"' Peptidoglycan "', also known as "'murein "', is a polymer consisting of sugars and amino acids that forms a mesh-like layer outside the plasma membrane of most bacteria, forming the cell wall.
12.
A periplasmic binding protein, MppA, essential for the uptake of the cell wall murein tripeptide, L-alanyl-?-D-glutamyl-" meso "-diaminopimelate via the Opp permease, regulates " mar " regulon expression.
