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Related Experiment Videos

The centromere-kinetochore complex: a repeat subunit model.

R P Zinkowski1, J Meyne, B R Brinkley

  • 1Department of Cell Biology, University of Alabama, Birmingham 35294.

The Journal of Cell Biology
|June 1, 1991
PubMed
Summary
This summary is machine-generated.

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This study reveals the kinetochore

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • The kinetochore is a protein structure that forms at the centromere of chromosomes during cell division.
  • Its precise three-dimensional structure and molecular composition remain incompletely understood.
  • Existing models do not fully explain the structural diversity and evolution of kinetochores.

Purpose of the Study:

  • To investigate the three-dimensional structure of the kinetochore.
  • To elucidate the DNA/protein composition of the centromere-kinetochore region.
  • To propose a novel model for kinetochore organization.

Main Methods:

  • Caffeine-induced detachment of unreplicated kinetochores.
  • Stretching of kinetochores using hypotonic and shear forces in a cytocentrifuge.

Related Experiment Videos

  • Electron microscopy (EM), immunostaining (CREST autoantibodies), and in situ hybridization.

    • Main Results:

    • Detached kinetochores yielded fragments, indicating a subunit organization.
    • Stretched kinetochores revealed a linear array of repetitive subunits along centromeric DNA.
    • Kinetochore subunits bind tubulin and contain cytoplasmic dynein.

    Conclusions:

    • The kinetochore is formed by the folding of a linear DNA fiber composed of tandemly repeated subunits.
    • This subunit model explains kinetochore structure, function, and diversity.
    • The proposed model offers a new framework for understanding centromere-kinetochore relationships.