Recombinant Human GALNT12 Protein, CF

R&D Systems | Catalog # 9074-GT

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Key Product Details

  • R&D Systems CHO-derived Recombinant Human GALNT12 Protein (9074-GT)
  • Quality control testing to verify active proteins with lot specific assays by in-house scientists
  • All R&D Systems proteins are covered with a 100% guarantee

Source

CHO

Accession Number

Q8IXK2

Applications

Enzyme Activity
View all Polypeptide GalNAc Transferase 12/GALNT12 Proteins and Enzymes »

Product Specifications

Source

Chinese Hamster Ovary cell line, CHO-derived human Polypeptide GalNac Transferase 12/GALNT12 protein
Arg38-Leu581 with a C-terminal 6-His tag

Purity

>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.

N-terminal Sequence Analysis

Arg38

Predicted Molecular Mass

64 kDa

SDS-PAGE

58-67 kDa, reducing conditions

Activity

Measured by its ability to transfer GalNAc from UDP-GalNAc to peptide EA2 from AnaSpec, Inc.
The specific activity is >90 pmol/min/μg, as measured under the described conditions. See Activity Protocol on www.RnDSystems.com.

Formulation, Preparation, and Storage

9074-GT
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.

Background: Polypeptide GalNAc Transferase 12/GALNT12

O-glycosylation is a ubiquitous post-translational modification present in secreted and membrane-bound proteins. Polypeptide N-acetylgalactosaminyltransferases (GALNTs) catalyze the initial step for O-glycosylation by transferring GalNAc to Thr or Ser residues (GalNAc alpha 1-O-Ser/Thr) in the Golgi compartment. Structurally, the GALNTs consist of an N-terminal catalytic domain tethered by a short linker to a C-terminal ricin-like lectin domain containing three potential carbohydrate-binding sites (1, 2). Twenty distinct GALNT isoforms have been detected in humans. These isoforms display both unique and overlapping substrate specificities (3, 4, 5) with no known universal consensus glycosylation sequence. Glycosylation of mucins results from the successive, often hierarchical, action of several specific GALNTs (6). GALNT12 has activity toward non-glycosylated mucin peptides such as Muc5AC, Muc1a and EA2, and displays enzymatic activity toward mono-GalNAc-glycosylated Muc5AC glycopeptide, but no detectable activity to mono-GalNAc-glycosylated Muc1a, Muc2, Muc7 and EA2. It may play an important role in the initial step of mucin-type oligosaccharide biosynthesis in digestive organs (7). The enzymatic activity of recombinant human GALNT12 was determined using a phosphatase-coupled assay (8).

References

  1. Gerken, T.A. et al (2011) J. Biol. Chem. 286:14493.
  2. Ten Hagen, K.G. et al. (2003) Glycobiology 13:1R.
  3. Hagen, F.K. et al. (1997) J. Biol. Chem. 272:13843.
  4. Gerken, T.A. et al. (2006) J. Biol. Chem. 281:32403.
  5. Wandall, H.H. et al. (1997) J. Biol. Chem. 272:23503.
  6. Pratt, M.R. et al. (2004) Chem. Biol. 11:1009.
  7. Guo, J.M. et al. (2002) FEBS Lett. 524:211.
  8. Wu, Z.L. et al. (2011) Glycobiology 21:727.

Long Name

UDP-GalNAc:polypeptide N-acetylgalactosaminyltransferase 12

Alternate Names

CRCS1, GalNAc-T12, Pp-GaNTase 12

Entrez Gene IDs

79695 (Human); 230145 (Mouse); 313233 (Rat)

Gene Symbol

GALNT12

UniProt

Q8IXK2

Additional Polypeptide GalNAc Transferase 12/GALNT12 Products

Product Documents for Recombinant Human GALNT12 Protein, CF

Certificate of Analysis

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Note: Certificate of Analysis not available for kit components.

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Product Specific Notices for Recombinant Human GALNT12 Protein, CF

For research use only

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Protocols

View specific protocols for Recombinant Human GALNT12 Protein, CF (9074-GT):

Materials
  • Glycosyltransferase Activity Kit (Catalog # EA001)
  • Assay Buffer: 25 mM Tris, 5 mM MnCl2, pH 7.5
  • AssayRecombinant Human Polypeptide GalNac Transferase 12/GALNT12  (rhGALNT12) (Catalog # 9074-GT)
  • UDP-GalNAc (Sigma, Catalog # U5252), 10 mM stock in deionized water
  • EA2 peptide (AnaSpec Inc, Catalog # 63841), 5 mM in 5 mM Tris, pH 7.0
  • 96-well Clear Plate (Catalog # DY990)
  • Plate Reader (Model: SpectraMax Plus by Molecular Devices) or equivalent
  1. Dilute 1 mM Phosphate Standard provided by the Glycosyltransferase Activity Kit by adding 40 µL of the 1 mM Phosphate Standard to 360 µL of Assay Buffer for a 100 µM stock. This is the first point of the standard curve.
  2. Complete the standard curve by performing six one-half serial dilutions of the 100 µM Phosphate stock using Assay Buffer. The standard curve has a range of 0.078 to 5 nmol per well.
  3. Prepare reaction mixture containing 2 mM UDP-GalNAc, 1 mM EA2 peptide, and 8 µg/mL Coupling Phosphatase 1 (supplied in kit) in Assay Buffer.
  4. Dilute rhGALNT12 to 10 µg/mL in Assay Buffer.
  5. Load 50 µL of each dilution of the standard curve into a plate. Include a curve blank containing 50 μL of Assay Buffer.
  6. Load 25 µL of 10 µg/mL rhGALNT12 into empty wells of the same plate as the curve. Include a Control containing 25 μL of Assay Buffer.
  7. Add 25 µL of the reaction mixture to all wells, excluding the standard curve.
  8. Seal plate and incubate at 37 °C for 20 minutes.
  9. Add 30 µL of the Malachite Green Reagent A to all wells. Mix briefly.
  10. Add 100 µL of deionized water to all wells. Mix briefly.
  11. Add 30 µL of the Malachite Green Reagent B to all wells. Mix and incubate sealed plate for 20 minutes at room temperature.
  12. Read plate at 620 nm (absorbance) in endpoint mode.
  13. 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 Control.

Per Reaction:

  • rhGALNT12: 0.25 µg
  • Coupling Phosphatase 1: 0.2 µg
  • UDP- GalNac: 1 mM
  • EA2 peptide: 0.5 mM

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