Recombinant Human Myeloperoxidase Protein, CF

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Recombinant Human Myeloperoxidase Protein, CF Summary

Product Specifications

>90%, 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.
Measured by its ability to oxidize guaiacol in the presence of hydrogen peroxide. Capeillere-Blandin, C. (1998) Biochem J. 336 :395. The specific activity is >50,000 pmol/min/µg, as measured under the described conditions.
Mouse myeloma cell line, NS0-derived human Myeloperoxidase/MPO protein
Ala49-Ser745, with a C-terminal 10-His tag
Accession #
N-terminal Sequence
Predicted Molecular Mass
80 kDa
74-106 kDa, under 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 Lyophilized from a 0.2 μm filtered solution in Tris and NaCl.
Reconstitution Reconstitute at 0.5-1 mg/mL in sterile, deionized water.
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 reconstitution.

Assay Procedure

  • Assay Buffer: 50 mM NaH2PO4, pH 7.0
  • Recombinant Human Myeloperoxidase/MPO (rhMPO) (Catalog # 3174-MP)
  • Hydrogen Peroxide Solution, 30% (v/v) (H2O2) (Sigma, Catalog # H1009)
  • Guaiacol (Acros Organics, Catalog # AC120192500)
  • Clear StripWell Microplate (Costar, Catalog # 92592)
  • Plate Reader with Absorbance reading capability (Model: Spectramax Plus by Molecular Devices) or equivalent
  1. Prepare 100 mM guaiacol in Assay Buffer by shaking or stirring for 30 minutes at room temperature prior to use. Note: Protect guaiacol solution from light.
  2. Dilute rhMPO to 1 µg/mL in Assay Buffer.
  3. Dilute hydrogen peroxide from 30% to 0.00667% in Assay Buffer.
  4. Load in a clear microplate 20 µL of 1 µg/mL of rhMPO and 30 µL 0.00667% hydrogen peroxide, and start the reaction by adding 50 µL of 100 mM guaiacol.
  5. Read at 470 nm in kinetic mode for 5 minutes.
  6. Calculate specific activity:

     Specific Activity (pmol/min/µg) =

Adjusted Vmax* (OD/min) x Conversion Factor** (pmol/OD)
amount of enzyme (µg)

*Adjusted for Substrate Blank
**Derived using known concentrations of hydrogen peroxide ranging from 20 to 300 µM. Each point contains 10 µg/mL of rhMPO (an amount so that the reaction will be completed in a short period of time) and 50 mM guaiacol. After each reaction is complete, the product is measured at 470 nm (read endpoint about every 20 seconds to find the maximum absorbance for each point). The maximum values of Abs470 (y-axis) and pmol of hydrogen peroxide (x axis) for each point is plotted linearly (y = mx + b) and the slope is calculated (m). The conversion factor is derived from the following equation as a unit of pmol/OD. It is multiplied by 2 because one mol of hydrogen peroxide is equal to two mol of oxidized guaicol (product).

Conversion Factor = (1/slope(m)) x 2 = pmol/OD

Per Well:
  • rhMPO: 0.020 μg
  • Hydrogen Peroxide: 0.002%
  • Guaiacol: 50 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: Myeloperoxidase/MPO

Myeloperoxidase (MPO) is a heme-containing enzyme belonging to the XPO subfamily of peroxidases. It is an abundant neutrophil and monocyte glycoprotein that catalyzes the hydrogen peroxide-dependent conversion of chloride, bromide, and iodide to multiple reactive species (1). Post-translational processing of MPO involves the insertion of a heme moiety and the proteolytic removal of both a propeptide and a 6 aa internal peptide (2). This results in a disulfide-linked dimer composed of a 60 kDa heavy and 12 kDa light chain that associate into a 150 kDa enzymatically active tetramer. The tetramer contains two heme groups and one disulfide bond between the heavy chains (2). Alternate splicing generates two additional isoforms of MPO, one with a 32 aa insertion in the light chain, and another with a deletion of the signal sequence and part of the propeptide (3). Human and mouse MPO share 87% aa sequence identity. MPO activity results in protein nitrosylation and the formation of 3-chlorotyrosine and dityrosine crosslinks (4‑6). Modification of ApoB100, as well as the lipid and cholesterol components of LDL and HDL, promotes the development of atherosclerosis (5, 7‑9). MPO is also associated with a variety of other diseases (1), and inhibits vasodilation in inflammation by depleting the levels of NO (10). Serum albumin functions as a carrier protein during MPO movement to the basolateral side of epithelial cells (11). MPO is stored in neutrophil azurophilic granules. Upon cellular activation, it is deposited into pathogen-containing phagosomes (2). While mice lacking MPO are impaired in clearing select microbial infections, MPO deficiency in humans does not necessarily result in heightened susceptibility to infections (12, 13).

  1. Klebanoff, S.J. (2005) J. Leukoc. Biol. 77:598.
  2. Hansson, M. et al. (2006) Arch. Biochem. Biophys. 445:214.
  3. Hashinaka, K. et al. (1988) Biochemistry 27:5906.
  4. van Dalen, C.J. et al. (2000) J. Biol. Chem. 275:11638.
  5. Hazen, S.L. and J.W. Heinecke (1997) J. Clin. Invest. 99:2075.
  6. Heinecke, J.W. et al. (1993) J. Clin. Invest. 91:2866.
  7. Podrez, E.A. et al. (1999) J. Clin. Invest. 103:1547.
  8. Bergt, C. et al. (2004) Proc. Natl. Acad. Sci. 101:13032.
  9. Hazen, S.L. et al. (1996) J. Biol. Chem. 271:23080.
  10. Eiserich, J.P. et al. (2002) Science 296:2391.
  11. Tiruppathi, C. et al. (2004) Proc. Natl. Acad. Sci. 101:7699.
  12. Aratani Y. et al. (2000) J. Infect. Dis. 182:1276.
  13. Kutter, D. (1998) J. Mol. Med. 76:669.
Entrez Gene IDs
4353 (Human); 17523 (Mouse); 303413 (Rat)
Alternate Names
EC 1.11.1; EC; MPO; Myeloperoxidase

Citations for Recombinant Human Myeloperoxidase 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.

8 Citations: Showing 1 - 8
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  1. Immune Regulation of Mammary Fibroblasts and the Impact of Mammographic Density
    Authors: M Archer, P Dasari, D Walsh, KL Britt, A Evdokiou, WV Ingman
    Journal of Clinical Medicine, 2022;11(3):.
    Species: Human
    Sample Types: Whole Cells
    Applications: Bioassay
  2. DNA interstrand cross-links induced by the major oxidative adenine lesion 7,8-dihydro-8-oxoadenine
    Authors: AL Rozelle, Y Cheun, CK Vilas, MC Koag, S Lee
    Nature Communications, 2021;12(1):1897.
    Species: N/A
    Sample Types: DNA
    Applications: Bioassay
  3. Response of Human Neutrophil Granulocytes to the Hyphae of the Emerging Fungal Pathogen Curvularia lunata
    Authors: EJ Tóth, M Varga, M Takó, M Homa, O Jáger, E Hermesz, H Orvos, G Nagy, C Vágvölgyi, T Papp
    Pathogens, 2020;9(3):.
    Species: Human
    Sample Types: Reference Standard
    Applications: Bioassay
  4. A Structurally Dynamic N-terminal Region Drives Function of the Staphylococcal Peroxidase Inhibitor (SPIN)
    Authors: NWM de Jong, NT Ploscariu, KX Ramyar, BL Garcia, AI Herrera, O Prakash, BB Katz, KG Leidal, WM Nauseef, KPM van Kessel, JAG van Strijp, BV Geisbrecht
    J. Biol. Chem., 2018;0(0):.
    Species: N/A
    Sample Types: Recombinant Protein
    Applications: Bioassay
  5. Identification and structural characterization of a novel myeloperoxidase inhibitor from Staphylococcus delphini
    Authors: NT Ploscariu, NWM de Jong, KPM van Kessel, JAG van Strijp, BV Geisbrecht
    Arch. Biochem. Biophys., 2018;645(0):1-11.
    Species: Bacteria - Staphylococcus aureus
    Sample Types: Recombinant Protein
    Applications: Characterization
  6. Immune evasion by a staphylococcal inhibitor of myeloperoxidase
    Authors: NWM de Jong, KX Ramyar, FE Guerra, R Nijland, C Fevre, JM Voyich, AJ McCarthy, BL Garcia, KPM van Kessel, JAG van Strijp, BV Geisbrecht, PA Haas
    Proc. Natl. Acad. Sci. U.S.A., 2017;0(0):.
    Species: Bacteria - Staphylococcus aureus
    Sample Types: Cell Culture Supernates
    Applications: Bioassay
  7. Gut Microbiota Conversion of Dietary Ellagic Acid into Bioactive Phytoceutical Urolithin A Inhibits Heme Peroxidases
    PLoS ONE, 2016;11(6):e0156811.
    Species: Human
    Sample Types: Protein
    Applications: Enzyme Assay
  8. A novel zebrafish model to provide mechanistic insights into the inflammatory events in carrageenan-induced abdominal edema.
    Authors: Huang S, Feng C, Hung H, Chakraborty C, Chen C, Chen W, Jean Y, Wang H, Sung C, Sun Y, Wu C, Liu W, Hsiao C, Wen Z
    PLoS ONE, 2014;9(8):e104414.
    Species: N/A
    Sample Types: N/A
    Applications: Western Blot


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Reviews for Recombinant Human Myeloperoxidase Protein, CF

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Recombinant Human Myeloperoxidase Protein, CF
By Anonymous on 11/07/2018
Application: Immunoassay Standard

The protein was used as a calibrator in an in vitro immunoassay.

Recombinant Human Myeloperoxidase Protein, CF
By Vishal Singh on 05/23/2016
Application: Use as standard in in vitro MPO activity assays.
Reason for Rating: Very stable protein