Description
SREBP-1 (Phospho-Ser439)Colorimetric Cell-Based ELISA Kit
The SREBP-1 Phospho-Ser439 Colorimetric Cell-Based ELISA Kit is a powerful tool for detecting and quantifying levels of phosphorylated SREBP-1 in cell lysates. This kit offers exceptional sensitivity and accuracy, allowing for reliable and reproducible results in a variety of research applications.SREBP-1 is a key transcription factor involved in the regulation of lipid metabolism and the synthesis of fatty acids and cholesterol. Phosphorylation of SREBP-1 at Ser439 plays a critical role in modulating its activity and function.
Dysregulation of SREBP-1 phosphorylation has been implicated in various metabolic disorders, making it a valuable target for therapeutic interventions.By utilizing the SREBP-1 Phospho-Ser439 Colorimetric Cell-Based ELISA Kit, researchers can gain valuable insights into the molecular mechanisms underlying lipid metabolism and metabolic diseases. This kit provides a simple and efficient way to study the signaling pathways involving SREBP-1 phosphorylation, paving the way for the development of novel therapeutic strategies.
| Product Name: | SREBP-1 (Phospho-Ser439)Colorimetric Cell-Based ELISA Kit |
| Product Code: | CBCAB01690 |
| ELISA Type: | Cell-Based |
| Target: | SREBP-1 (Phospho-Ser439) |
| Reactivity: | Human, Rat |
| Dynamic Range: | > 5000 Cells |
| Detection Method: | Colorimetric 450 nm |
| Format: | 2 x 96-Well Microplates |
The SREBP-1 (Phospho-Ser439) Colorimetric Cell-Based ELISA Kit is a convenient, lysate-free, high throughput and sensitive assay kit that can detect SREBP-1 protein phosphorylation and expression profile in cells. The kit can be used for measuring the relative amounts of phosphorylated SREBP-1 in cultured cells as well as screening for the effects that various treatments, inhibitors (ie. siRNA or chemicals), or activators have on SREBP-1 phosphorylation.
Qualitative determination of SREBP-1 (Phospho-Ser439) concentration is achieved by an indirect ELISA format. In essence, SREBP-1 (Phospho-Ser439) is captured by SREBP-1 (Phospho-Ser439)-specific primary (1ø) antibodies while the HRP-conjugated secondary (2ø) antibodies bind the Fc region of the 1ø antibody. Through this binding, the HRP enzyme conjugated to the 2ø 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: 6720, UniProt ID: P36956, OMIM: 184756, Unigene: Hs.592123/Hs.655395 |
| Gene Symbol: | SREBF1 |
| Sub Type: | Phospho |
| UniProt Protein Function: | Transcriptional activator required for lipid homeostasis. Regulates transcription of the LDL receptor gene as well as the fatty acid and to a lesser degree the cholesterol synthesis pathway. Binds to the sterol regulatory element 1 (SRE-1) (5'-ATCACCCCAC-3'). Has dual sequence specificity binding to both an E-box motif (5'-ATCACGTGA-3') and to SRE-1 (5'-ATCACCCCAC-3'). |
| NCBI Summary: | This gene encodes a transcription factor that binds to the sterol regulatory element-1 (SRE1), which is a decamer flanking the low density lipoprotein receptor gene and some genes involved in sterol biosynthesis. The protein is synthesized as a precursor that is attached to the nuclear membrane and endoplasmic reticulum. Following cleavage, the mature protein translocates to the nucleus and activates transcription by binding to the SRE1. Sterols inhibit the cleavage of the precursor, and the mature nuclear form is rapidly catabolized, thereby reducing transcription. The protein is a member of the basic helix-loop-helix-leucine zipper (bHLH-Zip) transcription factor family. This gene is located within the Smith-Magenis syndrome region on chromosome 17. [provided by RefSeq, Mar 2016] |
| UniProt Code: | P36956 |
| NCBI GenInfo Identifier: | 166897633 |
| NCBI Gene ID: | 6720 |
| NCBI Accession: | P36956.2 |
| UniProt Secondary Accession: | P36956,Q16062, Q59F52, Q6P4R7, Q6PFW7, Q6PJ36, Q8TAK9 B0I4X3, B0I4X4, D3DXC4, |
| UniProt Related Accession: | P36956 |
| Molecular Weight: | 45,816 Da |
| NCBI Full Name: | Sterol regulatory element-binding protein 1 |
| NCBI Synonym Full Names: | sterol regulatory element binding transcription factor 1 |
| NCBI Official Symbol: | SREBF1 |
| NCBI Official Synonym Symbols: | SREBP1; bHLHd1; SREBP1a; SREBP-1c |
| NCBI Protein Information: | sterol regulatory element-binding protein 1 |
| UniProt Protein Name: | Sterol regulatory element-binding protein 1 |
| UniProt Synonym Protein Names: | Class D basic helix-loop-helix protein 1; bHLHd1 |
| UniProt Gene Name: | SREBF1 |
| UniProt Entry Name: | SRBP1_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-SREBP-1 (Phospho-Ser439) Antibody, Anti-SREBP-1 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.)
