Annotations: 3BOW

Domain Annotation: SCOP/SCOPe Classification SCOP Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
B	d3bowb_	All alpha proteins	EF Hand-like	EF-hand	Penta-EF-hand proteins	Calpain small (regulatory) subunit (domain VI)	brown rat,rat,rats (Rattus norvegicus ) [TaxId: 10116 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	EF-hand	8037394	3001983	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	Cysteine proteinases	8032820	3001808	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	Calpain large subunit middle domain (domain III)	8041118	3001233	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	EF-hand	8036873	3001983	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	Calpain_III	e3bowA7	A: beta sandwiches	X: jelly-roll	H: Concanavalin A-like	T: Galactose-binding domain-like	F: Calpain_III	ECOD (1.6)
A	EF-hand_8	e3bowA6	A: alpha arrays	X: EF-hand	H: EF-hand-related	T: EF-hand	F: EF-hand_8	ECOD (1.6)
A	EF-hand_7_2	e3bowA5	A: alpha arrays	X: EF-hand	H: EF-hand-related	T: EF-hand	F: EF-hand_7_2	ECOD (1.6)
A	Peptidase_C2	e3bowA1	A: a+b complex topology	X: Cysteine proteinases-like	H: Cysteine proteinases (From Topology)	T: Cysteine proteinases	F: Peptidase_C2	ECOD (1.6)
B	EF-hand_8	e3bowB2	A: alpha arrays	X: EF-hand	H: EF-hand-related	T: EF-hand	F: EF-hand_8	ECOD (1.6)
B	EF-hand_7_2	e3bowB1	A: alpha arrays	X: EF-hand	H: EF-hand-related	T: EF-hand	F: EF-hand_7_2	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.90.70.10	Alpha Beta	Alpha-Beta Complex	Cathepsin B	Chain A	CATH (4.3.0)
A	2.60.120.380	Mainly Beta	Sandwich	Jelly Rolls		CATH (4.3.0)
A	1.10.238.10	Mainly Alpha	Orthogonal Bundle	Recoverin	domain 1	CATH (4.3.0)
B	1.10.238.10	Mainly Alpha	Orthogonal Bundle	Recoverin	domain 1	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF13833	EF-hand domain pair (EF-hand_8)	EF-hand domain pair	-	Domain
A	PF00648	Calpain family cysteine protease (Peptidase_C2)	Calpain family cysteine protease	-	Family
A	PF01067	Calpain large subunit, domain III (Calpain_III)	Calpain large subunit, domain III	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 participate in intracellular signaling pathways mediated by calcium ions.	Domain
B	PF13833	EF-hand domain pair (EF-hand_8)	EF-hand domain pair	-	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	Calpain-2 catalytic subunit	cysteine-type peptidase activity peptidase activity calcium-dependent cysteine-type endopeptidase activity catalytic activity, acting on a protein cysteine-type endopeptidase activity hydrolase activity catalytic activity endopeptidase activity cytoskeletal protein binding protein binding binding protein-containing complex binding cation binding ion binding cysteine-type peptidase activity peptidase activity calcium-dependent cysteine-type endopeptidase activity catalytic activity, acting on a protein cysteine-type endopeptidase activity hydrolase activity catalytic activity endopeptidase activity cytoskeletal protein binding protein binding binding protein-containing complex binding cation binding ion binding calcium ion binding metal ion binding small molecule binding enzyme binding	organonitrogen compound metabolic process cellular biosynthetic process cellular metabolic process primary metabolic process gene expression macromolecule biosynthetic process protein maturation organic substance metabolic process protein autoprocessing biosynthetic process proteolysis organic substance biosynthetic process protein processing nitrogen compound metabolic process organonitrogen compound metabolic process cellular biosynthetic process cellular metabolic process primary metabolic process gene expression macromolecule biosynthetic process protein maturation organic substance metabolic process protein autoprocessing biosynthetic process proteolysis organic substance biosynthetic process protein processing nitrogen compound metabolic process metabolic process cellular process protein metabolic process macromolecule metabolic process organonitrogen compound catabolic process catabolic process protein catabolic process macromolecule catabolic process organic substance catabolic process proteolysis involved in protein catabolic process cellular response to stimulus response to interferon-beta response to organic substance response to stimulus response to cytokine cellular response to interferon-beta cellular response to chemical stimulus response to chemical cellular response to cytokine stimulus cellular response to organic substance behavior multicellular organismal process response to stress multicellular organismal response to stress response to pain behavioral response to pain cellular response to acid chemical cellular response to amino acid stimulus response to acid chemical response to amino acid developmental process cellular developmental process myoblast fusion cell-cell fusion muscle cell differentiation myotube differentiation muscle structure development syncytium formation by plasma membrane fusion anatomical structure morphogenesis cell differentiation anatomical structure formation involved in morphogenesis anatomical structure development syncytium formation striated muscle cell differentiation response to decreased oxygen levels response to hypoxia response to oxygen levels response to abiotic stimulus positive regulation of cellular component organization regulation of cellular process regulation of cellular component organization regulation of syncytium formation by plasma membrane fusion regulation of developmental process positive regulation of biological process cellular component organization positive regulation of developmental process cellular component organization or biogenesis positive regulation of myoblast fusion positive regulation of cellular process regulation of biological process biological regulation regulation of myoblast fusion positive regulation of syncytium formation by plasma membrane fusion interleukin-6 production regulation of interleukin-6 production regulation of cytokine production cytokine production regulation of multicellular organismal process regulation of biosynthetic process regulation of cellular metabolic process regulation of macromolecule metabolic process regulation of cellular biosynthetic process regulation of gene expression regulation of macromolecule biosynthetic process regulation of metabolic process response to hydrogen peroxide response to oxidative stress response to oxygen-containing compound response to reactive oxygen species response to inorganic substance multi-multicellular organism process reproductive process female pregnancy multi-organism reproductive process biological process involved in interspecies interaction between organisms response to lipid response to other organism cellular response to lipopolysaccharide response to external stimulus cellular response to molecule of bacterial origin response to lipopolysaccharide cellular response to oxygen-containing compound response to biotic stimulus cellular response to biotic stimulus response to bacterium cellular response to lipid response to external biotic stimulus response to molecule of bacterial origin positive regulation of cardiac muscle cell apoptotic process positive regulation of programmed cell death muscle cell apoptotic process positive regulation of striated muscle cell apoptotic process regulation of apoptotic process regulation of cardiac muscle cell apoptotic process regulation of muscle cell apoptotic process regulation of programmed cell death cell death positive regulation of apoptotic process cardiac muscle cell apoptotic process positive regulation of muscle cell apoptotic process regulation of striated muscle cell apoptotic process striated muscle cell apoptotic process apoptotic process programmed cell death regulation of lipid metabolic process organonitrogen compound biosynthetic process positive regulation of phosphate metabolic process regulation of primary metabolic process regulation of nitrogen compound metabolic process positive regulation of metabolic process positive regulation of phosphatidylcholine biosynthetic process regulation of phosphate metabolic process phosphate-containing compound metabolic process positive regulation of lipid metabolic process phosphatidylcholine metabolic process phosphorus metabolic process positive regulation of phosphorus metabolic process phospholipid biosynthetic process regulation of phospholipid biosynthetic process glycerolipid biosynthetic process organophosphate biosynthetic process cellular lipid metabolic process regulation of phosphorus metabolic process glycerolipid metabolic process regulation of phosphatidylcholine biosynthetic process positive regulation of phosphatidylcholine metabolic process glycerophospholipid metabolic process lipid biosynthetic process positive regulation of cellular metabolic process phospholipid metabolic process positive regulation of biosynthetic process glycerophospholipid biosynthetic process regulation of phosphatidylcholine metabolic process positive regulation of phospholipid biosynthetic process regulation of phospholipid metabolic process positive regulation of phospholipid metabolic process positive regulation of lipid biosynthetic process positive regulation of nitrogen compound metabolic process organophosphate metabolic process regulation of lipid biosynthetic process phosphatidylcholine biosynthetic process positive regulation of cellular biosynthetic process lipid metabolic process response to mechanical stimulus multicellular organism development embryo development ending in birth or egg hatching chordate embryonic development embryo development in utero embryonic development blastocyst development	cell projection pseudopodium cellular anatomical entity plasma membrane bounded cell projection cell periphery cell surface membrane plasma membrane external side of plasma membrane side of membrane intracellular anatomical structure cytoplasm cytosol somatodendritic compartment cell projection pseudopodium cellular anatomical entity plasma membrane bounded cell projection cell periphery cell surface membrane plasma membrane external side of plasma membrane side of membrane intracellular anatomical structure cytoplasm cytosol somatodendritic compartment dendrite dendritic tree neuron projection intracellular organelle protein-containing complex protein-DNA complex organelle intracellular non-membrane-bounded organelle chromatin chromosome non-membrane-bounded organelle membrane-bounded organelle intracellular membrane-bounded organelle endomembrane system perinuclear endoplasmic reticulum perinuclear region of cytoplasm endoplasmic reticulum Golgi apparatus catalytic complex caspase complex peptidase complex calpain complex endopeptidase complex cell body neuronal cell body anchoring junction cell junction focal adhesion cell-substrate junction membrane microdomain membrane raft lytic vacuole vacuole lysosome nucleus
B	Calpain small subunit 1	cation binding ion binding binding calcium ion binding metal ion binding small molecule binding cysteine-type peptidase activity peptidase activity calcium-dependent cysteine-type endopeptidase activity catalytic activity, acting on a protein cysteine-type endopeptidase activity hydrolase activity catalytic activity endopeptidase activity cation binding ion binding binding calcium ion binding metal ion binding small molecule binding cysteine-type peptidase activity peptidase activity calcium-dependent cysteine-type endopeptidase activity catalytic activity, acting on a protein cysteine-type endopeptidase activity hydrolase activity catalytic activity endopeptidase activity protein-containing complex binding	organonitrogen compound catabolic process organonitrogen compound metabolic process catabolic process primary metabolic process protein catabolic process macromolecule catabolic process organic substance metabolic process nitrogen compound metabolic process metabolic process protein metabolic process macromolecule metabolic process organic substance catabolic process	intracellular anatomical structure cytoplasm cellular anatomical entity cytosol cell periphery plasma membrane membrane protein-containing complex catalytic complex caspase complex peptidase complex calpain complex endopeptidase complex
C	Calpastatin	protein binding binding enzyme binding protease binding enzyme regulator activity molecular function inhibitor activity peptidase regulator activity molecular function regulator activity enzyme inhibitor activity calcium-dependent cysteine-type endopeptidase inhibitor activity cysteine-type endopeptidase inhibitor activity peptidase inhibitor activity endopeptidase regulator activity endopeptidase inhibitor activity	developmental process multicellular organism development multicellular organismal process hepaticobiliary system development gland development animal organ development anatomical structure development liver development system development muscle structure development cellular developmental process cell differentiation cellular process myoblast differentiation developmental process multicellular organism development multicellular organismal process hepaticobiliary system development gland development animal organ development anatomical structure development liver development system development muscle structure development cellular developmental process cell differentiation cellular process myoblast differentiation regulation of biological process regulation of cellular process regulation of epithelial cell apoptotic process negative regulation of programmed cell death regulation of type B pancreatic cell apoptotic process regulation of apoptotic process biological regulation negative regulation of biological process regulation of programmed cell death cell death epithelial cell apoptotic process type B pancreatic cell apoptotic process negative regulation of type B pancreatic cell apoptotic process negative regulation of apoptotic process negative regulation of epithelial cell apoptotic process negative regulation of cellular process apoptotic process programmed cell death organonitrogen compound catabolic process organonitrogen compound metabolic process catabolic process regulation of protein metabolic process primary metabolic process regulation of macromolecule metabolic process protein catabolic process regulation of catabolic process macromolecule catabolic process regulation of primary metabolic process regulation of nitrogen compound metabolic process organic substance metabolic process nitrogen compound metabolic process metabolic process protein metabolic process macromolecule metabolic process regulation of metabolic process organic substance catabolic process regulation of protein catabolic process myoblast fusion cell-cell fusion muscle cell differentiation myotube differentiation syncytium formation by plasma membrane fusion anatomical structure morphogenesis anatomical structure formation involved in morphogenesis syncytium formation striated muscle cell differentiation animal organ regeneration regeneration sexual reproduction reproductive process fertilization egg activation cell activation single fertilization	membrane cellular anatomical entity intracellular anatomical structure cytoplasm cytosol postsynaptic density postsynapse neuron to neuron synapse postsynaptic specialization organelle synapse cell junction asymmetric synapse

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR022684	Peptidase C2, calpain family	Family
A	IPR038765	Papain-like cysteine peptidase superfamily	Homologous Superfamily
A	IPR002048	EF-hand domain	Domain
A	IPR042736	CAPN2, penta-EF hand, calcium binding motif	Domain
A	IPR018247	EF-Hand 1, calcium-binding site	Binding Site
A	IPR033883	Calpain subdomain III	Domain
A	IPR036213	Calpain large subunit, domain III superfamily	Homologous Superfamily
A	IPR022682	Peptidase C2, calpain, large subunit, domain III	Domain
A	IPR000169	Cysteine peptidase, cysteine active site	Active Site
A	IPR011992	EF-hand domain pair	Homologous Superfamily
A	IPR001300	Peptidase C2, calpain, catalytic domain	Domain
A	IPR022683	Peptidase C2, calpain, domain III	Domain
B	IPR018247	EF-Hand 1, calcium-binding site	Binding Site
B	IPR002048	EF-hand domain	Domain
B	IPR011992	EF-hand domain pair	Homologous Superfamily
C	IPR026998	Calpastatin	Family
C	IPR001259	Proteinase inhibitor I27, calpastatin	Repeat

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM133198.