Mycobacterium leprae outer membrane

The **Mycobacterium leprae outer membrane** is a specialized lipid bilayer structure forming part of the unique cell envelope characteristic of mycobacteria. This "mycomembrane" consists primarily of very-long-chain fatty acids known as mycolic acids, which form its inner leaflet, while its outer leaflet contains various non-covalently linked lipids and glycolipids[2][3]. The presence and organization of this lipid-rich barrier are thought to contribute significantly to *M. leprae*'s natural resistance to many antibiotics and chemotherapeutic agents by restricting their entry into the bacterial cell[1][2]. Structurally, it is analogous in function—but not in composition—to the outer membranes found in Gram-negative bacteria. While some proteins are associated with transport across this barrier in related species (*e.g.*, MmpL family proteins), there is no evidence that the "outer membrane" itself constitutes a single therapeutic target such as an enzyme or receptor. Instead, it represents a complex structural feature essential for bacterial survival and pathogenicity but not typically targeted directly by drugs[1][2]. Notably, there are no standard abbreviations or alternative names specific only to *M. leprae*'s version; terms like "mycomembrane" or "outer mycolate layer" apply broadly across pathogenic mycobacteria including *M. tuberculosis*[3]. There is also some uncertainty about whether all detailed features described for other species fully apply to *M. leprae*, given differences observed at ultrastructural levels[3][4]. Because this term refers to an entire structural component rather than a discrete protein or receptor molecule—and because it does not represent a direct therapeutic target—the entry should be flagged as potentially incorrect if used where individual molecular targets are required. > The recent advent of cryoelectron microscopy has confirmed that the ‘lipid barrier’, or ‘outer mycolate layer’, is indeed a bona fide mycobacterial outer membrane... Although this exciting development applies mainly to M. tuberculosis... we expect likewise for M. leprae.[3]

Other names

Mycobacterial outer membraneMycomembrane (in context of mycobacteria)Outer mycolate layer