Recombinant Mouse IL-28 R alpha/IFN-lambda R1 Fc Chimera, CF

Catalog # Availability Size / Price Qty
5384-MR-050
R&D Systems Recombinant Proteins and Enzymes
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Recombinant Mouse IL-28 R alpha/IFN-lambda R1 Fc Chimera, CF Summary

Product Specifications

Purity
>95%, 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.
Activity
Measured by its binding ability in a functional ELISA. 1 μg/mL of Recombinant Mouse IL-28 R alpha /IFN-lambda  R1 Fc Chimera was mixed with serially diluted Recombinant Mouse (rm) IL-28B/IFN-lambda 3 (Catalog # 1789-ML). Following incubation, the IL-28 R alpha rmIL-28B complex was captured in a goat anti-mFc-coated plate. Bound IL-28B was measured using biotinylated goat anti-mIL-28B. The concentration of rmIL-28B that produces 50% of the optimal binding was found to be approximately 0.7-3.5 μg/mL.
Source
Mouse myeloma cell line, NS0-derived mouse IL-28 R alpha/IFN-lambda R1 protein
Mouse IL-28 R alpha
(Arg21-Ala227)
Accession # AAH57856
IEGRMDP Mouse IgG2A
(Glu98-Lys330)
N-terminus C-terminus
Accession #
N-terminal Sequence
Analysis
Arg21
Structure / Form
Disulfide-linked homodimer
Predicted Molecular Mass
50.6 kDa (monomer)
SDS-PAGE
62-70 kDa, reducing conditions

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5384-MR

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.

5384-MR

Formulation Lyophilized from a 0.2 μm filtered solution in PBS.
Reconstitution Reconstitute at 200 μg/mL in sterile PBS.
Shipping The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below.
Stability & Storage: Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  • 12 months from date of receipt, -20 to -70 °C as supplied.
  • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
  • 3 months, -20 to -70 °C under sterile conditions after reconstitution.
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Background: IL-28 R alpha/IFN-lambda R1

IL-28 R alpha (IL-28 receptor alpha subunit; also named interferon-lambda R1) is a type I transmembrane glycoprotein that is cytokine receptor family 2 member 12 (CRF2-12) (1-4). It pairs with the IL-10 receptor beta subunit (IL-10 R beta, CRF2-4) to form the IL-28 R (1-4). Each subunit of this receptor can interact with the interferon-like cytokines (type III interferons) IL-28A (IFN-lambda 2), IL-28B (IFN-lambda 3) and IL-29 (IFN-lambda 1). Mouse IL 28A and IL-28B share 97% amino acid (aa) identity; rodents do not express IL-29 (1-4). Mouse IL-28 R alpha cDNA encodes a 535 aa protein with a 20 aa signal peptide, a 207 aa extracellular domain (ECD) with a fibronectin type III motif and four potential N-glycosylation sites, a 21 aa transmembrane sequence, and a proline-rich and acidic 287 aa cytoplasmic domain. A 254 aa splice variant of mouse IL 28 R alpha diverges at aa 224 and lacks a transmembrane sequence (3, 5). The mature mouse IL-28 R alpha ECD shares 83%, 67%, 64% and 63% aa sequence identity with rat, human, canine and bovine IL-28 Ra, respectively. Mouse IL-28 R will respond to human IL-28A (6). IL-28 R is constitutively expressed in most tissues, but its ligands are mainly produced by antigen presenting cells in response to viruses and their products (2-6). Signaling through IL-28 R alpha is similar to that of receptors for type I IFNs and involve tyrosine phosphorylation, activation of JAK tyrosine kinases, STAT phosphorylation and formation of the IFN-stimulated regulatory factor 3 (ISGF-3) transcription factor complex (1-7). This signaling pathway induces antiviral activity and up-regulates MHC class I antigen expression (2-7). Anti-proliferative activity has also been shown for IL-28/IL-28 R (7).

References
  1. Chen, Q. et al. (2006) Vitam. Horm. 74:207.
  2. Meager, A. et al. (2005) Cytokine 31:109.
  3. Sheppard, P. et al. (2003) Nat. Immunol. 4:63.
  4. Kotenko, S.V. et al. (2003) Nat. Immunol. 4:69.
  5. Entrez Accession # EDL29971.
  6. Lasfar, A. et al. (2006) Cancer Res. 66:4468.
  7. Dumoutier, L. et al. (2004) J. Biol. Chem. 279:32269.
Long Name
Interleukin 28 Receptor alpha
Entrez Gene IDs
163702 (Human); 242700 (Mouse); 362628 (Rat)
Alternate Names
class II cytokine receptor CRF2/12; CRF2/12; CRF2-12; Cytokine receptor class-II member 12; Cytokine receptor family 2 member 12; IFN-lambda R1; IFN-lambda receptor 1; IFN-lambda-R1; IFNLR; IFNLR1; IL-28 R alpha; IL-28 receptor subunit alpha; IL28R alpha; IL-28R1; IL28RA; IL-28Ra; IL-28R-alpha; Interferon lambda receptor 1; interferon lambda, receptor 1; interleukin 28 receptor A; interleukin 28 receptor, alpha (interferon, lambda receptor); interleukin 28 receptor, alpha; interleukin or cytokine receptor 2; interleukin-28 receptor subunit alpha; LICR2; Likely interleukin or cytokine receptor 2

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