Measured by its ability to induce cytochrome c release from isolated mouse liver mitochondria. The typical EC50 for cytochrome c releasing activity is <100 nM. Cytochrome c is quantified using the Rat/Mouse Cytochrome c Quantikine® ELISA Kit (Catalog # MCTC0). The EC50 for the desired application should be determined. Uncleaved Recombinant Mouse BID is available (Catalog # 860-MB).
>95%, by SDS-PAGE under reducing conditions and visualized by silver stain
Applications/Dilutions
Dilutions
Bioactivity
Theoretical MW
7 kDa (N-terminal fragment) & 15 kDa (C-terminal fragment). Disclaimer note: The observed molecular weight of the protein may vary from the listed predicted molecular weight due to post translational modifications, post translation cleavages, relative charges, and other experimental factors.
SDS-PAGE
7 kDa and 15 kDa, under reducing and non-reducing conditions
Publications
Read Publications using 883-M8 in the following applications:
BID Dilution Buffer: 25 mM HEPES-KOH (pH 7.4), 0.1 M KCl, 1 mg/mL fatty acid free BSA*
Mitochondria Buffer: 125 mM KCl, 0.5 mM MgCl2, 3.0 mM Succinic acid, 3.0 mM Glutamic acid, 10 mM HEPES-KOH,(pH7.4), 1 mg/mL BSA*, containing 25 μg/mL Leupeptin, 25 μg/mL Pepstatin, 3 μg/mL Aprotinin, 100 μM PMSF, and 10 μM Boc-Asp-FMK caspase inhibitor *Note: Protease inhibitors and BSA should be added to the buffer immediately prior to use. BSA stock solution should be prepared at 100 mg/mL.
Note: All buffers, proteins and tubes should be kept on ice until indicated. Assay volumes are 75 μL and are combined in 0.5 mL Eppendorf tubes.
Prepare dilutions of Recombinant Mouse BID Caspase-8-cleaved (MW: 22 kDa) in Dilution Buffer at concentrations of 500, 150, 50, 15, 5, 1.5, 0.5 and 0.15nM. The final concentration range will be 100 to 0.03 nM in a total reaction volume of 75 μL.
Aliquot 15 μL of each of the BID dilutions to a series of tubes containg an additional 20 μL of Dilution Buffer and gently mix.
Initiate the reaction by adding 12 μL of mitochondria (approximately 25-30 μg) and an additional 28 μL of Mitochondria Buffer with added protease inhibitors and BSA to each tube.
Two additional control samples must be run for each assay to determine the total amount of Cytochrome c that can be released from the mitochondria and the amount of spontaneously released Cytochrome c. Set up two samples containing only mitochondria and the appropriate buffers that have not been treated with any test proteins.
Cap the tubes and gently mix the contents for 5-10 seconds. Incubate in a 30 °C water bath for 30 minutes.
Total Cytochrome c in the assay should be determined by freezing the entire 75 μL reaction mix immediately after incubation at 30 °C.
Centrifuge the remaining samples at 16,000 x g for 5 minutes at 2-8 °C. Remove and transfer a 50 μL aliquot of the supernatant to a new chilled tube. Samples may be analyzed immediately or stored at -20°C in a manual defrost freezer.
Measure the levels of Cytochrome c in these samples using the Rat/Mouse Cytochrome c Quantikine ELISA Kit (Catalog # MCTC0) . See the Preparation of Samples for the Cytochrome c ELISA at http://www.rndsystems.com/literature_cytochrome_c_release_assays-bcl2.aspx and additional instructions in the Rat/Mouse Cytochrome c Quantikine ELISA Kit product insert (Catalog # MCTC0).
Notes
This product is produced by and ships from R&D Systems, Inc., a Bio-Techne brand.
Alternate Names for Recombinant Mouse BID (Caspase-8-cleaved) Protein, CF
apoptic death agonist
BH3 interacting domain death agonist
BH3-interacting domain death agonist
BID isoform ES(1b)
BID isoform L(2)
BID isoform Si6
BID
desmocollin type 4
FP497
Human BID coding sequence
MGC15319
MGC42355
p22 BID
tbid
Background
Bid is a 195 amino acid member of the Bcl‑2 family of proteins that regulates outer mitochondrial membrane permeability (1). Bid is a pro-apoptotic member that causes cytochrome c to be released from the mitochondria intermembrane space into the cytosol. In healthy cells Bid is cytosolic. In response to Fas ligand or TNF Bid is cleaved by Caspase-8 and it then relocates to the mitochondria outer membrane (2, 3). Cleavage of Bid by Caspase-8 generates a new N-terminal that contains a terminal glycine. It appears that the glycine is myristoylated and myristoylation serves to target Bid to the mitochondria (4). Bid may then interact with another pro-apoptotic Bcl‑2 family member Bak (5). Interaction of Bid with Bak causes altered mitochondrial membrane permeability. A 9-13 amino acid stretch called the BH3 region (Bcl‑2 homology region) appears to mediate the Bid interaction with other Bcl‑2 family members. Bid is neutralized by binding to the anti-apoptotic member Bcl‑xL.
Gross, A. et al. (1999) Genes and Develop. 13:1899.
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