CD63 (Extracellular region) (clone M040), anti-human

Background:
Tetraspanins comprise a large superfamily of cell surface-associated membrane proteins with four transmembrane domains. On cell membranes, tetraspanins form networks of various proteins called tetraspanin-enriched microdomains (TEMs). CD63 was the first characterized tetraspanin and it is found in TEMs, as well as late endosomes and lysosomes. In late endosomes, CD63 is enriched on the intraluminal vesicles, and can be secreted as exosomes through fusion of endosomes with the plasma membrane. The complex localization pattern of CD63 suggests that its intracellular trafficking and distribution must be tightly regulated. CD63 contains N-link glycosylation sites that produce diverse CD63 molecules that range from 30 to 60 kDa depending on cell type. CD63 is an important exosomal marker in cancer cells, and may be involved in cancer progression and metastasis.

Background References
Azorsa, D.O. et al. (1991) Blood. 78(2):280.
Metzelaar, M.J. et al. (1991) J Biol Chem. 266(5):3239.
Pols, MS & Klumperman, J (2009) Exp Cell Res. 315(9):1584.

Immunogen: Clone (M040) was generated from a proprietary antigen related to the native human CD63 expressed in MeWo melanoma cell line.

Specificity: Clone M040 mouse monoclonal antibody has high reactivity to CD63 at the plasma membrane in immunocytochemical assays, and weakly detects a 30-60 kDa* protein on SDS-PAGE "Native" immunoblots of human A431, MeWo, and A549 cells. The antibody does not detect denatured CD63 in western blot assays.

Application dilution:
ICC: 1:500
WB: 1:100
End user should determine optimal dilution for their particular applications and experiments.Western blot membranes were incubated with diluted antibody in 5% non-fat milk, PBS, 0.04% Tween20 for 1 hour at room temperature.

Buffer/Storage:
Mouse monoclonal antibody purified with protein G chromatography is supplied in 100µl phosphate-buffered saline, 50% glycerol, 1 mg/ml BSA, and 0.05% sodium azide. Store at –20°C. Stable for 1 year.