Mycolic acid biosynthesis enzymes and bacterial respiratory chain enzymes

Mycolic acid biosynthesis enzymes are essential for the formation of long-chain fatty acids (mycolic acids), which are unique and critical components of the mycobacterial cell envelope, conferring structural integrity, impermeability, resistance to antibiotics, and pathogenicity. The pathway includes type I and type II fatty acid synthase (FAS-I/FAS-II), polyketide synthase (PKS13), and accessory enzymes such as FadD32. Drugs that target these steps can disrupt cell wall formation and are central in tuberculosis therapy[1][5][7][3][9]. Bacterial respiratory chain enzymes are modular membrane complexes involved in redox reactions that generate a transmembrane proton or sodium gradient, driving ATP synthesis. They include dehydrogenases, terminal oxidases (such as cytochrome bc1, cytochrome bd), and ATP synthase. This system supports essential energy metabolism, adaptation to environmental stress, and bacterial virulence, and is a validated target for novel antibiotics, such as bedaquiline and diarylquinolines[2][8][4][6]. However, drugs must be carefully designed to avoid affecting the host's mitochondrial respiratory chain. These two enzyme groups are best considered as *families* or *pathways* with several well-defined molecular targets within each, rather than as single, uniform receptors or enzymes—requiring finer granularity for most drug discovery or database use[2][8][5][7]. If you need structured information for a specific protein (e.g., "InhA," "PKS13," "ATP synthase subunit c," "cytochrome bd oxidase"), a more granular request is recommended.

Other names

Mycobacterial fatty acid synthases (for mycolic acid pathway)Electron transport chain enzymes (for respiratory chain)Terminal oxidases (cytochrome oxidases, for respiratory chain)FAS-I, FAS-II systems (for mycolic acid biosynthesis)Cytochrome bc1, cytochrome bd oxidase, ATP synthase (for respiratory chain)

Inhibition of fatty acid or mycolic acid synthesis (e.g., InhA, FAS-II enzymes); Inhibition of electron transfer chain, blocking ATP synthesis (e.g., ATP synthase inhibitors, cytochrome oxidase inhibitors).