Bacterial peptidoglycan precursor

The bacterial peptidoglycan precursor refers to cytoplasmic and membrane-anchored intermediates (notably UDP-N-acetylmuramyl pentapeptide and Lipid II) involved in the biosynthesis of peptidoglycan, the mesh-like component giving structure and osmotic protection to most bacterial cell walls[1][2][3][5][8]. These precursors are sequentially synthesized in the cytoplasm and at the membrane: muramyl pentapeptide is first formed in the cytoplasm, then attached to a membrane carrier lipid (bactoprenol) to form Lipid I and Lipid II, which is transported and polymerized into the cell wall[1][2][3][8]. Inhibiting the synthesis, modification, or incorporation of these precursors leads to bacterial death, making them a critical target for multiple antibiotic classes such as beta-lactams and glycopeptides[1][2][3]. Because peptidoglycan is absent in mammalian cells, drugs targeting its biosynthetic precursors generally have selective toxicity for bacteria[1][3][5]. Resistance can arise through modification of precursor structures, reduced conversion, or altered uptake.

Other names

Peptidoglycan biosynthesis intermediatePeptidoglycan monomerLipid IIUDP-N-acetylmuramyl pentapeptidePark's nucleotideBacterial cell wall precursor

Inhibition of transpeptidase/transglycosylase (beta-lactams); Inhibition of precursor synthesis enzymes (e.g., MurA by fosfomycin); Inhibition of D-Ala-D-Ala ligase (e.g., D-cycloserine); Inhibition of precursor translocation (e.g., bacitracin)