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Glycobiology, Vol 8, 113-120, Copyright © 1998 by Society for Glycobiology


ORIGINAL ARTICLES

Mycobacterial lipoarabinomannan: an extraordinary lipoheteroglycan with profound physiological effects

D Chatterjee and KH Khoo
Department of Microbiology, Colorado State University, Fort Collins 80523, USA.

Detailed structural and functional studies over the last decade have led to current recognition of the mycobacterial lipoarabinomannan (LAM) as a phosphatidylinositol anchored lipoglycan with diverse biological activities. Fatty acylation has been demonstrated to be essential for LAM to maintain its functional integrity although the focus has largely been on the arabinan motifs and the terminal capping function. It has recently been shown that the mannose caps may be involved not only in attenuating host immune response, but also in mediating the binding of mycobacteria to and subsequent entry into macrophages. This may further be linked to an intracellular trafficking pathway through which LAM is thought to be presented by CD1 to subsets of T-cells. The implication of LAM as major histocompatibility complex (MHC)-independent T-cell epitope and the ensuing immune response is an area of intensive studies. Another recent focus of research is the biosynthesis of arabinan which has been shown to be inhibitable by the anti- tuberculosis drug, ethambutol. The phenomenon of truncated LAM as synthesized by ethambutol resistant strains provides an invaluable handle for dissecting the array of arabinosyltransferases involved, as well as generating much needed structural variants for further structural and functional studies. It is hoped that with more systematic investigations based on clinical isolates and human cell lines, the true significance of LAM in the immunopathogenesis of tuberculosis and leprosy can eventually be explained.
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M. Gilleron, C. Ronet, M. Mempel, B. Monsarrat, G. Gachelin, and G. Puzo
Acylation State of the Phosphatidylinositol Mannosides from Mycobacterium bovis Bacillus Calmette Guerin and Ability to Induce Granuloma and Recruit Natural Killer T Cells
J. Biol. Chem., September 7, 2001; 276(37): 34896 - 34904.
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