Recombinant Human Aminopeptidase LRAP/ERAP2 Protein, CF

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R&D Systems Recombinant Proteins and Enzymes
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Recombinant Human Aminopeptidase LRAP/ERAP2 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 cleave the fluorogenic peptide substrate, Arg-7-amido-4-methylcoumarin (Arg-AMC). The specific activity is >50 pmol/min/µg, as measured under the described conditions.
Mouse myeloma cell line, NS0-derived human Aminopeptidase LRAP/ERAP2 protein
Ala56-Thr960, with an N-terminal 6-His tag
Accession #
N-terminal Sequence
Predicted Molecular Mass
105 kDa
122 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, 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.

Assay Procedure

  • Assay Buffer: 100 mM MES, pH 6.5
  • Recombinant Human Aminopeptidase LRAP/ERAP2 (Catalog # 3830-ZN)
  • Substrate: H-Arg-AMC (Bachem, Catalog # I-1050)
  • F16 Black Maxisorp Plate (Nunc, Catalog # 475515)
  • Fluorescent Plate Reader (Model: SpectraMax Gemini EM by Molecular Devices) or equivalent
  1. Dilute rhLRAP to 5 µg/mL in Assay Buffer.
  2. Dilute Substrate to 100 µM in Assay Buffer.
  3. Load 50 µL of 5 µg/mL rhLRAP into a plate, and start the reaction by adding 50 µL of 100 µM Substrate. Include a Substrate Blank containing 50 µL of Assay Buffer and 50 µL of Substrate.
  4. Read at excitation and emission wavelengths of 380 nm and 460 nm (top read), respectively, in kinetic mode for 5 minutes.
  5. Calculate specific activity:

     Specific Activity (pmol/min/µg) =

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

     *Adjusted for Substrate Blank

     **Derived using calibration standard 7-Amino-4-Methyl Coumarin (Sigma-Aldrich, Catalog # A9891). Per Well:

  • rhLRAP: 0.25 µg
  • Substrate: 50 µM
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: Aminopeptidase LRAP/ERAP2

Leukocyte-derived arginine aminopeptidase (LRAP) and endoplasmic reticulum-aminopeptidase 2 (ERAP2) are the two names given to the protein encoded by the LRAP gene (1, 2). Induced by interferon-gamma, LRAP is able to trim various MHC class I antigenic peptide precursors. It belongs to the oxytocinase subfamily of M1 aminopeptidases, which also includes aminopeptidases PILS/ARTS1/ERAP1 and LNPEP/PLAP (1, 3). In addition to antigen presentation, the members of this subfamily are also important in maintenance of pregnancy, memory retention, and blood pressure regulation (3).

  1. Tanioka, T. et al. (2003) J. Biol. Chem. 278:32275.
  2. Tanioka, T. et al. (2005) FEBS J. 272:916.
  3. Tsujimoto, M. and A. Hattori (2005) Biochim. Biophys. Acta 1751:9.
Long Name
Leukocyte-derived Arginine Aminopeptidase
Entrez Gene IDs
64167 (Human)
Alternate Names
Aminopeptidase LRAP; EC 3.4.11; EC; endoplasmic reticulum aminopeptidase 2; ERAP2; FLJ23633; FLJ23701; FLJ23807; Leukocyte-derived arginine aminopeptidase; LRAPL-RAPEC 3.4.11.-

Citation for Recombinant Human Aminopeptidase LRAP/ERAP2 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. ER-aminopeptidase 1 determines the processing and presentation of an immunotherapy-relevant melanoma epitope
    Authors: K Textoris-T, C Cammann, P Henklein, E Topfstedt, F Ebstein, S Henze, J Liepe, F Zhao, D Schadendor, B Dahlmann, W Uckert, A Paschen, M Mishto, U Seifert
    Eur. J. Immunol., 2019;0(0):.
    Species: Human
    Sample Types: Protein
    Applications: Enzyme Assay


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