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Related Concept Videos

Microtubule Associated Motor Proteins01:32

Microtubule Associated Motor Proteins

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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...
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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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Blebs are a type of membrane protrusion formed by the internal hydrostatic pressure of the cytoplasm. Blebs are observed in several cell types, including fibroblasts, immune cells, and single-celled organisms like the amoeba. The primary function of blebs is cell locomotion and apoptosis, but they are also found during necrosis and cell division. The life cycle of a bleb comprises an initiation phase followed by the expansion and retraction phases.
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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,...
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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.
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Related Experiment Video

Updated: May 2, 2026

Reconstitution of Basic Mitotic Spindles in Spherical Emulsion Droplets
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Reconstitution of cortical Dynein function.

Sophie Roth1, Liedewij Laan2, Marileen Dogterom1

  • 1FOM Institute AMOLF, Science Park, Amsterdam, The Netherlands.

Methods in Enzymology
|March 18, 2014
PubMed
Summary
This summary is machine-generated.

This study details in vitro assays to observe cytoplasmic dynein

Keywords:
CentrosomesCortical dyneinGold-thiol chemistryMicrofabricated chambersMicrofluidicsMicrotubulesw/o emulsion droplet

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Area of Science:

  • Cell Biology
  • Molecular Motors
  • Cytoskeletal Dynamics

Background:

  • Cytoplasmic dynein is a crucial microtubule (MT)-associated motor protein in eukaryotic cells.
  • Cortical dynein interacts with MTs to regulate nuclear migration, spindle orientation, and wound healing.
  • Understanding these interactions is key to cellular mechanics.

Purpose of the Study:

  • To describe three in vitro reconstituted assays for studying cortical dynein-MT interactions.
  • To demonstrate assays of increasing complexity for observing dynein function.
  • To explore how cortical dynein influences centrosome positioning.

Main Methods:

  • A 1D assay using MTs grown against dynein-coated gold barriers.
  • 2D microfabricated chambers with dynein-coated boundaries.
  • 3D water-in-oil emulsion droplets with dynein-coated boundaries.

Main Results:

  • Detailed observation of MT-dynein interactions at barriers in the 1D assay.
  • Successful reconstitution of dynamic asters interacting with cortical dynein in 2D and 3D environments.
  • Demonstration of assays for studying centrosome positioning by cortical dynein.

Conclusions:

  • These reconstituted systems provide powerful tools to study cortical dynein functions.
  • The assays offer a scalable approach to investigate dynein-MT interactions in controlled environments.
  • Future work can further enhance the complexity of these systems for deeper insights.