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Microscopy of Fission Yeast Sexual Lifecycle
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Subunit interactions and arrangements in the fission yeast Mis16-Mis18-Mis19 complex
Melanie Korntner-Vetter1, Stéphane Lefèvre1, Xiao-Wen Hu1
1Structural Biology of Chromosome Segregation Laboratory, The Francis Crick Institute, London, UK.
Life Science Alliance
|August 3, 2019
Summary
Researchers elucidated the structure of Mis19, a key protein in centromeric chromatin assembly. This reveals its interaction with Mis16, crucial for depositing the CENP-A histone variant in fission yeast.
Area of Science:
- Molecular Biology
- Chromatin Biology
- Epigenetics
Background:
- Centromeric chromatin is essential for chromosome segregation.
- Fission yeast centromeres utilize the histone H3 variant Cnp1 (CENP-A).
- Cnp1 deposition requires the Mis16-Mis18-Mis19 complex for cell cycle-specific assembly.
Purpose of the Study:
- To determine the structure of the Mis19 protein.
- To characterize the interaction between Mis19 and Mis16.
- To understand the architecture and stoichiometry of the Mis18-Mis19 complex.
Main Methods:
- X-ray crystallography to determine protein structure.
- Biochemical assays to analyze protein-protein interactions.
- Analysis of complex stoichiometry and architecture.
Main Results:
- The structure of the essential Mis18 partner protein Mis19 was determined.
- A bipartite-binding site mediating Mis19-Mis16 interaction was identified.
- Detailed insights into the Mis18-Mis19 interface and complex architecture were provided.
Conclusions:
- Mis19 structure and its interaction with Mis16 are critical for centromeric chromatin assembly.
- Understanding the Mis18-Mis19 complex advances knowledge of CENP-A deposition mechanisms.
- This work provides a structural basis for the Mis16-Mis18-Mis19 complex function in fission yeast.
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