CD81 Antibody [APR11037G]

CD81 Antibody [APR11037G] | Gentaur UK, US & Europe Distribution

Product Category: Monoclonal Antibodies

Host: Mouse

Species Reactivity: H, Rat

Specificity: This CD81 antibody is generated from a mouse immunized with recombinant protein from the human region of human CD81.

Cellular Localisation: Cell membrane; Multi-pass membrane protein. Basolateral cell membrane; Multi-pass membrane protein. Note=Associates with CLDN1 and the CLDN1-CD81 complex localizes to the basolateral cell membrane

Molecular Weight: 25809

Clone: Monoclonal

Gene Name: CD81 {ECO:0000303|PubMed:8766544, ECO:0000312|HGNC:HGNC:1701}

Gene ID: 975

Function: Structural component of specialized membrane microdomains known as tetraspanin-enriched microdomains (TERMs), which act as platforms for receptor clustering and signaling. Essential for trafficking and compartmentalization of CD19 receptor on the surface of activated B cells (PubMed:20237408, PubMed:27881302, PubMed:16449649) . Upon initial encounter with microbial pathogens, enables the assembly of CD19-CR2/CD21 and B cell receptor (BCR) complexes at signaling TERMs, lowering the threshold dose of antigen required to trigger B cell clonal expansion and antibody production (PubMed:15161911, PubMed:20237408) . In T cells, facilitates the localization of CD247/CD3 zeta at antigen-induced synapses with B cells, providing for costimulation and polarization toward T helper type 2 phenotype (PubMed:22307619, PubMed:23858057, PubMed:8766544) . Present in MHC class II compartments, may also play a role in antigen presentation (PubMed:8409388, PubMed:8766544) . Can act both as positive and negative regulator of homotypic or heterotypic cell-cell fusion processes. Positively regulates sperm-egg fusion and may be involved in acrosome reaction (By similarity) . In myoblasts, associates with CD9 and PTGFRN and inhibits myotube fusion during muscle regeneration (By similarity) . In macrophages, associates with CD9 and beta-1 and beta-2 integrins, and prevents macrophage fusion into multinucleated giant cells specialized in ingesting complement-opsonized large particles (PubMed:12796480) . Also prevents the fusion of mononuclear cell progenitors into osteoclasts in charge of bone resorption (By similarity) . May regulate the compartmentalization of enzymatic activities. In T cells, defines the subcellular localization of dNTPase SAMHD1 and permits its degradation by the proteasome, thereby controlling intracellular dNTP levels (PubMed:28871089) . Also involved in cell adhesion and motility. Positively regulates integrin-mediated adhesion of macrophages, particularly relevant for the inflammatory response in the lung (By similarity) .

Summary: Tissue Location: Expressed on B cells (at protein level) (PubMed:20237408) . Expressed in hepatocytes (at protein level) (PubMed:12483205) . Expressed in monocytes/macrophages (at protein level) (PubMed:12796480) . Expressed on both naive and memory CD4- positive T cells (at protein level) (PubMed:22307619)

Form: Purified monoclonal antibody supplied in PBS with 0.09% (W/V) sodium azide. This antibody is purified through a protein G column, followed by dialysis against PBS.

Storage: Store at +4°C short term. For long-term storage, aliquot and store at -20°C or below. Stable for 12 months at -20°C. Avoid repeated freeze-thaw cycles.

Application: WB

Dilution: WB--1:2000 IHC--1:1000 WB--1:4000

Synonyms: CD81 antigen, 26 kDa cell surface protein TAPA-1, Target of the antiproliferative antibody 1, Tetraspanin-28, Tspan-28, CD81, CD81, TAPA1, TSPAN28