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Anti-Proteinase 3/PR3 Antibody, clone MCPR3-7 is an antibody against PR3 for use in Affinity Binding Assay, Flow Cytometry, Immunoprecipitation, Inhibition Assay, and Western Blotting.
More>>Anti-Proteinase 3/PR3 Antibody, clone MCPR3-7 is an antibody against PR3 for use in Affinity Binding Assay, Flow Cytometry, Immunoprecipitation, Inhibition Assay, and Western Blotting. Less<<
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Myeloblastin (EC 3.4.21.76; UniProt P24158; also known as AGP7, C-ANCA antigen, Leukocyte proteinase 3, Neutrophil proteinase 4, NP-4, P29, PR-3, PR3, Wegener autoantigen) is encoded by the PRTN3 (also known as CANCA, MBN, NP4) gene (Gene ID 5657) in human. Proteinase 3 (PR3) is one of four neutral serine proteases (elastase, cathepsin G, PR3, and neutrophil serine protease 4) stored as fully processed mature enzymes in azurophil granules of human neutrophils. Instead of being targeted to granules after their synthesis, some PR3 molecules end up on the surface of neutrophil plasma membrane in either pro- or mature form. The degree of such surface expression is genetically determined, but the surface exposure and pericellular activity of PR3 around neutrophils can be further upregulated upon neutrophil priming and activation. PR3 autoantibody (anti-neutrophil cytoplasmic antibodies or ANCA) is the main pathogenic feature in patients suffering from granulomatosis with polyangiitis (GPA; formerly called Wegener granulomatosis). ANCAs are shown to activate cytokine-primed neutrophils in vitro by cross-linking surface-exposed PR3 and Fcγ receptors. PR3 activity and/or its inactivation by alpha 1-antitrypsin/alpha-1 proteinase inhibitor (α1PI) varies in the human population and contributes to the risk for GPA manifestations either at onset, during relapses, or during systemic progression. PR3 is initially produced with a signal peptide sequence (a.a. 1-25), an N-terminal and a C-terminal propeptide sequence (a.a. 26-27 and 249-256, respectively), the removal of which yields the mature enzyme (a.a. 28-248).
References
Product Information
Format
Purified
Presentation
Purified mouse monoclonal IgG1κ antibody in PBS without preservatives.
Anti-Proteinase 3/PR3 Antibody, clone MCPR3-7 is an antibody against PR3 for use in Affinity Binding Assay, Flow Cytometry, Immunoprecipitation, Inhibition Assay, and Western Blotting.
Key Applications
Western Blotting
Affinity Binding Assay
Flow Cytometry
Immunoprecipitation
Inhibits Activity/Function
Application Notes
Western Blotting Analysis: 1-2 µg/mL from a representative lot detected 1 µg of recombinant human pro-PR3 under non-reducing condition, but not under reducing condition (Courtesy of Amber Hummel, Mayo Clinic, Rochester, MN). Flow Cytometry Analysis: A representative lot immunostained the surface of only a small subpopulation of human peripheral blood neutrophils that are stained positive with clone MCPR3-2 (Cat. No. MABT340), consistent with the surface PR3 being in an active conformation complexed with CD177 and/or lipid bilayers. (Hinkofer, L.C., et al. (2013). J. Biol. Chem. 288(37):26635-26648). Flow Cytometry Analysis: A representative lot bound recombinant human PR3-, but not murine PR3-, coated Talon-beads as determined by FACS analysis. (Silva, F., et al. (2010). J. Autoimmun. 35(4) 299-308). Flow Cytometry Analysis: A representative lot bound immobilized recombinant human PR3 via a distinct epitope than those recognized by clone MCPR3-2 and MCPR3-3 (Cat. No. MABT340 and MABF973, respectively) as determined by FACS analysis of bead-based competition binding assay (Silva, F., et al. (2010). J. Autoimmun. 35(4) 299-308). Immunoprecipitation Analysis: A representative lot immunoprecipitated a recombinant human PR3 construct proP-PR3ctp that adopts a pro-PR3 conformation, while exhibiting greater than 75% reduced affinity toward a recombinant construct ΔPR3ctp-S195A that adopts a mature PR3 conformation (Hinkofer, L.C., et al. (2013). J. Biol. Chem. 288(37):26635-26648). Inhibition Analysis: A representative lot caused a substrate-dependent inhibition against human PR3 enzymatic activity by altering PR3 S1' pocket conformation, but not PR3 S1 pocket conformation (Hinkofer, L.C., et al. (2013). J. Biol. Chem. 288(37):26635-26648). Affinity Binding Assay: A representative lot captured a recombinant human PR3 construct proP-PR3ctp that adopts a pro-PR3 conformation, while exhibiting greater than 75% reduced affinity toward a recombinant construct ΔPR3ctp-S195A that adopts a mature PR3 conformation (Hinkofer, L.C., et al. (2013). J. Biol. Chem. 288(37):26635-26648).
Biological Information
Immunogen
Recombinant proP-PR3ctp (Hinkofer, L.C., et al. (2013). J. Biol. Chem. 288(37):26635-26648).
Epitope
A hydrophobic region of the activation domain (Hinkofer, L.C., et al. (2013). J. Biol. Chem. 288(37):26635-26648; Silva, F., et al. (2010). J. Autoimmun. 35(4) 299-308).
Clone
MCPR3-7
Concentration
Please refer to lot specific datasheet.
Host
Mouse
Specificity
Clone MCPR3-7 targets a hydrophobic region of the activation domain involved in the binding of human PR3 to neutrophil membrane receptor NB1/CD177. Clone MCPR3-7 preferentially recognizes PR3 in a pro-form conformation and causes a substrate-dependent inhibition against human PR3 enzymatic activity by altering PR3 S1' pocket conformation, but not PR3 S1 pocket conformation (Hinkofer, L.C., et al. (2013). J. Biol. Chem. 288(37):26635-26648).
Isotyping Analysis: The identity of this monoclonal antibody is confirmed by isotyping test to be IgG1κ.
Usage Statement
Unless otherwise stated in our catalog or other company documentation accompanying the product(s), our products are intended for research use only and are not to be used for any other purpose, which includes but is not limited to, unauthorized commercial uses, in vitro diagnostic uses, ex vivo or in vivo therapeutic uses or any type of consumption or application to humans or animals.
Storage and Shipping Information
Storage Conditions
Stable for 1 year at -20°C from date of receipt. Handling Recommendations: Upon receipt and prior to removing the cap, centrifuge the vial and gently mix the solution. Aliquot into microcentrifuge tubes and store at -20°C. Avoid repeated freeze/thaw cycles, which may damage IgG and affect product performance.
