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Related Concept Videos

Microtubules01:35

Microtubules

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There are three types of cytoskeletal structures in eukaryotic cells—microfilaments, intermediate filaments, and microtubules. With a diameter of about 25 nm, microtubules are the thickest of these fibers. Microtubules carry out a variety of functions that include cell structure and support, transport of organelles, cell motility (movement), and the separation of chromosomes during cell division.
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Microtubules01:18

Microtubules

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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.
Microtubules have two structurally similar globular protein subunits: α and β tubulins. In the cytosol, the α and β tubulins form a heterodimer....
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Microtubule Formation01:23

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...
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Destabilization of Microtubules01:45

Destabilization of Microtubules

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The destabilization of microtubules can occur during different stages of the microtubule lifecycle, such as nucleation or elongation. It can take place at either end of the microtubule or in the microtubule lattices as a whole. The lifespan of individual microtubules within a cell varies according to the cell type and stage of the cell cycle. During interphase, the lifespan of the microtubule is about 30 minutes, while during cell division, it is about 15 minutes. In axonal microtubules of...
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Assembly of Complex Microtubule Structures01:32

Assembly of Complex Microtubule Structures

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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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Microtubule Instability02:17

Microtubule Instability

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Microtubules are hollow cylindrical filaments having a diameter of approximately 25 nm and a length that varies from 200 nm to 25 μm. GTP-bound tubulin subunits form αβ-heterodimers for microtubule assembly. These core building blocks interact longitudinally, polymerizing into protofilaments. The protofilaments then interact with one another through lateral bonding forces to form stable cylindrical microtubules. These cylindrical filaments are dynamic as they undergo repeated...
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Simultaneous Visualization of the Dynamics of Crosslinked and Single Microtubules In Vitro by TIRF Microscopy
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Microtubule-organizing centres: a re-evaluation.

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Microtubule nucleation, essential for cell structure, is not limited to traditional organizing centers. New evidence reveals gamma-tubulin

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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
  • Cytoskeleton Dynamics

Background:

  • Microtubule organization is crucial for cellular processes.
  • Microtubule-Organizing Centres (MTOCs) nucleate and anchor microtubule minus ends.
  • Gamma-tubulin is essential for microtubule nucleation.

Purpose of the Study:

  • To review recent evidence on microtubule nucleation.
  • To challenge the conventional understanding of MTOCs.
  • To re-evaluate the concept of the MTOC.

Main Methods:

  • Literature review of recent findings.
  • Analysis of studies on gamma-tubulin-dependent nucleation.
  • Synthesis of data on microtubule organization.

Main Results:

  • Gamma-tubulin-dependent microtubule formation occurs outside conventional MTOCs.
  • Evidence suggests broader roles for microtubule nucleation.
  • Spatio-temporal control of nucleation is more complex than previously assumed.

Conclusions:

  • The definition and function of MTOCs require re-evaluation.
  • Microtubule nucleation is a more widespread cellular process.
  • Understanding microtubule dynamics necessitates a broader perspective on organizing centers.