Human CD55 / DAF ELISA Kit (HUFI00689)
- SKU:
- HUFI00689
- Product Type:
- ELISA Kit
- Size:
- 96 Assays
- Uniprot:
- P08174
- Sensitivity:
- 18.75pg/ml
- Range:
- 31.25-2000pg/ml
- ELISA Type:
- Sandwich
- Synonyms:
- CD55, DAF, Complement decay-acceleRating factor, CR, TC, CD55 antigen, decay acceleRating factor for complement
- Reactivity:
- Human
- Research Area:
- Immunology
Description
Human CD55 / DAF ELISA Kit
CD55 / DAF encodes a glycoprotein involved in the regulation of the complement cascade. Binding of CD55 / DAF to complement proteins accelerates their decay, thereby disrupting the cascade and preventing damage to host cells. Diseases associated with CD55 / DAF include Complement Hyperactivation, Angiopathic Thrombosis, and Protein-Losing Enteropathy. The Assay Genie Human CD55 / DAF ELISA is a highly sensitive assay for the quantitative measurement of CD55 / DAF in serum, blood, plasma, cell culture supernatant and tissue samples.
Key Features
| Save Time | Pre-coated 96 well plate | |
| Quick Start | Kit includes all necessary reagents | |
| Publication Ready | Reproducible and reliable results |
Overview
| Product Name: | Human CD55 / DAF ELISA Kit |
| Product Code: | HUFI00689 |
| Size: | 96 Assays |
| Alias: | CD55, DAF, Complement decay-acceleRating factor, CR, TC, CD55 antigen, decay acceleRating factor for complement |
| Detection Method: | Sandwich ELISA, Double Antibody |
| Application: | This immunoassay kit allows for the in vitro quantitative determination of Human CD55 concentrations in serum plasma and other biological fluids. |
| Sensitivity: | 18.75pg/ml |
| Range: | 31.25-2000pg/ml |
| Storage: | 4°C for 6 months |
| Note: | For Research Use Only |
Additional Information
| Recovery: | Matrices listed below were spiked with certain level of Human CD55 and the recovery rates were calculated by comparing the measured value to the expected amount of Human CD55 in samples.
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| Linearity: | The linearity of the kit was assayed by testing samples spiked with appropriate concentration of Human CD55 and their serial dilutions. The results were demonstrated by the percentage of calculated concentration to the expected.
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| CV(%): | Intra-Assay: CV<8% |
Kit Components
| Component | Quantity | Storage |
| ELISA Microplate (Dismountable) | 8x12 strips | 4°C for 6 months |
| Lyophilized Standard | 2 | 4°C/ -20°C |
| Sample/Standard Dlution Buffer | 20ml | 4°C |
| Biotin-labeled Antibody (Concentrated) | 120ul | 4°C (Protection from light) |
| Antibody Dilution Buffer | 10ml | 4°C |
| HRP-Streptavidin Conjugate (SABC) | 120ul | 4°C (Protect from light) |
| SABC Dilution Buffer | 10ml | 4°C |
| TMB Substrate | 10ml | 4°C (Protection from light) |
| Stop Solution | 10ml | 4°C |
| Wash Buffer (25X) | 30ml | 4°C |
| Plate Sealer | 5 | - |
Other materials required:
- Microplate reader with 450 nm wavelength filter
- Multichannel Pipette, Pipette, microcentrifuge tubes and disposable pipette tips
- Incubator
- Deionized or distilled water
- Absorbent paper
- Buffer resevoir
Protein Information
| Uniprot: | |
| UniProt Protein Function: | CD55: This protein recognizes C4b and C3b fragments that condense with cell-surface hydroxyl or amino groups when nascent C4b and C3b are locally generated during C4 and c3 activation. Interaction of daf with cell-associated C4b and C3b polypeptides interferes with their ability to catalyze the conversion of C2 and factor B to enzymatically active C2a and Bb and thereby prevents the formation of C4b2a and C3bBb, the amplification convertases of the complement cascade. Belongs to the receptors of complement activation (RCA) family. 2 isoforms of the human protein are produced by alternative splicing. |
| UniProt Code: | |
| NCBI GenInfo Identifier: | |
| NCBI Gene ID: | |
| NCBI Accession: | |
| UniProt Related Accession: | |
| Molecular Weight: | 41,400 Da |
Protocol
*Note: Protocols are specific to each batch/lot. For the exact instructions please follow the protocol included in your kit.
Before adding to wells, equilibrate the SABC working solution and TMB substrate for at least 30 min at 37°C. When diluting samples and reagents, they must be mixed completely and evenly. It is recommended to plot a standard curve for each test.
| Step | Procedure |
| 1. | Set standard, test sample and control (zero) wells on the pre-coated plate respectively, and then, record their positions. It is recommended to measure each standard and sample in duplicate. Wash plate 2 times before adding standard, sample and control (zero) wells! |
| 2. | Aliquot 0.1ml standard solutions into the standard wells. |
| 3. | Add 0.1 ml of Sample / Standard dilution buffer into the control (zero) well. |
| 4. | Add 0.1 ml of properly diluted sample ( Human serum, plasma, tissue homogenates and other biological fluids.) into test sample wells. |
| 5. | Seal the plate with a cover and incubate at 37 °C for 90 min. |
| 6. | Remove the cover and discard the plate content, clap the plate on the absorbent filter papers or other absorbent material. Do NOT let the wells completely dry at any time. Wash plate X2. |
| 7. | Add 0.1 ml of Biotin- detection antibody working solution into the above wells (standard, test sample & zero wells). Add the solution at the bottom of each well without touching the side wall. |
| 8. | Seal the plate with a cover and incubate at 37°C for 60 min. |
| 9. | Remove the cover, and wash plate 3 times with Wash buffer. Let wash buffer rest in wells for 1 min between each wash. |
| 10. | Add 0.1 ml of SABC working solution into each well, cover the plate and incubate at 37°C for 30 min. |
| 11. | Remove the cover and wash plate 5 times with Wash buffer, and each time let the wash buffer stay in the wells for 1-2 min. |
| 12. | Add 90 µl of TMB substrate into each well, cover the plate and incubate at 37°C in dark within 10-20 min. (Note: This incubation time is for reference use only, the optimal time should be determined by end user.) And the shades of blue can be seen in the first 3-4 wells (with most concentrated standard solutions), the other wells show no obvious color. |
| 13. | Add 50 µl of Stop solution into each well and mix thoroughly. The color changes into yellow immediately. |
| 14. | Read the O.D. absorbance at 450 nm in a microplate reader immediately after adding the stop solution. |
Sample Type
When carrying out an ELISA assay it is important to prepare your samples in order to achieve the best possible results. Below we have a list of procedures for the preparation of samples for different sample types.
| Sample Type | Protocol |
| Serum | If using serum separator tubes, allow samples to clot for 30 minutes at room temperature. Centrifuge for 10 minutes at 1,000x g. Collect the serum fraction and assay promptly or aliquot and store the samples at -80°C. Avoid multiple freeze-thaw cycles. If serum separator tubes are not being used, allow samples to clot overnight at 2-8°C. Centrifuge for 10 minutes at 1,000x g. Remove serum and assay promptly or aliquot and store the samples at -80°C. Avoid multiple freeze-thaw cycles. |
| Plasma | Collect plasma using EDTA or heparin as an anticoagulant. Centrifuge samples at 4°C for 15 mins at 1000 × g within 30 mins of collection. Collect the plasma fraction and assay promptly or aliquot and store the samples at -80°C. Avoid multiple freeze-thaw cycles. Note: Over haemolysed samples are not suitable for use with this kit. |
| Urine & Cerebrospinal Fluid | Collect the urine (mid-stream) in a sterile container, centrifuge for 20 mins at 2000-3000 rpm. Remove supernatant and assay immediately. If any precipitation is detected, repeat the centrifugation step. A similar protocol can be used for cerebrospinal fluid. |
| Cell culture supernatant | Collect the cell culture media by pipette, followed by centrifugation at 4°C for 20 mins at 1500 rpm. Collect the clear supernatant and assay immediately. |
| Cell lysates | Solubilize cells in lysis buffer and allow to sit on ice for 30 minutes. Centrifuge tubes at 14,000 x g for 5 minutes to remove insoluble material. Aliquot the supernatant into a new tube and discard the remaining whole cell extract. Quantify total protein concentration using a total protein assay. Assay immediately or aliquot and store at ≤ -20 °C. |
| Tissue homogenates | The preparation of tissue homogenates will vary depending upon tissue type. Rinse tissue with 1X PBS to remove excess blood & homogenize in 20ml of 1X PBS (including protease inhibitors) and store overnight at ≤ -20°C. Two freeze-thaw cycles are required to break the cell membranes. To further disrupt the cell membranes you can sonicate the samples. Centrifuge homogenates for 5 mins at 5000xg. Remove the supernatant and assay immediately or aliquot and store at -20°C or -80°C. |
| Tissue lysates | Rinse tissue with PBS, cut into 1-2 mm pieces, and homogenize with a tissue homogenizer in PBS. Add an equal volume of RIPA buffer containing protease inhibitors and lyse tissues at room temperature for 30 minutes with gentle agitation. Centrifuge to remove debris. Quantify total protein concentration using a total protein assay. Assay immediately or aliquot and store at ≤ -20 °C |
| Breast Milk | Collect milk samples and centrifuge at 10,000 x g for 60 min at 4°C. Aliquot the supernatant and assay. For long term use, store samples at -80°C. Minimize freeze/thaw cycles. |
CD55 / DAF Background
CD55, also known as Decay-Accelerating Factor (DAF), is a protein that plays an important role in the regulation of the complement system. The complement system is a part of the immune system that helps to defend the body against infections. It consists of a complex network of proteins that work together to identify and eliminate foreign substances, such as bacteria and viruses.
CD55 Structure and Distribution
CD55/DAF is a glycoprotein expressed on various cell types in the body, including red blood cells, white blood cells, and endothelial cells lining blood vessels. Structurally, CD55/DAF possesses several functional domains that allow it to interact with complement proteins and regulate their activity.
CD55/DAF in the Complement System
The primary function of CD55/DAF is to act as a decay-accelerating factor within the complement system. CD55/DAF acts as a decay-accelerating factor by binding to complement proteins, such as C3b and C4b, on cell surfaces. It prevents the further activation of the complement cascade and the formation of the membrane attack complex (MAC), which can cause cell damage. CD55/DAF helps maintain the balance between complement activation and protection of host cells, ensuring effective immune response without excessive self-damage.
CD55 / DAF FAQs
What is the CD55 / DAF ELISA Kit?
The Human CD55 / DAF ELISA Kit is a specialized research tool designed to measure the levels of CD55 protein in human samples.
What are the advantages of using the CD55 / DAF ELISA Kit?
The Human CD55 / DAF ELISA Kit offers several advantages for researchers. It provides a reliable and quantitative measurement of CD55 protein levels, enabling detailed investigations into its role in complement system regulation and associated research areas.
Where can I find more information about the CD55 / DAF ELISA Kit?
For more detailed information about the CD55 / DAF ELISA Kit, including technical specifications, performance characteristics, and ordering details, please refer to the product brochure or contact our customer support team. We are here to assist you with any inquiries you may have.
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