| Field | Specification |
|---|---|
| Target | |
| Alternative names | T-cell-specific surface glycoprotein CD28; TP44; CD antigen CD28; CD28 |
| UniProt # | |
| Host | |
| Clonality | |
| Isotype | |
| Reactivity | |
| Applications | |
| Immunogen | E.coli-derived human CD28 recombinant protein (Position: Q15-D214). |
| Molecular weight | |
| Purification | |
| Reconstitution | |
| Cellular localization | |
| Concentration | |
| Form | Lyophilized |
| Storage | |
| Catalog no. (Mfr.) | |
| Main SKU |
Product Overview
This rabbit polyclonal antibody recognizes T-cell-specific surface glycoprotein CD28 in human samples and is validated for Western blot, flow cytometry and ELISA. The predicted molecular weight is 25.1 kDa, and the supplier reports an observed band at about 60 kDa.
CD28 is the main co-stimulatory receptor on T cells. When it binds CD80 or CD86 on antigen-presenting cells, it amplifies T-cell receptor signals to promote IL-2 production, proliferation and survival, and it is a core molecule in T-cell activation studies and CAR design.
| Target | T-cell-specific surface glycoprotein CD28 (gene CD28; UniProt P10747, human) |
|---|---|
| Host / Clonality / Isotype | Rabbit / Polyclonal / Rabbit IgG |
| Reactivity | Human |
| Form | Lyophilized |
| Formulation | Per vial: 4 mg trehalose; 0.9 mg NaCl; 0.2 mg Na2HPO4 |
| Calculated MW | 25.1 kDa |
| Observed MW | 60 kDa |
| Storage | As supplied: −20 °C for up to 12 months from receipt. After reconstitution: 4 °C for up to 1 month, or aliquot and keep at −20 °C for up to 6 months. Avoid repeated freeze–thaw cycles. |
Validated Applications
| Western blot | 0.25–0.5 µg/mL (Human) |
|---|---|
| Flow cytometry (fixed cells) | 1–3 µg/1×106 cells (Human) |
| ELISA | 0.1–0.5 µg/mL |
Samples with a confirmed band (WB): human Jurkat cells, human HUT-78 cells.
Recommended loading (WB): 20–40 µg of total protein per lane.
Conditions in the example images (WB): 5–20% gradient SDS-PAGE under reducing conditions, 30 µg lysate per lane, transfer to nitrocellulose membrane, blocking in 5% non-fat milk, primary antibody at 0.5 µg/mL overnight at 4 °C, HRP-conjugated secondary antibody at 1:5000, ECL detection.
Samples with a confirmed signal (flow cytometry): HEL cells.
Immunogen
Recombinant human CD28 fragment (Gln15–Asp214), expressed in E. coli.
Reactivity Notes
The supplier lists reactivity with human. UniProt places T-cell-specific surface glycoprotein CD28 in the cell membrane and SUBCELLULAR LOCATION:. Tissue expression noted by UniProt (human): Expressed in T-cells and plasma cells, but not in less mature B-cells. The samples tested by the supplier (listed above) are a practical starting point for positive controls.
Safety
Customization & Add-ons: Can’t find the antibody you need—or require a custom format for your assay? We can help you source the best match or support custom antibody solutions for diverse research needs, including species and isotype selection, conjugations and labeling (e.g., HRP/AP, biotin, fluorophores), purification grade options (Protein A/G, affinity purified), formulation preferences (buffer selection, carrier-free, glycerol-free), custom concentrations and aliquoting, low-endotoxin options for cell-based work, and application-focused QC/validation support (project dependent). Click Talk to a Scientist to submit a request, email us at support@biohippo.com, or explore our Research Services for additional support—our team will follow up with feasibility details and next steps.
