Recombinant Human SPR His-tag Protein, CF

R&D Systems | Catalog # 10209-SP

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Key Product Details

  • R&D Systems E. coli-derived Recombinant Human SPR His-tag Protein (10209-SP)
  • 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

E. coli

Accession Number

P35270

Applications

Enzyme Activity
View all SPR Proteins and Enzymes »

Product Specifications

Source

E. coli-derived human SPR protein
Met1-Lys261
with a C-terminal 6-His tag

Purity

>90%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.

Endotoxin Level

<0.10 EU per 1 μg of the protein by the LAL method.

N-terminal Sequence Analysis

Met1

Predicted Molecular Mass

29 kDa

SDS-PAGE

28 kDa under reducing conditions

Activity

Measured by its ability to catalyze the reduction of phenanthrenequinone.
The specific activity is >700 pmol/min/μg, as measured under the described conditions.

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

Recombinant Human SPR His-tag Protein Enzyme Activity

Recombinant Human SPR His-tag Protein Enzyme Activity

Recombinant Human SPR His-tag Protein (Catalog # 10209-SP) is measured by its ability to catalyze the reduction of phenanthrenequinone.
Recombinant Human SPR His-tag Protein SDS-PAGE

Recombinant Human SPR His-tag Protein SDS-PAGE

2 μg/lane of Recombinant Human SPR His-tag was resolved with SDS-PAGE under reducing (R) and non-reducing (NR) conditions and visualized by Coomassie® Blue staining, showing a band at 28 kDa under reducing conditions.

Formulation, Preparation, and Storage

10209-SP
Formulation Supplied as a 0.2 μm filtered solution in Tris, NaCl and Glycerol.
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: SPR

Sepiapterin reductase (SPR) catalyzes the biosynthesis of tetra-hydrobiopterin (BH4), an important cofactor in aromatic amino acid metabolism and key regulator of nitric oxide biosynthesis which relates the BH4 cofactor to many pathophysiological processes (1, 2). SPR has additionally been shown to be efficient at mediating chemical redox cycling of quinones and herbicides through a mechanism distinct from sepiapterin reduction (3). SPR is an NADPH-dependent, cytoplasmic enzyme classified as a member of the short-chain dehydrogenase/reductase (SDR) family based on its structural catalytic domain and NADPH binding motifs (4). SPR forms an active homodimer where each monomer contains a key c-terminal asparagine required for activity (3) in addition to the conserved catalytic triad that serves to stabilize protein structure while maintaining cofactor and substrate proximity in a catalytic site composed of several hydrophobic amino acids (4-6). SPR contains the conserved NADPH binding motif at the N-terminus (4-6). SPR has broad tissue expression (7). Identified human mutations in SPR result in compromised production of biopterin cofactor and are associated with neurological deficits (8, 9) linked to dystonia (8, 10). Knockout in mice likewise results in reduced neurotransmitters and movement disorders (11). Loss of BH4 can also reduce nitric oxide production leading to alterations in cardiac function and inflammation (2). SPR has been pharmacologically targeted to reduce pathologically elevated BH4 for pain management (12, 13) and to regulate T-cell function in pathological diseases and tumor growth (14).

References

  1. Werner, E.R. et al. (2011) Biochem. J 348:397.
  2. Bendall, J. K. et al. (2014) Antiox. Redox. Signal 20:3040.
  3. Yang, S. et al. (2013) J. Biol. Chem. 288:19222.
  4. Jornvall, H. et al. (1995) Biochemistry 34:6003.
  5. Auerbach, G. et al. (1997) EMBO J. 16:7219.
  6. Fujimoto, K. et al. (2001) Chem. Biol. Interact. 130:825.
  7. Katoh, S. (1971) Arch. Biochem. Biophys. 146:202.
  8. Bonafe, L. et al. (2001) Am. J. Hum. Genet 69:269.
  9. Farrugia, R. et al. (2007) Mol. Genet. Metab. 90:277.
  10. Abeling, N.G. et al. (2006) Mol. Genet. Metab. 89:116.
  11. Yang, S. et al. (2006) Am. J. Hum. Genet. 78:575.
  12. Latremoliere, A. et al. (2015) Neuron. 86:1393.
  13. Fujita, M. et al. (2019) Arthritis Rheumatol. [Epub ahead of print]
  14. Cronin, S.J.F. et al. (2018) Nature. 563:7732.

Long Name

Sepiapterin Reductase

Alternate Names

EC 1.1.1.153, Gm10328, SDR38C1

Entrez Gene IDs

6697 (Human); 20751 (Mouse)

Gene Symbol

SPR

UniProt

P35270

Additional SPR Products

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

Certificate of Analysis

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

For research use only

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Protocols

View specific protocols for Recombinant Human SPR His-tag Protein, CF (10209-SP):

Materials
  • Assay Buffer: 50 mM Potassium Phosphate, 150 mM NaCl, pH 6.0
  • Recombinant Human SPR His-tag (rhSPR) (Catalog # 10209-SP)
  • Substrate: 9,10-Phenanthrenequinone (PQ) (Sigma, Catalog # 156507), 5 mM stock in N,N-Dimethylformamide (DMF)
  • beta -Nicotinamide adenine dinucleotide phosphate reduced, tetrasodium salt ( beta -NADPH) (Sigma, Catalog# N7505), 10 mM stock in deionized water
  • 96-well clear plate (Catalog # DY990)
  • Fluorescent Plate Reader (Model: SpectraMax Plus by Molecular Devices) or equivalent
  1. Dilute rhSPR to 10 µg/mL in Assay Buffer.
  2. Prepare Substrate Mixture containing 200 µM PQ and 800 µM beta -NADPH in Assay Buffer.
  3. Load 50 µL of 10 µg/mL rhSPR into a plate, and start the reaction by adding 50 µL of Substrate Mixture.  Include a Substrate Blank containing 50 µL Assay Buffer and 50 µL of Substrate Mixture.
  4. Read at an absorbance of 340 nm, respectively, in kinetic mode of 5 minutes.
  5. Calculate specific activity:

     Specific Activity (pmol/min/µg) =

Adjusted Vmax* (OD/min) x well volume (L) x 1012 pmol/mol x -1
ext. coeff** (M-1cm-1) x path corr.*** (cm) x amount of enzyme (µg)

  *Adjusted for Substrate Blank
**Using the extinction coefficient 6270 M-1cm-1
***Using the path correction 0.32 cm
Note: the output of many spectrophotometers is in mOD

Per Well:

  • rhSPR: 0.5 µg
  • PQ: 100 µM
  • beta -NADPH: 400 µM

FAQs

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