Recombinant Human Bcl-2 (minus C-Terminus) Protein, CF

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Recombinant Human Bcl-2 (minus C-Terminus) Protein, CF Summary

Product Specifications

>95%, by SDS-PAGE under reducing conditions and visualized by silver stain
Endotoxin Level
<0.01 EU per 1 μg of the protein by the LAL method.
Measured by its ability to inhibit Caspase-8-cleaved BID-mediated release of cytochrome c from isolated mouse liver mitochondria using the Rat/Mouse Cytochrome c Quantikine ELISA (Catalog # MCTC0) to quantify cytochrome c. The typical EC50 is less than 500 nM in the presence of 54 nM Recombinant Human BID Caspase-8-cleaved (Catalog # 882-B8).
Optimal dilutions should be determined by each laboratory for each application.
E. coli-derived human Bcl-2 protein
Ala2-Asp211, with a C-terminal 10-His tag
Accession #
N-terminal Sequence
Predicted Molecular Mass
24.5 kDa
27 kDa, under reducing and non-reducing conditions

Product Datasheets

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Carrier Free

What does CF mean?

CF stands for Carrier Free (CF). We typically add Bovine Serum Albumin (BSA) as a carrier protein to our recombinant proteins. Adding a carrier protein enhances protein stability, increases shelf-life, and allows the recombinant protein to be stored at a more dilute concentration. The carrier free version does not contain BSA.

What formulation is right for me?

In general, we advise purchasing the recombinant protein with BSA for use in cell or tissue culture, or as an ELISA standard. In contrast, the carrier free protein is recommended for applications, in which the presence of BSA could interfere.


Formulation Supplied as a 0.2 μm filtered solution in HEPES, KCl, DTT and Glycerol.
Shipping The product is shipped with dry ice or equivalent. Upon receipt, store it immediately at the temperature recommended below.
Stability & Storage: Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  • 6 months from date of receipt, -20 to -70 °C as supplied.
  • 3 months, -20 to -70 °C under sterile conditions after opening.

Assay Procedure

  • Recombinant Human Bcl‑2 Minus C‑Terminus (Catalog # 827-BC)
  • Recombinant Human BID Caspase-8-cleaved (Catalog # 882-B8)
  • Crude or enriched mouse liver mitochondria (See Preparation of mouse liver mitochondria at
  • Dilution Buffer: 25 mM HEPES-KOH (pH 7.4), 0.1 M KCl, 10% Glycerol, 1 mg/mL fatty acid free BSA* (Sigma, Catalog # A6003) 
  • Mitochondria Buffer: 125 mM KCl, 0.5 mM MgCl2, 3.0 mM Succinic acid, 3.0 mM Glutamic acid, 10 mM HEPES-KOH (pH 7.4), 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 solution should be prepared at 100 mg/mL.

Note: All buffers, proteins and tubes should be kept on ice. Assay volumes are 75 μL and are combined in 0.5 mL Eppendorf tubes.
  1. Prepare a stock solution of Recombinant Human BID Caspase-8-cleaved (MW: 22 kDa) in Dilution Buffer at 9.0 μg/mL. The final concentration will be 54 nM.
  2. Prepare dilutions of Recombinant Human Bcl‑2 Minus C‑Terminus (MW: 24.5 kDa) in Dilution Buffer at concentrations of 9000, 3000, 900, 300, 90, 30, and 9 nM.  The final concentration range will be 3,000 to 3 nM in a total rxn volume of 75 μL.
  3. Aliquot 25 μL of each of the Bcl-2 dilutions to a series of tubes. Add 10 μL of the Recombinant Human BID Caspase-8-cleaved to each tube and gently mix. Incubate for 60 min. at room temperature. Include one sample without Recombinant Human Bcl‑2 Minus C‑Terminus (cleaved BID control).
  4. Add 12 μL of mitochondria (approximately 25-30 μg) and 28 μL of Mitochondria Buffer containing protease inhibitors and BSA to each tube.
  5. Two 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.
  6. Cap the tubes and gently mix the contents for 5-10 seconds. Incubate in a 30 °C water bath for 30 min.
  7. Total Cytochrome c in the assay should be determined by freezing the entire 75 μL rxn mix immediately after incubation at 30 °C.
  8. Centrifuge the remaining samples at 16,000 x g for 5 min. 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.
  9. 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 and additional instructions in the Rat/Mouse Cytochrome c Quantikine ELISA Kit  product insert (Catalog # MCTC0).
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Background: Bcl-2

Bcl-2 is a member of a family of proteins that regulates outer mitochondrial membrane permeability (1, 2). Bcl-2 is an anti-apoptotic member that prevents release of cytochrome c from the mitochondria intermembrane space into the cytosol. Bcl-2 is present on the outer mitochondrial membrane and is also found on other membranes in some cell types. Natural Bcl-2 contains a carboxyl-terminal mitochondria targeting sequence. Recombinant Bcl-2, missing the mitochondrial targeting sequence, maintains its ability to neutralize pro-apoptotic Bcl-2 family members. Neutralization by Bcl-2 appears to be through binding the BH3 region of pro-apoptotic Bcl-2 family members. This activity does not require the mitochondrial targeting sequence.

  1. Gross, A. et al. (1999) Genes and Develop. 13:1899.
  2. Kroemer, G. (1997) Nature Med. 3:614.
Long Name
B Cell Lymphoma/Leukemia 2
Entrez Gene IDs
596 (Human); 12043 (Mouse); 24224 (Rat)
Alternate Names
apoptosis regulator Bcl-2; B-cell CLL/lymphoma 2; Bcl2; Bcl-2

Citations for Recombinant Human Bcl-2 (minus C-Terminus) Protein, CF

R&D Systems personnel manually curate a database that contains references using R&D Systems products. The data collected includes not only links to publications in PubMed, but also provides information about sample types, species, and experimental conditions.

3 Citations: Showing 1 - 3
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  1. Desensitized chimeric antigen receptor T cells selectively recognize target cells with enhanced antigen expression
    Authors: C Han, SJ Sim, SH Kim, R Singh, S Hwang, YI Kim, SH Park, KH Kim, DG Lee, HS Oh, S Lee, YH Kim, BK Choi, BS Kwon
    Nat Commun, 2018-02-01;9(1):468.
    Species: Human
    Sample Types: Whole Cells
    Applications: Bioassay
  2. Extracellular Administration of BCL2 Protein Reduces Apoptosis and Improves Survival in a Murine Model of Sepsis.
    Authors: Iwata A, de Claro RA, Morgan-Stevenson VL
    PLoS ONE, 2011-02-24;6(2):e14729.
    Species: Mouse
    Sample Types: In Vivo
    Applications: In Vivo
  3. Interactions between important regulatory proteins and human alphaB crystallin.
    Authors: Ghosh JG, Shenoy AK, Clark JI
    Biochemistry, 2007-05-08;46(21):6308-17.
    Species: Human
    Sample Types: Peptide
    Applications: ELISA-Based Protein Pin Array


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