Cellular attachment co-receptor

Cellular attachment co-receptors are a heterogeneous class of cell surface molecules, including both proteins and complex carbohydrates, that assist primary receptors in facilitating the attachment and entry of pathogens into host cells. These molecules, such as heparan sulfate proteoglycans, sialic acids, and specific chemokine receptors like CCR5 or CXCR4, often function by increasing the local density of viral or bacterial particles on the cell surface, thereby promoting interactions with high-affinity entry receptors. In many viral infections, including HIV-1 and SARS-CoV-2, the presence and density of these co-receptors are major determinants of viral tropism and infection efficiency. Therapeutic targeting of these molecules aims to prevent the initial stages of infection, using agents like small molecule antagonists (e.g., maraviroc) or polyanionic polymers (e.g., iota-carrageenan) that interfere with the binding interface. However, because these co-receptors often participate in vital physiological processes such as immune cell trafficking and cell-matrix interactions, drug development must address potential side effects related to the disruption of these normal biological functions.

Other names

Attachment factorViral co-receptorAccessory receptorEntry co-receptor

Drugs targeting cellular attachment co-receptors typically act by competitively binding to the viral attachment proteins or the co-receptors themselves, thereby preventing the initial adherence of the pathogen to the host cell surface and reducing the efficiency of viral entry.