- Other Names
- CD86, B7-2, T lymphocyte activation antigen CD86, Activation B7-2 antigen, CD28 antigen ligand 2, CD28LG2B7-2 antigen, B70, BU63, CTLA-4 counter-receptor B7.2, FUN-1
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CD86, also known as B7-2, is a member of cell surface immunoglobulin superfamily. B7 family members are transmembrane molecules that exist predominantly as monomers. They are classified into three groups according to their functions. Group I members include B7-1, B7-2, and B7-H2. These members are either co-stimulatory or co-inhibitory in modulating T cell response. Group II members include B7-H1 (PD-L1) and B7-DC (PD-L2) which are ligands for PD-1. These members are involved in regulating induction and maintenance of peripheral immune tolerance. Group III members include B7-H3 and B7-H4 whose role in T cell regulation has yet to be defined. CD86 is expressed on activated B and T cells, macrophages, dendritic cells, and astrocytes. CD86, along with CD80, is a ligand of CD28 and CD152 (CTLA-4). CD86 is expressed earlier in the immune response than CD80. CD86 has also been shown to be involved in immunoglobulin class-switching and triggering of NK cell-mediated cytotoxicity. CD86 binds to CD28 to transduce co-stimulatory signals for T cell activation, proliferation, and cytokine production. CD86 can also bind to CD152, also known as CTLA-4, to deliver an inhibitory signal to T cells.Product Details
- Human B7-2/CD86, amino acid Leu26-Pro247 (accession # NP_787058.4) with a C-terminal 6x His tag, was expressed in 293E cells.
- Molecular Mass
- The 228 amino acid recombinant protein has a predicted molecular mass of approximately 26.21 kD. The DTT-reduced and non-reduced protein migrates at approximately 52 kD by SDS-PAGE. The predicted N-terminal amino acid is Leu.
- > 95%, as determined by Coomassie stained SDS-PAGE.
- 0.22 µm filtered protein solution is in 1x PBS.
- Endotoxin Level
- Less than 0.1 EU per µg protein as determined by the LAL method.
- 10 and 25 µg sizes are bottled at 200 µg/mL. 100 µg is lot-specific and bottled at the concentration indicated on the vial (please contact technical support for concentration, or use our Lookup tool if you have a lot number.)
- 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.
- When human B7-2/CD86 is immobilized at 0.5 μg/ml (100 μl/well) using a anti-His antibody (Cat. No. 652501), biotinylated human CTLA-4 binds with EC50 of 10 - 40 ng/ml in a functional ELISA.
- 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 verified 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 firstname.lastname@example.org.
- Immunoglobulin family
Activated antigen presenting cells, including B cells, dendritic cells and macrophages
- B7-2 is a costimulatory molecule that is required for T cell proliferation and IL-2 production.
- Leukocytes, endothelial cells
- CD28, CTLA4
- Measured by the ability of immobilized protein to bind biotinylated human CTLA-4
- Biology Area
- Cell Biology, Immunology, Neuroscience, Neuroscience Cell Markers, Costimulatory Molecules
- Molecular Family
- CD Molecules, Immune Checkpoint Receptors, Soluble Receptors
- Gene ID
- 942 View all products for this Gene ID
- View information about B7-2 on UniProt.org
- 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.
- 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.
- How do you convert activity as an ED50 in ng/ml to a specific activity in Units/mg?
- Use formula Specific activity (Units/mg) = 10e6/ ED50 (ng/mL)
- 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.