Recombinant Human cIAP-1 (HIAP-2) Protein, CF

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Recombinant Human cIAP-1 (HIAP-2) Protein, CF Summary

Product Specifications

>85%, by SDS-PAGE under reducing conditions and visualized by silver stain
Measured by its ability to inhibit DEVD-AFC cleavage activity in cell extracts activated by addition of cytochrome c and dATP. The IC50 for this effect is 25-1000 nM.
Optimal dilutions should be determined by each laboratory for each application.
E. coli-derived human cIAP-1/HIAP-2 protein
ATVID 10-His tag SIEGRA Human cIAP-1
Accession # Q13490
N-terminus C-terminus
Accession #
N-terminal Sequence
Predicted Molecular Mass
72 kDa
68 kDa, 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, NaCl, 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, -70 °C as supplied.
  • 3 months, -70 °C under sterile conditions after opening.

Assay Procedure

  • Jurkat A3 wild type cell extracts (see supplementary methods for preparation)
  • Extraction Buffer: 50 mM HEPES, 10 mM KCl, 5 mM EGTA, 1 mM MgCl2, 0.2% CHAPS, 0.2 mM DTT, pH 7.5
  • Assay Buffer: 10 mM HEPES, 0.5 mM EGTA, 5 mM DTT, 10% Glycerol, pH 7.5
  • Recombinant Human cIAP‑1/HIAP‑2 (rhcIAP-1) (Catalog # 818-IA)
  • Cytochrome C, Bovine heart (Sigma, Catalog # C3131), 2 mg/mL stock in deionized water
  • dATP (Sigma, Catalog # D6500), 10 mM stock adjusted to pH 7.5
  • Cell Extracts from Jurkat A3 wild type cells (see above protocol)
  • Substrate: Ac-Asp-Glu-Val-Asp-AFC (DEVD-AFC) (MP Biomendicals, Catalog # AFC138), 10 mM stock in DMSO
  • F16 Black Maxisorp Plate (Nunc, Catalog # 475515)
  • Fluorescent Plate Reader (Model: SpectraMax Gemini EM by Molecular Devices) or equivalent
Note: All reagents and assay components should be kept on ice until use.
  1. Thaw cell extracts and centrifuge in a microcentrifuge at 14,000 rpms for 5 minutes at 4 °C. Transfer supernatants to chilled tubes and use within 1 hour.
  2. Prepare a curve of rhcIAP-1 (MW: 72,000 Da) in Extraction Buffer. Make the following serial dilutions: 5000, 2000, 1000, 500, 250, 125, 62.5, and 12.5 nM. Note: High point may not be achievable depending on lot received.
  3. Prepare the activator mixture by combining equal volumes of 2 mg/mL Cytochrome C and 10 mM dATP for working concentrations of 1 mg/mL and 5 mM, respectively.
  4. Prepare reaction mixtures in tubes by combining 10 μL of each rhcIAP-1 curve dilution, 10 μL of cell extract supernatant, and 5 μL of the cytochrome C/dATP activator mixture. Also, prepare the following controls:
    1. Total Control: 10 μL of Extraction Buffer, 10 μL of cell extract supernatant, and 5 μL of the cytochrome C/dATP activator mixture.
    2. Inactive Control: 15 μL of Extraction Buffer and 10 μL of cell extract supernatant.  The total reaction volume is 25 μL.
  5. Incubate for 60 minutes at 30 °C.
  6. After incubation, add 100 μL of Assay Buffer to each vial for a 1/5 dilution. Mix briefly.
  7. Dilute Substrate to 100 μM in Assay Buffer.
  8. In a plate load 50 μL of diluted incubated reaction mixtures, and start the reaction by adding 50 μL of 100 μM Substrate.
  9. Read at excitation and emission wavelengths of 400 nm and 505 nm, respectively, in kinetic mode for 5 minutes.
  10. Derive the 50% inhibiting concentration (IC50) of rhcIAP-1 by plotting normalized activity vs. reaction concentration of rhcIAP-1 (step 4) with Semi-Log Fitting [y = A + B * Log(x)].  Solve for x when y = 50.
  11. Normalized activity may be determined using the following equation:
  12.      % Normalized Activity = Sample (RFU/min) - Inactive Control** (RFU/min) x 100%
    Total Control (RFU/min)
Per Reaction:
  • rhcIAP-1 curve:  2000, 800, 400, 200, 100, 50, 25, and 5 nM
  • Substrate: 50 μM
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Background: cIAP-1/HIAP-2

cIAP-1 (also known as MIHB and HIAP-2) is a member of the inhibitor of apoptosis (IAP) family of proteins that inhibit the proteolytic activity of mature caspases. cIAP-1 has 3 BIR (baculovirus inhibitor of apoptosis) domains, a RING finger domain, and a caspase recruitment domain (CARD). cIAP-1 inhibits caspases by interaction of the BIR domain with the active caspase. Caspase activity may be restored through interactions with the Reaper like motif on mitochondrial proteins such as SMAC/Diablo or HTRA-2/Omi. cIAP-1 is reported to be cleaved by caspases in fetal rat hepatocytes treated with TGF-beta.

  1. Roy, N. et al. (1997) EMBO J. 23:6914.
  2. Deveraux, Q. et al. (1997) Nature 388:300.
  3. Deveraux, Q. and J. Reed (1999) Genes & Develop. 13:239.
  4. Herrera, B. et al. (2002) FEBS Letters 520:93.
Long Name
Cellular Inhibitor of Apoptosis Protein 1
Entrez Gene IDs
329 (Human); 11797 (Mouse)
Alternate Names
API1Hiap-2; apoptosis inhibitor 1; baculoviral IAP repeat containing 2; baculoviral IAP repeat-containing 2; baculoviral IAP repeat-containing protein 2; BIRC2; cIAP1; c-IAP1; cIAP-1; hIAP2; HIAP-2; IAP homolog B; IAP2; IAP-2; Inhibitor of apoptosis protein 2; MIHB; MIHBHIAP2; NFR2-TRAF signalling complex protein; RING finger protein 48; RNF48hiap-2; TNFR2-TRAF-signaling complex protein 2

Citations for Recombinant Human cIAP-1 (HIAP-2) 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.

6 Citations: Showing 1 - 6
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  1. DNA damage and S phase-dependent E2F1 stabilization requires the cIAP1 E3-ubiquitin ligase and is associated with K63-poly-ubiquitination on lysine 161/164 residues
    Authors: V Glorian, J Allègre, J Berthelet, B Dumetier, PM Boutanquoi, N Droin, C Kayaci, J Cartier, S Gemble, G Marcion, D Gonzalez, R Boidot, C Garrido, O Michaud, E Solary, L Dubrez
    Cell Death Dis, 2017-05-25;8(5):e2816.
    Species: Bacteria - E. Coli, Human
    Sample Types: Protein, Recombinant Protein
    Applications: Bioassay
  2. USP11-dependent selective cIAP2 deubiquitylation and stabilization determine sensitivity to Smac mimetics.
    Authors: Lee E, Seong D, Seo J, Jeong M, Lee H, Song J
    Cell Death Differ, 2015-01-23;22(9):1463-76.
    Species: Human
    Sample Types: Recombinant Protein
    Applications: Bioassay
  3. Cellular inhibitor of apoptosis (cIAP)-mediated ubiquitination of phosphofurin acidic cluster sorting protein 2 (PACS-2) negatively regulates tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) cytotoxicity.
    Authors: Guicciardi, Maria Eu, Werneburg, Nathan W, Bronk, Steven F, Franke, Adrian, Yagita, Hideo, Thomas, Gary, Gores, Gregory
    PLoS ONE, 2014-03-14;9(3):e92124.
    Applications: Bioassay
  4. Role of melanoma inhibitor of apoptosis (ML-IAP) protein, a member of the baculoviral IAP repeat (BIR) domain family, in the regulation of C-RAF kinase and cell migration.
    Authors: Oberoi-Khanuja, Tripat K, Karreman, Christia, Larisch, Sarit, Rapp, Ulf R, Rajalingam, Krishnar
    J Biol Chem, 2012-06-18;287(34):28445-55.
    Species: Human
    Sample Types: Whole Cells
    Applications: Bioassay
  5. Small molecules destabilize cIAP1 by activating auto-ubiquitylation.
    Authors: Sekine K, Takubo K, Kikuchi R, Nishimoto M, Kitagawa M, Abe F, Nishikawa K, Tsuruo T, Naito M
    J. Biol. Chem., 2008-01-29;283(14):8961-8.
    Species: Human
    Sample Types: Recombinant Protein
    Applications: Surface Plasmon Resonance
  6. Enhanced ubiquitination of cytoskeletal proteins in pressure overloaded myocardium is accompanied by changes in specific E3 ligases.
    Authors: Balasubramanian S, Mani S, Shiraishi H, Johnston RK, Yamane K, Willey CD, Cooper G, Tuxworth WJ, Kuppuswamy D
    J. Mol. Cell. Cardiol., 2006-08-22;41(4):669-79.
    Applications: Western Blot


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