Synonym
BAFF & APRIL
Source
Human BAFF & APRIL Heterotrimer Protein, His Tag (BAL-H5243) is expressed from human 293 cells (HEK293). It contains AA Glu 140 - Leu 285 & Gln 111 - Leu 250 (Accession # Q9Y275-1 & O75888-1).
Predicted N-terminus: His
Molecular Characterization
This protein carries a polyhistidine tag at the N-terminus. The protein has a calculated MW of 50 kDa. The protein migrates as 55-65 kDa when calibrated against Star Ribbon Pre-stained Protein Marker under reducing (R) condition (SDS-PAGE) due to glycosylation. The protein is a heterotrimer consisting of one BAFF and two APRIL.
Endotoxin
Less than 1.0 EU per μg by the LAL method / rFC method.
Purity
>90% as determined by SDS-PAGE.
>90% as determined by SEC-MALS.
Formulation
Lyophilized from 0.22 μm filtered solution in 25 mM MES, 150 mM NaCl, pH6.0 with trehalose as protectant.
Contact us for customized product form or formulation.
Reconstitution
Please see Certificate of Analysis for specific instructions.
For best performance, we strongly recommend you to follow the reconstitution protocol provided in the CoA.
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.
Background
BAFF and APRIL are two members of the TNF superfamily that are secreted by activated myeloid cells and have costimulatory activity on B cells. BAFF/APRIL signaling regulates a diverse range of biological processes, including cell differentiation, proliferation, survival, and effector functions. Dysregulation of the BAFF/APRIL system has been linked to several inflammatory conditions, specifically autoimmune diseases. Elevated levels of BAFF and APRIL have been reported in autoimmune SLE patients. Both BAFF and APRIL have been described as homotrimeric molecules, a feature common to members of the TNF superfamily. But APRIL and BAFF can form active heterotrimer molecules when co-expressed, and circulating heterotrimer exists in serum samples of patients with systemic immune rheumatic diseases. These findings increase the possibility that the active BAFF/APRIL heterotrimer may play a role in rheumatic diseases and other autoimmune diseases.
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