Functions as a positive regulator of osteoclastogenesis (By similarity). Cell surface receptor that signals via TYROBP (PubMed:10449773). Regulates inflammatory responses (By similarity). (Microbial infection) Critical macrophage receptor for dengue virus serotypes 1-4 (PubMed:18496526, PubMed:21566123). The binding of dengue virus to CLEC5A triggers signaling through the phosphorylation of TYROBP (PubMed:18496526). This interaction does not result in viral entry, but stimulates pro-inflammatory cytokine release (PubMed:18496526). Monomer (PubMed:21566123). Homodimer (PubMed:21566123). The majority of CLEC5A is expressed as a monomeric form on macrophages (PubMed:21566123). Interacts with TYROBP/DAP12 (PubMed:10449773). The interaction with TYROBP is required for CLEC5A cell surface expression (PubMed:10449773). Interacts with HCST/DAP10 (By similarity). Forms a CLEC5A/TYROBP/HCST trimolecular complex depending almost solely on TYROBP (By similarity). (Microbial infection) Interacts with dengue virus envelope protein E (PubMed:18496526, PubMed:21566123). Highly expressed in bone marrow with lower levels in synovium, lung and bronchus (PubMed:20212065). Expressed in peripheral blood monocytes and in the monocyte/macrophage cell lines U-937 and Mono-Mac-6, but not in cell lines of other origins (PubMed:10449773). Expression is down-regulated when monocytes differentiate into dendritic cells (PubMed:10449773). N-glycosylated. Contains sialic acid residues. Acts as a key regulator of synovial injury and bone erosion during autoimmune joint inflammation when its activation leads to enhanced recruitment of inflammatory macrophages and neutrophils to the joints. MDL-1