Low affinity receptor for N-formyl-methionyl peptides, which are powerful neutrophil chemotactic factors (PubMed:1374236). Binding of FMLP to the receptor causes activation of neutrophils (PubMed:1374236). This response is mediated via a G-protein that activates a phosphatidylinositol-calcium second messenger system (PubMed:1374236). The activation of LXA4R could result in an anti-inflammatory outcome counteracting the actions of pro-inflammatory signals such as LTB4 (leukotriene B4) (PubMed:9547339). Receptor for the chemokine-like protein FAM19A5, mediating FAM19A5-stimulated macrophage chemotaxis and the inhibitory effect on TNFSF11/RANKL-induced osteoclast differentiation (By similarity). Acts as a receptor for humanin (PubMed:15465011). Interacts with Amyloid-beta protein 42, product of APP; the interaction takes place at the cell surface and the complex is then rapidly internalized. (Microbial infection) Interacts with Staphylococcus aureus protein SSL13; this interaction leads to the activation of neutrophils. Associates with Amyloid-beta protein 42, product of APP, at the cell surface and the complex is then rapidly internalized (PubMed:11689470). Also internalized in the presence of humanin (PubMed:15465011). Detected in lung, bone marrow, neutrophils, spleen and testis. Belongs to the G-protein coupled receptor 1 family.