Human HTRA2/Omi Antibody

Catalog # Availability Size / Price Qty
Detection of Human HTRA2/Omi by Western Blot.
2 Images
Product Details
Citations (2)
Supplemental Products

Human HTRA2/Omi Antibody Summary

Species Reactivity
Detects the mitochondria-processed form of human HTRA2/Omi.
Monoclonal Mouse IgG2B Clone # 229926
Protein A or G purified from hybridoma culture supernatant
E. coli-derived recombinant human HTRA2/Omi
Accession # O43464
Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose. *Small pack size (SP) is supplied either lyophilized or as a 0.2 µm filtered solution in PBS.


Recommended Concentration
Western Blot
1 µg/mL
See below
8-25 µg/mL
Immersion fixed K562 human chronic myelogenous leukemia cell line

Please Note: Optimal dilutions should be determined by each laboratory for each application. General Protocols are available in the Technical Information section on our website.

Scientific Data

Western Blot Detection of Human HTRA2/Omi antibody by Western Blot. View Larger

Detection of Human HTRA2/Omi by Western Blot. Western blot shows lysates of SK-Mel-28 human malignant melanoma cell line, MCF-7 human breast cancer cell line, HEK293 human embryonic kidney cell line, and HeLa human cervical epithelial carcinoma cell line. PVDF membrane was probed with 1 µg/mL of Mouse Anti-Human HTRA2/Omi Monoclonal Antibody (Catalog # MAB1458) followed by HRP-conjugated Anti-Mouse IgG Secondary Antibody (Catalog # HAF007). A specific band was detected for HTRA2/Omi at approximately 35 kDa (as indicated). This experiment was conducted under reducing conditions and using Immunoblot Buffer Group 4.

Immunocytochemistry View Larger

HTRA2/Omi in K562 Human Cell Line. HTRA2/Omi was detected in immersion fixed K562 human chronic myelogenous leukemia cell line using Mouse Anti-Human HTRA2/Omi Monoclonal Antibody (Catalog # MAB1458) at 25 µg/mL for 3 hours at room temperature. Cells were stained using the NorthernLights™ 557-conjugated Anti-Mouse IgG Secondary Antibody (red; NL007) and counterstained with DAPI (blue). Specific staining was localized to cytoplasm. Staining was performed using our protocol for Fluorescent ICC Staining of Non-adherent Cells.

Reconstitution Calculator

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Preparation and Storage

Reconstitute at 0.5 mg/mL in sterile PBS.
Reconstitution Buffer Available
Reconstitution Buffer 1 (PBS)
Catalog #
Size / Price
The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below. *Small pack size (SP) is shipped with polar packs. Upon receipt, store it immediately at -20 to -70 °C
Stability & Storage
Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  • 12 months from date of receipt, -20 to -70 °C as supplied.
  • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
  • 6 months, -20 to -70 °C under sterile conditions after reconstitution.

Background: HTRA2/Omi

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 (R&D Systems, Catalog # 786-XB) inhibition of Caspase-7 (R&D Systems, 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.

  1. Suzuki, Y. et al. (2001) Mol. Cell. 8:613.
  2. van Loo, G. et al. (2002) Cell Death & Diff. 9:20.
  3. Hedge, R. et al. (2001) J. Biol. Chem. 277:432.
  4. Verhagen, A. et al. (2001) J. Biol. Chem. 277:445.
  5. Martins, L. et al. (2002) J. Biol. Chem. 277:439.
  6. Silke, J., and A. Verhagen (2002) Cell Death & Diff. 9:362.
  7. Savopoulos, J. et al. (2000) Protein Expression & Purification 19:227.
Long Name
High Temperature Requirement Protein-2
Entrez Gene IDs
27429 (Human); 64704 (Mouse)
Alternate Names
High temperature requirement protein A2; HtrA serine peptidase 2; HTRA2; HtrA-like serine protease; Omi; OMIOmi stress-regulated endoprotease; PARK13EC; PRSS25; PRSS25serine, 25; Serine protease 25; serine protease HTRA2, mitochondrial; Serine proteinase OMI

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Citations for Human HTRA2/Omi Antibody

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.

2 Citations: Showing 1 - 2
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  1. TNF provokes cardiomyocyte apoptosis and cardiac remodeling through activation of multiple cell death pathways.
    Authors: Haudek SB, Taffet GE, Schneider MD, Mann DL
    J. Clin. Invest., 2007-09-01;117(9):2692-701.
    Species: Mouse
    Sample Types: Cell Culture Supernates
    Applications: Western Blot
  2. Cytosolic factor- and TOM-independent import of C-tail-anchored mitochondrial outer membrane proteins.
    Authors: Setoguchi K, Otera H, Mihara K
    EMBO J., 2006-11-16;25(24):5635-47.
    Species: Human
    Sample Types: Cell Lysates, Whole Cells
    Applications: ICC, Western Blot


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