>85%, by SDS-PAGE under reducing conditions and visualized by silver stain
Applications/Dilutions
Dilutions
Enzyme Activity
Theoretical MW
36 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
38 kDa, reducing conditions
Publications
Read Publications using 1458-HT in the following applications:
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, DTT and Glycerol.
Purity
>85%, by SDS-PAGE under reducing conditions and visualized by silver stain
Assay Procedure
Assay Buffer: 50 mM Tris, pH 8.0
Recombinant Human HTRA2/Omi (rhHTRA2) (Catalog # 1458-HT)
Substrate: beta -Casein (Sigma, Catalog # C-6905), 1.0 mg/mL stock in 25 mM Tris, 0.15 M NaCl, pH 7.5
SDS-PAGE and silver staining reagents
Dilute Substrate to 0.4 mg/mL in Assay Buffer.
Dilute rhHTRA2 to 0.04 mg/mL in Assay Buffer.
Add 25 μL of substrate and 25 μL of rhHTRA2 to reaction tube. Include a control with 25 μL Substrate and 25 μL Assay Buffer.
Incubate the reaction and control for 1 hour at 45 °C.
Stop the reaction by adding SDS-PAGE sample buffer.
Analyze the cleavage by SDS-PAGE followed by silver staining.
Per Reaction:
rhHTRA2: 0.02 mg/mL
Substrate: 0.2 mg/mL
Notes
This product is produced by and ships from R&D Systems, Inc., a Bio-Techne brand.
Alternate Names for Recombinant Human HTRA2/Omi Protein, CF
High temperature requirement protein A2
HtrA serine peptidase 2
HTRA2
HtrA-like serine protease
Omi
OMIOmi stress-regulated endoprotease
PARK13EC 3.4.21.108
PRSS25
PRSS25serine, 25
Serine protease 25
serine protease HTRA2, mitochondrial
Serine proteinase OMI
Background
HtrA2/Omi is the mammalian homologue of bacterial high temperature requirement protein (HtrA). HtrA2/Omi localizes to the mitochondria and is processed to expose an amino-terminal Reaper-like motif similar to SMAC/Diablo. HtrA2/Omi is released from the mitochondria in response to apoptotic insult and can interact with the BIR2 or BIR3 domains of XIAP to relieve caspase-IAP inhibition. This effect can be measured by reversing XIAP-BIR2 (Catalog # 786-XB) inhibition of Caspase-7 (Catalog # 823-C7) cleavage of a fluorogenic peptide (DEVD-AFC, MP Bio, Catalog # AFC-138). IC50 values for this effect are typically between 0.2 and 1.5 μM. HtrA2/Omi is trimeric and functions as a serine protease. The serine protease activity may play a more central role in apoptosis than its IAP antagonizing function. A PDZ domain regulates the serine protease activity by blocking access to the active site. The specificity of the protease is yet to be defined and no endogenous substrates are known to date.
Suzuki, Y. et al. (2001) Mol. Cell. 8:613.
van Loo, G. et al. (2002) Cell Death & Diff. 9:20.
Hedge, R. et al. (2001) J. Biol. Chem. 277:432.
Verhagen, A. et al. (2001) J. Biol. Chem. 277:445.
Martins, L. et al. (2002) J. Biol. Chem. 277:439.
Silke, J., and A. Verhagen (2002) Cell Death & Diff. 9:362.
Savopoulos, J. et al. (2000) Protein Expression & Purification 19:227.
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