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A5168 Sigma-Aldrich

Adenosine Deaminase from bovine spleen

Type IX, ammonium sulfate suspension, 150-200 units/mg protein

Synonym: Adenosine aminohydrolase



Related Categories 3.5.x.x Acting on C-N other than peptides, 3.x.x.x Hydrolases, Biochemicals and Reagents, Cell Biology, Enzyme Class Index,
Quality Level   200
type   Type IX
form   ammonium sulfate suspension
specific activity   150-200 units/mg protein
mol wt   32.5-33 kDa
foreign activity   5′-AMP deaminase ≤0.01%
  alkaline phosphatase ≤0.01%
  guanase ≤0.01%
  nucleoside phosphorylase ≤0.1%
storage temp.   2-8°C
Gene Information   cow ... ADA(280712)


General description

Adenosine deaminase/ADA is an enzyme, that is mainly present in lymphocytes and monocytes.

Molecular weight: 32.5-33 kDa

pI: 4.85


Adenosine Deaminase from bovine spleen has been used to metabolize adenosine triphosphate (ATP) and adenosine to an inactive form (inosine). It has also been used to as an additive in KRH (Krebs−Ringer solution buffered with Hepes, containing CaCl2) medium in order to remove exogenous adenosine for cyclic adenosine monophosphate (cAMP) assay.

Adenosine deaminase is useful in various molecular biology assays, such as glycerol release assays . Adenosine deaminase is a potential target for treatments of combined immunodeficiency disease.

Biochem/physiol Actions

Adenosine deaminase is a purine catabolic enzyme which catalyzes the deamination of adenosine and 2′-deoxyadenosine with approximately equal specificity. It is ubiquitous in mammalian tissue, and deficiency in adenosine deaminase has been associated with severe combined immunodeficiency disease.

Adenosine deaminase/ADA can be used as an important marker to identify tuberculous pleural effusion. The activity of ADA is usually high in liver disease, tuberculosis, typhoid, infective mononucleosis and several malignancies.

Unit Definition

One unit will deaminate 1.0 μmole of adenosine to inosine per min at pH 7.5 at 25 °C.

Physical form

Suspension in 3.2 M (NH4)2SO4, 0.01 M potassium phosphate, pH 6.0

Analysis Note

Protein determined by biuret.

Safety & Documentation

Safety Information

NONH for all modes of transport
WGK Germany 
Flash Point(F) 
Not applicable
Flash Point(C) 
Not applicable


Certificate of Analysis (COA)

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Certificate of Origin (COO)

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Protocols & Articles


Ammonium Sulfate Suspensions - Technical Note

Note that for an ammonium sulfate suspension, most of the enzyme will be in solid form. It is likely that only negligible amounts of enzyme will be in the ammonium sulfate solution.
Keywords: Enzyme activity

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