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Recombinant Human XIAP (BIR3) Protein, CF

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Summary
Reactivity HuSpecies Glossary
Applications Inhibition Activity
Format
Carrier-Free

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Recombinant Human XIAP (BIR3) Protein, CF Summary

Details of Functionality
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 <300 nM.
Optimal dilutions should be determined by each laboratory for each application.
Source
E. coli-derived human XIAP protein
Asn252-Thr356, with an N-terminal Met and 6-His tag
Accession #
N-terminal Sequence
Met
Protein/Peptide Type
Recombinant Enzymes
Gene
XIAP
Purity
>95%, by SDS-PAGE under reducing conditions and visualized by silver stain

Applications/Dilutions

Dilutions
  • Inhibition Activity
Theoretical MW
13 kDa.
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
11 kDa, reducing conditions
Publications
Read Publications using
895-XB in the following applications:

Packaging, Storage & Formulations

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.
Buffer
Supplied as a 0.2 μm filtered solution in HEPES, NaCl and DTT.
Purity
>95%, by SDS-PAGE under reducing conditions and visualized by silver stain
Assay Procedure
  • Jurkat E6 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
  • Formulation Buffer: 25 mM HEPES, 0.1 M NaCl, 1 mM DTT, pH 8.5
  • Recombinant Human XIAP BIR3 Domain  (rhXIAP) (BIR3) (Catalog # 895-XB)
  • 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 with NaOH
  • Substrate: Ac-Asp-Glu-Val-Asp-AFC (DEVD-AFC) (MP Biomedicals, 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 rhXIAP (BIR3) MW: 13,047 Da) in Formulation Buffer. Make the following serial dilutions: 5000, 2500, 1500, 500, 250, 50, 25, and 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 rhXIAP (BIR3)  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 37 °C.
  6. After incubation, add 100 μL of Assay Buffer to each vial for a five-fold 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 rhXIAP (BIR3)  by plotting normalized activity vs. reaction concentration of rhXIAP (BIR3) (step 4) with 4-PL fitting.
  11. Normalized activity may be determined using the following equation:
         % Normalized Activity = Sample (RFU/min) - Inactive Control** (RFU/min) x 100%
    Total Control (RFU/min)
Per Reaction:
  • rhXIAP (BIR3) curve:  2000, 1000, 600, 200, 100, 20, 10, and 2 nM
  • Substrate: 50 μM

Notes

This product is produced by and ships from R&D Systems, Inc., a Bio-Techne brand.

Alternate Names for Recombinant Human XIAP (BIR3) Protein, CF

  • API3X-linked inhibitor of apoptosis protein
  • apoptosis inhibitor 3
  • baculoviral IAP repeat-containing 4
  • baculoviral IAP repeat-containing protein 4
  • BIRC4
  • BIRC4XLP2
  • E3 ubiquitin-protein ligase XIAP
  • EC 6.3.2.-
  • hIAP3
  • hIAP-3
  • hILP
  • IAP3
  • IAP-3
  • IAP-like protein
  • ILP
  • ILP1
  • Inhibitor of apoptosis protein 3
  • MIHA
  • XIAP
  • X-linked IAP
  • X-linked inhibitor of apoptosis

Background

XIAP (X-chromosome linked inhibitor of apoptosis) is a member of the inhibitor of apoptosis (IAP) family of proteins that inhibit caspases. The BIR3 domain inhibits caspase-9. The ability of XIAP (BIR3 domain) to inhibit caspases is prevented by SMAC/Diablo.

  1. Deveraux, Q. et al. (1998) EMBO J. 17(8):2215.
  2. Deveraux, Q. et al. (1999) EMBO J. 18(19):5242.
  3. Verhagen, A. et al. (2000) Cell 102:43.
  4. Chai, J. et al. (2001) Cell 104:769.
  5. Riedl, S. (2001) Cell 104:791.
  6. Suzuki, Y. (2001) J. Biol. Chem. 276(29):27058.
  7. Ekert, P. et al. (2001) J. Cell Biol. 152(3):483.
  8. Du, C. et al. (2000) Cell 102:33.

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Publications for XIAP (895-XB)(2)

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Apoptosis and Necroptosis Part II: Inhibitors of apoptosis proteins (IAPs); Key regulators of the balance between necroptosis, apoptosis and survival
In the first installment of this two-part blog post titled "Apoptosis and Necroptosis: Important factors to identify both types of programmed cell death", the mechanisms by which cell death occurs and ways to identify these pathways were ...  Read full blog post.

Caspase 9 - an important apoptosis marker
Caspases are essential mediators of programmed cell death and are needed for both the induction of apoptosis as well as for aiding the degradation of cellular structures. Initiator caspases (such as Caspase-9) sense and respond to various signals i...  Read full blog post.

cIAP2 - balancing cell death and cell survival
The inhibitor of apoptosis proteins (IAPs) are important regulators of cell death and inflammation. The cellular inhibitor of apoptosis protein 2 (cIAP2) contains three Baculovirus IAP repeat (BIR) domains, a Ubiquitin associated (UBA) domain, and ...  Read full blog post.

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Bioinformatics

Gene Symbol XIAP
Uniprot