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Mechanism of Ciliary Motion

Mechanism of Ciliary Motion

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.
The cilia are made up of microtubules in a 9+2 arrangement, with nine microtubule doublet ring bundles, surrounding a pair of central singlet microtubule bundles. The doublet microtubule bundles are...

Mechanism of Ciliary Motion

Mechanism of Ciliary Motion

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.
The cilia are made up of microtubules in a 9+2 arrangement, with nine microtubule doublet ring bundles, surrounding a pair of central singlet microtubule bundles. The doublet microtubule bundles are...

Rise of Liquid in a Capillary Tube

Rise of Liquid in a Capillary Tube

When very thin cylindrical tubes, called capillaries, are dipped in a liquid, the liquid rises or falls in the tube compared to the surrounding liquid. This phenomenon is called capillary action. Capillary action occurs due to the combination of two opposing forces: the cohesive forces of the liquid, which cause it to stick to itself and form a rounded shape, and the adhesive forces between the liquid and the walls of the container, which cause the liquid to be attracted to the container walls.

Deriving the Speed of Sound in a Liquid

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Two Components: Liquid–Liquid Systems

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A pressure-composition phase diagram explicitly describes the behavior of an ideal solution of two volatile liquids under varying pressures and compositions. A pressure-composition diagram has two main curves. The bubble point curve represents the plot of pressure versus liquid mole fraction. It indicates the pressure at which the first bubble of vapor forms from the liquid phase as the system pressure decreases.The dew point curve is the pressure versus vapor mole fraction. It indicates the...

Cell Motility through Blebbing

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Related Experiment Video

Updated: May 10, 2026

Glass-Based Devices to Generate Drops and Emulsions

Glass-Based Devices to Generate Drops and Emulsions

Published on: April 5, 2022

A liquid engine: How Spef1 droplets set the ciliary beat.

Kishore K Mahalingan¹

¹Precision Health Program, Department of Pharmacology and Toxicology, College of Human Medicine, Michigan State University, East Lansing, MI, USA.

Structure (London, England : 1993)

|May 8, 2026

Summary

This summary is machine-generated.

Microtubule-associated protein Spef1 forms dynamic condensates through liquid-liquid phase separation. These Spef1 condensates drive central-pair microtubule assembly, explaining ciliary beating mechanisms.

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Area of Science:

Cell Biology
Structural Biology
Biochemistry

Background:

Microtubules are crucial cytoskeletal components involved in various cellular processes.
The assembly of central-pair microtubules (CP-MTs) is essential for ciliary function but remains mechanistically unclear.
Microtubule-associated proteins (MAPs) play regulatory roles in microtubule dynamics.

Purpose of the Study:

To elucidate the mechanism underlying central-pair microtubule (CP-MT) assembly.
To investigate the role of the microtubule-associated protein Spef1 in CP-MT formation.
To understand the biophysical properties of Spef1 and its interactions.

Main Methods:

Biochemical assays to study protein-protein interactions.
In vitro reconstitution of microtubule assembly.
Advanced microscopy techniques to visualize condensate formation and dynamics.
Structural analysis of the Spef1 coiled-coil domain.

Main Results:

Spef1 undergoes liquid-liquid phase separation (LLPS) driven by its charged coiled-coil domain.
Spef1 forms dynamic condensates that recruit and concentrate tubulin.
These Spef1-tubulin condensates promote the assembly of central-pair microtubules.
The findings provide a mechanistic link between Spef1 LLPS and CP-MT formation.

Conclusions:

Spef1-mediated LLPS is a key mechanism for regulating CP-MT assembly.
Dynamic Spef1 condensates serve as scaffolds for efficient tubulin polymerization.
This study offers a novel explanation for the formation of CP-MTs and their role in planar ciliary beating.