Scavenger receptor that displays several functions associated with host defense. Promotes binding and phagocytosis of Gram-positive, Gram-negative bacteria and yeast. Mediates the recognition, internalization and degradation of oxidatively modified low density lipoprotein (oxLDL) by vascular endothelial cells. Binds to several carbohydrates including Gal-type ligands, D-galactose, L- and D-fucose, GalNAc, T and Tn antigens in a calcium-dependent manner and internalizes specifically GalNAc in nurse-like cells. Binds also to sialyl Lewis X or a trisaccharide and asialo-orosomucoid (ASOR) (By similarity). The extracellular domain forms a stable trimer. The extracellular domain interacts with fibrillar amyloid-beta peptide (By similarity). Forms clusters on the cell surface. Highly expressed in lung, spleen, small and large intestine, stomach and brain. Expressed in neonatal microglia.