C6108 Sigma-Aldrich

Calpain 1 human

aqueous glycerol solution

Synonym: Calcium-activated neutral protease 1




Human calpain 1 has been used in a study to assess how the crystal structures of human calpains 1 and 9 imply diverse mechanisms of action and auto-inhibition. Human calpain 1 has also been used in a study to investigate the synthesis, biological evaluation and molecular modelling of N-heterocyclic dipeptide aldehydes as selective calpain inhibitors.

Biochem/physiol Actions

Caplain 1 is a neutral calcium-dependent cysteine protease containing the EF-hand motif. The protease consists of two subunits; the larger subunit has four domains that are homologous with papain and calmodulin. The smaller subunit has one domain that shares homology with calmodulin. It is activated by micromolar levels of calcium and hence, it is also called as micro-calpain. Its activation leads to cellular protein degradation, neuronal cell degeneration, and autoimmune demyelinating diseases such as multiple sclerosis.

Cytosolic protease with involvement in cytoskeletal remodeling, autophagy, and apoptosis as an upstream regulator.

Physical properties

Calpain 1 is a heterodimeric calcium-activated thiol-protease.

Physical form

Solution in 20 mM Imidazole-HCl, 5 mM β-Mercaptoethanol, 1 mM EDTA, 1 mM EGTA, and 30% glycerol.

Safety & Documentation

Safety Information

NONH for all modes of transport
WGK Germany 


Certificate of Analysis (COA)

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Certificate of Origin (COO)

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Protocols & Articles


Huntington's Disease

Huntington's disease (HD) is an autosomal dominant, late-onset neurodegenerative disorder characterized by a selective neuronal cell death in the cortex and striatum leading to cognitive dysfunction,...
Carolyn L. Crankshaw
BioFiles v7 n2, 2011, 9–14
Keywords: Apoptosis, Huntington Disease, Transcription

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Application Index | Enzyme Index | Substrate Index | Inhibitor Index | Cofactor Index | Lectin Index
Keywords: Cell signaling, Diagnostic, Drug discovery, Metabolomics, Molecular biology

Peer-Reviewed Papers


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A6060 Calpain Inhibitor II, powder

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