Mycobactin Synthesis Pathway (N/A)

The mycobactin synthesis pathway is a specialized biosynthetic route found exclusively in the mycolata family of actinobacteria, including Mycobacterium tuberculosis. This pathway enables these bacteria to produce mycobactins—salicyl-capped peptide siderophores—under iron-limiting conditions, enabling iron acquisition and supporting bacterial survival and virulence during infection. The pathway is a hybrid assembly line composed of nonribosomal peptide synthetases (NRPS) and polyketide synthases (PKS), involving enzymes like MbtI, MbtA, MbtB/E/F/G/K. Because humans lack homologous pathways or enzymes involved in mycobactin biosynthesis, targeting this system minimizes off-target toxicity risk while directly impairing pathogen survival mechanisms. Several small-molecule inhibitors have demonstrated potent activity against both extracellular and intracellular forms of Mycobacterium tuberculosis, validating the approach as a promising avenue for novel anti-TB therapies.

Inhibition of mycobactin synthesis