Mycobacterial cell wall peptidoglycan (PG)

Mycobacterial cell wall peptidoglycan is a covalently cross-linked heteropolymer consisting of linear glycan strands (composed of N-acetylglucosamine and N-acetylmuramic acid) cross-linked by peptide chains, forming a mesh-like exoskeleton that preserves cell integrity, protects against osmotic lysis, and serves as the scaffold for attachment of arabinogalactan and mycolic acids in Mycobacterium tuberculosis and related species. This component is essential for viability and division of the bacilli, and its biosynthetic enzymes are validated therapeutic targets for current and future anti-tuberculosis drug discovery. Inhibiting peptidoglycan synthesis leads to cell death, and numerous antibiotics (notably β-lactams and cycloserine) target this structure or its assembly pathway. The unique architecture and chemical modifications of mycobacterial peptidoglycan contribute to both drug resistance and immune evasion, making it an "Achilles' heel" but also a therapeutic challenge in combating tuberculosis.

Other names

Peptidoglycan (PG)MureinMycolyl-arabinogalactan-peptidoglycan complex (as part of the larger complex – not a direct synonym)mAGP complex (context-specific, refers to the cell wall structure housing peptidoglycan)

Inhibition of peptidoglycan biosynthesis enzymes (e.g., transpeptidases, glycosyltransferases); Disruption of cell wall cross-linking and assembly, leading to bacterial cell lysis and death