Key Product Details
Structure / Form
(Glu31 - Asn239)
Accession # Q9ET39
(Glu98 - Lys330)
N-terminal Sequence Analysis
Predicted Molecular Mass
Formulation, Preparation and Storage
|Formulation||Lyophilized from a 0.2 μm filtered solution in PBS.|
Reconstitute at 100 μg/mL in sterile 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.
NTB-A, also known as Ly108 and SLAMF6, is a 60 kDa type I transmembrane glycoprotein that belongs to the SLAM subgroup of the CD2 family (1). Mature mouse NTB-A consists of a 209 amino acid (aa) ECD with one Ig-like V-type and one Ig-like C2-type domain, a 23 aa transmembrane segment, and an 89 aa cytoplasmic domain with two immunoreceptor tyrosine-based switch motifs ITSMs (2). Within the ECD, mouse NTB-A shares 48% and 70% aa sequence identity with human and rat NTB-A, respectively. The ECD of mouse NTB-A shares 20% - 34% aa sequence identity with comparable regions of mouse 2B4, BLAME, CD2F-10, CD84, CD229, CRACC, and SLAM. An alternatively spliced isoform diverges after the second ITSM (2). NTB-A is expressed on the surface of NK, T, and B lymphocytes as well as eosinophils (3 - 5). It interacts homophilically through weak associations between the Ig-V type domains (5 - 7). NTB-A functions as an activating coreceptor on NK and T cells (3, 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 NK cell IFN-gamma (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). On B cells, NTB-A modulates immunoglobulin class switching and the balance between tolerance and autoimmunity (5, 11). The isoform with the divergent C-terminal tail is overexpressed in B cells from lupus-prone mice (11).
- Veillette, A. (2006) Immunol. Rev. 214:22.
- Peck, S.R. and H.E. Ruley (2000) Immunogenetics 52:63.
- Bottino, C. et al. (2001) J. Exp. Med. 194:235.
- Munitz, A. et al. (2005) J. Immunol. 174:110.
- Valdez, P.A. et al. (2004) J. Biol. Chem. 279:18662.
- Flaig, R.M. et al. (2004) J. Immunol. 172:6524.
- Cao, E. et al. (2006) Immunity 25:559.
- Stark, S. and C. Watzl (2006) Int. Immunol. 18:241.
- Eissmann, P. and C. Watzl (2006) J. Immunol. 177:3170.
- Howie, D. et al. (2005) J. Immunol. 174:5931.
- Kumar, K.R. et al. (2006) Science 312:1665.
Entrez Gene IDs
Product Specific Notices for Recombinant Mouse NTB-A/SLAMF6 Fc Chimera Protein, CF
For research use only