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Related Concept Videos

Forces Acting on Chromosomes02:11

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...
Disassembly of Intermediate Filaments01:35

Disassembly of Intermediate Filaments

Intermediate filaments (IFs) do not undergo spontaneous disassembly. Enzymes, kinases, and phosphatases add and remove phosphates from specific sites to regulate their disassembly. The IF concentration in the cytoplasm also regulates the disassembly. If the concentration crosses a threshold, it activates the protein kinases in the vicinity, allowing the phosphorylation of IFs.
Keratin proteins, found at the cell periphery near cell junctions, undergo a cycle of assembly and disassembly. In Type...
Cytoskeletal Proteins in Bacteria01:29

Cytoskeletal Proteins in Bacteria

Bacterial cells were initially considered simple, randomly organized structures lacking a cytoskeleton. However, the discovery of cytoskeleton homologs in bacteria led to the change of this opinion. Bacterial cytoskeletal filaments regulate the cell shape, cell polarity, cell division, and partitioning of plasmids during cell division. It was later discovered that bacterial cytoskeletal proteins, mainly actin and tubulin homologs, are diverse compared to their eukaryotic counterparts. On the...
Anaphase A and B01:39

Anaphase A and B

Microtubules form through the end-to-end polymerization of tubulin heterodimers. Kinetochore microtubules originate from the spindle poles, and their plus-ends connect with the kinetochores on sister-chromatids. Ndc80 protein complexes, present on the kinetochore, form low-affinity links with the plus end of these kinetochore microtubules.
Plus-end depolymerization releases tubulin heterodimers from the terminal region of the microtubule. As tubulin subunits are lost, the Ndc80 complexes detach...
Actin Filament Depolymerization01:19

Actin Filament Depolymerization

Actin filaments (F-actin) are composed of actin subunits. The dissociation of actin monomers can occur from either end of F-actin. The rate of dissociation is faster from the minus-end or the pointed end, where the actin subunits exist with a bound ADP, together known as ADP-actin. The depolymerization of F-actin is aided by proteins, including the actin-depolymerizing factor (ADF) and cofilin family of proteins, gelsolin, and glia maturation factor (GMF).
In F-actin, the ADF/cofilin proteins...
Attachment of Sister Chromatids02:57

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...

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Directly Measuring Forces Within Reconstituted Active Microtubule Bundles
07:47

Directly Measuring Forces Within Reconstituted Active Microtubule Bundles

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Filament depolymerization can explain chromosome pulling during bacterial mitosis.

Edward J Banigan1, Michael A Gelbart, Zemer Gitai

  • 1Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America.

Plos Computational Biology
|October 4, 2011
PubMed
Summary
This summary is machine-generated.

Bacterial chromosome segregation relies on a depolymerizing ParA protein pulling the chromosome. This process is driven by a self-diffusiophoretic mechanism, where ParA disassembly creates a gradient that moves the chromosome effectively.

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Last Updated: May 28, 2026

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Published on: August 13, 2016

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Area of Science:

  • Cell Biology
  • Microbiology
  • Biophysics

Background:

  • Chromosome segregation is essential for cell division.
  • The force-generating mechanisms for bacterial chromosome translocation are not well understood.
  • Caulobacter crescentus uses a ParA/ParB system for chromosome segregation.

Purpose of the Study:

  • To elucidate the mechanism of chromosome translocation in Caulobacter crescentus.
  • To explain how a depolymerizing protein structure can drive chromosome movement.
  • To investigate the role of the ParA/ParB system in bacterial chromosome segregation.

Main Methods:

  • Brownian dynamics simulations of the ParABS system.
  • Development of a physically consistent model for ParA dynamics and chromosome interaction.
  • Analysis of translocation robustness across various parameters.

Main Results:

  • The study proposes a 'self-diffusiophoretic' mechanism for chromosome translocation.
  • ParB-mediated ParA disassembly creates a concentration gradient, driving chromosome movement.
  • Translocation is most robust when ParB binds side-on to ParA filaments.
  • A single dimensionless quantity controls translocation robustness.

Conclusions:

  • The self-diffusiophoretic model provides a robust explanation for bacterial chromosome segregation.
  • The findings explain phenomena like segregation failure and velocity dependence on filament length.
  • The ParA/ParB system's dynamics are crucial for efficient and accurate chromosome movement.