Recombinant Human Choline Kinase beta Protein, CF

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Product Details

Summary
Reactivity HuSpecies Glossary
Applications Enzyme Activity
Format
Carrier-Free

Order Details

Recombinant Human Choline Kinase beta Protein, CF Summary

Details of Functionality
Measured by its ability to phosphorylate choline chloride. The specific activity is >250 pmol/min/μg, as measured under the described conditions.
Source
E. coli-derived human Choline Kinase beta protein
Arg35-Ser395, with an N-terminal Met and a C-terminal 6-His tag
Accession #
N-terminal Sequence
Met
Protein/Peptide Type
Recombinant Enzymes
Gene
CHKB
Purity
>90%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.
Endotoxin Note
<1.0 EU per 1 μg of the protein by the LAL method.

Applications/Dilutions

Theoretical MW
43 kDa.
Disclaimer note: The observed molecular weight of the protein may vary from the listed predicted molecular weight due to post translational modifications, post translation cleavages, relative charges, and other experimental factors.
SDS-PAGE
40-43 kDa, reducing conditions

Packaging, Storage & Formulations

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.
Buffer
Supplied as a 0.2 μm filtered solution in Tris, NaCl, TCEP and Glycerol.
Purity
>90%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.
Assay Procedure
  • Universal Kinase Activity Kit (Catalog # EA004)
  • 10X Assay Buffer (supplied in kit): 250 mM HEPES, 1500 mM NaCl, 100 mM MgCl2, 100 mM CaCl2, pH 7.0
  • Recombinant Human Choline Kinase beta  (rhCHK beta ) (Catalog # 8184-CK)
  • Choline Chloride (Sigma, Catalog # 26980), 500 mM stock in deionized water
  • 96-well Clear Plate (Catalog # DY990)
  • 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. This is the first point of the standard curve.
  3. Prepare standard curve by performing six one-half serial dilutions of the 100 µM Phosphate stock in 1X Assay Buffer.  The standard curve has a range of 0.078 to 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 0.4 mM ATP and 20 mM Choline Chloride in 1X Assay Buffer.
    Dilute rhCHK beta to 20 ng/µL in 1X Assay Buffer.
  6. Load 15 µL of the 20 ng/µL rhCHK beta into the plate in triplicate. Include a Control containing 15 µL of 1X Assay Buffer.
  7. Dilute Coupling Phosphatase 4 (supplied in kit) to 10 µg/mL in 1X Assay Buffer.
  8. Add 10 µL of 10 µg/mL Coupling Phosphatase 4 to wells containing enzyme and Control, excluding the standard curve.
  9. Add 25 µL of Substrate Mixture to the wells, excluding the standard curve.
  10. Incubate sealed plate at room temperature for 10 minutes.
  11. Add 30 µL of the Malachite Green Reagent A to all wells.  Mix briefly.
  12. Add 100 µL of deionized water to all wells. Mix briefly.
  13. Add 30 µL of the Malachite Green Reagent B to all wells.  Mix and incubate for 20 minutes at room temperature.
  14. Read plate at 620 nm (absorbance) in endpoint mode.
  15. Calculate specific activity:

     Specific Activity (pmol/min/µg) =

Adjusted phosphate released* (nmol) x (1000 pmol/nmol)
Incubation time (min) x amount of enzyme (µg) x coupling rate**

     *Derived from the phosphate standard curve using linear fitting and adjusted for Control.
     **The coupling rate is 0.475 under these conditions.

Per Reaction:
  • rhCHK beta : 0.3 µg
  • Coupling Phosphatase 4: 0.1 µg
  • ATP: 0.2 mM
  • Choline Chloride: 10 mM

Notes

This product is produced by and ships from R&D Systems, Inc., a Bio-Techne brand.

Alternate Names for Recombinant Human Choline Kinase beta Protein, CF

  • CHETK
  • CHETKcholine/ethanolamine kinase beta
  • CHKL
  • CHKLcholine kinase-like
  • ChoKB
  • Choline Kinase beta
  • choline kinase betaEK
  • Choline kinase-like protein
  • CK
  • CKB
  • CKEKB
  • CKEKBEKBcholine/ethanolamine kinase
  • EC 2.7.1.32
  • EC 2.7.1.82
  • EK
  • EKB
  • Ethanolamine Kinase beta
  • Ethanolamine kinase
  • MDCMC

Background

Choline kinase catalyzes the first reaction in the choline pathway for the biosynthesis of phosphatidylcholine and phosphatidylethanolamine, the major phospholipids in eukaryotic membranes. Phosphatidylcholine is important for a variety of function in eukaryotes such as facilitating the transport of cholesterol through the organism, acting as a precursor for second messengers and as a cofactor for several membrane-related enzymes (1, 2). Choline kinase also plays a vital role in the production of sphingomyelin, another important membrane phospholipid (3). While choline kinase alpha (CHKA) is more active on choline, Choline Kinase beta (CHKB) is more active on ethanolamine (4). These two enzymes can also form active heterodimer and oligomer (5, 6). CHKA is associated with breast, lung and prostate carcinomas (7, 8) and is a promising target for cancer diagnosis and treatment (9). Mice lacks CHKA die early in embryogenesis. In contrast, mice that lack CHKB survive to adulthood, but develop hindlimb muscular dystrophy and forelimb bone deformity (10, 11), suggesting that CHKB is a rate-limiting enzyme in skeletal muscles. The enzymatic activity of recombinant human CHKB is measured using a phosphatase-coupled method (12).
  1. Ramírez De Molina, A. et al. (2002) Biochem. Biophys. Res. Commun. 296:580.
  2. Kent, C (1990) Prog Lipid Res. 29:87.
  3. Janardhan, S. et al. (2006). Curr. Med. Chem. 13:1169.
  4. Gallego-Orgega, D. et al. (2009) PLoS ONE 4:E7819.
  5. Aoyama, C. et al. (2004). Prog. Lipid Res. 43:266.
  6. Uchida, T and Yamashita, S (1992). J. Biol. Chem. 267:10156.
  7. Eliyahu, G. et al. (2007) Int. J. Cancer 120:1721.
  8. Ramírez De Molina, A. et al. (2004). Cancer Research 64:6732.
  9. Gallego-Orgega, D. et al. (2011) Adv. Enzyme Regul. 51:183.
  10. Wu, G. and Vance, D.E. (2010) Biochem. Cell Biol. 88:559.
  11. Sher, R.B. et al. (2006) J. Biol. Chem. 281:4938.
  12. Wu, Z.L. (2011) PLoS One 6:e23172.

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Bioinformatics

Gene Symbol CHKB
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