Annotations: 6Z01

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
B	Topoisom_I_N_C	e6z01B1	A: beta complex topology	X: Beta-strand domain in eukaryotic DNA topoisomerase I, N-terminal DNA-binding fragment (From Topology)	H: Beta-strand domain in eukaryotic DNA topoisomerase I, N-terminal DNA-binding fragment (From Topology)	T: Beta-strand domain in eukaryotic DNA topoisomerase I, N-terminal DNA-binding fragment	F: Topoisom_I_N_C	ECOD (1.6)
B	Topoisom_I_N	e6z01B5	A: alpha arrays	X: HTH	H: HTH	T: DNA breaking-rejoining enzymes	F: Topoisom_I_N	ECOD (1.6)
B	Topo_C_assoc	e6z01B4	A: alpha arrays	X: HTH	H: HTH	T: DNA breaking-rejoining enzymes	F: Topo_C_assoc	ECOD (1.6)
B	Topoisom_I_N_N	e6z01B2	A: alpha arrays	X: Alpha-helical domain in eukaryotic DNA topoisomerase I, N-terminal DNA-binding fragment (From Topology)	H: Alpha-helical domain in eukaryotic DNA topoisomerase I, N-terminal DNA-binding fragment (From Topology)	T: Alpha-helical domain in eukaryotic DNA topoisomerase I, N-terminal DNA-binding fragment	F: Topoisom_I_N_N	ECOD (1.6)
B	F_UNCLASSIFIED	e6z01B3	A: alpha bundles	X: Long alpha-hairpin	H: Eukaryotic DNA topoisomerase I, dispensable insert domain (From Topology)	T: Eukaryotic DNA topoisomerase I, dispensable insert domain	F: F_UNCLASSIFIED	ECOD (1.6)
A	Topoisom_I_N_C	e6z01A3	A: beta complex topology	X: Beta-strand domain in eukaryotic DNA topoisomerase I, N-terminal DNA-binding fragment (From Topology)	H: Beta-strand domain in eukaryotic DNA topoisomerase I, N-terminal DNA-binding fragment (From Topology)	T: Beta-strand domain in eukaryotic DNA topoisomerase I, N-terminal DNA-binding fragment	F: Topoisom_I_N_C	ECOD (1.6)
A	Topoisom_I_N	e6z01A2	A: alpha arrays	X: HTH	H: HTH	T: DNA breaking-rejoining enzymes	F: Topoisom_I_N	ECOD (1.6)
A	Topo_C_assoc	e6z01A5	A: alpha arrays	X: HTH	H: HTH	T: DNA breaking-rejoining enzymes	F: Topo_C_assoc	ECOD (1.6)
A	Topoisom_I_N_N	e6z01A4	A: alpha arrays	X: Alpha-helical domain in eukaryotic DNA topoisomerase I, N-terminal DNA-binding fragment (From Topology)	H: Alpha-helical domain in eukaryotic DNA topoisomerase I, N-terminal DNA-binding fragment (From Topology)	T: Alpha-helical domain in eukaryotic DNA topoisomerase I, N-terminal DNA-binding fragment	F: Topoisom_I_N_N	ECOD (1.6)
A	F_UNCLASSIFIED	e6z01A1	A: alpha bundles	X: Long alpha-hairpin	H: Eukaryotic DNA topoisomerase I, dispensable insert domain (From Topology)	T: Eukaryotic DNA topoisomerase I, dispensable insert domain	F: F_UNCLASSIFIED	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
B	1.10.10.41	Mainly Alpha	Orthogonal Bundle	Arc Repressor Mutant, subunit A	Yeast DNA topoisomerase - domain 1	CATH (utative)
B	3.90.15.10	Alpha Beta	Alpha-Beta Complex	Topoisomerase I	Chain A, domain 3	CATH (utative)
B	1.10.132.10	Mainly Alpha	Orthogonal Bundle	Topoisomerase I	Chain A, domain 4	CATH (utative)
A	1.10.10.41	Mainly Alpha	Orthogonal Bundle	Arc Repressor Mutant, subunit A	Yeast DNA topoisomerase - domain 1	CATH (utative)
A	3.90.15.10	Alpha Beta	Alpha-Beta Complex	Topoisomerase I	Chain A, domain 3	CATH (utative)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF14370	C-terminal topoisomerase domain (Topo_C_assoc)	C-terminal topoisomerase domain	-	Family
A, B	PF01028	Eukaryotic DNA topoisomerase I, catalytic core (Topoisom_I)	Eukaryotic DNA topoisomerase I, catalytic core	Topoisomerase I promotes the relaxation of DNA superhelical tension by introducing a transient single-stranded break in duplex DNA and are vital for the processes of replication, transcription, and recombination [2].	Domain

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 nucleic acid binding nucleic acid conformation isomerase activity 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 macromolecular conformation isomerase activity	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 organelle organization cellular process metabolic process cellular component organization or biogenesis macromolecule metabolic process	intracellular organelle cellular anatomical structure intracellular anatomical structure organelle membraneless organelle intracellular membraneless organelle chromosome

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR011010	DNA breaking-rejoining enzyme, catalytic core	Homologous Superfamily
A, B	IPR001631	DNA topoisomerase I	Family
A, B	IPR008336	DNA topoisomerase I, DNA binding, eukaryotic-type	Domain
A, B	IPR014711	DNA topoisomerase I, catalytic core, alpha-helical subdomain, eukaryotic-type	Homologous Superfamily
A, B	IPR013030	DNA topoisomerase I, DNA binding, N-terminal domain 2	Homologous Superfamily
A, B	IPR013499	DNA topoisomerase I, eukaryotic-type	Domain
A, B	IPR051062	DNA topoisomerase IB	Family
A, B	IPR036202	DNA topoisomerase I, DNA binding, eukaryotic-type, N-terminal domain superfamily	Homologous Superfamily
A, B	IPR013500	DNA topoisomerase I, catalytic core, eukaryotic-type	Domain
A, B	IPR025834	Topoisomerase I C-terminal domain	Domain
A, B	IPR013034	DNA topoisomerase I, DNA binding, N-terminal domain 1	Homologous Superfamily
A, B	IPR014727	DNA topoisomerase I, catalytic core, alpha/beta subdomain	Homologous Superfamily

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.