|Detection of XCR1 in CD141+ HLA-DR+ Human Blood Monocytes by Flow Cytometry. Human peripheral blood monocytes were stained with (A) Mouse Anti-Human HLA-DR Fluorescein-Conjugated MonoclonalAntibody (Catalog # FAB4869F), Mouse Anti-Human Thrombomodulin/BDCA-3 (CD141) APC-Conjugated Monoclonal Antibody (Catalog #FAB3947A) and (B) Rabbit Anti-Human XCR1 PE‑conjugated Monoclonal Antibody (Catalog # FAB8571P, filled histogram) or isotype control antibody (Catalog # IC105P, open histogram). View our protocol for Staining Membrane-associated Proteins.|
XCR1, also known as GPR5 and Lymphotactin/SCM-1 (Single Cysteine Motif 1) Receptor, is a 38 kDa member of the G-protein coupled receptor 1 family. It binds XCL1/Lymphotactin/SCM-1 alpha and XCL2/SCM-1 beta. In addition, Human Herpes Virus 8 (HHV8) encodes two viral chemokines vCCL2/vMIP-II and vCCL3/vMIP-III that function as an antagonist and a highly selective agonist, respectively, for XCR1. XCR1 is expressed on neutrophils, CD8+ T cells, NK cells, CD4+ T cells and B cells. Human XCR1 is a 333 amino acid (aa), 7-transmembrane molecule. It contains a 32 aa N-terminus that lacks glycosylation sites and a 42 aa C-terminal cytoplasmic tail. Over the extracellular regions used for immunization, human XCR1 shares 62%, 54% and 64% aa identity with canine, mouse and porcine XCR1, respectively.