Profiling the Bordetella pertussis proteome during iron starvation

Area of Science:

• Microbiology
• Proteomics
• Bacterial Pathogenesis

Background:

• Iron is essential for bacterial growth, and pathogens like Bordetella pertussis adapt to iron-limited environments during infection.
• Understanding how Bordetella pertussis regulates gene expression in response to iron availability is crucial for developing effective treatments.

Purpose of the Study:

• To investigate the differential protein expression of Bordetella pertussis under iron-limited conditions using a proteomic approach.
• To identify novel iron-regulated proteins that may contribute to the increased virulence of Bordetella pertussis.

Main Methods:

• Proteomic analysis of Bordetella pertussis whole cell lysates and outer membrane fractions under iron-excess and iron-starvation conditions.
• Two-dimensional (2-D) gel electrophoresis followed by tryptic digestion and MALDI-TOF MS for protein identification.

Main Results:

• Differential expression of 36 proteins was observed, with 27 proteins showing increased expression under iron-starvation.
• Identification of previously unreported low-iron-induced proteins.
• Discovery of at least one highly immunogenic protein exclusively expressed under iron starvation.

Conclusions:

• Iron limitation significantly impacts the proteome of Bordetella pertussis, inducing specific proteins potentially linked to virulence.
• The identification of novel, immunogenic proteins under iron starvation provides potential targets for therapeutic and diagnostic strategies against whooping cough.