Surface antigen of Mycobacterium tuberculosis

The term "Surface antigens of Mycobacterium tuberculosis" refers to the diverse group of proteins, polysaccharides, and glycolipids exposed on the cell envelope, capsule, and secreted from the bacterium Mycobacterium tuberculosis (Mtb)[1][2][3][5]. These antigens include proteins like OmpA, PE-PGRS, PTRP, ESAT-6, and PstS1; polysaccharides such as α-glucan and arabinomannan (AM); and glycolipids such as lipoarabinomannan (LAM) and trehalose dimycolate[2][3][4][5][6]. They play crucial roles in Mtb virulence, immune evasion, and facilitating uptake by host cells. Antibodies targeting these antigens can promote bacterial clearance via opsonization and antibody-dependent cellular phagocytosis, and some surface antigens serve as promising vaccine candidates and diagnostic markers. However, the full repertoire of protective surface antigens remains incompletely defined, and the broad categorization as "surface antigens" is inaccurate as a specific molecular therapeutic target[1][2][5]. For drug or vaccine targeting, precise identification at the molecular level (e.g., ESAT-6, OmpA, PstS1, LAM) is essential.

Other names

Mycobacterium tuberculosis surface antigensMtb cell envelope antigensMtb surface proteinsMtb capsule antigens

Antibody opsonization (promoting phagocytosis via Fc receptor-mediated uptake); Inhibition of antigen presentation (e.g., ESAT-6 complex sequestering β2M and inhibiting MHC-I expression); Direct inhibition of bacterial growth; Modulation of immune cell activation (via antibody- and antigen-mediated signaling)