IscR-mediated morphological regulation confers virulence and stress resistance by reducing stress molecule uptake in Acinetobacter baumannii.

IscR-driven morphological shift to coccoid form enhances A. baumannii virulence and stress resistance by reducing stress molecule uptake during infection.

• Why it matters: Understanding how A. baumannii adapts to immune and antibiotic stresses is crucial for developing new treatments against this multidrug-resistant pathogen.
• What they did: The study used genetic and morphological analyses to show that IscR upregulates mrcA, causing a rod-to-coccoid transition that decreases surface area and stress molecule absorption under oxidative and antibiotic stress.
• The result: This morphological regulation improves bacterial survival in host immune cells and animal models, suggesting that targeting shape remodeling could enhance antimicrobial strategies.