Recombinant Rat PD-L1/B7-H1 Fc Chimera Protein, CF Summary
Accession # NP_001178883
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 with Trehalose.|
|Reconstitution||Reconstitute at 500 μg/mL in PBS.|
|Shipping||The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below.|
|Stability & Storage:||
When Recombinant Rat PD-1 Fc Chimera (Catalog # 9814-PD) is coated at 1 µg/mL, Recombinant Rat PD-L1/B7-H1 Fc Chimera (Catalog # 9835-B7) binds with an ED50 of 0.09-0.54 µg/mL.
B7-H1, also known as PD-L1 and CD274, is an approximately 52 kDa transmembrane glycoprotein in the B7 family of immune-regulatory molecules (1). Mature rat B7-H1 consists of a 220 amino acid (aa) extracellular domain (ECD) with two Ig-like domains, a 21 aa transmembrane segment, and a 30 aa cytoplasmic domain (2). Within the ECD, rat B7-H1 shares 74% and 86% aa sequence identity with human and mouse, respectively. B7-H1 is expressed on inflammatory-activated immune cells including macrophages, T cells, and B cells (3-6), keratinocytes (7, 8), enothelial and intestinal epithelial cells (8-10), as well as a variety of carcinomas and melanoma (10, 11). B7-H1 binds to T cell B7-1/CD80 and PD-1 (6, 7, 11-14). It suppresses T cell activation and proliferation (4, 7, 13, 15) and induces the apoptosis of activated T cells (10). It plays a role in the development of immune tolerance by promoting T cell anergy (6, 13) and enhancing regulatory T cell development (15). B7-H1 favors the development of anti-inflammatory IL-10 and IL-22 producing dendritic cells (4, 9) and inhibits the development of Th17 cells (15). In cancer, B7-H1 provides resistance to T cell mediated lysis, enhances EMT, and enhances the tumorigenic function of Th22 cells (5, 8, 11, 14).
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