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Related Concept Videos

Microtubules in Cell Motility01:24

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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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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Assembly of Complex Microtubule Structures01:32

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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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Spindle Assembly02:50

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Spindle assembly occurs through three, often coexisting, pathways – the centrosome-mediated pathway, the chromatin-mediated pathway, and the microtubule-mediated pathway – collectively contributing to form a robust spindle apparatus.
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Neurons: The Axon01:21

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Axons are long, cytoplasmic processes of nerve cells capable of propagating electrical impulses known as action potentials. The cytoplasm or axoplasm of an axon contains neurofibrils, neurotubules, small vesicles, lysosomes, mitochondria, and various enzymes, all encased within the axolemma, the plasma membrane of the axon.
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The straight or branched structure formation of actin filaments is controlled by nucleating proteins such as the formins and Arp2/3 complex. Formin-mediated assembly results in straight filaments, whereas Arp2/3 protein complex-mediated assembly results in branched actin filaments.
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Related Experiment Video

Updated: Sep 5, 2025

Measuring Properties of the Membrane Periodic Skeleton of the Axon Initial Segment using 3D-Structured Illumination Microscopy 3D-SIM
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A Synthetic Minimal Beating Axoneme.

Isabella Guido1, Andrej Vilfan1,2, Kenta Ishibashi3,4

  • 1Max Planck Institute for Dynamics and Self-Organization (MPIDS), 37077, Göttingen, Germany.

Small (Weinheim an Der Bergstrasse, Germany)
|July 11, 2022
PubMed
Summary
This summary is machine-generated.

Researchers engineered a synthetic beating structure using axonemal dynein and microtubules, creating a nanoscale bio-molecular machine that mimics cilia-like beating and fluid transport.

Keywords:
axonemal dyneinbioinspired synthesismicrotubulesmolecular self-assemblyreconstituted axonemes

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Area of Science:

  • Biophysics
  • Nanotechnology
  • Molecular Biology

Background:

  • Cilia and flagella are essential organelles for cellular and organismal motility.
  • Axonemal dynein is the molecular motor responsible for the beating motion of cilia and flagella.
  • Replicating ciliary beating in synthetic systems remains a significant scientific challenge.

Purpose of the Study:

  • To engineer a synthetic beating system capable of mimicking natural ciliary motion.
  • To understand the fundamental mechanisms driving nanoscale biological movement.

Main Methods:

  • Bottom-up engineering of a synthoneme composed of microtubules and axonemal dynein.
  • Development of a computational model to analyze motor-microtubule interactions.

Main Results:

  • Successfully constructed a sustained beating synthoneme with periodic arrays of axonemal dynein.
  • The model elucidated motion via cooperative, cyclic motor-microtubule binding and unbinding.
  • The engineered system demonstrated cilia-like beating properties at the nanoscale.

Conclusions:

  • The engineered synthoneme represents a self-organized biomolecular machine.
  • This work provides insights into constructing artificial motile systems.
  • The findings contribute to the field of synthetic biology and nanoscale engineering.