Epigenetics and Nuclear Signaling
CDK8 Colorimetric Cell-Based ELISA Kit
- SKU:
- CBCAB00578
- Product Type:
- ELISA Kit
- ELISA Type:
- Cell Based
- Research Area:
- Epigenetics and Nuclear Signaling
- Reactivity:
- Human
- Reactivity:
- Mouse
- Detection Method:
- Colorimetric
Description
| Product Name: | CDK8 Colorimetric Cell-Based ELISA |
| Product Code: | CBCAB00578 |
| ELISA Type: | Cell-Based |
| Target: | CDK8 |
| Reactivity: | Human, Mouse |
| Dynamic Range: | > 5000 Cells |
| Detection Method: | Colorimetric 450 nmStorage/Stability:4°C/6 Months |
| Format: | 96-Well Microplate |
The CDK8 Colorimetric Cell-Based ELISA Kit is a convenient, lysate-free, high throughput and sensitive assay kit that can detect CDK8 protein expression profile in cells. The kit can be used for measuring the relative amounts of CDK8 in cultured cells as well as screening for the effects that various treatments, inhibitors (ie siRNA or chemicals), or activators have on CDK8.
Qualitative determination of CDK8 concentration is achieved by an indirect ELISA format. In essence, CDK8 is captured by CDK8-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: 1024, UniProt ID: P49336, OMIM: 603184, Unigene: Hs.382306 |
| Gene Symbol: | CDK8 |
| Sub Type: | None |
| UniProt Protein Function: | CDK8: a protein kinase of the CDK family. Along with cyclin C forms part of the RNA polymerase II holoenzyme complex. Phosphorylates the carboxy-terminal domain (CTD) of the largest subunit of RNA polymerase II. Regulates transcription by targeting the CDK7/cyclin H subunits of the general transcription initiation factor IIH (TFIIH), thus providing a link between the 'Mediator-like' protein complexes and the basal transcription machinery. |
| UniProt Protein Details: | Protein type:EC 2.7.11.23; Cell cycle regulation; EC 2.7.11.22; Protein kinase, CMGC; Kinase, protein; Protein kinase, Ser/Thr (non-receptor); CMGC group; CDK family; CDK8 subfamily Chromosomal Location of Human Ortholog: 13q12 Cellular Component: nucleoplasm; Srb-mediator complex; nucleus Molecular Function:RNA polymerase subunit kinase activity; protein binding; cyclin-dependent protein kinase activity; ATP binding; protein kinase activity Biological Process: transcription initiation from RNA polymerase II promoter; Notch signaling pathway; transcription, DNA-dependent; regulation of cell cycle; transforming growth factor beta receptor signaling pathway; positive regulation of transcription from RNA polymerase II promoter; gene expression; protein amino acid phosphorylation |
| NCBI Summary: | The protein encoded by this gene is a member of the cyclin-dependent protein kinase (CDK) family. CDK family members are highly similar to the gene products of Saccharomyces cerevisiae cdc28, and Schizosaccharomyces pombe cdc2, and are known to be important regulators of cell cycle progression. This kinase and its regulatory subunit cyclin C are components of the RNA polymerase II holoenzyme complex, which phosphorylates the carboxy-terminal domain (CTD) of the largest subunit of RNA polymerase II. This kinase has also been shown to regulate transcription by targeting the CDK7/cyclin H subunits of the general transcription initiation factor IIH (TFIIH), thus providing a link between the 'Mediator-like' protein complexes and the basal transcription machinery. [provided by RefSeq, Jul 2008] |
| UniProt Code: | P49336 |
| NCBI GenInfo Identifier: | 1345718 |
| NCBI Gene ID: | 1024 |
| NCBI Accession: | P49336.1 |
| UniProt Secondary Accession: | P49336,Q5VUF3, Q6ISB5, |
| UniProt Related Accession: | P49336 |
| Molecular Weight: | 464 |
| NCBI Full Name: | Cyclin-dependent kinase 8 |
| NCBI Synonym Full Names: | cyclin-dependent kinase 8 |
| NCBI Official Symbol: | CDK8 |
| NCBI Official Synonym Symbols: | K35 |
| NCBI Protein Information: | cyclin-dependent kinase 8; protein kinase K35; CDK8 protein kinase; mediator complex subunit CDK8; cell division protein kinase 8; mediator of RNA polymerase II transcription subunit CDK8 |
| UniProt Protein Name: | Cyclin-dependent kinase 8 |
| UniProt Synonym Protein Names: | Cell division protein kinase 8; Mediator complex subunit CDK8; Mediator of RNA polymerase II transcription subunit CDK8; Protein kinase K35 |
| Protein Family: | Cyclin-dependent kinase |
| UniProt Gene Name: | CDK8 |
| UniProt Entry Name: | CDK8_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-CDK8 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.)
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