R-phycoerythrin (PE) is a stable and highly soluble phycobiliprotein which provides maximal absorbance and fluorescence without susceptibility to internal or external fluorescence quenching, thus providing an exceptional quantum yields and molar extinction coefficients.
Human immunodeficiency virus (HIV) and related viruses require coreceptors, in addition to CD4, to infect target cells. Some G protein-coupled receptors including CCR5, CXCR4, CCR3, CCR2b and CCR8 in the chemokine receptor family, and four new human molecules GPR15, STRL33, GPR1 and V28 were recently identified as HIV coreceptors. Among them, CXCR4 (fusin, LESTR or HUMSTR) is a principal coreceptor for T-cell tropic strains of HIV-1 fusion and entry of human white blood cells. CXCR4 is also required for the infection by dual-tropic strains of HIV-1 and mediates CD-4 independent infection by HIV-2. The a-chemokine SDF-1 is the ligand for CXCR4 and prevents infection by T-tropic HIV-1. CXCR4 associates with the surface CD4-gp120 complex before HIV enters target cells. CXCR4 messenger RNA levels correlated with HIV-1 permissiveness in diverse human cell types. Antibodies to CXCR4 block HIV-1 and HIV-2 fusion and infection of human target cells. The amino-terminal domain and the second extracellular loop of CXCR4 serve as HIV biding sites.
Analyte Specific Reagent
Protein Aliases: C-X-C chemokine receptor type 4; CD184; CD184 antigen; chemokine (C-X-C motif) receptor 4; chemokine receptor; CXC-R4; D2S201E; FB22; Fusin; HM89; HSY3RR; LAP-3; LAP3; LCR1; LESTR; Leukocyte-derived seven transmembrane domain receptor; Lipopolysaccharide-associated protein 3; LPS-associated protein 3; neuropeptide Y receptor Y3; neuropeptide Y3 receptor; NPY3R; NPYR; NPYRL; NPYY3R; SDF-1 receptor; seven transmembrane helix receptor; seven-transmembrane-segment receptor, spleen; Stromal cell-derived factor 1 receptor; WHIM
Gene Aliases: CD184; CXCR4; D2S201E; FB22; HM89; HSY3RR; LAP-3; LAP3; LCR1; LESTR; NPY3R; NPYR; NPYRL; NPYY3R; WHIM; WHIMS
UniProt ID: (Human) P61073
Entrez Gene ID: (Human) 7852
Molecular Function: cell adhesion molecule cytokine receptor defense/immunity protein hydrolase immunoglobulin receptor superfamily immunoglobulin superfamily cell adhesion molecule phosphatase protein phosphatase receptor