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Related Concept Videos

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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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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Actin is a family of globular proteins that are highly abundant in eukaryotic cells. It makes up approximately 1-5% of total cell protein concentration. Actin monomers polymerize to form a complex network of polarized filaments, the actin cytoskeleton, that plays a crucial role in many cellular processes, including cell motility, division, endocytosis, and metastasis of cancer cells.
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Biophysical Characterization of Flagellar Motor Functions
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A Structural Basis for How Motile Cilia Beat.

Peter Satir1, Thomas Heuser1, Winfield S Sale1

  • 1Peter Satir ( peter.satir@einstein.yu.edu ) is affiliated with the Department of Anatomy and Structural Biology at Albert Einstein College of Medicine, in New York, New York. Thomas Heuser is affiliated with the Electron Microscopy Facility, in the Campus Science Support Facilities of the Campus Vienna Biocenter, in Vienna, Austria. Winfield S. Sale is affiliated with the Department of Cell Biology at Emory University, in Atlanta, Georgia.

Bioscience
|March 9, 2016
PubMed
Summary
This summary is machine-generated.

The motile cilium uses dynein motor proteins to create a beat through microtubule bending. New research refines understanding of how dynein activity controls ciliary beating and bend formation.

Keywords:
axonemeciliadyneineukaryotic flagellamicrotubulesmotility

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Area of Science:

  • Cell Biology
  • Biophysics

Background:

  • The motile cilium is a complex cellular machine essential for movement.
  • Its function relies on the coordinated action of dynein motor proteins powering microtubule sliding within the axoneme.
  • The switch point hypothesis explains ciliary beating through interactions between sliding microtubules and the central apparatus.

Purpose of the Study:

  • To explore the molecular mechanisms controlling ciliary motility.
  • To refine the understanding of dynein arm activity regulation.
  • To investigate the generation and propagation of bends in the cilium.

Main Methods:

  • Utilizing Chlamydomonas mutants to study ciliary function.
  • Employing high-speed, high-resolution motion analysis.
  • Applying cryoelectron tomography for structural insights.

Main Results:

  • Recent advances have revealed significant genetic, biochemical, and structural complexity.
  • New data refine the understanding of dynein motor regulation.
  • Insights into the interplay of axonemal structures and dynein activity have been gained.

Conclusions:

  • The study highlights ongoing discoveries in the molecular control of ciliary motility.
  • Further research promises to deepen our knowledge of bend formation and propagation.
  • Understanding dynein arm switching is key to deciphering ciliary beat mechanics.