AI Insight
Murepavadin, previously known as a Pseudomonas-specific antibiotic targeting the LPS transport protein LptD, has been discovered to function as a broad-spectrum outer membrane permeabilizer. The drug binds to lipid A in the outer membrane of Gram-negative bacteria, causing membrane disruption that allows it to enter the periplasm and reach its target. This membrane-disrupting effect occurs across diverse Gram-negative species, increasing their susceptibility to other antibiotics and to the complement system of the host immune response.
Why it matters
This finding suggests murepavadin could be repurposed as a combination therapy agent to enhance the effectiveness of existing antibiotics against multiple Gram-negative pathogens, not just Pseudomonas. The discovery that it also sensitizes bacteria to immune defenses could improve treatment outcomes for infections involving antibiotic-resistant Gram-negative bacteria.
⚠️ Preprint – Noch nicht peer-reviewed
Dieser Artikel wurde noch nicht von unabhängigen Experten begutachtet. Die Ergebnisse sind vorläufig und sollten mit Vorsicht interpretiert werden.
Murepavadin is a Pseudomonas-specific antibiotic that targets LPS transport protein LptD. However, whilst the mode of action of murepavadin is well defined, the mechanism by which the drug gains access to LptD remains unresolved. Here, we demonstrate a self-directed uptake mechanism for murepavadin, whereby binding to lipid A induces outer membrane disruption, enabling entry of the antibiotic into the periplasm and access to LptD. Murepavadin-LPS interactions were not specific to P. aeruginosa, however, and were found to cause OM disruption across a wide range of Gram-negative bacteria, resulting in increased antibiotic susceptibility. We also discovered that murepavadin-mediated OM disruption sensitised E. coli to the membrane attack complex of the complement system. In conclusion, murepavadin is a broad-spectrum membrane permeabiliser, which results in increased bacterial susceptibility to antibiotics and host defences.
Source: Murepavadin is a broad-spectrum outer membrane permeabiliser