Recombinant Human 4-BBL (TNFSF9) (E. coli)

Z10225520 µg


DescriptionHuman 4-BBL or TNFSF9 is a member of the TNF superfamily. It is a type 2 transmembrane protein expressed on activated T-cells. It is a bidirectional signal transducer which acts as a costimulatory receptor molecule on T lymphocytes. Its functions primarily stimulate the immune response by promoting the release of cytokines such as IL-2 and IFN-gamma. TNFSF9 works with TNFRSF9 for the generation of cytotoxic T cells, proliferation of T-cells as well as antigen presentation. It also reactivates T lymphocytes which have become anergic. It is also expressed on activated NK cells, B-cells, macrophages, dendritic cells and some brain cells. Recombinant Human 4-BBL is a 19.6 kDa protein.
Growth Factor Size20 µg
Unit quantity20 µg
FamilyTNF Super-family
AliasesTNFSF9, CD137L, 4BBL
Gene SymbolTNFSF9
Gene ID8744
Accession NumberP41273
SourceE. coli
SpeciesHuman (H. sapiens)
AppearanceLyophilized Powder
Molecular Weight19.6 kDa
Endotoxin Level<1.0 EU/µg of recombinant protein as determined by the LAL method
Purity>95% as determined by SDS-PAGE
FormulationLyophilized from a 0.2 µm filtered solution in PBS, pH 7.4
Functioncoming soon
ReconstitutionA quick spin of the vial followed by reconstitution in distilled water to a concentration not less than 0.1 mg/mL. This solution can then be diluted into other buffers.
StorageThe lyophilized protein is stable for at least one year from date of receipt at -70°C. Upon reconstitution, this cytokine can be stored in working aliquots at 2° - 8°C for one month, or at -20°C for six months, with a carrier protein without detectable loss of activity. Avoid repeated freeze/thaw cycles.
UsageFor research use only. Not for diagnostic or therapeutic use.

How are endotoxin levels measured?
1. For estimating the endotoxin levels; we use the LAL (Limulus Amebocyte Lysate) method: The lysate from horseshoe crab amebocytes clots in the presence of very low endotoxin. This reaction is the basis of the Limulus amebocyte lysate (LAL) assay which was approved by the FDA in 1970. · Endotoxin is generally measured in Endotoxin Units per milliliter (EU/mL). · For recombinant proteins: EU is reported per microgram of protein. · One EU = 0.1-0.2 ng endotoxin/µg of protein. · At abm, we do the LAL chromogenic assays that can detect down to 0.01 EU/ml.
With regard to the BSA levels in some Growth Factors and Cytokines, can you please provide an explanation as to why they are so high?
The amount of BSA, as part of the formulation of a protein, can vary considerably depending on how much BSA was deemed optimum/necessary for protein stability in combination with /in-lieu of - other possible additives. The aforementioned formulations are somewhat analogous to the “carrier” versions of many formulations from “R and D systems” that have as high as 50 µg of BSA per µg of the recombinant protein product. If, needed or desired, abm scientists can substitute BSA for other stabilizing additives for most formulations.
Are your Escherichia coli sourced growth factors: 1) Human derived materials free? 2) Recombinant proteins free?
Yes, all of abm's growth factors made in Escherichia coli using recombinant technology contain no human derived-products or other recombinant proteins. In the rare cases of BSA presence, this will be mentioned in the product's formulation.

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