Peptidoglycan (bacterial cell wall)

The bacterial cell wall is a rigid, protective structure primarily composed of **peptidoglycan**, a mesh-like polymer of alternating N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM) units cross-linked by short peptide bridges[2][3][4][5]. This structure determines bacterial shape, prevents osmotic lysis, and is essential for viability[1][7][11]. Gram-positive bacteria have thick peptidoglycan layers with teichoic acids, while gram-negative bacteria have thin peptidoglycan surrounded by an outer membrane containing lipopolysaccharide[1][6][12][14]. Cell wall synthesis and remodeling involve numerous enzymes (Mur family, penicillin-binding proteins), many of which are validated antibiotic targets due to their essential roles in growth and division[9][4][11]. Therapeutic targeting of the cell wall or its biosynthetic proteins remains a cornerstone of antibacterial therapy, but clinical efficacy is challenged by resistance and drug hypersensitivity. Note: For structured information, "Peptidoglycan (bacterial cell wall)" is correct only if referring to the wall's polymeric structure. For a protein target, specify the protein (e.g., Penicillin-binding protein 2). "Bacterial cell wall/protein" as written is overly broad and should be clarified for data interoperability.

Other names

Bacterial cell wallmurein (for peptidoglycan)wall-associated proteins (not a formal alias, see note)

Inhibition of cell wall (peptidoglycan) biosynthesis (by blocking transpeptidase or other biosynthetic enzymes) Disruption of cell wall structure, leading to osmotic lysis and cell death[4][7][9]