Recombinant Human TPST1 Protein, CF

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Recombinant Human TPST1 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 PSGL-1 peptide (Gln-Ala-Thr-Glu-Tyr-Glu-Tyr-Leu-Asp-Tyr-Asp-Phe-Leu-Pro-Glu-Thr) The specific activity is >5 pmol/min/μg, as measured under the described conditions.
Mouse myeloma cell line, NS0-derived human Tyrosylprotein Sulfotransferase 1/TPST1 protein
Gln26-Glu370, with an N-terminal 6-His tag
Accession #
N-terminal Sequence
Predicted Molecular Mass
40 kDa
40-50 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 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

  • Assay Buffer: 25 mM MES, 0.5% (v/v) Triton® X-100, 2.5 mM MgCl2, 2.5 mM MnCl2, 1.25 mM CaCl2, 0.75 mg/mL BSA, pH 7.0
  • Gel Running Buffer: 40 mM Tris, 1 mM EDTA, adjust to pH 8.0 with acetic acid
  • Recombinant Human Tyrosylprotein Sulfotransferase 1/TPST1  (rhTPST1) (Catalog # 5468-ST)
  • 8% SDS-PAGE (approximately 15 cm x 20 cm, 20 lanes per gel)
  • PSGL-1 Peptide (Gln-Ala-Thr-Glu-Tyr-Glu-Tyr-Leu-Asp-Tyr-Asp-Phe-Leu-Pro-Glu-Thr), 5 mM in Assay Buffer
  • PAPS (Sigma, Catalog # A1651), 1 mM stock solution in 5% ethanol, 95% deionized water
  • PAP35S (prepared in-house) (7-9), ~1 μM in 5% ethanol, 95% deionized water
  • Gel loading buffer: 0.15 M Tris, 20.8 mM SDS, 1.15 M Glycine, 174 µM Bromophenol Blue, 30% Glycerol
  • Blotting paper (Fisher Scientific, Catalog # 05-714-4)
  • Gel dryer
  • Glogos® II autorad markers (Stratagene, Catalog # 420202) or equiv.
  • Blue sensitive medical X-ray film
  • X-ray film cassette
  • Film developer (Konica SRX-101A Medical Film Processor) or equiv.
  • Liquid scintillation counter (Beckman Coulter, Model # LS5000TD) or equiv.
  • Liquid scintillation fluid (Beckman Coulter, Catalog # 141349) or equiv.
  1. Dilute rhTPST1 to 100, 50, 25 and 12.5 µg/mL in Assay Buffer.
  2. Combine 10 µL PAPS, 10 µL PAP35S, 35 µL PSGL-1 peptide, and 85 µL deionized water (rxn mix sufficient for ~9 rxns).
  3. Combine 15 µL enzyme at each dil. with 15 µL rxn mix. Include a control containing 15 µL Assay Buffer and 15 µL rxn mix.
  4. Incubate at 37 °C for 20 minutes
  5. Add 15 µL gel loading buffer to each rxn. Mix.
  6. Load 30 µL of each rxn per lane on a gel. Leave empty lanes between samples.
  7. Run at 200 V for 25 minutes
  8. Transfer gel onto blotting paper and dry with gel dryer for 1 hr or until fully dry.
  9. Affix two autorad markers to the blotting paper next to the dried gel.
  10. In a darkroom expose dried gel to X-ray film by enclosing overnight in film cassette.
  11. After developing, use autorad markers to align X-ray film with gel.
  12. Determine where labeled product (slowest), unreacted PAP35S (intermediate), and free sulfate (fastest) migrated on the gel. For the control, identify the empty region where the product would have migrated if any had been produced.
  13. Cut out regions containing product and unreacted PAP35S.
  14. Place each region into a separate liquid scintillation vial.
  15. Add 5 mL liquid scintillation fluid to each vial.
  16. Use a liquid scintillation counter to count the amount of 35S in each vial.
  17. Calculate Activity for each rxn using the following equation. Plot Activity vs. μg per reaction, fit to linear regression. The slope of the fit equals the Specific Activity (pmol/min/μg):

     Activity (pmol/min) =

S (pmol) x Ci (counts)
Ct (counts) x time (min)
S = applied donor substrate Ci = incorporated radioisotope (product) Ct = total applied radioisotope (product plus unreacted PAP35S)
Per Reaction:
  • PAPS: 1000 pmol (pmol of PAP35S in the assay is negligible)
  • rhTPST1: 1.5, 0.75, 0.375 and 0.1875 μg
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: Tyrosylprotein Sulfotransferase 1/TPST1

Tyrosine O-sulfation is a posttranslational modification of proteins in all multicellular organisms. This reaction is mediated by a Golgi enzyme activity called Tyrosylprotein Sulfotransferase (TPST) that transfers sulfate from 3'-phosphoadenosine 5'-phosphosulfate (PAPS) to tyrosine residues within acidic motifs of polypeptides to form tyrosine O-sulfate ester (1). More than 60 proteins have been identified to be tyrosine sulfated, for some of which the functions have been identified. For example, sulfation of tyrosine residues in the leukocyte adhesion molecule P-selectin glycoprotein ligand 1 (PSGL-1) is required for binding to P-selectin on activated endothelium (2, 3). Tyrosine sulfation of chemokine receptors CCR5 and CXCR4 have been reported to facilitate HIV-1 entry of target cells (4, 5). Two TPSTs with overlapping substrate specificities are found in the human genome. TPST1 is widely expressed in all major tissues. The TPST1 knock-out mice showed phenotype of reduced body weight and increased postimplantation fetal death (6).

  1. Ouyang, Y. et al. (1998) Proc. Natl. Acad. Sci. USA 95:2896.
  2. Danan, L.M. et al. (2008) J. Am. Soc. Mass. Spectrom. 19:1459.
  3. Somers, W.S. et al. (2000) Cell 103:467.
  4. Choe, H. et al. (2003) Cell 114:161.
  5. Seibert, C. et al. (2008) Biochemistry 47:11251.
  6. Ouyang, Y.B. et al. (2002) J. Biol. Chem. 277:23781.
  7. Robbins, P.W. (1962) Methods in Enzymology, Vol. V, Academic Press, Inc., New York, 964.
  8. MacRae, I.J. et al. (2000) Biochemistry 39:1613.
  9. Wu, Z.L. et al. (2002) FASEB J. 16:539.
Entrez Gene IDs
8460 (Human); 22021 (Mouse); 288617 (Rat)
Alternate Names
EC; protein-tyrosine sulfotransferase 1; TPST1; Tyrosylprotein Sulfotransferase 1; tyrosylprotein sulfotransferase 1TPST-1; tyrosylprotein sulfotransferase-1

Product Specific Notices

Triton is a registered trademark of Union Carbide Corp. Glogos is registered trademark of Stratagene.

Citation for Recombinant Human TPST1 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.

1 Citation: Showing 1 - 1

  1. A versatile polyacrylamide gel electrophoresis based sulfotransferase assay.
    Authors: Wu ZL, Ethen CM, Larson S, Prather B, Jiang W
    BMC Biotechnol., 2010;10(0):11.
    Species: N/A
    Sample Types: Recombinant Protein
    Applications: Enzyme Assay


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Sulfotransferase Assays and Substrates

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