Cell-surface N-linked galactose-bearing glycans

Cell-surface N-linked galactose-bearing glycans are complex carbohydrate structures attached to asparagine residues of membrane proteins, characterized by terminal or repeating N-acetyllactosamine (LacNAc) units [1][2]. These glycans serve as the primary ligands for galectins, a family of proteins that cross-link glycoproteins to form functional lattices on the cell surface, thereby regulating receptor signaling and endocytosis [3][6]. In oncology, increased branching and galectin-lattice formation are associated with the suppression of T-cell activation and the promotion of metastatic potential [1][5]. Furthermore, terminal galactose residues are specifically recognized by the asialoglycoprotein receptor (ASGPR) in the liver, a mechanism extensively exploited for the targeted delivery of siRNA and antisense oligonucleotides using GalNAc-conjugates [4][9]. Therapeutic development in this space includes galectin inhibitors like Belapectin, which aim to disrupt these glycan-protein interactions to enhance immune response and reduce fibrosis [7][8]. Understanding the density and composition of these glycans is crucial for developing precision glycan-targeted therapies and diagnostic imaging agents.

Other names

N-linked galactosylated glycansGalactose-terminated N-glycansGalactosyl-glycoconjugatesLacNAc-containing N-glycansGalactose-bearing N-glycans

Competitive inhibition of galectin-glycan lattice formation and competitive blockade of lectin-binding sites on terminal galactose residues.