What does peptidoglycan mean?
Peptidoglycan is a strong, mesh-like polymer found in the cell walls of most bacteria. It consists of chains of alternating sugar molecules joined and cross-linked by short peptide chains, creating a durable structure that protects bacterial cells and helps them retain their shape. Because human cells do not have peptidoglycan, many antibiotics can selectively interfere with its construction or breakdown without directly damaging the cells of their host. This makes peptidoglycan an important target in medicine: for example, penicillin inhibits enzymes involved in the final stage of peptidoglycan cell-wall assembly. The term is also used more broadly for related structural polymers in some archaea. In biological and pharmaceutical writing, it usually appears in technical contexts such as bacterial cell-wall synthesis, Gram staining, antimicrobial action, and laboratory research on cell division.
nounA structural polymer that forms part of the cell wall of most bacteria, consisting of long chains of sugars cross-linked by short chains of amino acids. It gives bacterial cells strength and helps them maintain their shape.
- The polymeric material forming the main layer of most bacterial cell walls, made of sugar chains cross-linked by peptides.
- More broadly, a peptidoglycan-like structural polymer found in certain archaeal cell walls.
"Antibiotics such as penicillin disrupt peptidoglycan synthesis, weakening the bacterial cell wall."
"The bacterium produced an unusually thick layer of peptidoglycan that resisted common laboratory stains."
"Researchers studied the enzymes responsible for assembling and repairing peptidoglycan in the bacterial cell wall."
The plural is uncommon in general writing but can be used when referring to multiple distinct peptidoglycan molecules, structures, or types.
"The study compared the organization of peptidoglycans from several bacterial species."
Penicillin’s power comes from sabotaging a molecular scaffold: bacterial peptidoglycan, the mesh that keeps the cell wall standing.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does peptidoglycan come from?
The word combines the combining form “peptido-,” referring to peptides, with “glycan,” a term for a carbohydrate or sugar polymer. The scientific naming reflects the material’s structure: long sugar chains are cross-linked by peptide chains. The word developed in 20th-century microbiology as researchers described the chemical architecture of bacterial cell walls and the enzymes involved in assembling them.
How peptidoglycan is actually used
This is primarily a technical biological and medical term. It is usually used in microbiology, pharmacology, and molecular biology, particularly in discussions of bacterial cell walls and antibiotics that target cell-wall synthesis.