IL-28A, IL-28B, and IL-29, also named interferon-lambda 2 (IFN-lambda 2), IFN-lambda 3, and IFN-lambda 1, respectively, are class II cytokine receptor ligands that are distantly related to members of the IL-10 family (11-13% aa sequence identity) and type I IFN family (15-19% aa sequence identity) (1-3). The genes encoding these three cytokines are localized to chromosome 19 and each is composed of multiple exons. The exon organization of these genes is also found in the IL-10 family genes but is distinct from the type I IFNs, which are encoded within a single exon. The expression of IL-28A, B, and IL-29 is induced by virus infection or double-stranded RNA. All three cytokines exert bioactivities that overlap those of type I IFNs, including antiviral activity and up-regulation of MHC class I antigen expression. The three proteins signal through the same heterodimeric receptor complex that is composed of the IL-10 receptor beta (IL-10 R beta ) and a novel IL-28 receptor alpha (IL-28 R alpha, also known as IFN-lambda R1). Ligand binding to the receptor complex induces Jak kinase activation and STAT1 and STAT2 tyrosine phosphorylation. The phosphorylated STAT1 and STAT2 complex with IFN-regulatory factor 9 (IRF-9) to form the IFN-stimulated regulatory factor 3 (ISGF-3) transcription factor complex that is translocated to the nucleus. ISGF-3 binds to the IFN-stimulated response element (ISRE) present in the regulatory regions of the target genes. Human IL-28A cDNA encodes a 200 amino acid (aa) residue precursor protein with a putative 25 aa signal peptide. It shares 94% and 67% aa sequence identity with human IL-28B and human IL-29, respectively.
Recombinant Human IL-28A/IFN-lambda 2 Protein
R&D Systems | Catalog # 1587-IL
Key Product Details
- R&D Systems NS0-derived Recombinant Human IL-28A/IFN-lambda 2 Protein (1587-IL)
- 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
Accession Number
Applications
Product Specifications
Source
| Human IL-28A Val26-Val200 Accession # NP_742150 |
DI | 6-His tag |
| N-terminus | C-terminus |
Purity
Endotoxin Level
N-terminal Sequence Analysis
Predicted Molecular Mass
SDS-PAGE
Activity
The ED50 for this effect is 0.800-8.00 ng/mL.
Reviewed Applications
Read 1 review rated 4 using 1587-IL in the following applications:
Formulation, Preparation, and Storage
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.
Carrier: 1587-IL
| Formulation | Lyophilized from a 0.2 μm filtered solution in PBS with BSA as a carrier protein. |
| Reconstitution | Reconstitute at 100 μg/mL in sterile PBS containing at least 0.1% human or bovine serum albumin. |
| 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.
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Carrier Free: 1587-IL/CF
| Formulation | Lyophilized from a 0.2 μm filtered solution in PBS. |
| Reconstitution | Reconstitute at 100 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.
|
Calculators
Background: IL-28A/IFN-lambda 2
References
- Vilcek, J. (2003) Nature Immunol. 4:8.
- Sheppard, P. et al. (2003) Nature Immunol. 4:63.
- Kotenko, S.V. et al. (2003) Nature Immunol. 4:69.
Long Name
Alternate Names
Entrez Gene IDs
Gene Symbol
UniProt
Additional IL-28A/IFN-lambda 2 Products
Product Documents for Recombinant Human IL-28A/IFN-lambda 2 Protein
Certificate of Analysis
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Note: Certificate of Analysis not available for kit components.
Product Specific Notices for Recombinant Human IL-28A/IFN-lambda 2 Protein
For research use only
Related Research Areas
Citations for Recombinant Human IL-28A/IFN-lambda 2 Protein
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Customer Reviews for Recombinant Human IL-28A/IFN-lambda 2 Protein (1)
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Application: Immunoassay StandardVerified Customer | Posted 06/01/2018This recombinant IFN-lambda 2 protein was combined with IFN-lambda 1 (1598-IL) to serve as the calibrator in a pan specific IFN-lambda assay using MAB15981 and BAF1598 as the matched pair antibodies.
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Associated Pathways
