Annotations: 1NX1

Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1nx1a_	All alpha proteins	EF Hand-like	EF-hand	Penta-EF-hand proteins	Calpain small (regulatory) subunit (domain VI)	pig (Sus scrofa ) [TaxId: 9823 ],	SCOPe (2.08)
B	d1nx1b_	All alpha proteins	EF Hand-like	EF-hand	Penta-EF-hand proteins	Calpain small (regulatory) subunit (domain VI)	pig (Sus scrofa ) [TaxId: 9823 ],	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	8037390	3001983	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	EF-hand	8037390	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	F_UNCLASSIFIED	e1nx1A2	A: alpha arrays	X: EF-hand	H: EF-hand-related	T: EF-hand	F: F_UNCLASSIFIED	ECOD (1.6)
B	F_UNCLASSIFIED	e1nx1B2	A: alpha arrays	X: EF-hand	H: EF-hand-related	T: EF-hand	F: F_UNCLASSIFIED	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
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
C, D	PF00748	Calpain inhibitor (Calpain_inhib)	Calpain inhibitor	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	Calcium-dependent protease, small subunit	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	organic substance metabolic process organonitrogen compound metabolic process proteolysis metabolic process primary metabolic process protein metabolic process macromolecule metabolic process	cell periphery plasma membrane membrane cellular anatomical entity intracellular anatomical structure cytoplasm protein-containing complex catalytic complex caspase complex peptidase complex calpain complex endopeptidase complex
C, D	Calpastatin	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	organonitrogen compound catabolic process organonitrogen compound metabolic process catabolic process primary metabolic process protein catabolic process macromolecule catabolic process organic substance metabolic process metabolic process protein metabolic process macromolecule metabolic process organic substance catabolic process	intracellular anatomical structure cytoplasm cellular anatomical entity

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR018247	EF-Hand 1, calcium-binding site	Binding Site
A, B	IPR002048	EF-hand domain	Domain
A, B	IPR011992	EF-hand domain pair	Homologous Superfamily
C, D	IPR026998	Calpastatin	Family
C, D	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.