Recombinant Human Active Caspase-2 Protein, CF

Catalog # Availability Size / Price Qty
702-C2-010/CF

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Recombinant Human Active Caspase-2 Protein, CF Summary

Product Specifications

Purity
>95%, by SDS-PAGE under reducing conditions and visualized by silver stain
Endotoxin Level
<1.0 EU per 1 μg of the protein by the LAL method.
Activity
Measured by its ability to cleave the fluorogenic peptide substrate Ac-VDVAD-AFC. The specific activity is >1000 pmol/min/µg, as measured under the described conditions.
Source
E. coli-derived human Caspase-2 protein
Gly170-Asp333 & Ala348-Tyr452
Accession #
N-terminal Sequence
Analysis
Gly170 & Ala348
Predicted Molecular Mass
12 kDa & 18 kDa
SDS-PAGE
10 kDa & 17 kDa, reducing conditions

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702-C2/CF (carrier free)

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.

702-C2/CF

Formulation Supplied as a 0.2 μm filtered solution in HEPES, NaCl, DTT and Sucrose.
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

Materials
  • Assay Buffer: 25 mM HEPES, 0.1% (w/v) CHAPS, 10 mM DTT, pH 7.5
  • Recombinant Human Active Caspase‑2 (rhCaspase-2) (Catalog # 702-C2/CF)
  • Substrate: Ac-Val-Asp-Val-Ala-Asp-AFC (MP Biomedicals, Catalog # AFC142), 10 mM stock in DMSO
  • F16 Black Maxisorp Plate (Nunc, Catalog # 475515)
  • Fluorescent Plate Reader (Model: SpectraMax Gemini EM by Molecular Devices) or equivalent
  1. Dilute rhCaspase-2 to 1 ng/µL in Assay Buffer.
  2. Incubate at room temperature for 15 minutes.
  3. Dilute Substrate to 200 µM with Assay Buffer.
  4. Load into plate 50 µL of 1 ng/µL rhCaspase-2 and start the reaction by adding 50 µL of 200 µM Substrate.
  5. Read at excitation and emission wavelengths of 400 nm and 505 nm (top read), respectively in kinetic mode for 5 minutes.
  6. Calculate specific activity:

     Specific Activity (pmol/min/µg) =

Adjusted Vmax* (RFU/min) x Conversion Factor** (pmol/RFU)
amount of enzyme (µg)

     *Adjusted for Substrate Blank
     **Derived using calibration standard 7-amino, 4-(trifluoromethyl)coumarin (Calbiochem, Catalog # 164580).

Per Well:
  • rhCaspase-2: 0.050 µg
  • Substrate: 100 µM
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Background: Caspase-2

Caspase-2 (Cysteine-aspartic acid protease 2/Casp2; also NEDD2 and ICH-1) is a 30‑32 kDa member of the peptidase C14A/IL‑1 beta ‑converting family of enzymes (1‑3). It is widely expressed and is an integral component of the apoptotic cascade. Based on the length of its prodomain, caspase-2 has been considered to be an initiator caspase. However, studies have shown that other caspases (such as Casp 3) activate procaspase 2, and Caspase-2 likely acts on key cellular molecules such as BID, Golgin 160 and DFF45/ICAD (2, 4, 5). Thus, Caspase-2 is perhaps more likely to be a specialized executioner caspase. Human procaspase-2 is a 48‑51 kDa, 452 amino acid (aa) protein (4‑7). It is known to exist as a disulfide-linked homodimer via covalent linkage at Cys436 (2, 5). But this dimeric state may not be sufficient for (auto)activation. Actual activation may occur following oligomerization within the context of activating platforms such as DISC (death-inducing signaling complex) or the PIDDosome (8‑10). Initially, procaspase-2 undergoes proteolytic cleavage to generate an N-terminal 333 aa p34/34 kDa subunit, and a 119 aa C-terminal p14/14 kDa subunit (5). The p34 and p14 subunits are further processed to generate the prodomain (aa 1‑169), plus the mature p18 (aa 170‑333) and p12 (aa 348‑452) subunits (4‑6). Notably, each p18:p12 noncovalent heterodimer demonstrates proteolytic activity around a catalytic site at aa 318‑322, and, due to an nuclear localization signal within the prodomain, may be found in either nucleus or cytoplasm (11, 12). There are multiple potential isoform variants. Individually, or in combination, there is an alternative start site at Met18, a substitution of two aa for aa 107‑452, a second substitution of 14 aa for aa 309‑322, and a third substitution of 22 aa for aa 323‑452 (6, 7, 13). The human and mouse procaspase 2 precursors are 90% aa identical, with the majority of differences lying in the prodomain.

References
  1. Chowdhury, I. et al. (2008) Comp. Biochem. Physiol. B 151:10.
  2. Krumschnabel, G. et al. (2009) Cell Death Differ.16:195.
  3. Kitevska, T. et al. (2009) Apoptosis 14:829.
  4. Paroni, G. et al. (2001) J. Biol. Chem. 276:21907.
  5. Li, H. et al. (1997) J. Biol. Chem. 272:21010.
  6. SwissProt. Accession # P42575.
  7. Wang, L. et al. (1994) Cell 78:739.
  8. Chang, D.W. et al. (2003) J. Biol. Chem. 278:16466.
  9. Olsson, M. et al. (2009) Oncogene 28:1949.
  10. Tinel, A. & J. Tschopp (2004) Science 304:843.
  11. Schweizer, A. et al. (2003) J. Biol. Chem. 278:42441.
  12. Colussi, P.A. et al. (1998) J. Biol. Chem. 273:24535.
  13. Droin, N. et al. (2000) Cancer Res. 60:7039.
  14.  
Entrez Gene IDs
835 (Human); 12366 (Mouse)
Alternate Names
caspase-2; CASP2; CASP-2; caspase 2, apoptosis-related cysteine peptidase; Caspase2; Caspase-2; ICH1; ICH-1; NEDD2; NEDD-2; PPP1R57

Citations for Recombinant Human Active Caspase-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.

3 Citations: Showing 1 - 3
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  1. Anamorsin, a novel caspase-3 substrate in neurodegeneration.
    Authors: Yun N, Lee Y, Kim C, Shibayama H, Tanimura A, Hamanaka Y, Kanakura Y, Park I, Jo A, Shin J, Ju C, Kim W, Oh Y
    J Biol Chem, 2014;289(32):22183-95.
    Species: Mouse
    Sample Types: Recombinant Protein
    Applications: Enzyme Assay
  2. Degradomics reveals that cleavage specificity profiles of caspase-2 and effector caspases are alike.
    Authors: Wejda M, Impens F, Takahashi N, Van Damme P, Gevaert K, Vandenabeele P
    J Biol Chem, 2012;287(41):33983-95.
    Species: Human
    Sample Types: Cell Lysates
    Applications: Enzyme Assay
  3. Fine-tuning nucleophosmin in macrophage differentiation and activation.
    Authors: Guery L, Benikhlef N, Gautier T, Paul C, Jego G, Dufour E, Jacquel A, Cally R, Manoury B, Vanden Berghe T, Vandenabeele P, Droin N, Solary E
    Blood, 2011;118(17):4694-704.
    Species: Human
    Sample Types: Recombinant Protein
    Applications: Enzyme Assay

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