Recombinant Human CD39L4/ENTPD5 Protein, CF

• Reactivity: Hu
• Applications: Enzyme Activity
• Format: Carrier-Free

Recombinant Human CD39L4/ENTPD5 Protein, CF Summary

• Details of Functionality: Measured by its ability to hydrolyze the 5’-phosphate groups from the substrate guanosine-5’-diphosphate (GDP). The orthophosphate product is measured by a Malachite Green Phosphate Detection Kit (Catalog # DY996). The specific activity is >7,000 pmol/min/µg, as measured under the described conditions.
• Source: Chinese Hamster Ovary cell line, CHO-derived human CD39L4/ENTPD5 protein
  Val21-His428 (major) & Ser46-His428 (minor), both with a C-terminal 6-His tag
  Accession # O75356
• Accession #: O75356
• N-terminal Sequence: Val21 & Ser46
• Protein/Peptide Type: Recombinant Enzymes
• Gene: ENTPD5
• Purity: >90%, by SDS-PAGE under reducing conditions and visualized by silver stain
• Endotoxin Note: <1.0 EU per 1 μg of the protein by the LAL method.

Applications/Dilutions

• Theoretical MW: 46 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: 50-60 kDa, reducing conditions

Packaging, Storage & Formulations

• 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.
• Buffer: Supplied as a 0.2 μm filtered solution in Tris, CaCl₂, NaCl and Glycerol.
• Purity: >90%, by SDS-PAGE under reducing conditions and visualized by silver stain
• Assay Procedure:
  • Assay Buffer: 25 mM Tris, 5 mM CaCl₂, pH 7.5
  • Recombinant Human CD39L4/ENTPD5 (rhCD39L4) (Catalog # 5297-EN)
  • Substrate: GDP (Sigma, Catalog # G-7127), 100 mM stock in deionized water
  • Malachite Green Phosphate Detection Kit (Catalog # DY996)
  • 96-well Clear Plate (Costar, Catalog # 92592)
  • Plate Reader (Model: SpectraMax Plus by Molecular Devices) or equivalent
  1. Dilute rhCD39L4 to 0.04 µg/mL in Assay Buffer.
  2. Prepare a standard curve from 1 M Phosphate Standard by adding 10 µL of the 1 M Phosphate Standard to 990 µL of Assay Buffer for a 10 mM stock. Continue by adding 10 µL of the 10 mM Phosphate stock to 990 µL of Assay Buffer for a 100 µM stock (this is the first dilution to use as a standard).
  3. Perform six additional one-half serial dilutions of the 100 µM Phosphate stock in Assay Buffer. The standard curve has a range of 0.039 to 2.5 nmol per well.
  4. Load 25 µL of 0.04 μg/mL rhCD39L4 and the standard curve into a plate. Include a Substrate Blank containing Assay Buffer.
  5. Dilute the Substrate to 100 µM in Assay Buffer.
  6. Add 25 µL of the 100 µM Substrate to all wells and mix well.
  7. Cover the plate with parafilm or a plate sealer and incubate at 37 °C for 20 minutes.
  8. Add 10 µL of the Malachite Green Reagent A to all wells. Mix and incubate for 10 minutes at room temperature.
  9. Add 10 µL of the Malachite Green Reagent B to all wells. Mix and incubate for 20 minutes at room temperature.
  10. Read plate at 620 nm (absorbance) in endpoint mode.
  11. 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 or 4-parameter fitting and adjusted for Substrate Blank.

  Per Well:
  • rhCD39L4: 0.001 µg
  • Substrate: 35.7 µM

Notes

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

Alternate Names for Recombinant Human CD39L4/ENTPD5 Protein, CF

• CD39 antigen-like 4
• CD39L4
• CD39L4NTPDase 5
• CD39-like 4
• EC 3.6.1
• EC 3.6.1.42
• EC 3.6.1.6
• ectonucleoside triphosphate diphosphohydrolase 5
• ENTPD5
• ER-UDPase
• GDPase ENTPD5
• Guanosine-diphosphatase ENTPD5
• MGC163357
• MGC163359
• NTPDase 5
• NTPDase-5
• Nucleoside diphosphatase
• Pcph proto-oncogene protein
• PCPH
• proto-oncogene CPH
• UDPase ENTPD5
• Uridine-diphosphatase ENTPD5

Background

Ectonucleoside triphosphate diphosphohydrolase-5 (NTPDase-5) is a protein that can be either secreted or reside in the lumen of the endoplasmic reticulum. The enzyme displays a specificity for nucleoside-5'-diphosphates, preferentially hydrolyzing GDP, IDP, and UDP to produce nucleoside monophosphates and orthophosphate (1). The enzyme is most highly expressed in liver, kidney, prostate, testis, and colon. NTPDase-5 (ENTPD5) and proto-oncogene CPH (PCPH) are encoded by the same gene (2). Alterations in ENTPD5/PCPH expression and mutations of ENTPD5 are associated with the progression of testicular (3), laryngeal (4), and other cancers.

1. Mulero, J.J. et al. (2000) Biochemistry. 39:12924.
2. Paez, J.G.. et al. (2001) Int. J. Oncol. 19:1249.
3. Regadera, J. et al. (2006) Int. J. Oncol. 28:595.
4. Blanquez, M.J. et al. (2002) Mol. Carcinogen. 35:186.
   
   

Bioinformatics

• Gene Symbol: ENTPD5
• Uniprot:
  • O75356(Human)