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N-Acetylglucosamine (N-acetyl-D-glucosamine, or GlcNAc, or NAG) is a monosaccharidederivative of glucose. It is an amide between glucosamine and acetic acid. Ithas a molecular formula of C8H15NO6, a molar mass of 221.21 g/mol, and it is significant inseveral biological systems.
It is part of a biopolymer in the bacterialcell wall, built from alternating units of GlcNAc and N-acetylmuramic acid(MurNAc), cross-linked with oligopeptides at the lactic acid residue of MurNAc.This layered structure is called peptidoglycan (formerly called murein).
GlcNAc is the monomeric unit of the polymerchitin, which forms the outer coverings of insects and crustaceans. It is themain component of the cell walls of fungi, the radulas of mollusks, and thebeaks of cephalopods.
Polymerized with glucuronic acid, it formshyaluronan.
It has been proposed as a treatment for autoimmunediseases,[1] and recent tests have claimed some success.
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