Annotations: 1NX1

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
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)
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)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
B	SCOP2B Superfamily	EF-hand	8037390	3001983	SCOP2B (2022-06-29)
A	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)
B		e1nx1B1	A: UBC-like	X: UBC-like	H: Concanavalin A-like lectins/glucanases	T: EF-hand_1, EF-hand_7	F:	ECOD (20:10:01)
A		e1nx1A1	A: UBC-like	X: UBC-like	H: Concanavalin A-like lectins/glucanases	T: EF-hand_1, EF-hand_7	F:	ECOD (20:10:01)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
B	1.10.238.10	Mainly Alpha	Orthogonal Bundle	Recoverin	domain 1	CATH (4.3.0)
A	1.10.238.10	Mainly Alpha	Orthogonal Bundle	Recoverin	domain 1	CATH (4.3.0)

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	proteolysis metabolic process cellular process primary metabolic process protein metabolic process macromolecule metabolic process	cell periphery cellular anatomical structure plasma membrane membrane 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	catabolic process metabolic process cellular process primary metabolic process protein catabolic process protein metabolic process macromolecule metabolic process macromolecule catabolic process	cellular anatomical structure intracellular anatomical structure cytoplasm

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 U.S. National Science Foundation (DBI-2321666), 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 R01GM157729. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.