Technical Data
Peroxiredoxin (Prx) is an antioxidant enzyme detoxifying reactive oxygen species and has a cysteine at their active site. Prx enzymes modulate various receptor signaling pathways and protect cells from oxidatively induced death. Prx I to IV have two conserved Cys residues corresponding to Cys51 and Cys172 of mammalian Prx I. The active site cysteine (Cys51) is oxidized to cysteine sulfenic acid (Cys51-SOH) when a peroxide is reduced. Because Cys51-SOH is unstable, it forms a disulfide with Cys172-SH which comes from other subunit of the homodimer. The disulfide is then reduced back to the Prx active thiol form by the thioredoxin-thioredoxin reductase system. However, the formation of the disulfide is a slow process. Thus under oxidative stress condition, the sulfenic intermediate (Cys51-SOH) can be easily overoxidized to cysteine sulfinic acid (Cys-SO2H) or cysteine sulfonic acid (Cys-SO3H) before it is able to form a disulfide. Recent studies suggest that overoxidized Prx can be reduced back to the active form during recovery after oxidative stress. Anti-Prx-SO3 antibody recognizes both sulfinic and sulfonic forms of Prx and detects overoxidized Prx enzymes in H2O2-treated cells with high sensitivity and specificity. Involved in redox regulation of the cell. Reduces peroxides with reducing equivalents provided through the thioredoxin system but not from glutaredoxin. May play an important role in eliminating peroxides generated during metabolism. Might participate in the signaling cascades of growth factors and tumor necrosis factor-alpha by regulating the intracellular concentrations of H2O2. Reduces an intramolecular disulfide bond in GDPD5 that gates the ability to GDPD5 to drive postmitotic motor neuron differentiation.

Suitable for use in Western Blot. Other applications not tested.

Recommended Dilutions:
Western Blot: 1:1000-1:2000
Optimal dilutions to be determined by the researcher.

Positive Control:
HeLa cell treated with H2O2

Storage and Stability:
May be stored at 4C for short-term only. Aliquot to avoid repeated freezing and thawing. Store at -20C. Aliquots are stable for 12 months after receipt. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap.
100ul-20CBlue IceHumanRabbit
Not Determined
Sulfonylated peptide corresponding to the active site sequence common to Human Prx I to IV, conjugated to KLH. Cellular Localization: Cytoplasm melanosome
Supplied as a liquid in HEPES, 0.15M sodium chloride, 0.01% BSA, 0.03% sodium azide, 50% glycerol.
Recognizes human Peroxiredoxin-SO3.
Intended for research use only. Not for use in human, therapeutic, or diagnostic applications.
1. Woo H.A., et al. (2003) J. Biol. Chem. 278(48):47361-47364. 2. Woo H.A., et al. (2003) Science, 300:653-656. 3. Chevallet M., et al. (2003) J. Biol. Chem.278(39): 37146-37153. 4. Angelika Tolle, et al.(2005) Free Radic Biol Med.38:1401-1408. 5. James W. Baty, et al.(2005) Biochem. J 3 Mar published. 6. Min Hee Choi et al. (2005) Nature letters 435(19): 347-353.