Unveiling the real-time behaviour of Staphylococcus aureus through nanomotion sensing

Area of Science:

• Microbiology
• Cellular Biophysics
• Bacterial Pathogenesis

Background:

• Iron is vital for bacterial growth and motility.
• Staphylococcus aureus is a significant human pathogen.
• Understanding iron's role in S. aureus is crucial for developing new treatments.

Purpose of the Study:

• To investigate the influence of iron availability on Staphylococcus aureus behavior.
• To utilize nanomotion sensing to monitor bacterial motility in real-time.
• To compare wild-type S. aureus with a siderophore-deficient mutant under varying iron conditions.

Main Methods:

• Real-time monitoring of nanoscale bacterial motility using nanomotion sensing.
• Culturing S. aureus under iron-repleted and iron-depleted conditions.
• Phenotypic assays using optical microscopy and conventional growth methods.

Main Results:

• Distinct motility patterns were observed between wild-type and mutant S. aureus strains based on iron availability.
• Wild-type S. aureus exhibited exponential growth in the presence of iron, while the mutant's growth was suspended.
• Both strains displayed coordinated oscillations at specific frequencies in the presence of iron, potentially linked to unique behaviors.

Conclusions:

• Nanomotion sensing is a powerful tool for studying cellular vibrations and bacterial activity.
• Iron homeostasis significantly affects S. aureus motility and growth.
• The iron intake pathway presents a promising target for novel antibacterial development.