Recombinant Human CHST1 Protein, CF

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Recombinant Human CHST1 Protein, CF Summary

Product Specifications

>95%, 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 alpha -Lactose. The specific activity is >500 pmol/min/μg, as measured under the described conditions.
Chinese Hamster Ovary cell line, CHO-derived human Carbohydrate Sulfotransferase 1/CHST1 protein
Arg24-Ser411, with an N-terminal 6-His tag
Accession #
N-terminal Sequence
Predicted Molecular Mass
45 kDa
58 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, 500 mM NaCl, 15 mM MgCl2, pH 7.5
  • Recombinant Human Carbohydrate Sulfotransferase 1/CHST1 (rhCHST1) (Catalog # 5316-ST)
  • 3'-Phosphoadenosine-5'-phosphosulfate/PAPS (Catalog # ES019)
  • alpha -lactose (Sigma, Catalog # L2643), 0.3 M stock in deionized water
  • Universal Sulfotransferase Activity Kit (Catalog # EA003)
  • 96-well Clear Plate (Costar, Catalog # 92592)
  • Plate Reader (Model: SpectraMax Plus by Molecular Devices) or equivalent
  1. Dilute 1 mM Phosphate Standard provided by the Universal Sulfotransferase Kit by adding 40 µL of the 1 mM Phosphate Standard to 360 µL of Assay Buffer for a 100 µM stock.
  2. Prepare standard curve by performing six one-half serial dilutions of the 100 µM Phosphate stock in Assay Buffer. The standard curve has a range of 0.078 to 5 nmol per well.
  3. Prepare reaction mixture containing 0.4 mM PAPS, 200 mM alpha -lactose, and 40 μg/mL Coupling Phosphatase 3 in Assay Buffer.
  4. Dilute rhCHST1 to 6 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 the 6 µg/mL rhCHST1 into the plate. Include a Control containing 25 µL of Assay Buffer.
  7. Add 25 µL of reaction mixture to the wells, excluding the standard curve.
  8. Cover the plate with a plate sealer 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 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) x coupling rate** 

     *Derived from the phosphate standard curve using linear or 4-parameter fitting and adjusted for Control.           
     **Coupling rate is 0.49 for conditions described.

Per Reaction:
  • rhCHST1: 0.15 μg
  • Coupling Phosphatase 3: 1.0 μg
  • PAPS: 0.2 mM
  • alpha –lactose: 100 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: Carbohydrate Sulfotransferase 1/CHST1

The CHST family is comprised of 14 enzymes in humans. All members of this family are Golgi-localized type II membrane proteins. Only the luminal and enzymatic domain is expressed in each of our recombinant CHST proteins. These enzymes transfer sulfate (i.e., sulfonate) onto the 6-O or 4-O positions of GalNAc, Gal and GlcNAc residues on glycoproteins, proteoglycans and glycolipids (1). This sulfation often creates specific epitopes that can be recognized by extracellular matrix proteins, cell surface receptors and viruses (2). CHST1, also known as keratan sulfate Gal-6 sulfotransferase, transfers sulfate to position 6 of galactose residues on keratan sulfate (3). It also has sulfotransferase activity on sialyl N-acetyllactosamine structures and participates in biosynthesis of selectin ligands that play a central role in lymphocyte homing at sites of inflammation (4). Human CHST1 shares 94% amino acid sequence identity with mouse CHST1. The activity of the recombinant human CHST1 is measured using a PAP-specific phosphatase-coupled sulfotransferase assay (5).

  1. Hemmerich, S. and S.D. Rosen (2000) Glycobiology 10:849.
  2. Bowman, K.G. and C.R. Bertozzi (1999) Chem. Biol. 5:447.
  3. Fukuta, M. et al. (1997) J. Biol. Chem. 272:32321.
  4. Yamada, T. et al. (2004) Biochem. J. 384: 567.
  5. Prather, B. et al. (2012) Anal Biochem. 423:86.
Entrez Gene IDs
8534 (Human); 76969 (Mouse); 295934 (Rat)
Alternate Names
6-O-sulfotransferase 1; C6ST; carbohydrate (chondroitin 6/keratan) sulfotransferase 1; carbohydrate (keratan sulfate Gal-6) sulfotransferase 1; Carbohydrate Sulfotransferase 1; CHST1; EC 2.8.2; Galactose/N-acetylglucosamine/N-acetylglucosamine 6-O-sulfotransferase 1; GST-1; Keratan sulfate Gal-6 sulfotransferase; KS6ST; KSGal6ST; KSGal6STEC; KSST

Citations for Recombinant Human CHST1 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. Influence of sulfonated and diet-derived human milk oligosaccharides on the infant microbiome and immune markers
    Authors: C Quin, SD Vicaretti, NA Mohtarudin, AM Garner, DM Vollman, DL Gibson, WF Zandberg
    J. Biol. Chem., 2020;0(0):.
    Applications: Enzyme Assay
  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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