Nanoscale imaging of Bacillus thuringiensis flagella using atomic force microscopy

Area of Science:

• Microbiology
• Bacteriology
• Biophysics

Background:

• Bacterial flagella are crucial for motility, adhesion, and host interactions.
• Understanding flagella expression is key to studying bacterial function.
• Assessing bacterial cell surface appendages requires advanced imaging techniques.

Purpose of the Study:

• To investigate bacterial flagella using atomic force microscopy (AFM).
• To compare AFM in air versus liquid for bacterial surface imaging.
• To correlate flagella expression with bacterial motility in Bacillus thuringiensis.

Main Methods:

• Utilized atomic force microscopy (AFM) in air and liquid.
• Examined two wild-type and four mutant strains of Bacillus thuringiensis.
• Quantified bacterial flagella density and dimensions at the nanoscale.

Main Results:

• AFM in air provided a simple, reliable method for observing bacterial morphology and flagella.
• Nanoscale flagella expression correlated with microscopic swarming motility.
• Established a link between flagella visualization and bacterial function.

Conclusions:

• AFM in air is a powerful tool for assessing bacterial flagella and surface properties.
• This technique offers rapid phenotypic characterization for genetic studies.
• Provides novel insights into flagella expression in gram-positive bacteria.