
The Journal of Cell Biology
|November 25, 2015
Summary
SUMOylation of Ecm11 regulates transverse filament polymerization, crucial for synaptonemal complex assembly during meiosis. This process involves a positive feedback loop between TF assembly and Ecm11 SUMOylation, ensuring proper chromosome pairing.
Area of Science:
- Cell Biology
- Genetics
- Molecular Biology
Background:
- Synaptonemal complexes (SCs) are essential protein structures that connect homologous chromosomes during meiotic prophase I.
- Transverse filaments (TFs) form polymeric arrays within SCs, and their proper polymerization is critical for SC formation and function.
Purpose of the Study:
- To investigate the role of SUMO conjugation to Ecm11 in regulating TF polymerization and SC assembly in budding yeast.
- To elucidate the mechanism by which TF assembly and Ecm11 SUMOylation interact to control SC formation.
Main Methods:
- Utilized budding yeast as a model organism.
- Analyzed the correlation between Ecm11 SUMOylation levels and TF polymerization efficiency.
- Investigated the impact of hyperSUMOylation and hypoSUMOylation of Ecm11 on SC structure.
- Examined the role of the Zip1 N terminus and Gmc2 in activating Ecm11 SUMOylation.
Main Results:
- TF polymerization efficiency directly correlates with the extent of SUMO conjugation to Ecm11.
- HyperSUMOylation of Ecm11 results in aberrant TF aggregation and extrachromosomal structure formation.
- HypoSUMOylation of Ecm11 leads to fragmented SCs, indicating defective TF polymerization.
- The N terminus of Zip1 activates Ecm11 SUMOylation, and coexpression with Gmc2 induces polySUMOylation in nonmeiotic cells.
Conclusions:
- A positive feedback loop exists between TF assembly and Ecm11 polySUMOylation, essential for robust SC assembly.
- This regulatory mechanism ensures proper control of TF polymerization, thereby facilitating accurate homologous chromosome pairing during meiosis.
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