Seeing is believing: our evolving view of kinetochore structure, composition, and assembly

Area of Science:

• Cell Biology
• Molecular Biology
• Biochemistry

Background:

• The kinetochore is a protein complex essential for chromosome segregation during cell division.
• Understanding kinetochore structure and function is crucial for comprehending cell cycle regulation and aneuploidy.
• Recent advances have provided new insights into kinetochore dynamics and protein interactions.

Purpose of the Study:

• To review recent trends in kinetochore biology, focusing on structural data, dynamic composition, and microtubule-binding mechanisms.
• To compare and contrast the human and budding yeast kinetochore systems.
• To highlight the similarities and differences between these two well-studied models.

Main Methods:

• Literature review of recent studies in kinetochore biology.
• Focus on structural data of key kinetochore protein complexes.
• Comparative analysis of human and budding yeast kinetochore systems.

Main Results:

• Proliferation of structural data for kinetochore protein complexes (e.g., CBF3, Dam1c, Mis12c^MIND, CENP-NL^Chl4/Iml3).
• Growing evidence for a dynamic kinetochore whose composition changes throughout the cell cycle.
• Multiple pathways identified for recruiting microtubule-binding elements to inner kinetochore proteins.

Conclusions:

• The kinetochore is a dynamic structure with cell cycle-dependent compositional changes.
• Human and budding yeast kinetochores exhibit significant similarities despite evolutionary divergence.
• Intriguing differences between human and yeast kinetochores offer further avenues for research.