Bacterial peptidoglycan glycan chain (PG glycan)

Bacterial peptidoglycan glycan chains are the fundamental carbohydrate backbone of the bacterial cell wall, composed of alternating N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM) residues (1). These residues are connected via beta-1,4-glycosidic bonds, forming long linear strands that provide the structural framework for the bacterial sacculus (2). The primary biological function of these glycan chains is to withstand high internal osmotic pressure, preventing the cell from bursting, while also determining the specific morphology of the bacterium (3). In the context of infectious disease, the integrity of these chains is vital for bacterial survival and pathogenesis (4). Therapeutic strategies often focus on disrupting the assembly of these chains; for instance, moenomycin-class antibiotics bind to and inhibit the glycosyltransferase domain of penicillin-binding proteins, preventing glycan chain elongation (5). Additionally, the human innate immune system utilizes lysozyme to hydrolyze the glycosidic bonds within the glycan chain, effectively lysing the bacterial cell (6). Because this molecular structure is absent in humans, it remains one of the most successful and selective targets for antibiotic development (7). (1) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2857188/ (2) https://pubmed.ncbi.nlm.nih.gov/16262468/ (3) https://www.nature.com/articles/nrmicro2815 (4) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2871281/ (5) https://pubchem.ncbi.nlm.nih.gov/compound/Moenomycin-A (6) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5395544/ (7) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3135033/

Other names

Murein glycanPeptidoglycan backboneNAG-NAM polymerBacterial cell wall polysaccharide

Inhibition of peptidoglycan glycosyltransferase (transglycosylation) to prevent chain elongation and enzymatic hydrolysis of beta-1,4-glycosidic bonds to degrade existing chains.