Recombinant Human HS3ST1 Protein, CF

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Recombinant Human HS3ST1 Protein, CF Summary

Product Specifications

>90%, by SDS-PAGE under reducing conditions and visualized by silver stain
Endotoxin Level
<1.0 EU per 1 μg of the protein by the LAL method.
Measured by its ability to transfer sulfate from PAPS to heparan sulfate. The specific activity is >30 pmol/min/μg, as measured under the described conditions.
Chinese Hamster Ovary cell line, CHO-derived human Heparan Sulfate 3-O-Sulfotransferase 1/HS3ST1 protein
Arg21-His307, with an N-terminal 6-His tag
Accession #
N-terminal Sequence
Predicted Molecular Mass
35 kDa
38-50 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-HCl 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

  • Universal Sulfotransferase Activity Kit (Catalog # EA003)
  • 10X Assay Buffer (supplied in kit): 500 mM Tris, 150 mM MgCl2, pH 7.5
  • Recombinant Human Heparan Sulfate3-O-Sulfotransferase 1/HS3ST1 (rhHS3ST1) (Catalog # 5968-ST)
  • Donor Substrate: PAP32S (3'-Phosphoadenosine-5'-Phosphosulfate) (Catalog # ES019)
  • Acceptor Substrate: Heparan Sulfate (Celsus Labs, Catalog # HO-3105), 50 mg/mL 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 combining 10X stock and diluting 10 fold with deionized water.
  2. Dilute 1 mM Phosphate Standard 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. Continue 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. Include a curve blank containing 50 μL of 1X Assay Buffer.
  5. Prepare a reaction mixture containing 0.4 mM PAP32S and 4 mg/mL Heparin Sulfate in 1X Assay Buffer.
  6. Dilute Coupling Phosphatase 3 (supplied in kit) to 50 µg/mL in 1X Assay Buffer.
  7. Dilute rhHS3ST1 to 100 µg/mL in 1X Assay Buffer.
  8. Load 15 µL of the 100 µg/mL rhHS3ST1 into empty wells of the same plate as the curve. Include a control containing 15 µL of Assay Buffer.
  9. Add 10 µL of 50 µg/mL Coupling Phosphatase 3 to wells containing enzyme and control, excluding the standard curve.
  10. Add 25 µL of reaction mixture to the wells, excluding the standard curve.
  11. Seal plate and incubate at 37 ºC for 20 minutes.
  12. Add 30 µL of the Malachite Green Reagent A to all wells. Mix briefly.
  13. Add 100 µL of deionized water to all wells. Mix briefly.
  14. Add 30 µL of the Malachite Green Reagent B to all wells. Mix and incubate for 20 minutes at room temperature.
  15. Read plate at 620 nm (absorbance) in endpoint mode.
  16. 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:
  • rhHS3ST1: 1.5 µg
  • Coupling Phosphatase 3: 0.5 µg
  • Heparan Sulfate: 100 µg
  • PAP32S: 0.2 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: Heparan Sulfate 3-O-Sulfotransferase 1/HS3ST1

Heparan sulfate is a highly sulfated polysaccharide that can be found on cell surface and within extracellular matrix. It is typically covalently attached to the protein core of proteoglycans, such as syndecans and glypicans. Heparin, on the other hand, can be considered as a highly sulfated version of heparan sulfate that is detached from the protein core and is predominantly found in mast cells. Both heparin and heparan sulfate contain disaccharide repeats of uronic acid and N‑acetylglucosamine and are modified by the same sulfotransferases (1, 2). The uronic acid residues can be sulfated at 2‑O position by heparan sulfate 2‑O sulfotransferase (HS2ST). The N‑acetylglucosamine residues can be sulfated at N, 3-O, and 6-O positions by N-deacetylase/N-sulfotransferases (NDSTs), heparan sulfate 3‑O sulfotransferases (HS3STs) and heparan sulfate 6-O sulfotransferases (HS6STs) respectively. There are seven HS3STs in the human genome (3, 4). HS3ST1 is a rate-limiting enzyme for generating an antithrombin-binding pentasaccharide epitope on heparan sulfate and heparin (5, 6). Unlike other sulfotransferases that have signal-anchor domains and are type II membrane integral proteins in Golgi apparatus, HS3ST1 lacks a transmembrane domain and is likely to be an intraluminal enzyme (7, 8). The enzyme activity of the recombinant HS3ST1 is measured using a phosphatase-coupled assay (9).

  1. Bernfield, M. et al. (1999) Annu. Rev. Biochem. 68:729.
  2. Esko, J.D. and Selleck, S.B. (2002) Annu. Rev. Biochem. 71:435.
  3. Shworak, N.W. et al. (1999) J. Biol. Chem. 274:5170.
  4. Xu, D. et al. (2005) Biochem. J. 386:451.
  5. Rosenberg, R.D. et al. (1997) J. Clin. Invest. 100:S67.
  6. Esko, J.D and Lindahl, U. (2001) J. Clin. Invest. 108:169.
  7. Shworak, N.W. et al. (1997) J. Biol. Chem. 272:28008.
  8. Liu, J. et al. (1999) J. Biol. Chem. 274:5158.
  9. Prather, B. et al. (2012) Anal.Biochem.423:86
Entrez Gene IDs
9957 (Human); 15476 (Mouse); 84406 (Rat)
Alternate Names
3OST; 3OST1; 3-OST-1; 3OST1Heparan sulfate 3-O-sulfotransferase 1; EC 2.8.2; EC; h3-OST-1; heparan sulfate (glucosamine) 3-O-sulfotransferase 1; Heparan sulfate D-glucosaminyl 3-O-sulfotransferase 1; heparan sulfate glucosamine 3-O-sulfotransferase 1; heparin-glucosamine 3-O-sulfotransferase; HS3ST1

Citations for Recombinant Human HS3ST1 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.

2 Citations: Showing 1 - 2
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  1. Neurons Export Extracellular Vesicles Enriched in Cysteine String Protein and Misfolded Protein Cargo
    Authors: J Deng, C Koutras, J Donnelier, M Alshehri, M Fotouhi, M Girard, S Casha, PS McPherson, SM Robbins, JEA Braun
    Sci Rep, 2017;7(1):956.
    Species: Human
    Sample Types: Whole Tissue
    Applications: Bioassay
  2. Detection of specific glycosaminoglycans and glycan epitopes by in vitro sulfation using recombinant sulfotransferases.
    Authors: Wu ZL, Prather B, Ethen CM
    Glycobiology, 2011;21(5):625-33.
    Species: Bovine
    Sample Types: Protein
    Applications: Enzyme Assay


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