Annotations: 1ISK

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1iska_	Alpha and beta proteins (a+b)	Cystatin-like	NTF2-like	Ketosteroid isomerase-like	Delta-5-3-ketosteroid isomerase, steroid delta-isomerase, KSI	(Comamonas testosteroni ) [TaxId: 285 ],	SCOPe (2.08)
B	d1iskb_	Alpha and beta proteins (a+b)	Cystatin-like	NTF2-like	Ketosteroid isomerase-like	Delta-5-3-ketosteroid isomerase, steroid delta-isomerase, KSI	(Comamonas testosteroni ) [TaxId: 285 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2 Family	Ketosteroid isomerase-like	8022306	4001023	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	NTF2-like	8034686	3000472	SCOP2 (2022-06-29)
B	SCOP2B Superfamily	NTF2-like	8034686	3000472	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	SnoaL_1	e1iskA1	A: a+b two layers	X: Cystatin-like	H: NTF2-like (From Topology)	T: NTF2-like	F: SnoaL_1	ECOD (1.6)
B	SnoaL_1	e1iskB1	A: a+b two layers	X: Cystatin-like	H: NTF2-like (From Topology)	T: NTF2-like	F: SnoaL_1	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.10.450.50	Alpha Beta	Roll	Nuclear Transport Factor 2	Chain: A,	CATH (4.3.0)
B	3.10.450.50	Alpha Beta	Roll	Nuclear Transport Factor 2	Chain: A,	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF02136	Nuclear transport factor 2 (NTF2) domain (NTF2)	Nuclear transport factor 2 (NTF2) domain	This family includes the NTF2-like Delta-5-3-ketosteroid isomerase proteins.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	3-OXO-DELTA5-STEROID ISOMERASE	isomerase activity intramolecular oxidoreductase activity, transposing C=C bonds steroid delta-isomerase activity intramolecular oxidoreductase activity catalytic activity	organic cyclic compound metabolic process organic substance metabolic process steroid metabolic process metabolic process primary metabolic process lipid metabolic process	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR032710	NTF2-like domain superfamily	Homologous Superfamily
A, B	IPR039256	Ketosteroid isomerase	Family
A, B	IPR011944	Steroid delta5-4-isomerase	Family
A, B	IPR002075	Nuclear transport factor 2 domain	Domain

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.