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  • C268 - Monoclonal Anti-m-Calpain (Domain III/IV) antibody produced in mouse

C268 Sigma-Aldrich

Monoclonal Anti-m-Calpain (Domain III/IV) antibody produced in mouse

clone 107-82, ascites fluid



Related Categories Alphabetical Index, Antibodies, Antibodies for Cell Biology, Antibodies for Intracellular Calcium Signaling, Antibodies to Calcium-Associated Proteins,
conjugate   unconjugated
clone   107-82, monoclonal
biological source   mouse
application(s)   indirect immunofluorescence: 1:50
  western blot: 1:500
species reactivity   pig, rat, bovine, human
mol wt   antigen 80 kDa
shipped in   dry ice
storage temp.   −20°C
antibody form   ascites fluid
isotype   IgG1
Quality Level   200
antibody product type   primary antibodies
UniProt accession no.   P17655
Gene Information   human ... CAPN2(824)
rat ... Capn2(29154)


General description

Calpain-2 catalytic subunit is a protein encoded by the CAPN2 gene in humans. Calpains are calcium dependent proteases constituting a family of proteins that are involved in essential cellular functions mediated by calcium. They share a homologous cysteine-protease domain and an E-F hand Ca2+-binding domain. The calpain system consists of two ubiquitous forms of calpain (m-calpain and μ-calpain), a tissue specific calpain (n-calpain) and a calpain inhibitory protein (calpastatin).


Epitope mapping studies indicate the epitope is between amino acids 502-699 (domain III/IV) of human m-calpain. The antibody reacts specifically with m-calpain. It does not cross-react with μ-calpain, n-calpain, calmodulin or calpastatin. It is not recommended for immunoprecipitation. By immunoblotting, reactivity is observed with human platelets and erythrocytes, bovine platelets, heart and skeletal muscle and with rat myoblasts, kidney, liver and spleen. By immunofluorescence on pig LLC-PK1 cells, diffuse cytoplasmic staining is observed.


m-calpain from bovine skeletal muscle.


Monoclonal Anti-m-Calpain (Domain III/IV) antibody produced in mouse is suitable for indirect immunofluorescence at a dilution of 1:50 and for western blotting at a dilution of 1:500.

Physical form

Solution containing 0.05% sodium azide.


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.

Biochem/physiol Actions

Calpain plays an important role during cellular processes including cytoskeletal remodeling, apoptosis and survival. Calpain-2 over expression is significantly associated with platinum resistant tumours and in ovarian carcinomas may allow prognostic stratification of patients treated with surgery and platinum-based chemotherapy. Its over expression in basal-like or triple-negative disease is associated with adverse breast cancer-specific survival. m-calpain (calpain-2) is significantly associated with triple-negative and basal-like disease.

Safety & Documentation

Safety Information

NONH for all modes of transport
WGK Germany 
Flash Point(F) 
Not applicable
Flash Point(C) 
Not applicable


Certificate of Analysis (COA)

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Certificate of Origin (COO)

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Protocols & Articles


Antibody Basics

Immunoglobulins (Igs) are produced by B lymphocytes and secreted into plasma. The Ig molecule in monomeric form is a glycoprotein with a molecular weight of approximately 150 kDa that is shaped more ...
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Western Blot Protocol | Immunoblotting Protocol

Western Blotting refers to the electrophoretic transfer of proteins from sodium dodecyl sulfate polyacrylamide gels to sheets of PVDF or nitrocellullose membrane, followed by immunodetection of prote...
Keywords: AGE, Buffers, Cell disruption, Detection methods, Detergents, Dialysis, Electroblotting, Electrophoresis, Enzyme activity, Gel electrophoresis, Immunoprecipitation, PAGE, Protein extraction, Purification, Sample preparations, Western blot

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