Poly-N-acetyllactosamine epitope (poly-LacNAc)

Poly-N-acetyllactosamine epitope refers to a repeating glycan structure composed of [-Galβ(1,4)-GlcNAcβ(1,3)-]ₙ units. This epitope is found as an extension/modification on both N- and O-linked glycoproteins and glycolipids, and is the product of sequential action by glycosyltransferases such as β1,3-N-acetylglucosaminyltransferases and β1,4-galactosyltransferases[1][2][3][9]. Poly-LacNAc chains function as scaffolds for further modification, forming key epitopes for blood group antigens and sialyl Lewis antigens, and they play central roles in biological processes involving cell adhesion, immune modulation, and development. They act as ligands for galectins and selectins, mediating cell-cell interactions important for leukocyte trafficking and tumor cell metastasis[4][5]. The "epitope" itself is not a protein, receptor, or enzyme and is not targeted by drugs directly, but rather mediates biological function by interacting with various glycan-binding proteins. **Note:** The queried entity is a glycan epitope and not a conventional molecular target such as a receptor, enzyme, or transporter. Therefore, it is not typically considered a "therapeutic target" and lacks associated drugs or direct mechanisms of action common to protein targets. The entry is "incorrect" in conventional drug-target nomination contexts, but the epitope is highly relevant as a **ligand** for proteins mediating biological recognition.

Other names

poly-N-acetyllactosaminepoly-LacNAcpLNpoly(N-acetyllactosamine)poly N-acetyllactosamine (various spacings/hyphenations)polylactosamine