Recombinant Human NTB-A/SLAMF6 His tag Protein, CF

Recombinant Human NTB-A/SLAMF6 His tag Protein, CF Summary

Product Specifications

Product Datasheets

Carrier Free

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.

Background: NTB-A/SLAMF6

NTB-A, also known as Ly108 and SLAMF6, is a 60 kDa type I transmembrane glycoprotein in the SLAM subgroup of the CD2 family (1). Mature human NTB-A consists of a 205 amino acid (aa) extracellular domain (ECD) with one Ig-like V-set and one Ig-like C2-set domain, a 21 aa transmembrane segment, and an 84 aa cytoplasmic domain with two immunoreceptor tyrosine-based switch motifs (ITSMs) (2, 3). An alternatively spliced isoform is truncated in the cytoplasmic domain and lacks the two ITSMs. Within the ECD, human NTB-A shares 48% aa sequence identity with mouse and rat NTB-A. The ECD of human NTB-A shares 19%-34% aa sequence identity with comparable regions of human 2B4, BLAME, CD2F-10, CD84, CD229, CRACC, and SLAM. NTB-A is expressed on the surface of NK, T, and B lymphocytes as well as eosinophils (2, 4, 5). It interacts homophilically through weak associations between the Ig-V domains (2, 5-7). NTB-A functions as an activating coreceptor on NK and T cells (2, 5, 6, 8). Tyrosine phosphorylation in the membrane proximal ITSM enables specific association with EAT-2, an interaction that is required for NTB-A mediated cytotoxicity of NK cells (9). Phosphorylation-dependent NTB-A association with SAP is required for full production of IFN-gamma by NK cells (5, 9). This interaction is independent of EAT-2 binding and appears to involve the membrane distal ITSM (5, 9). NTB-A deficient mice show weakened Th2 responses and elevated levels of neutrophil-derived inflammatory mediators (10). In B cells, NTB-A modulates immunoglobulin class switching and the balance between tolerance and autoimmunity (5, 11). In addition, NTB-A binds to the influenza virus hemagglutinin (HA) protein which co-stimulates NK cell activation (12). The Vpu protein encoded by HIV-1 interferes with NTB-A glycosylation and cell surface expression (13).

Related Research Areas

• B Cell Activation
• Co-stimulatory and Co-inhibitory Molecules
• ITIM/ITAM Immunoreceptors and Related Molecules
• Natural Killer T (NKT) Cells