Description
IRF-3 (Phospho-Ser396)Colorimetric Cell-Based ELISA Kit
The IRF-3 (phospho-Ser396) Colorimetric Cell-Based ELISA Kit is a powerful tool for detecting and quantifying phosphorylated IRF-3 levels in cell lysates. This kit provides high sensitivity and specificity, allowing for accurate and reproducible results in a variety of research settings.IRF-3 is a key transcription factor involved in the immune response to viral infections, regulating the expression of genes critical for antiviral defense. Phosphorylation of IRF-3 at Ser396 is a crucial step in its activation, leading to the production of type I interferons and other antiviral cytokines.
By measuring phosphorylated IRF-3 levels, researchers can gain valuable insights into the immune response to viral infections and identify potential targets for antiviral therapies. The IRF-3 (phospho-Ser396) Colorimetric Cell-Based ELISA Kit is an essential tool for studying the role of IRF-3 in immune signaling pathways and developing novel strategies for treating viral diseases.
| Product Name: | IRF-3 (Phospho-Ser396)Colorimetric Cell-Based ELISA Kit |
| Product Code: | CBCAB00013 |
| ELISA Type: | Cell-Based |
| Target: | IRF-3 (Phospho-Ser396) |
| Reactivity: | Human, Mouse, Rat |
| Dynamic Range: | > 5000 Cells |
| Detection Method: | Colorimetric 450 nm |
| Format: | 2 x 96-Well Microplates |
The IRF-3 (Phospho-Ser396) Colorimetric Cell-Based ELISA Kit is a convenient, lysate-free, high throughput and sensitive assay kit that can detect IRF-3 protein phosphorylation and expression profile in cells. The kit can be used for measuring the relative amounts of phosphorylated IRF-3 in cultured cells as well as screening for the effects that various treatments, inhibitors (ie. siRNA or chemicals), or activators have on IRF-3 phosphorylation.
Qualitative determination of IRF-3 (Phospho-Ser396) concentration is achieved by an indirect ELISA format. In essence, IRF-3 (Phospho-Ser396) is captured by IRF-3 (Phospho-Ser396)-specific primary antibodies while the HRP-conjugated secondary antibodies bind the Fc region of the primary antibody. Through this binding, the HRP enzyme conjugated to the secondary antibody can catalyze a colorimetric reaction upon substrate addition. Due to the qualitative nature of the Cell-Based ELISA, multiple normalization methods are needed:
| 1. | A monoclonal antibody specific for human GAPDH is included to serve as an internal positive control in normalizing the target absorbance values. |
| 2. | Following the colorimetric measurement of HRP activity via substrate addition, the Crystal Violet whole-cell staining method may be used to determine cell density. After staining, the results can be analysed by normalizing the absorbance values to cell amounts, by which the plating difference can be adjusted. |
| Database Information: | Gene ID: 3661, UniProt ID: Q14653, OMIM: 603734, Unigene: Hs.75254 |
| Gene Symbol: | IRF3 |
| Sub Type: | Phospho |
| UniProt Protein Function: | IRF3: interferon regulatory factor 3, a member of the interferon regulatory transcription factor (IRF) family. IRF3 is found in an inactive cytoplasmic form that upon serine/threonine phosphorylation forms a complex with CREBBP. This complex translocates to the nucleus and activates the transcription of interferons alpha and beta, as well as other interferon-induced genes. |
| UniProt Protein Details: | Protein type:DNA-binding; Transcription factor Chromosomal Location of Human Ortholog: 19q13.3-q13.4 Cellular Component: nucleoplasm; cytoplasm; nucleus; cytosol Molecular Function:identical protein binding; protein binding; protein homodimerization activity; DNA binding; transcription cofactor activity; transcription factor activity Biological Process: transcription from RNA polymerase II promoter; negative regulation of interferon-beta biosynthetic process; positive regulation of I-kappaB kinase/NF-kappaB cascade; viral reproduction; apoptosis; MyD88-independent toll-like receptor signaling pathway; cytokine and chemokine mediated signaling pathway; toll-like receptor 3 signaling pathway; negative regulation of transcription from RNA polymerase II promoter; negative regulation of defense response to virus by host; response to exogenous dsRNA; positive regulation of interferon type I production; lipopolysaccharide-mediated signaling pathway; toll-like receptor signaling pathway; positive regulation of interferon-beta production; innate immune response; interferon type I biosynthetic process; defense response to virus; toll-like receptor 4 signaling pathway; response to DNA damage stimulus; negative regulation of interferon type I production; positive regulation of interferon-alpha production; positive regulation of cytokine secretion Disease: Herpes Simplex Encephalitis, Susceptibility To, 7 |
| NCBI Summary: | This gene encodes a member of the interferon regulatory transcription factor (IRF) family. The encoded protein is found in an inactive cytoplasmic form that upon serine/threonine phosphorylation forms a complex with CREBBP. This complex translocates to the nucleus and activates the transcription of interferons alpha and beta, as well as other interferon-induced genes. Alternatively spliced transcript variants encoding multiple isoforms have been observed for this gene. [provided by RefSeq, Nov 2011] |
| UniProt Code: | Q14653 |
| NCBI GenInfo Identifier: | 2497442 |
| NCBI Gene ID: | 3661 |
| NCBI Accession: | Q14653.1 |
| UniProt Secondary Accession: | Q14653,Q5FBY1, Q5FBY2, Q5FBY4, Q7Z5G6, A8K7L2, B2RAZ3 |
| UniProt Related Accession: | Q14653 |
| Molecular Weight: | 12,330 Da |
| NCBI Full Name: | Interferon regulatory factor 3 |
| NCBI Synonym Full Names: | interferon regulatory factor 3 |
| NCBI Official Symbol: | IRF3 |
| NCBI Protein Information: | interferon regulatory factor 3 |
| UniProt Protein Name: | Interferon regulatory factor 3 |
| Protein Family: | Interferon regulatory factor |
| UniProt Gene Name: | IRF3 |
| UniProt Entry Name: | IRF3_HUMAN |
| Component | Quantity |
| 96-Well Cell Culture Clear-Bottom Microplate | 2 plates |
| 10X TBS | 24 mL |
| Quenching Buffer | 24 mL |
| Blocking Buffer | 50 mL |
| 15X Wash Buffer | 50 mL |
| Primary Antibody Diluent | 12 mL |
| 100x Anti-Phospho Target Antibody | 60 µL |
| 100x Anti-Target Antibody | 60 µL |
| Anti-GAPDH Antibody | 60 µL |
| HRP-Conjugated Anti-Rabbit IgG Antibody | 12 mL |
| HRP-Conjugated Anti-Mouse IgG Antibody | 12 mL |
| SDS Solution | 12 mL |
| Stop Solution | 24 mL |
| Ready-to-Use Substrate | 12 mL |
| Crystal Violet Solution | 12 mL |
| Adhesive Plate Seals | 2 seals |
The following materials and/or equipment are NOT provided in this kit but are necessary to successfully conduct the experiment:
- Microplate reader able to measure absorbance at 450 nm and/or 595 nm for Crystal Violet Cell Staining (Optional)
- Micropipettes with capability of measuring volumes ranging from 1 µL to 1 ml
- 37% formaldehyde (Sigma Cat# F-8775) or formaldehyde from other sources
- Squirt bottle, manifold dispenser, multichannel pipette reservoir or automated microplate washer
- Graph paper or computer software capable of generating or displaying logarithmic functions
- Absorbent papers or vacuum aspirator
- Test tubes or microfuge tubes capable of storing ≥1 ml
- Poly-L-Lysine (Sigma Cat# P4832 for suspension cells)
- Orbital shaker (optional)
- Deionized or sterile water
*Note: Protocols are specific to each batch/lot. For the correct instructions please follow the protocol included in your kit.
| Step | Procedure |
| 1. | Seed 200 µL of 20,000 adherent cells in culture medium in each well of a 96-well plate. The plates included in the kit are sterile and treated for cell culture. For suspension cells and loosely attached cells, coat the plates with 100 µL of 10 µg/ml Poly-L-Lysine (not included) to each well of a 96-well plate for 30 minutes at 37°C prior to adding cells. |
| 2. | Incubate the cells for overnight at 37°C, 5% CO2. |
| 3. | Treat the cells as desired. |
| 4. | Remove the cell culture medium and rinse with 200 µL of 1x TBS, twice. |
| 5. | Fix the cells by incubating with 100 µL of Fixing Solution for 20 minutes at room temperature. The 4% formaldehyde is used for adherent cells and 8% formaldehyde is used for suspension cells and loosely attached cells. |
| 6. | Remove the Fixing Solution and wash the plate 3 times with 200 µL 1x Wash Buffer for five minutes each time with gentle shaking on the orbital shaker. The plate can be stored at 4°C for a week. |
| 7. | Add 100 µL of Quenching Buffer and incubate for 20 minutes at room temperature. |
| 8. | Wash the plate 3 times with 1x Wash Buffer for 5 minutes each time. |
| 9. | Add 200 µL of Blocking Buffer and incubate for 1 hour at room temperature. |
| 10. | Wash 3 times with 200 µL of 1x Wash Buffer for 5 minutes each time. |
| 11. | Add 50 µL of 1x primary antibodies Anti-IRF-3 (Phospho-Ser396) Antibody, Anti-IRF-3 Antibody and/or Anti-GAPDH Antibody) to the corresponding wells, cover with Parafilm and incubate for 16 hours (overnight) at 4°C. If the target expression is known to be high, incubate for 2 hours at room temperature. |
| 12. | Wash 3 times with 200 µL of 1x Wash Buffer for 5 minutes each time. |
| 13. | Add 50 µL of 1x secondary antibodies (HRP-Conjugated AntiRabbit IgG Antibody or HRP-Conjugated Anti-Mouse IgG Antibody) to corresponding wells and incubate for 1.5 hours at room temperature. |
| 14. | Wash 3 times with 200 µL of 1x Wash Buffer for 5 minutes each time. |
| 15. | Add 50 µL of Ready-to-Use Substrate to each well and incubate for 30 minutes at room temperature in the dark. |
| 16. | Add 50 µL of Stop Solution to each well and read OD at 450 nm immediately using the microplate reader. |
(Additional Crystal Violet staining may be performed if desired – details of this may be found in the kit technical manual.)
