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Gene Regulation

TransAM® IRF-3 and IRF-7

dna-binding ELISAs for activated IRF-3 and IRF-7 transcription factors

TransAM® Kits are DNA-binding ELISAs that facilitate the study of transcription factor activation in mammalian tissue and cell extracts. Assays are available for over 40 different targets (see the list at right). Each kit includes a 96-stripwell plate in which multiple copies of a specific double-stranded oligonucleotide have been immobilized. When nuclear or whole-cell extract is added, activated transcription factor of interest binds the oligonucleotide at its consensus binding site and is quantified using the included antibody, which is specific for the bound, active form of the transcription factor being studied. For complete details, click the TransAM® Method tab below.

TransAM® IRF Transcription Factor ELISA Kits

TransAM IRF Kits provide everything needed to study activated Interferon Regulatory Factors (IRFs), including a positive control extract. The TransAM IRF-3 and TransAM IRF-7 Kits are available for human samples. Click the IRF Info tab below for data and more information; kit manuals can be downloaded under the Documents tab.

Name Format Cat No. Price  
TransAM® IRF-3 (Human) 1 x 96 rxns 48396 $665 Buy Now
5 x 96 rxns 48896 $2,795 Buy Now
TransAM® IRF-7 1 x 96 rxns 50196 $665 Buy Now
5 x 96 rxns 50696 $2,795 Buy Now

IRF Transcription Factor Info

Interferon Regulatory Factors (IRFs) are a family of transcription factors involved in host defense via regulation of anti-viral immune responses, cell growth and hematopoietic development. IRF-3 is inactive in its cytoplasmic form, but upon phosphorylation by serine/threonine kinases it translocates to the nucleus and binds CREB binding protein (CREBBP) to form a complex known as dsRNA-activated factor 1 (DRAF1). This complex activates the transcription of interferon-induced genes under the control of the interferon-stimulated response element (ISRE). IRF-7 is activated by a phosphorylation event in response to infection, which leads to the activation of virus-inducible cellular genes.

Figure 1: Monitoring IRF activation with the TransAM IRF-3 (Human) Kit.

0.6 to 10 µg of poly (I/C) treated COS-7 cells were tested for IRF-3 activity using the TransAM IRF-3 (Human) Kit.

Figure 2: Monitoring IRF activation with the TransAM IRF-7 Kit.

40 ng to 0.6 µg of IRF-7 transfected COS-7 cells were tested for IRF-7 activity using the TransAM IRF-7 Kit.

The TransAM® transcription factor ELISA advantage

Historically, transcription factor studies have been conducted using gelshift, Western blot and reporter plasmid transfections, which are time-consuming, do not allow for high-throughput and provide only semi-quantitative results. TransAM assays are up to 100 times more sensitive than gelshift techniques, and can be completed in less than 5 hours. Because TransAM is an ELISA-based assay*, there is no radioactivity, and the high-throughput stripwell format enables simultaneous screening of 1-96 samples. Inconsistencies due to variable reporter plasmid transfections are eliminated, along with the need to construct stable cell lines.

Why use TransAM® transcription factor ELISAs?

  • Up to 100-fold more sensitive than gelshift assays
  • Eliminates the use of radioactivity and the need to run gels
  • Results in less than five hours
  • Colorimetric readout enables easy, quantitative analysis with spectrophotometry at 450 nm
  • 96-stripwell format enables both high and low throughput

How TransAM® transcription factor ELISAs work

The TransAM format is perfect for assaying transcription factor binding to a consensus-binding site. TransAM Kits contain a 96-stripwell plate to which the consensus-binding site oligo has been immobilized. Activated nuclear extract is added to each well and the transcription factor of interest binds specifically to this bound oligonucleotide. A primary antibody specific for an epitope on the bound and active form of the transcription factor is then added followed by subsequent incubation with secondary antibody and Developing Solution to provide an easily quantified, sensitive colorimetric readout (Figure 1).

Flow chart of the TransAM DNA binding transcription factor ELISA method for measurement of activated transcription factors
Figure 1: Flow chart of the TransAM process.

Activated transcription factor in the cell extract binds to the consensus-binding site on the oligo immobilized in the well. Incubation with the supplied primary and secondary antibodies specifically quantifies the amount of activated transcription factor.

* Technology covered under EAT-filed patents and licensed to Active Motif. Use of TransAM in NFκB-related drug discovery may be covered under U.S. Patent No. 6,150,090 and require a license from Ariad Pharmaceuticals (Cambridge, MA, USA).

Contents & Storage

One or five IRF 96-well plate(s) with plate sealer(s), IRF-3 or IRF-7 primary antibody, HRP-conjugated secondary antibody, IRF wild-type and mutated oligonucleotides, positive control cell extract, DTT, Protease Inhibitor Cocktail, Lysis, Binding, 10X Washing and 10X Antibody Binding Buffers, and Developing and Stop Solutions. Reagent storage conditions vary from room temperature to -80°C, see manual for details. All reagents are guaranteed stable for 6 months when stored properly.