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Attachment of Sister Chromatids

Attachment of Sister Chromatids

As cells progress into mitosis, the nuclear envelope breaks down, and the condensed chromosomes are exposed to the array of bipolar microtubules of the mitotic spindle. The kinetochore, a large, disc-shaped protein complex, is present at the centromere region of the sister chromatids and acts as a binding site for the microtubules. Usually, the plus-end of a single microtubule is embedded within the kinetochore. However, some kinetochores first establish lateral contact with the side-wall of a...

Attachment of Sister Chromatids

Attachment of Sister Chromatids

As cells progress into mitosis, the nuclear envelope breaks down, and the condensed chromosomes are exposed to the array of bipolar microtubules of the mitotic spindle. The kinetochore, a large, disc-shaped protein complex, is present at the centromere region of the sister chromatids and acts as a binding site for the microtubules. Usually, the plus-end of a single microtubule is embedded within the kinetochore. However, some kinetochores first establish lateral contact with the side-wall of a...

Forces Acting on Chromosomes

Forces Acting on Chromosomes

During mitosis, chromosome movements occur through the interplay of multiple piconewton level forces. In prometaphase, these forces help in chromosome assembly or congression at the equatorial plane, eventually leading to their alignment at the metaphase plate. The forces acting on the chromosomes are space and time-dependent; therefore, they vary with the position of the chromosomes as the cell progresses through mitosis.
Microtubules and motor proteins exert two types of forces on...

Forces Acting on Chromosomes

Forces Acting on Chromosomes

During mitosis, chromosome movements occur through the interplay of multiple piconewton level forces. In prometaphase, these forces help in chromosome assembly or congression at the equatorial plane, eventually leading to their alignment at the metaphase plate. The forces acting on the chromosomes are space and time-dependent; therefore, they vary with the position of the chromosomes as the cell progresses through mitosis.
Microtubules and motor proteins exert two types of forces on...

The Spindle Assembly Checkpoint

The Spindle Assembly Checkpoint

The spindle assembly checkpoint is a molecular surveillance mechanism ensuring the fidelity of chromosome segregation during anaphase. The checkpoint monitors the completion of all the prerequisite steps before chromosome segregation to determine whether the segregation process should proceed or be delayed.
Many proteins function together to control the spindle assembly checkpoint. Mutations affecting these proteins may allow cells to proceed into anaphase prematurely, resulting in the...

The Mitotic Spindle

The Mitotic Spindle

The mitotic spindle—or spindle apparatus—is a eukaryotic, cytoskeletal structure made up of long protein fibers called microtubules. Formed during cell division, the spindle separates sister chromatids and moves them to opposite ends of a parental cell, where the now individual chromosomes are distributed to two daughter cell nuclei.
The bipolar configuration of the mitotic spindle facilitates chromosomal segregation, preparing the cell for division. One mechanism that ensures bipolar mitotic...

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Related Experiment Video

Updated: Jul 4, 2026

Immunofluorescence Analysis of Endogenous and Exogenous Centromere-kinetochore Proteins

Immunofluorescence Analysis of Endogenous and Exogenous Centromere-kinetochore Proteins

Published on: March 3, 2016

Insights into the kinetochore.

Charles L Asbury, Trisha N Davis

Structure (London, England : 1993)

|June 13, 2008

Summary

This summary is machine-generated.

The Ndc80 complex, crucial for linking chromosomes to microtubules, has had its atomic structure revealed. This breakthrough offers insights into kinetochore architecture and chromosome movement control during cell division.

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Area of Science:

Cell Biology
Structural Biology
Molecular Motors

Background:

The Ndc80 complex is a key component of the kinetochore, mediating the crucial attachment between chromosomes and spindle microtubules.
Accurate chromosome segregation during mitosis relies on the proper function of the kinetochore-microtubule interface.

Discussion:

The atomic-level structure of the Ndc80 complex provides unprecedented detail on its architecture.
Understanding the Ndc80 complex structure illuminates how it functions at the kinetochore-microtubule attachment site.
This structural information is vital for comprehending the mechanics of chromosome movement and segregation.

Key Insights:

The study presents the atomic structure of the Ndc80 complex, revealing its intricate molecular organization.
The structure elucidates the interaction interfaces within the Ndc80 complex and with microtubules.
Implications for kinetochore assembly and the regulation of chromosome dynamics during mitosis are highlighted.

Outlook:

Further structural studies of the Ndc80 complex in different functional states are warranted.
The atomic structure may guide the development of novel therapeutic strategies targeting mitotic errors.
This work provides a foundation for future research into kinetochore-microtubule dynamics and chromosome segregation fidelity.