- Regulatory Status
- RUO
- Other Names
- CD4, CD4 antigen (p55), CD4 antigen, CD4 molecule, CD4 receptor,T-cell surface antigen T4/Leu-3, T-cell surface glycoprotein CD4
- Ave. Rating
- Submit a Review
- Product Citations
- publications
Cat # | Size | Price | Quantity Check Availability | Save | ||
---|---|---|---|---|---|---|
569604 | 25 µg | 164€ | ||||
569606 | 100 µg | 332€ |
Cluster of differentiation 4 (CD4), also known as T4 and L3T4, is a member of the immunoglobulin superfamily and single-chain type I transmembrane glycoprotein that plays a crucial role in the immune system including T-cell activation, HIV infection, and other immune-related processes. CD4 is a commonly used marker for the identification of T cell populations. CD4 is found on the surface of immune cells such as monocytes, thymocytes, neutrophils, a subset of mature T lymphocytes, NK cells, macrophages, dendritic cells and neurons. CD4+ T helper cells are an essential part of the human immune system and send signals to other types of immune cells including CD8 killer cells. CD4 acts as a primary receptor for HIV, binding to HIV gp120. CD4 has also been shown to interact with IL-16. CD4 also acts as a co-receptor for the T-cell receptor (TCR) and is involved in the recognition of antigens presented by antigen-presenting cells. CD4 binds directly to MHC class II molecules on the surface of antigen presenting cells.
Product DetailsProduct Details
- Source
- Recombinant human CD4, amino acid Lys26-Trp390 (Accession No. P01730) was expressed in CHO cells. The C-terminal includes 6His.
- Molecular Mass
- The 396 amino acid recombinant protein has a predicted molecular mass of approximately 44.23 kD. The DTT-reduced and non-reduced proteins migrates at approximately 40-55 kD by SDS-PAGE. The N-terminal amino acid is Lys.
- Purity
- > 95%, as determined by Coomassie stained SDS-PAGE.
- Formulation
- 0.22 µm filtered protein solution is in PBS, 2 mM CHAPS, and pH 7.2
- Endotoxin Level
- Less than 0.1 EU per µg protein as determined by the LAL method.
- Concentration
- 25 µg size is bottled at 200 µg/mL. 100 µg size and larger sizes are lot-specific and bottled at the concentration indicated on the vial. To obtain lot-specific concentration and expiration, please enter the lot number in our Certificate of Analysis online tool.
- Storage & Handling
- Unopened vial can be stored between 2°C and 8°C for up to 2 weeks, at -20°C for up to six months, or at -70°C or colder until the expiration date. For maximum results, quick spin vial prior to opening. The protein can be aliquoted and stored at -20°C or colder. Stock solutions can also be prepared at 50 - 100 µg/mL in appropriate sterile buffer, carrier protein such as 0.2 - 1% BSA or HSA can be added when preparing the stock solution. Aliquots can be stored between 2°C and 8°C for up to one week and stored at -20°C or colder for up to 3 months. Avoid repeated freeze/thaw cycles.
- Activity
- Immobilized human CD4 at 2 µg/mL binds to recombinant human biotinylated HIV-1 [HIV-1/Clade B/C (CN54)] GP120 Protein in a dose-dependent manner. The ED50 for this effect is 27 – 162 ng/mL
- Application
-
Bioassay
- Application Notes
-
BioLegend carrier-free recombinant proteins provided in liquid format are shipped on blue-ice. Our comparison testing data indicates that when handled and stored as recommended, the liquid format has equal or better stability and shelf-life compared to commercially available lyophilized proteins after reconstitution. Our liquid proteins are validated in-house to maintain activity after shipping on blue ice and are backed by our 100% satisfaction guarantee. If you have any concerns, contact us at tech@biolegend.com.
Antigen Details
- Structure
- Monomer
- Distribution
-
Majority of thymocytes, T cell subset, macrophages, neutrophils, monocytes, NK cells, and neurons
- Function
- TCR co-receptor, T cell activation
- Interaction
- Dendritic cells, T cells, Thymocytes, Tregs
- Ligand/Receptor
- MHC class II molecule
- Bioactivity
- Measured by its ability to bind human biotinylated HIV-1 [HIV-1/Clade B/C (CN54)] GP120 protein
- Cell Type
- Monocytes, NKT cells, T cells
- Biology Area
- Immunology, Innate Immunity
- Molecular Family
- CD Molecules
- Antigen References
-
- Maddon PJ, et al. 1985. Cell. 42:93-104.
- Kitchen SG, et al. 2005. Proc Natl Acad Sci. 102:3794-9.
- Huppa JB, et al. 2010. Nature. 463:963.
- Agrez M, et al. 2023. Sci Rep. 13:19741.
- Klatzmann D, et al. 1984. Nature. 312:767-8.
- Kim PW, et al. 2023. Science. 301:1725.
- Bofill M, et al. 1992. Clinical and Experimental Immunology. 88:243-52.
- Gene ID
- 920 View all products for this Gene ID
- UniProt
- View information about CD4 on UniProt.org
Related FAQs
- Why choose BioLegend recombinant proteins?
-
• Each lot of product is quality-tested for bioactivity as indicated on the data sheet.
• Greater than 95% Purity or higher, tested on every lot of product.
• 100% Satisfaction Guarantee for quality performance, stability, and consistency.
• Ready-to-use liquid format saves time and reduces challenges associated with reconstitution.
• Bulk and customization available. Contact us.
• Learn more about our Recombinant Proteins. - How does the activity of your recombinant proteins compare to competitors?
-
We quality control each and every lot of recombinant protein. Not only do we check its bioactivity, but we also compare it against other commercially available recombinant proteins. We make sure each recombinant protein’s activity is at least as good as or better than the competition’s. In order to provide you with the best possible product, we ensure that our testing process is rigorous and thorough. If you’re curious and eager to make the switch to BioLegend recombinants, contact your sales representative today!
- What is the specific activity or ED50 of my recombinant protein?
-
The specific activity range of the protein is indicated on the product datasheets. Because the exact activity values on a per unit basis can largely fluctuate depending on a number of factors, including the nature of the assay, cell density, age of cells/passage number, culture media used, and end user technique, the specific activity is best defined as a range and we guarantee the specific activity of all our lots will be within the range indicated on the datasheet. Please note this only applies to recombinants labeled for use in bioassays. ELISA standard recombinant proteins are not recommended for bioassay usage as they are not tested for these applications.
- Have your recombinants been tested for stability?
-
Our testing shows that the recombinant proteins are able to withstand room temperature for a week without losing activity. In addition the recombinant proteins were also found to withstand four cycles of freeze and thaw without losing activity.
- Does specific activity of a recombinant protein vary between lots?
-
Specific activity will vary for each lot and for the type of experiment that is done to validate it, but all passed lots will have activity within the established ED50 range for the product and we guarantee that our products will have lot-to-lot consistency. Please conduct an experiment-specific validation to find the optimal ED50 for your system.
- How do you convert activity as an ED50 in ng/ml to a specific activity in Units/mg?
-
Use formula Specific activity (Units/mg) = 10^6/ ED50 (ng/mL)
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