Chimerigen

CD28 (human) (rec.) (His)

CHF 420.00
In stock
CHI-HF-201CD28-C100100 µgCHF 420.00
More Information
Product Details
Synonyms T-cell-specific surface glycoprotein CD28; TP44
Product Type Protein
Properties
Source/Host HEK 293 cells
Sequence

The extracellular domain of human CD28 (aa 19-152) is fused at the C-terminus to a His-tag.

Crossreactivity Human
Purity ≥98% (SDS-PAGE)
Endotoxin Content <0.06EU/μg purified protein (LAL test; Lonza).
Reconstitution Reconstitute at 100μg/ml in sterile PBS.
Formulation Lyophilized from 0.2μm-filtered solution in PBS.
Other Product Data

NCBI reference AAA60581.1: CD28 (human)

Declaration Manufactured by Chimerigen.
Shipping and Handling
Shipping BLUE ICE
Short Term Storage +4°C
Long Term Storage -20°C
Handling Advice Avoid freeze/thaw cycles.
Centrifuge lyophilized vial before opening and reconstitution.
Use/Stability Stable for at least 1 year after receipt when stored at -20°C.
Working aliquots are stable for up to 3 months when stored at -20°C.
Documents
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Product Specification Sheet
Datasheet Download PDF
Description

CD28 and CTLA-4 together with their ligands, CD80 (B7-1) and CD86 (B7-2), constitute one of the dominant costimulatory pathways that regulate T and B cell responses. CD28 and CTLA-4 are structurally homologous molecules that are members of the immunoglobulin (Ig) gene superfamily. Both CD28 and CTLA-4 are composed of a single Ig V-like extracellular domain, a transmembrane domain and an intracellular domain. CD28 and CTLA-4 are both expressed on the cell surface as disulfide-linked homodimers or as monomers. The genes encoding these two molecules are closely linked on human chromosome 2 and mouse chromosome 1. Mouse CD28 is expressed constitutively on virtually 100% of mouse T cells and on developing thymocytes. Cell surface expression of mouse CD28 is downregulated upon ligation of CD28 in the presence of PMA or PHA. In contrast, CTLA-4 is not expressed constitutively but is upregulated rapidly following T cell activation and CD28 ligation. Cell surface expression of mouse CTLA-4 peaks approx.y 48 hours after activation. Although both CTLA-4 and CD28 can bind to the same ligands, CTLA-4 binds to B7-1 and B7-2 with a 20-100 fold higher affinity than CD28. CD28/B7 interaction has been shown to prevent apoptosis of activated T cells via the upregulation of bcl-XL. CD28 ligation has also been shown to regulate Th1/Th2 differentiation.

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