Recombinant Human CTLA-4 Fc Chimera (CHO-expressed), CF Summary
Accession # P16410
CF stands for Carrier Free (CF). We typically add Bovine Serum Albumin (BSA) as a carrier protein to our recombinant proteins. Adding a carrier protein enhances protein stability, increases shelf-life, and allows the recombinant protein to be stored at a more dilute concentration. The carrier free version does not contain BSA.
In general, we advise purchasing the recombinant protein with BSA for use in cell or tissue culture, or as an ELISA standard. In contrast, the carrier free protein is recommended for applications, in which the presence of BSA could interfere.
|Formulation||Lyophilized from a 0.2 μm filtered solution in PBS.|
|Reconstitution||Reconstitute at 100 μg/mL in PBS.|
|Shipping||The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below.|
|Stability & Storage:||Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
CTLA-4 (cytotoxic T-lymphocyte associated protein‑4, designated CD152), is a type I transmembrane T cell inhibitory molecule that is a member of the Ig superfamily (1, 2). Human or mouse CTLA-4 cDNA encodes 223 amino acids (aa) including a 35 aa signal sequence, a 126 aa extracellular domain (ECD) with one Ig-like V-type domain, a 21 aa transmembrane (TM) sequence, and a 41 aa cytoplasmic sequence. It is found as a covalent homodimer of 41-43 kDa (2) Within the ECD, human CTLA-4 shares 68%, 71% and 83‑86% aa sequence identity with mouse, rat and porcine/bovine/rabbit/feline/canine CTLA-4, respectively. A 174 aa form that lacks TM and cytoplasmic sequences (sCTLA-4) is possibly secreted (3-5). Isoforms of 56-79 aa that mainly contain parts of the cytoplasmic domain are reported. In mouse, an isoform lacking the Ig-like domain has ligand-independent inhibitory activity and is termed liCTLA-4 (6). CD28, which is structurally related to CTLA-4, is constitutively expressed on naïve T cells and promotes T cell activation when engaged by B7-2 on antigen-presenting cells (APC) within the immunological synapse (IS) (1, 7, 8). In contrast, CTLA-4 is recruited from intracellular vesicles to the IS beginning 1-2 days after T cell activation (2, 7, 8). It forms a linear lattice with B7-1 on APC, inducing negative regulatory signals and ending T cell activation (9). Abatacept, a therapeutic human CTLA-4-Ig fusion protein (trade name Orencia), competes with CD28 for B7-1 and B7-2 binding and has been used to antagonize T cell activation in autoimmune conditions and to enhance transplant survival (10). Mice deleted for CTLA-4 show no abnormalities until after birth, but then develop lethal autoimmune reactions due to continued T cell activation and poor control by regulatory T cells, which constitutively express CTLA-4 in wild-type mice and humans (11-13).
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- Vijayakrishnan, L. et al. (2004) Immunity 20:563.
- Pentcheva-Hoang, T. et al. (2004) Immunity 21:401.
- Jansson, A. et al. (2005) J. Immunol 175:1575.
- Darlington, P.J. et al. (2005) J. Immunol. 175:996.
- Platt, A.M. et al. (2010) J. Immunol. 185:1558.
- Wing, K. et al. (2008) Science 322:271.
- Friedline, R.H. et al. (2009) J. Exp. Med. 206:421.
- Jain, N. et al. (2010) Proc. Natl. Acad. Sci. USA 107:1524.
Citations for Recombinant Human CTLA-4 Fc Chimera (CHO-expressed), CF
R&D Systems personnel manually curate a database that contains references using R&D Systems products. The data collected includes not only links to publications in PubMed, but also provides information about sample types, species, and experimental conditions.
Citations: Showing 1 - 2
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ICOS agonism by JTX-2011 (vopratelimab) requires initial T cell priming and Fc cross-linking for optimal T cell activation and anti-tumor immunity in preclinical models
Authors: A Hanson, K Elpek, E Duong, L Shallberg, M Fan, C Johnson, M Wallace, GR Mabry, S Sazinsky, L Pepper, CJ Shu, S Sathyanara, S Zuerndorfe, T Simpson, M Gostissa, M Briskin, D Law, J Michaelson, CJ Harvey
PLoS ONE, 2020;15(9):e0239595.
Sample Types: Whole Cells
Structural basis for cancer immunotherapy by the first-in-class checkpoint inhibitor ipilimumab
Authors: UA Ramagopal, W Liu, SC Garrett-Th, JB Bonanno, Q Yan, M Srinivasan, SC Wong, A Bell, S Mankikar, VS Rangan, S Deshpande, AJ Korman, SC Almo
Proc. Natl. Acad. Sci. U.S.A., 2017;0(0):.
Sample Types: Protein
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Reviews for Recombinant Human CTLA-4 Fc Chimera (CHO-expressed), CF
Average Rating: 4.7 (Based on 3 Reviews)
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Reason for Rating: Worked as expected. Shipping was on-time and we would order this again.