Acinetobacter baumannii peptidoglycan (PG)

Acinetobacter baumannii peptidoglycan is a vital structural polymer that forms the cell wall of this Gram-negative bacterium, providing the mechanical strength necessary to withstand internal osmotic pressure and maintain cell shape (Vollmer et al., 2008). It is composed of alternating N-acetylglucosamine and N-acetylmuramic acid residues, cross-linked by short peptide chains containing meso-diaminopimelic acid. In clinical medicine, this structure is the primary target for beta-lactam antibiotics, which interfere with the cross-linking process by binding to penicillin-binding proteins (PBPs) (Penwell et al., 2015). A. baumannii is a significant nosocomial pathogen, often exhibiting multi-drug resistance through the production of beta-lactamases and modifications to its peptidoglycan synthesis machinery (Iraz et al., 2015). Understanding the dynamics of peptidoglycan assembly and recycling is essential for developing new therapeutic interventions against carbapenem-resistant strains.

Other names

MureinBacterial cell wallA. baumannii cell wall peptidoglycanPeptidoglycan layer

Drugs targeting this molecule typically inhibit the final stages of peptidoglycan synthesis by binding to and inactivating Penicillin-Binding Proteins (PBPs), which are transpeptidase enzymes responsible for cross-linking the peptidoglycan strands (Peleg et al., 2008). This inhibition weakens the cell wall, leading to bacterial cell lysis due to internal osmotic pressure (Vollmer et al., 2008).