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Microtubule Formation

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Microtubules are dynamic structures that undergo continuous assembly and disassembly. They originate from specialized multi-protein complexes known as microtubule organizing centers or MTOCs. Within the MTOC, the point of origin of the microtubule is known as the minus end, while the end radiating outward is the plus end. Microtubules serve two primary functions — the organization of spindle complexes to separate sister chromatids during mitotic or meiotic cell division and the formation of...

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Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.

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Microtubules are the thickest cytoskeletal filaments with a diameter of 25 nm. In prokaryotic organisms, microtubules are commonly found in locomotory appendages like cilia and flagella. In eukaryotic cells, microtubules form specialized extensions for moving fluid over the surface, like those found in cells lining the intestine.
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Microtubules

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Microtubules in Cell Motility

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Microtubules are thick hollow cylindrical proteins that help form the cytoskeleton. Microtubules have varied roles in the cell. These filaments help form cellular appendages like cilia and flagella, which are responsible for locomotion. The cilia arise from basal bodies, separated from the main body by a membrane-like structure forming the transition zone. This zone is the gate for the entry of lipids and proteins, creating a unique composition of lipids and proteins in the ciliary membrane and...

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Microtubules are thick hollow cylindrical proteins that help form the cytoskeleton. Microtubules have varied roles in the cell. These filaments help form cellular appendages like cilia and flagella, which are responsible for locomotion. The cilia arise from basal bodies, separated from the main body by a membrane-like structure forming the transition zone. This zone is the gate for the entry of lipids and proteins, creating a unique composition of lipids and proteins in the ciliary membrane and...

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Related Experiment Video

Updated: May 13, 2026

Self-Assembly of Microtubule Tactoids

Self-Assembly of Microtubule Tactoids

Published on: June 23, 2022

MAP65 coordinate microtubule growth during bundle formation.

Virginie Stoppin-Mellet¹, Vincent Fache, Didier Portran

¹Laboratoaire de Physiologie Cellulaire & Végétale, Institut de Recherches en Technologies et Sciences pour le Vivant (iRTSV), Centre National de la Recherche Scientifique/Commissariat à l'énergie atomique et aux énergies alternatives/Institut National de la Recherche Agronomique/Université Joseph Fourier (CNRS/CEA/INRA/UJF), Grenoble, France. virginie.stoppin-mellet@cea.fr

|February 26, 2013

Summary

This summary is machine-generated.

Microtubule-associated proteins (MAPs) like MAP65 regulate microtubule (MT) bundle dynamics. MAP65 stabilizes MTs, promoting sustained growth and coordinating elongation within bundles based on MT polarity.

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Area of Science:

Cell Biology
Biophysics
Structural Biology

Background:

Microtubules (MTs) are essential for cell structure and function.
Microtubule-associated proteins (MAPs) mediate MT bundling, influencing cellular mechanics.
The impact of MAP-mediated lateral connections on MT dynamics within bundles remains unclear.

Purpose of the Study:

To investigate how plant MAP65 proteins affect the dynamics of microtubule bundles.
To determine the role of MT polarity in MAP65-mediated bundle formation and elongation.

Main Methods:

In vitro reconstitution of microtubule bundling using plant MAP65-1 and MAP65-4.
Analysis of MT bundle dynamics, including depolymerization and elongation phases.
Development and simulation of a biophysical model for MT bundling.

Main Results:

MAP65 proteins limit the depolymerization of MT bundles and prolong elongation phases.
Sustained bundle elongation is driven by coordinated MT growth and proximity of MT ends.
Model simulations show higher rescue frequencies between parallel than anti-parallel MTs.
MT polarity within MAP65-bundled structures controls the amplitude of bundle growth.

Conclusions:

MAP65-mediated MT bundling robustly coordinates MT elongation within bundles.
MT polarity is a critical factor finely tuned by MAPs to regulate bundle dynamics.
These findings provide insights into the mechanisms of cytoskeletal organization and force generation.