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Related Concept Videos

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...
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...
The Movement of Organelles and Vesicles01:43

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In eukaryotic cells,  cytoskeletal filaments such as actin, microtubules, and intermediate filaments form a mesh-like cytoskeletal network. These filaments serve as tracks for transporting cellular cargo. Specialized motor proteins use the chemical energy stored in adenosine triphosphate (ATP) for this transport. During interphase, microtubules are polarized, with the plus-end towards the cell periphery and the minus-end towards the cell center. Two microtubule-associated motor proteins,...
Mechanism of Ciliary Motion01:05

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The ciliary structures were first seen in 1647 by Antonie Leeuwenhoek while observing the protozoans. In lower organisms, these appendages are responsible for cell movement, while in higher organisms, these appendages help in the movement of the extracellular fluids within the body cavities.
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Microtubule Associated Motor Proteins01:32

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Eukaryotic cells have different motor proteins for transporting various cargo within the cell. These motor proteins differ based on the filament they associate with, the direction they move within the cell, and the type of cargo they transport. Motor proteins that associate with microtubules are known as microtubule-associated motor proteins. There are two families of microtubule-associated motor proteins —Kinesins and Dyneins. Both these proteins assist in the transport of cellular cargos...
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Related Experiment Video

Updated: Jun 1, 2026

Directly Measuring Forces Within Reconstituted Active Microtubule Bundles
07:47

Directly Measuring Forces Within Reconstituted Active Microtubule Bundles

Published on: May 10, 2022

Nonlinear ionic pulses along microtubules.

D L Sekulić1, B M Satarić, J A Tuszynski

  • 1University of Novi Sad, Serbia. dalsek@yahoo.com

The European Physical Journal. E, Soft Matter
|May 24, 2011
PubMed
Summary
This summary is machine-generated.

Microtubules exhibit nonlinear polyelectrolyte behavior, guiding ionic currents via tubulin tails. This creates solitonic waves, suggesting microtubules act as biological transmission lines for cellular processes.

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Related Experiment Videos

Last Updated: Jun 1, 2026

Directly Measuring Forces Within Reconstituted Active Microtubule Bundles
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Simultaneous Visualization of the Dynamics of Crosslinked and Single Microtubules In Vitro by TIRF Microscopy

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Area of Science:

  • Cell Biology
  • Biophysics
  • Cytoskeletal Dynamics

Background:

  • Microtubules are essential cytoskeletal biopolymers involved in cell motility, division, and transport.
  • Their polyelectrolyte nature is crucial for intracellular ionic transport.
  • Understanding microtubule function in ionic transport is key to cellular processes.

Purpose of the Study:

  • To investigate the polyelectrolyte character of microtubules and its role in ionic transport.
  • To model the nonlinear behavior of ionic currents within microtubules.
  • To explore the potential for solitonic ionic waves in microtubules.

Main Methods:

  • Development of a theoretical model for ionic transport along microtubules.
  • Analysis of the nonlinear capacitance of tubulin dimers.
  • Investigation of tubulin C-terminal tail dynamics.

Main Results:

  • The proposed model demonstrates inherently nonlinear ionic current behavior guided by microtubules.
  • Microtubule nonlinearity originates from the nonlinear capacitance of tubulin dimers.
  • Conditions for the creation and propagation of solitonic ionic waves along microtubules were identified.

Conclusions:

  • Microtubules function as biological nonlinear transmission lines for ionic currents.
  • These ionic currents may play significant roles in cell division and neural cognitive processes.
  • The study highlights a novel aspect of microtubule function in cellular electrophysiology.