Temporal proteomic profiling reveals changes that support Burkholderia biofilms

Area of Science:

• Microbiology
• Proteomics
• Bacterial Pathogenesis

Background:

• Melioidosis, caused by Burkholderia pseudomallei, poses a significant health burden in Southeast Asia and Australia.
• Current treatments for B. pseudomallei infections are limited, especially for drug-resistant strains and bacteria in biofilms.
• Biofilm bacteria exhibit altered phenotypes and reduced susceptibility to antimicrobial therapies compared to planktonic forms.

Purpose of the Study:

• To investigate the temporal proteomic differences between planktonic and biofilm forms of Burkholderia thailandensis, a surrogate model for B. pseudomallei.
• To understand the molecular mechanisms underlying biofilm survival and antibiotic tolerance in Burkholderia species.

Main Methods:

• Utilized reverse-phase liquid chromatography tandem mass spectrometry (LC-MS/MS) for proteomic analysis.
• Compared protein abundance profiles between planktonic and biofilm states of B. thailandensis.
• Analyzed genomic similarity between B. thailandensis and B. pseudomallei.

Main Results:

• Proteomic analysis revealed decreased abundance of metabolic proteins and increased abundance of stress-related proteins in biofilms, supporting survival.
• Identified specific proteins, including TEX, TolB, and exopolyphosphatase, with altered abundance in biofilms.
• Observed proteomic adaptations in biofilms that contribute to non-specific antibiotic tolerance.

Conclusions:

• B. thailandensis biofilm formation involves significant proteomic shifts that enhance survival and antibiotic tolerance.
• Understanding these proteomic differences is crucial for developing novel therapeutic strategies against Burkholderia infections.
• This study provides insights into the molecular basis of antimicrobial resistance in bacterial biofilms.