Annotations: 1CYY

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1cyya_	Multi-domain proteins (alpha and beta)	Prokaryotic type I DNA topoisomerase	Prokaryotic type I DNA topoisomerase	Prokaryotic type I DNA topoisomerase	DNA topoisomerase I, 67K N-terminal domain	(Escherichia coli K-12 ) [TaxId: 83333 ],	SCOPe (2.08)
B	d1cyyb_	Multi-domain proteins (alpha and beta)	Prokaryotic type I DNA topoisomerase	Prokaryotic type I DNA topoisomerase	Prokaryotic type I DNA topoisomerase	DNA topoisomerase I, 67K N-terminal domain	(Escherichia coli K-12 ) [TaxId: 83333 ],	SCOPe (2.08)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	F_UNCLASSIFIED	e1cyyA1	A: beta barrels	X: LigT-like	H: Prokaryotic type I DNA topoisomerase beta-barrel domain (From Topology)	T: Prokaryotic type I DNA topoisomerase beta-barrel domain	F: F_UNCLASSIFIED	ECOD (1.6)
A	PF01131	e1cyyA2	A: alpha arrays	X: HTH	H: HTH	T: winged	F: PF01131	ECOD (1.6)
B	F_UNCLASSIFIED	e1cyyB1	A: beta barrels	X: LigT-like	H: Prokaryotic type I DNA topoisomerase beta-barrel domain (From Topology)	T: Prokaryotic type I DNA topoisomerase beta-barrel domain	F: F_UNCLASSIFIED	ECOD (1.6)
B	PF01131	e1cyyB2	A: alpha arrays	X: HTH	H: HTH	T: winged	F: PF01131	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	1.10.290.10	Mainly Alpha	Orthogonal Bundle	Topoisomerase I	domain 4	CATH (4.3.0)
A	2.70.20.10	Mainly Beta	Distorted Sandwich	Topoisomerase I	domain 3	CATH (4.3.0)
B	1.10.290.10	Mainly Alpha	Orthogonal Bundle	Topoisomerase I	domain 4	CATH (4.3.0)
B	2.70.20.10	Mainly Beta	Distorted Sandwich	Topoisomerase I	domain 3	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF01131	DNA topoisomerase (Topoisom_bac)	DNA topoisomerase	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	DNA TOPOISOMERASE I	DNA binding binding organic cyclic compound binding nucleic acid binding isomerase activity DNA topoisomerase type I (single strand cut, ATP-independent) activity catalytic activity, acting on DNA DNA topoisomerase activity catalytic activity, acting on a nucleic acid catalytic activity cation binding ion binding metal ion binding small molecule binding	chromosome organization primary metabolic process DNA conformation change DNA metabolic process nucleic acid metabolic process cellular component organization nucleobase-containing compound metabolic process DNA topological change organic cyclic compound metabolic process organelle organization organic substance metabolic process cellular process metabolic process cellular component organization or biogenesis chromosome organization primary metabolic process DNA conformation change DNA metabolic process nucleic acid metabolic process cellular component organization nucleobase-containing compound metabolic process DNA topological change organic cyclic compound metabolic process organelle organization organic substance metabolic process cellular process metabolic process cellular component organization or biogenesis macromolecule metabolic process	intracellular organelle intracellular anatomical structure organelle intracellular non-membrane-bounded organelle chromosome cellular anatomical entity non-membrane-bounded organelle cytoplasm cytosol

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR013498	DNA topoisomerase, type IA, zn finger	Domain
A, B	IPR013497	DNA topoisomerase, type IA, central	Domain
A, B	IPR003602	DNA topoisomerase, type IA, DNA-binding domain	Domain
A, B	IPR049330	Topoisomerase I, zinc finger	Domain
A, B	IPR013263	DNA topoisomerase I, zinc ribbon-like, bacterial-type	Domain
A, B	IPR023405	DNA topoisomerase, type IA, core domain	Homologous Superfamily
A, B	IPR013825	DNA topoisomerase, type IA, central region, subdomain 2	Homologous Superfamily
A, B	IPR003601	DNA topoisomerase, type IA, domain 2	Domain
A, B	IPR028612	DNA topoisomerase I, type IA	Family
A, B	IPR000380	DNA topoisomerase, type IA	Family
A, B	IPR013826	DNA topoisomerase, type IA, central region, subdomain 3	Homologous Superfamily
A, B	IPR006171	TOPRIM domain	Domain
A, B	IPR023406	DNA topoisomerase, type IA, active site	Active Site
A, B	IPR005733	DNA topoisomerase I, bacterial-type	Family
A, B	IPR034149	DNA topoisomerase 1, TOPRIM domain	Domain
A, B	IPR013824	DNA topoisomerase, type IA, central region, subdomain 1	Homologous Superfamily

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.