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| Product Name | Human CTLA4 / CD152 Protein (Recombinant) |
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| Description | Purity >98% by SDS-PAGE gel and HPLC analyses., MW: 78.7 kDa or 45-50 kDa or 80-90 kDa. CTLA-4 and CD28 are receptors of the immunoglobulin superfamily that are expressed, along with the transmembrane glycoproteins B7-1 and B7-2, by antigen-presenting cells, and with these ligands constitute crucial co-stimulatory pathways for T and B cell regulatory responses. It is through engagement with CD28 and CTLA-4 that the B7 family ligands B7-1 and B7-2 play principal roles in immunity by activating immune response and maintaining immune tolerance. Co-stimulatory signals generated by B7-1 and B7-2 interactions with CD28 serve to stimulate T cell activation and prevent anergy through the amplification of T cell receptor (TCR) signaling. In contrast, interactions of the ligands with CTLA-4 serves to maintain T cell homeostasis and self-tolerance through the disruption of stimulatory signaling from B7 isoform-bound CD28 complexes, and by inducing powerful inhibitory signals in T cells. CTLA-4, like B7-1, is only poorly expressed on resting dendritic cells; therefore, up-regulation of their interaction and resultant amplification and regulation of T cell activity at peripheral inflammation sites is considerably delayed upon immune activation. Conversely, B7-2 and CD28 are constitutively expressed by resting hematopoietic and T cells, respectively, and as a result are able to rapidly induce up-regulation upon immune activation, making them critical to the early co-stimulatory signaling of immune response. Unlike B7-1 and B7-2, the ligands PD-L1 (or B7-H1) and B7-H2, which also belong to the B7 family, have not been shown to influence immunity through interaction with CTLA-4. B7-H2 has been shown to have restricted interaction with CD28. The difference in expression of B7-1, B7-2 and B7-H2 may enable temporally and spatially-specific regulation of T cell response through non-competitive CD28 interaction. PeproTech's CHO cell-derived Recombinant Human CTLA-4 Fc is a glycosylated, disulfide-linked homodimer of 714 amino acid residues whose monomer consists of the 124-amino-acid length extracellular portion of CTLA-4 fused to the 231-amino-acid length Fc portion of human IgG1 by two glycines. The calculated molecular weight of Recombinant Human CTLA-4 Fc dimer is 78.7 kDa; however, due to glycosylation, the monomer and dimer migrate at apparent molecular weights of approximately 45-50 kDa and 80-90 kDa by SDS-PAGE analysis under reducing conditions. |
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| Size | n/a |
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| Concentration | n/a |
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| Applications | n/a |
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| Other Names | CTLA4, CD152, CELIAC3, CD152 antigen, CTLA-4, Celiac disease 3, IDDM12, GRD4, GSE, CD152 isoform |
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| Gene, Accession, CAS # | CTLA4, Gene ID: 1493 |
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| Catalog # | LS-G133812 |
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| Order / More Info | Human CTLA4 / CD152 Protein (Recombinant) from LIFESPAN BIOSCIENCES INC. |
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| Product Specific References | n/a |
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