Enterobacterial virulence biosynthesis pathway

The Enterobacterial virulence biosynthesis pathway encompasses a variety of metabolic routes essential for the survival, proliferation, and pathogenicity of Enterobacteriaceae within a host environment (Raymond et al., 2003). A central component of this pathway is the production of siderophores, such as enterobactin and salmochelin, which are high-affinity iron-chelating molecules that allow bacteria to scavenge iron from host proteins like transferrin and lactoferrin (Miethke & Marahiel, 2007). Additionally, the pathway includes the biosynthesis of lipopolysaccharides (LPS), which are critical for the structural integrity of the outer membrane and serve as a major barrier against host immune responses and antibiotics (Raetz & Whitfield, 2002). Some members of this bacterial family also utilize the pathway to synthesize genotoxins like colibactin, which can induce DNA damage in host cells and contribute to colorectal cancer (Nougayrède et al., 2006). Therapeutic strategies targeting these pathways focus on disarming the pathogen rather than directly killing it, which may reduce the selective pressure for the development of antibiotic resistance (Dickey et al., 2017). For instance, siderophore-antibiotic conjugates like Cefiderocol utilize the bacterial iron-uptake machinery to transport antibiotics across the outer membrane, effectively bypassing traditional resistance mechanisms (Zhanel et al., 2019). Other experimental approaches involve the inhibition of LpxC, an enzyme essential for Lipid A biosynthesis, to disrupt the formation of the bacterial cell wall (Tomaras et al., 2014). Despite their potential, challenges remain, including the redundancy of iron acquisition systems and the potential for off-target effects on the host's commensal microbiome.

Other names

Bacterial virulence factor biosynthesisSiderophore biosynthesis pathwayLipopolysaccharide (LPS) biosynthesis pathwayColibactin biosynthesis pathwayEnterobacterial metabolic virulence targets

Inhibition of LpxC enzyme to disrupt LPS biosynthesis; Siderophore-mediated antibiotic delivery (Trojan horse mechanism); Inhibition of siderophore biosynthesis enzymes (e.g., EntE); Competitive inhibition of iron uptake by gallium ions.