Ribose-5-phosphate metabolism protects E. coli from antibiotic lethality.

Area of Science:

• Microbiology and Molecular Biology
• Metabolic Engineering
• Antimicrobial Resistance

Background:

• Bacterial metabolic status significantly influences susceptibility to antibiotics.
• The pentose phosphate pathway (PPP) is crucial for cellular biosynthesis.
• Targeting metabolic nodes can enhance antibiotic efficacy.

Purpose of the Study:

• To investigate the role of ribose-5-phosphate (R5P) biosynthesis pathways in *Escherichia coli* antibiotic susceptibility.
• To identify key metabolic targets for potentiating antibiotic therapies.

Main Methods:

• Genetic manipulation of *E. coli* strains, including gene deletions (*zwf*, *talA*, *talB*, *deoB*).
• Assessment of bacterial susceptibility to antibiotics and oxidative stress.
• Analysis of R5P levels and utilization pathways (e.g., purine biosynthesis, ADP-heptose synthesis).

Main Results:

• Disruption of the oxidative PPP branch (*zwf* deletion) significantly increased antibiotic susceptibility.
• Combined disruption of oxidative and non-oxidative PPP branches (*zwf talAB* mutant) exacerbated sensitivity.
• Elevated intracellular R5P levels directly correlated with increased antibiotic-induced killing; R5P utilization restored tolerance.

Conclusions:

• The pentose phosphate pathway, specifically R5P synthesis, is a critical determinant of bacterial stress resistance and antibiotic sensitivity.
• Targeting the PPP offers a promising strategy for developing novel adjuvant therapies to enhance antibiotic potency.
• Understanding metabolic vulnerabilities can lead to effective strategies against bacterial infections.