Peptidoglycan synthesis in Staphylococcus aureus

The term "Methicillin-sensitive Staphylococcus aureus cell wall synthesis" does not refer to a single molecule, receptor, or protein, but rather to a complex cellular process centered on the **biosynthesis of peptidoglycan**, the main structural component of the Staphylococcus aureus cell wall[1][2][4]. This process mainly involves enzymes known as **penicillin-binding proteins (PBPs)**, with PBP1 and PBP2 being essential for cross-linking peptidoglycan strands[4][5]. Autolysins such as Atl mediate necessary cell wall remodeling and division[2][10]. Cell wall synthesis is a critical bacterial function, targeted by several major antibiotic classes, including β-lactams (such as methicillin and oxacillin) and glycopeptides (such as vancomycin), which collectively disrupt or inhibit peptidoglycan transformations required for cell growth and viability[3][5][7]. Modulators of peptidoglycan synthesis and associated structures, like wall teichoic acids, are also under investigation as novel antibacterial targets[6][9]. Disruption of this pathway leads to bactericidal outcomes, making the pathway (and its key enzymes) central to antibiotic therapy and resistance (notably methicillin resistance in MRSA through acquisition of alternative PBPs)[7]. Because this entry refers to a process rather than a defined target protein, for structured data, it is best mapped to the core target enzymes: *Staphylococcus aureus penicillin-binding protein 2* (PBP2) for methicillin-sensitive strains, and additionally PBP2a for methicillin resistance.

Other names

Staphylococcus aureus cell wall biosynthesisS. aureus peptidoglycan synthesisStaphylococcal cell wall synthesis

Inhibition of penicillin-binding proteins (PBPs) blocks transpeptidase activity for peptidoglycan crosslinking, causing cell lysis (β-lactams, including methicillin, oxacillin)[5][7][4]. Glycopeptides (vancomycin, telavancin) inhibit septum constriction by blocking transglycosylation during peptidoglycan synthesis[3]. Inhibition of wall teichoic acid synthesis (targocil, tunicamycin) destabilizes cell wall integrity and can resensitize bacteria to β-lactams[6][9].