Recombinant Human BTLA (31-134) Protein, Fc Tag, 1mg

Background
B- and T-lymphocyte attenuator (BTLA) is also known as B- and T-lymphocyte-associated protein, CD antigen CD272. BTLA contains one Ig-like V-type (immunoglobulin-like) domain. As a lymphocyte inhibitory receptor, BTLA / CD272 inhibits lymphocytes during immune response. BTLA / CD272 can interact with tyrosine phosphatases PTPN6/SHP-1 and PTPN11/SHP-2, and interact with TNFRSF14/HVEM.

Source
Recombinant Human BTLA, Fc Tag (BTA-H5255) is expressed from human 293 cells (HEK293). It contains AA Lys 31 - Thr 134 (Accession # NP_001078826.1).
Predicted N-terminus: Lys 31

Molecular Characterization
This protein carries a human IgG1 Fc tag at the C-terminus.
The protein has a calculated MW of 38.7 kDa. The protein migrates as 45-50 kDa under reducing (R) condition (SDS-PAGE) due to glycosylation.

Endotoxin
Less than 1.0 EU per μg of the Human BTLA (31-134), Fc Tag by the LAL method.

Purity
>92% as determined by SDS-PAGE.

Formulation
Lyophilized from 0.22 μm filtered solution in Tris with Glycine, Arginine and NaCl, pH7.5. Normally trehalose is added as protectant before lyophilization.

Reconstitution
See Certificate of Analysis for details of reconstitution instruction and specific concentration.

Storage
For long term storage, the product should be stored at lyophilized state at -20°C or lower.
Please avoid repeated freeze-thaw cycles.
This product is stable after storage at:
-20°C to -70°C for 12 months in lyophilized state;
-70^°C for 3 months under sterile conditions after reconstitution.

Bioactivity
Please refer to product data sheet.

References

(1) Watanabe N., et al., 2003, Nat. Immunol. 4:670-679.
(2) Gavrieli M., et al., 2003, Biochem. Biophys. Res. Commun. 312:1236-1243.
(3) Sedy J.R., et al., 2005, Nat. Immunol. 6:90-98.