Recombinant Mouse ENPP-6 Protein, CF

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R&D Systems Recombinant Proteins and Enzymes
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Product Details

Recombinant Mouse ENPP-6 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 cleave O-(4-Nitrophenylphosphoryl) choline. The specific activity is >3,000 pmol/min/μg, as measured under the described conditions.
Human embryonic kidney cell, HEK293-derived mouse ENPP-6 protein
His23-Ser419, with a C-terminal 6-His tag
Accession #
N-terminal Sequence
Predicted Molecular Mass
47 kDa
50-64 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 polar packs. 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, -20 to -70 °C as supplied.
  • 3 months, -20 to -70 °C under sterile conditions after opening.

Assay Procedure

  • Assay Buffer: 50 mM Tris, 0.5 M NaCl, pH 9.0
  • Recombinant Mouse ENPP-6 (rmENPP-6) (Catalog # 8990-EN)
  • Substrate: O-(4-Nitrophenylphosphoryl) choline (Sigma, Catalog # N5879), 500 mM stock in deionized water
  • 96-well Clear Plate (Catalog # DY990)
  • Plate Reader (Model: SpectraMax Plus by Molecular Devices) or equivalent
  1. Dilute rmENPP-6 to 0.2 µg/mL in Assay Buffer.
  2. Dilute Substrate to 2 mM in Assay Buffer.
  3. Load 50 µL of 0.2 µg/mL rmENPP-6 in a clear strip well plate, and start the reaction by adding 50 µL of 2 mM Substrate. Include a Substrate Blank containing 50 µL Assay Buffer and 50 µL 2 mM Substrate.
  4. Read at 405 nm (absorbance) in kinetic mode for 5 minutes.
  5. Calculate specific activity:

     Specific Activity (pmol/min/µg) =

Adjusted Vmax* (OD/min) x Conversion Factor** (pmol/OD)
amount of enzyme (µg)
      *Adjusted for Substrate Blank
      **Derived using calibration standard p-Nitrophenol (Sigma, Catalog # 241326). Per Well:
  • rmENPP-6: 0.01 µg
  • Substrate: 1 mM
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: ENPP-6

Ectonucleotide Pyrophosphatase/Phosphodiesterase 6 (ENPP-6) is a choline-specific glycerophosphodiester phosphodiesterase. It is a member of a family of membrane-linked glycoproteins that, at an alkaline pH, hydrolyze pyrophosphate or phosphodiester bonds in a variety of extracellular compounds including nucleotides, lysophospholipids, and choline phosphate esters (1). Mouse ENPP-6 is a GPI-linked protein that is synthesized as a 440 amino acid (aa) precursor and has a predicted molecular weight of approximately 55 kDa (2). Its extracellular region contains a catalytic domain that is nearly 400 aa in length and shares 90% and 96% aa sequence identity with the human and rat orthologs, respectively (1, 3). A soluble form of ENPP-6 can be proteolytically shed and associate into a
disulfide-linked homodimer (2, 4).

The catalytic domain of ENPP-6 specifically recognizes the phosphocholine part of its substrate (2, 3). ENPP-6 has been shown to display preference for choline-containing phospholipids or phosphodiesters such as lysophosphatidylcholine (LPC), glycerophosphorylcholine (GPC), sphingosylphosphorylcholine (SPC), Platelet-Activating Factor (PAF), and lysoPAF (3). Furthermore, ENPP-6 shows preference for LPC with short (12:0 and 14:0) or polyunsaturated (18:2 and 20:4) fatty acids (3). In vitro, ENNP-6 has been shown to efficiently hydrolyze the classical substrate for phospholipase C, p-nitrophenyl phosphorylcholine, but not the classical nucleotide phosphodiesterase substrate, p-nitrophenyl thymidine 5'-monophosphate (3). ENPP-6 is predominantly expressed in brain, where it is localized to myelin and kidney, with lesser expression being found in the heart (3, 5). ENPP-6 expression in the brain has been shown to be regulated by Thyroid Hormone and iron (6, 7). Additionally, in rat brain, ENPP-6 expression has been shown to be upregulated during oligodendrocyte differentiation (8, 9).

  1. Stefan, C. et al. (2005) Trends Biochem. Sci. 30:542.
  2. Greiner-Tollersrud, O.K. (2014) Neurochem. Res. 39:2025.
  3. Sakagami, H. et al. (2005) J. Biol. Chem. 280:23084.
  4. Greiner-Tollersrud, L. et al. (2013) Neurochem. Res. 38:300.
  5. Jahn, O. et al. (2009) Mol. Neurobiol. 40:55.
  6. Royland, J.E. et al. (2008) J. Neuroendocrinol. 20:1319.
  7. Bastian, T.W. et al. (2012) Endocrinology 153:5668.
  8. Dugas, J.C. et al. (2006) J. Neurosci. 26:10967.
  9. Cahoy, J.D. et al. (2008) J. Neurosci. 28:264.
Long Name
Ectonucleotide Pyrophosphatase/Phosphodiesterase 6
Entrez Gene IDs
133121 (Human); 320981 (Mouse); 306460 (Rat)
Alternate Names
B830047L21Rik; EC 3.1; ectonucleotide pyrophosphatase/phosphodiesterase 6; ectonucleotide pyrophosphatase/phosphodiesterase family member 6; E-NPP 6; ENPP6; ENPP-6; GPC-Cpde; MGC33971; NPP6; NPP-6


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