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Recombinant Human HPRT His-tag Protein, CF

Catalog # 10314-HP | R&D Systems, Inc. a Bio-Techne Brand
Catalog #
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Key Product Details


E. coli

Accession #




Enzyme Activity

Product Specifications


E. coli-derived human HPRT protein
with an N-terminal Met and 6-His tag


>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


Predicted Molecular Mass

25 kDa


27-29 kDa, under reducing conditions


Measured by its ability to produce GMP from guanine and phosphoribosyl pyrophosphate.
The specific activity  is >9000 pmol/min/μg, as measured under the described conditions.

Scientific Data Images for Recombinant Human HPRT His-tag Protein, CF

Recombinant Human HPRT His-tag Protein Enzyme Activity

Recombinant Human HPRT His-tag Protein Enzyme Activity

Recombinant Human HPRT Hig-tag (Catalog # 10314-HP) is measured by its ability to produce GMP from guanine and phosphoribosyl pyrophosphate. The activity (orange) is over 2-fold higher than the competitor's HPRT (blue).
Recombinant Human HPRT His-tag Protein SDS-PAGE

Recombinant Human HPRT His-tag Protein SDS-PAGE

2 μg/lane of Recombinant Human HPRT His-tag (Catalog # 10314-HP) was resolved with SDS-PAGE under reducing (R) and non-reducing (NR) conditions and visualized by Coomassie® Blue staining, showing bands at 27-29 kDa under reducing conditions.

Formulation, Preparation and Storage

Formulation Supplied as a 0.2 μm filtered solution in Tris, NaCl, Glycerol and TCEP.
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: HPRT

Hypoxanthine-guanine phosphoribosyltransferase (HPRT), a member of the phosphoribosyltransferase family, is a magnesium-dependent, cytoplasmic, ubiquitously-expressed (1) salvage enzyme involved in the primary pathway utilized for purine synthesis (2, 3). It catalyzes the transfer of phosphoribose from phosphoribosyl pyrophosphate to hypoxanthine and guanine bases to form inosine and guanine, respectively. Human HPRT forms a homotetramer of identical subunits that form dimer pairs (4, 5). Each 49 kDa subunit is 217 amino acids and consists of a core domain containing the active site and a hood domain (4, 5). HPRT deficiency in the salvage pathway leads to overproduction of purine, indicating it may play a role in regulation of purine production (6). Deficiency from multiple characterized single point mutations (7,8) causes hyperuricemia resulting in gout-like symptoms of Kelley-Seegmiller syndrome or if completely lacking in HPRT, a severe X-linked hereditary disorder, Lesch-Nyhan Disease, that is also characterized to cause significant neurological impairment (3, 6) by affecting multiple signaling pathways (9) and through dysregulation of cellular functions including proliferation, RNA metabolism, DNA replication and protein synthesis (3, 10). Given its ability to modulate cellular functions through purine regulation, HPRT is implicated to play a role in cancer. Significant correlation between HPRT mutations and increased cancer risk have been reported (11, 12). HPRT has been found surface-expressed in cancer (13) and thus has been proposed as a potential marker and therapeutic target (12).


  1. Melton, D. W. et al. (1986) Cell 44:319.
  2. Stout, J. T. et al. (1985) Ann. Rev. Genet. 19:127.
  3. Fasullo, M. and L. Endres. (2015) Int. J. Mol. Sci. 16:9431.
  4. Eads, J. C. et al. (1994) Cell 78:325.
  5. Keough, D.T. et al. (2005) J. Mol. Biol. 351:170.
  6. Garcia-Gil, M. et al. (2018) Int. J. Mol. Sci. 19: E3598.
  7. Torres, R. J. and J.G. Puig (2007) Orphanet J. Rare Dis. 2:48.
  8. Zoref-Shani, E. et al. (2000) BBA Mol. Basic Dis. 1500:197.
  9. Guibinga, G. H. et al. (2014) PLoS ONE 9:e96575.
  10. Kang. T. H. et al. (2013 PLoS ONE 8:e74967.
  11. Townsend, M. H. et al. (2017) Cancer Clin. Oncol. 6:19.
  12. Townsend, M. H. et al. (2018) Med. Oncol. 35:89.
  13. Townsend, M. H. et al. (2017) OncoTargets Ther. 10:1921.

Long Name

Hypoxanthine-Guanine Phosphoribosyltransferase

Alternate Names


Entrez Gene IDs

3251 (Human); 15452 (Mouse)

Gene Symbol



Product Documents for Recombinant Human HPRT His-tag Protein, CF

Certificate of Analysis

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Note: Certificate of Analysis not available for kit components.

Product Specific Notices for Recombinant Human HPRT His-tag Protein, CF

For research use only

Setting the standard in quality research reagents