Host cell surface sialic acid receptor

Host cell surface sialic acid receptors are terminal sialic acid residues found on cell-surface glycoconjugates, including glycoproteins, glycolipids, and proteoglycans, prominently located at the outermost positions of membrane-associated carbohydrates[1][2][4][5][6]. These receptors are highly exposed on the plasma membrane and play a crucial role in normal physiological processes such as cellular recognition, cell–cell adhesion, and modulation of immune responses. Importantly, they serve as critical attachment and entry points for many pathogenic viruses, such as influenza viruses (which bind α2,3- or α2,6-linked sialic acids depending on their host specificity) and some coronaviruses (which bind to sialylated structures for initial host cell recognition)[5][3][6]. Alterations in patterns of sialylation are involved in cancers (facilitating metastasis by changing cell adhesion), inflammation, and can serve as biomarkers for disease. Drugs such as neuraminidase inhibitors do not directly bind these host receptors but block the viral enzyme that interacts with them during infection. The molecular entity is not a single protein or defined molecule but a structural motif found on various glycoconjugates; "Host cell surface sialic acid receptor" is thus a functional, not a single canonical, target and should not be mistaken for an individual receptor gene or protein[5][6].

Other names

Sialic acid receptorSialylated glycan receptorCell surface sialic acidSialylated glycoprotein receptor

Inhibition of viral neuraminidase prevents cleavage of sialic acid, blocking viral release and spread. Blocking viral attachment to sialylated receptors on host cells.