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Related Experiment Video

Updated: Jun 12, 2026

Biophysical Characterization of Flagellar Motor Functions

Biophysical Characterization of Flagellar Motor Functions

Published on: January 18, 2017

Nonlinear amplitude dynamics in flagellar beating.

David Oriola¹, Hermes Gadêlha², Jaume Casademunt¹

¹Departament de Física de la Matèria Condensada, Facultat de Física , Universitat de Barcelona , Avinguda Diagonal 647, 08028 Barcelona, Spain.

Royal Society Open Science

|April 14, 2017

Summary

This summary is machine-generated.

This study reveals how dynein motor proteins control flagellar beating dynamics. It uncovers a novel mechanism for how unstable bending modes naturally stabilize, explaining flagellar oscillation amplitudes.

Keywords:

dynein flagellar beating self-organization spermatozoa

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Area of Science:

Biophysics
Cell Biology
Mechanobiology

Background:

Flagellar and ciliary beating are crucial for motility but their physical basis remains incompletely understood.
The axoneme, composed of microtubules and dynein motor proteins, generates bending waves through complex interactions.

Purpose of the Study:

To investigate the nonlinear dynamics of flagellar beating.
To assess the role of dynein motor proteins in the nonlinear nature of the axoneme.
To explore a dynein-based sliding control mechanism for flagellar oscillations.

Main Methods:

Developed a mathematical model incorporating an axonemal sliding control mechanism for dynein activity.
Derived and numerically solved a set of nonlinear equations describing flagellar dynamics.
Analyzed spatio-temporal dynamics of dynein populations and flagellum shape under varying conditions.

Main Results:

The model successfully reproduces nonlinear selection of oscillation amplitudes, often prescribed in other models.
Identified distinct dynamic regimes based on motor activity, viscosity, and elasticity.
Demonstrated that unstable modes saturate through the coupling of dynein kinetics and flagellum shape.

Conclusions:

A novel mechanism for the saturation of unstable modes in axonemal beating was revealed.
Dynein activity and flagellar mechanics are intrinsically linked in generating stable bending patterns.
This work provides new insights into the self-organization principles underlying ciliary and flagellar function.