Catalyzes the hydrolytic deamination of adenosine and 2-deoxyadenosine. Plays an important role in purine metabolism and in adenosine homeostasis. Modulates signaling by extracellular adenosine, and so contributes indirectly to cellular signaling events. Acts as a positive regulator of T-cell coactivation, by binding DPP4. Its interaction with DPP4 regulates lymphocyte-epithelial cell adhesion.
Found in all tissues, occurs in large amounts in T-lymphocytes and, at the time of weaning, in gastrointestinal tissues.
Involvement in disease
Defects in ADA are the cause of severe combined immunodeficiency autosomal recessive T-cell-negative/B-cell-negative/NK-cell-negative due to adenosine deaminase deficiency (ADASCID) [MIM:102700]. SCID refers to a genetically and clinically heterogeneous group of rare congenital disorders characterized by impairment of both humoral and cell-mediated immunity, leukopenia, and low or absent antibody levels. Patients with SCID present in infancy with recurrent, persistent infections by opportunistic organisms. The common characteristic of all types of SCID is absence of T-cell-mediated cellular immunity due to a defect in T-cell development. ADA-SCID is an autosomal recessive form accounting for about 50% of non-X-linked SCIDs. ADA deficiency has been diagnosed in chronically ill teenagers and adults (late or adult onset). Population and newborn screening programs have also identified several healthy individuals with normal immunity who have partial ADA deficiency.
Belongs to the adenosine and AMP deaminases family.
Cell membrane. Cell junction. Cytoplasmic vesicle lumen. Cytoplasm. Colocalized with DPP4 at the cell junction in lymphocyte-epithelial cell adhesion.
All lanes : Anti-ADA antibody (ab226395) at 0.1 µg/ml
Lane 1 : HeLa (human epithelial cell line from cervix adenocarcinoma) whole cell lysate Lane 2 : HEK-293T (human epithelial cell line from embryonic kidney transformed with large T antigen) whole cell lysate Lane 3 : Jurkat (human T cell leukemia cell line from peripheral blood) whole cell lysate
ADA was immunoprecipitated from Jurkat (human T cell leukemia cell line from peripheral blood) whole cell lysate (prepared using NETN buffer; 1.0 mg for IP, 20% of IP loaded) with ab226395 at 6 µg/mg lysate. Western blot was performed from the immunoprecipitate using ab226395 at 0.4 µg/ml.
Lane 1: ab226395 IP in Jurkat whole cell lysate.
Lane 2: Control IgG IP in Jurkat whole cell lysate.
Detection: Chemiluminescence with exposure time of 3 seconds.
has not yet been referenced specifically in any publications.
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