DC-SIGN1/CD209

DC-SIGN1, assigned CD209, is a C-type lectin receptor built from a carbohydrate-recognition domain, a neck region with tandem repeats, and a transmembrane anchor. It recognizes high-mannose and fucosylated glycans such as those on ICAM-3 and ICAM-2, mediating both antigen capture by dendritic cells and trans-endothelial migration. DC-SIGN1 is prominent on immature monocyte-derived dendritic cells and on macrophages of placenta and lung. It is well known as an attachment factor for enveloped viruses, with HIV-1, SARS-CoV, and dengue virus among those that use the lectin to enhance infection or dissemination. Recombinant DC-SIGN1/CD209 is employed in glycan-binding studies, viral attachment assays, and adjuvant research.