Biological activity was determined by its inhibitory effect of the 4 - 1BBL mediated stimulation of IL - 8 production by human PBMC. About 90% of inibition was seen using a concentration of 1μg for both 4 - 1BBL and 4 - 1BBR.
Properties
PURITY:
Greater than 98% by SDS-PAGE gel and HPLC analyses.
Endotoxin level is less than 0.1 ng per μg (1EU/μg).
PHYSICAL STATE:
Lyophilized
STORAGE CONDITIONS:
The lyophilized 4-1BB Receptor recombinant protein is stable for at least 2 years from date of receipt at -20˚C. Reconstituted 4-1BB Receptor is stable for at least 3 months when stored in working aliquots with a carrier protein at -20˚C. As with any protein, exposing 4-1BB Receptor recombinant protein to repeated freeze / thaw cycles is not recommended. When working with proteins care should be taken to keep recombinant protein at a cool and stable temperature.
4-1BB Receptor, a member of the TNF superfamily of receptors, is mainly expressed on the surface of a variety of T cells, but also found in B cells, monocytes, and various transformed cell lines. 4-1BB Receptor binds to 4-1BBL to provide a co-stimulatory signal for T lymphocytes. Signaling by 4-1BB Receptor has been implicated in the antigen-presentation process and generation of cytotoxic T cells. The human 4-1BB Receptor gene codes for a 255 amino acid type I transmembrane protein containing a 17 amino acid N-terminal signal sequence, a 169 amino acid extracellular domain, a 27 amino acid transmembrane domain and a 42 amino acid cytoplasmic domain. Recombinant human soluble 4-1BB Receptor is a 167 amino acid polypeptide (17.7 kDa), which contains the cysteine rich TNFR-like extracellular domain of 4-1BB Receptor.
Specifications
