The application notes include recommended starting dilutions; optimal dilutions/concentrations should be determined by the end user.
1/500 - 1/5000. Detects a band of approximately 37 kDa (predicted molecular weight: 49 kDa).
1/100 - 1/250. Perform heat mediated antigen retrieval before commencing with IHC staining protocol.
1/250 - 1/500.
1/70. ab172730-Rabbit monoclonal IgG, is suitable for use as an isotype control with this antibody.
FunctionSerine protease that shows proteolytic activity against a non-specific substrate beta-casein. Promotes or induces cell death either by direct binding to and inhibition of BIRC proteins (also called inhibitor of apoptosis proteins, IAPs), leading to an increase in caspase activity, or by a BIRC inhibition-independent, caspase-independent and serine protease activity-dependent mechanism. Cleaves THAP5 and promotes its degradation during apoptosis. Isoform 2 seems to be proteolytically inactive.
Tissue specificityIsoform 1 is ubiquitous. Isoform 2 is expressed predominantly in the kidney, colon and thyroid.
Involvement in diseaseDefects in HTRA2 are the cause of Parkinson disease type 13 (PARK13) [MIM:610297]. A complex neurodegenerative disorder characterized by bradykinesia, resting tremor, muscular rigidity and postural instability, as well as by a clinically significant response to treatment with levodopa. The pathology involves the loss of dopaminergic neurons in the substantia nigra and the presence of Lewy bodies (intraneuronal accumulations of aggregated proteins), in surviving neurons in various areas of the brain.
Sequence similaritiesBelongs to the peptidase S1B family. Contains 1 PDZ (DHR) domain.
DomainThe mature N-terminus is involved in the interaction with XIAP. The PDZ domain mediates interaction with MXI2.
Cellular localizationMitochondrion intermembrane space. Mitochondrion membrane. Predominantly present in the intermembrane space. Released into the cytosol following apoptotic stimuli, such as UV treatment, and stimulation of mitochondria with caspase-8 truncated BID/tBID.
Flow Cytometry - Anti-HtrA2 / Omi antibody [EPR22] (ab75982)
Overlay histogram showing HeLa cells stained with ab75982 (red line). The cells were fixed with 80% methanol (5 min) and then permeabilized with 0.1% PBS-Tween for 20 min. The cells were then incubated in 1x PBS / 10% normal goat serum / 0.3M glycine to block non-specific protein-protein interactions followed by the antibody (ab75982, 1/100 dilution) for 30 min at 22°C. The secondary antibody used was goat anti-rabbit Alexa Fluor® 488 (IgG H+L) (ab150077) at 1/2000 dilution for 30 min at 22°C. Isotype control antibody (black line) was rabbit IgG (monoclonal) (1μg/1x106 cells) used under the same conditions. Unlabelled sample (blue line) was also used as a control. Acquisition of >5,000 events were collected using a 20mW Argon ion laser (488nm) and 525/30 bandpass filter.
References for Anti-HtrA2 / Omi antibody [EPR22] (ab75982)
This product has been referenced in:
Rami A et al. Translocation of the serine protease Omi/HtrA2 from mitochondria into the cytosol upon seizure-induced hippocampal injury in the neonatal rat brain. Neurochem Res35:2199-207 (2010).
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