InterPro : IPR022682

Name  Peptidase C2, calpain, large subunit, domain III Short Name  Calpain_domain_III
Type  Domain Description  Cysteine peptidases have characteristic molecular topologies, which can be seen not only in their three-dimensional structures, but commonly also in the two-dimensional structures. These are peptidases in which the nucleophile is the sulphydryl group of a cysteine residue. Cysteine proteases are divided into clans (proteins which are evolutionary related), and further sub-divided into families, on the basis of the architecture of their catalytic dyad or triad []. This group of cysteine peptidases belong to the MEROPS peptidase family C2 (calpain family, clan CA). A type example is calpain, which is an intracellular protease involved in many important cellular functions that are regulated by calcium []. The protein is a complex of 2polypeptide chains (light and heavy), with three known forms in mammals[, ]: a highly calcium-sensitive (i.e., micro-molar range) form known as mu-calpain, mu-CANP or calpain I; a form sensitive to calcium in the milli-molar range, known as m-calpain, m-CANP or calpain II; and a third form, known as p94, which is found in skeletal muscle only []. All forms have identical light but different heavy chains. Both mu- and m-calpain are heterodimers containing an identical 28kDa subunit and an 80kDa subunit that shares 55-65% sequence homology between the two proteases [, ]. The crystallographic structure of m-calpain reveals six "domains" in the 80kDa subunit: A 19-amino acid NH2-terminal sequence;Active site domain IIa;Active site domain IIb. Domain 2 showslow levels of sequence similarity to papain; although the catalytic His hasnot been located by biochemical means, it is likely that calpain and papainare related [].Domain III;An 18-amino acid extended sequence linking domain III to domain IV;Domain IV, which resembles the penta EF-hand family of polypeptides, binds calcium and regulates activity []. />]. Ca2+-binding causes a rearrangement of the protein backbone, the net effect of which is that a Trp side chain, which acts as a wedge between catalytic domains IIa and IIb in the apo state, moves away from the active site cleft allowing for the proper formation of the catalytic triad []. Calpain-like mRNAs have been identified in other organisms including bacteria, but the molecules encoded by these mRNAs have not been isolated, so little is knownabout their properties. How calpain activity is regulated in these organisms cells is still unclear In metazoans, the activity of calpain is controlled by a single proteinase inhibitor, calpastatin (). The calpastatin gene can produce eight or more calpastatin polypeptides ranging from 17 to 85 kDa by use of different promoters and alternative splicing events. The physiological significance of these different calpastatins is unclear, although all bind to three different places on the calpain molecule; binding to at least two of the sites is Ca2+ dependent. The calpains ostensibly participate in a variety of cellular processes including remodelling of cytoskeletal/membrane attachments, different signal transduction pathways, and apoptosis. Deregulated calpain activity following loss of Ca2+ homeostasis results in tissue damage in response to events such as myocardial infarcts, stroke, and brain trauma []. This entry represents domain III. It is found in association with . The function of the domain III and I are currently unknown. Domain II is a cysteine protease and domain IV is a calcium binding domain. Calpains are believed to participatein intracellular signaling pathways mediated by calcium ions.
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Sequence Features

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Proteins

InterPro protein domain ID --> Contigs

 

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1 Child Features

Id Name Short Name Type
IPR022683 Peptidase C2, calpain, domain III Calpain_III Domain

0 Contains

1 Found In

Id Name Short Name Type
IPR022684 Peptidase C2, calpain family Calpain_cysteine_protease Family

0 Parent Features

6 Publications

First Author Title Year Journal Volume Pages
Barrett AJ Evolutionary lines of cysteine peptidases. 2001 Biol Chem 382 727-33
Rawlings ND Families of cysteine peptidases. 1994 Methods Enzymol 244 461-86
Goll DE The calpain system. 2003 Physiol Rev 83 731-801
Sorimachi H Molecular cloning of a novel mammalian calcium-dependent protease distinct from both m- and mu-types. Specific expression of the mRNA in skeletal muscle. 1989 J Biol Chem 264 20106-11
Hata A Tandemly reiterated negative enhancer-like elements regulate transcription of a human gene for the large subunit of calcium-dependent protease. 1989 J Biol Chem 264 6404-11
Khorchid A How calpain is activated by calcium. 2002 Nat Struct Biol 9 239-41



To cite PlanMine, please refer to the following publication:

Rozanski, A., Moon, H., Brandl, H., Martín-Durán, J. M., Grohme, M., Hüttner, K., Bartscherer, K., Henry, I., & Rink, J. C.
PlanMine 3.0—improvements to a mineable resource of flatworm biology and biodiversity
Nucleic Acids Research, gky1070. doi:10.1093/nar/gky1070 (2018)