Mycobacterial cell envelope lipids

Mycobacterial cell envelope lipids are a complex and unique set of lipid molecules that constitute the outer membrane, or mycomembrane, of Mycobacteria species, including Mycobacterium tuberculosis (Brennan, 2003, PMID: 14551230). These lipids, most notably mycolic acids, are long-chain fatty acids that provide a dense, waxy barrier, making the bacteria highly resistant to environmental stress, chemical disinfectants, and many common antibiotics (Nikaido, 2003, PMID: 12624055). Beyond their structural role, these lipids act as potent virulence factors that modulate the host's immune response, allowing the pathogen to survive within macrophages (Gilleron et al., 2008, PMID: 18463157). Targeting the biosynthesis of these lipids is a cornerstone of tuberculosis therapy, as seen with drugs like isoniazid and ethionamide which inhibit the enoyl-ACP reductase InhA, a key enzyme in mycolic acid production (Vilchèze & Jacobs, 2007, PMID: 17661707). Disruption of this lipid layer leads to increased cell permeability and bacterial death. Understanding the diversity of these lipids is crucial for developing new diagnostics, such as the detection of lipoarabinomannan (LAM) in urine, and therapeutic strategies against mycobacterial infections (Peter et al., 2012, PMID: 22410214).

Other names

Mycobacterial cell wall lipidsMycomembrane lipidsMycolic acidsMycobacterial glycolipidsLipoarabinomannanTrehalose dimycolate

Inhibition of mycolic acid biosynthesis (e.g., via InhA inhibition) and disruption of the assembly of the mycobacterial mycomembrane.