The bacterial flagellum as an object for optical trapping

Ilya V Konyshev ^1,2, Andrey A Byvalov ^1,2

⁰Institute of Physiology of the Federal Research Centre, Komi Science Centre, Ural Branch of the Russian Academy of Sciences, Syktyvkar, 167982 Russia.

Biophysical Reviews +

|

September 23, 2024

View abstract on PubMed

Summary

Optical trapping offers a novel method to investigate microbial flagellum structure and function. This technique uses laser light to manipulate and study bacterial motility, with considerations for cell viability.

Area Of Science

Microbiology and Biophysics
Optical Physics
Cellular Mechanics

Background

Microbial flagella are complex organelles essential for bacterial motility.
Understanding flagellar structure and function is crucial for microbiology and medicine.
Existing methods for studying flagella have limitations in precision and non-invasiveness.

Purpose Of The Study

To explore the potential of optical trapping for studying microbial flagellum structure and function.
To model bacterial cell movement in liquid media using optical trapping principles.
To assess the feasibility and challenges of using optical tweezers for flagellar research.

Main Methods

Description of a typical gram-negative bacterium flagellum structure.
Application of a mathematical model for ellipsoidal cell movement in a fluid.
Explanation of optical trapping principles, including light pressure and gradient force.
Discussion of thermal damage risks to microscopic cells from laser focus.

Main Results

The study models bacterial cell movement using established physical principles.
Optical trapping principles are clarified for manipulating microscopic biological samples.
The nonlinear dependence of cell damage probability on laser wavelength is identified.

Conclusions

Optical trapping presents a promising tool for investigating microbial flagella.
Model systems for studying both free and surface-tethered bacteria are proposed.
Further research can optimize optical trapping parameters to minimize cell damage.

Keywords:

Adhesion Bacterium Flagellum Mathematical models Optical trap Rotation