Recombinant Human Adenosine Kinase/ADK Protein, CF

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Recombinant Human Adenosine Kinase/ADK Protein, CF Summary

Product Specifications

>95%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.
Endotoxin Level
<1.0 EU per 1 μg of the protein by the LAL method.
Measured by its ability to phosphorylate Adenosine. The specific activity is >7 pmol/min/μg, as measured under the described conditions.
E. coli-derived human ADK protein
Ala2-His362 with a C-terminal 6-His tag
Accession #
N-terminal Sequence
Predicted Molecular Mass
41 kDa
43-45 kDa, reducing conditions

Product Datasheets

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Carrier Free

What does CF mean?

CF stands for Carrier Free (CF). We typically add Bovine Serum Albumin (BSA) as a carrier protein to our recombinant proteins. Adding a carrier protein enhances protein stability, increases shelf-life, and allows the recombinant protein to be stored at a more dilute concentration. The carrier free version does not contain BSA.

What formulation is right for me?

In general, we advise purchasing the recombinant protein with BSA for use in cell or tissue culture, or as an ELISA standard. In contrast, the carrier free protein is recommended for applications, in which the presence of BSA could interfere.


Formulation Supplied as a 0.2 μm filtered solution in Tris and NaCl.
Shipping The product is shipped with dry ice or equivalent. Upon receipt, store it immediately at the temperature recommended below.
Stability & Storage: Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  • 6 months from date of receipt, -70 °C as supplied.
  • 3 months, -70 °C under sterile conditions after opening.

Assay Procedure

  • Assay Buffer: (10X) 250 mM HEPES, 1.5 M NaCl, 100 mM MgCl2, 100 mM CaCl2 pH 7.0 (supplied in kit)
  • Recombinant Human Adenosine Kinase/ADK (Catalog # 8024-AK)
  • Adenosine (Sigma, Catalog # A9251), 10 mM stock in deionized water
  • Adenosine triphosphate (ATP) (Sigma, Catalog # A7699), 10 mM stock in deionized water
  • Universal Kinase Activity Kit (Catalog # EA004)
  • 96-well Clear Plate (Costar, Catalog # 92592)
  • Plate Reader (Model: SpectraMax Plus by Molecular Devices) or equivalent
  1. Prepare 1X Assay Buffer by diluting 10X Assay Buffer in deionized water.
  2. Dilute 1 mM Phosphate Standard provided by the Universal Kinase Activity Kit by adding 40 µL of the 1 mM Phosphate Standard to 360 µL of 1X  Assay Buffer for a 100 µM stock.
  3. Prepare standard curve by performing seven one-half serial dilutions of the 100 µM Phosphate stock in 1X Assay Buffer. The standard curve has a range of 0.039 to 2.5 nmol per well.
  4. Load 50 µL of each dilution of the standard curve into a plate in triplicate. Include a curve blank containing 50 μL of 1X Assay Buffer.
  5. Prepare Substrate Mixture composed of 0.364 mM ATP and 3.64 mM Adenosine in 1X Assay Buffer.
  6. Dilute rhADK to 50 ng/µL in 1X Assay Buffer.
  7. Load 20 µL of the 50 ng/µL rhADK into the plate in triplicate. Include a control containing 20 µL of 1X Assay Buffer.
  8. Add 55 µL of Substrate Mixture to the wells, excluding the standard curve and curve blank.
  9. Incubate sealed at 37 °C for 1 hour.
  10. Dilute Coupling Phosphatase 4 (supplied in kit) to 2.67 µg/mL in 1X Assay Buffer.
  11. Add 100 µL of 1X Assay Buffer to each well containing the standard curve and curve blank.
  12. Add 75 µL of 2.67 µg/mL Coupling Phosphatase 4 to wells containing enzyme and blanks, excluding the standard curve and curve blank.
  13. Incubate sealed plate at room temperature for 5 minutes.
  14. Add 30 µL of the Malachite Green Reagent A to all wells. Mix briefly.
  15. Add 30 µL of the Malachite Green Reagent B to all wells. Mix and incubate for 20 minutes at room temperature.
  16. Read plate at 620 nm (absorbance) in endpoint mode.
  17. Calculate specific activity:

     Specific Activity (pmol/min/µg) =

Phosphate released* (nmol) x (1000 pmol/nmol)
Incubation time (min) x amount of enzyme (µg)

     *Derived from the phosphate standard curve using linear fitting and adjusted for Substrate Blank.
     **Use the sum of the incubation times prior to the addition of Malachite Green reagents due to the constant conditions throughout the assay.

Note:  No coupling rate is applicable for this assay.

Per Reaction:
  • rhADK: 1.0 µg
  • Coupling Phosphatase 4: 0.2 µg
  • ATP: 20 nmol
  • Adenosine: 200 nmol
Reconstitution Calculator

Reconstitution Calculator

The reconstitution calculator allows you to quickly calculate the volume of a reagent to reconstitute your vial. Simply enter the mass of reagent and the target concentration and the calculator will determine the rest.


Background: ADK

Adenosine kinase (ADK) converts adenosine into 5'-adenosine-monophosphate. ADK is therefore key in regulating the concentration of adenosine, an essential homeostatic and metabolic regulator in all living systems (1). Adenosine not only activates specific signaling pathways by binding to adenosine receptors but also is a primordial metabolite and regulator of numerous biochemical reactions that are related to metabolism and genetics. ADK dysfunction is involved in several pathologies, including diabetes, epilepsy, and cancer. For example, inhibiting ADK activity promotes the replication of primary insulin-producing beta cells in diabetic mouse, rat, and pig (2); mutation of ADK causes hypermethioninemia, a condition with an excess of methionine in the blood (3); ADK is also identified as a neuropathological marker of the epileptic brain (4). Given its significant roles in various diseases, ADK is a rational therapeutic target (1). ADK is widely expressed in all tissues, with elevated levels in placenta, liver, muscle and kidney (5). The enzymatic activity of recombinant human ADK is measured using a phosphatase-coupled method (6).

  1. Boison, D. (2013) Pharmacol. Rev. 65:906.
  2. Annes, J.P. et al. (2012) Proc. Natl. Acad. Sci. U.S.A. 109:3915.
  3. Bjursell, M.K. et al. (2011) Am. J. Hum. Genet. 89:507.
  4. Aronica, E. et al. (2013) Neurochem. Int. in press.
  5. Spychala, J. et al. (1996) Proc. Natl. Acad. Sci. U.S.A. 93:1232.
  6. Wu, Z.L. (2011) PLoS One 6:e23172.
Long Name
Adenosine Kinase
Entrez Gene IDs
132 (Human); 11534 (Mouse); 25368 (Rat)
Alternate Names
adenosine kinase; ADK; AK; AKAdenosine 5'-phosphotransferase; EC 2.7.1; EC

Citation for Recombinant Human Adenosine Kinase/ADK Protein, CF

R&D Systems personnel manually curate a database that contains references using R&D Systems products. The data collected includes not only links to publications in PubMed, but also provides information about sample types, species, and experimental conditions.

1 Citation: Showing 1 - 1

  1. Slowly on, Slowly off: Bisubstrate-Analogue Conjugates of 5-Iodotubercidin and Histone H3 Peptide Targeting Protein Kinase Haspin
    Authors: K Kestav, K Viht, A Konovalov, E Enkvist, A Uri, D Lavogina
    Chembiochem, 2017;0(0):.
    Applications: Bioassay


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