High affinity receptor for N-formyl-methionyl peptides (fMLP), which are powerful neutrophil chemotactic factors (PubMed:2161213, PubMed:2176894, PubMed:10514456, PubMed:15153520). Binding of fMLP to the receptor stimulates intracellular calcium mobilization and superoxide anion release (PubMed:2161213, PubMed:1712023, PubMed:15153520, PubMed:15210802). This response is mediated via a G-protein that activates a phosphatidylinositol-calcium second messenger system (PubMed:1712023, PubMed:10514456). Receptor for TAFA4, mediates its effects on chemoattracting macrophages, promoting phagocytosis and increasing ROS release (PubMed:25109685). Receptor for cathepsin CTSG, leading to increased phagocyte chemotaxis (PubMed:15210802). Interacts with S.aureus chemotaxis inhibitory protein (CHIPS); the interaction blocks the receptor and may thus inhibit the immune response. Internalizes in presence of its ligands, fMLP, TAFA4 and CTSG. Neutrophils. Phosphorylated; which is necessary for desensitization. Belongs to the G-protein coupled receptor 1 family.