Annotations: 2F4Q

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	Topoisom_I_C	e2f4qA6	A: alpha arrays	X: HTH	H: HTH	T: DNA breaking-rejoining enzymes	F: Topoisom_I_C	ECOD (1.6)
A	Topoisom_I_N	e2f4qA1	A: alpha arrays	X: HTH	H: HTH	T: DNA breaking-rejoining enzymes	F: Topoisom_I_N	ECOD (1.6)
A	Top1	e2f4qA5	A: a+b two layers	X: DNA topoisomerase I domain (From Topology)	H: DNA topoisomerase I domain (From Topology)	T: DNA topoisomerase I domain	F: Top1	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.30.66.10	Alpha Beta	2-Layer Sandwich	Viral Topoisomerase I	DNA topoisomerase I domain	CATH (4.3.0)
A	1.10.132.120	Mainly Alpha	Orthogonal Bundle	Topoisomerase I	Chain A, domain 4	CATH (4.3.0)
A	3.90.15.10	Alpha Beta	Alpha-Beta Complex	Topoisomerase I	Chain A, domain 3	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	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
A	PF21338	Bacterial DNA topoisomerase IB, N-terminal domain (Top1B_N_bact)	Bacterial DNA topoisomerase IB, N-terminal domain	This domain is found at the N-terminal end of Type I topoisomerase from Deinococcus radiodurans and similar bacterial sequences. This small-sized protein modify DNA topology by cleaving and resealing one strand of duplex DNA. This domain compris ...	This domain is found at the N-terminal end of Type I topoisomerase from Deinococcus radiodurans and similar bacterial sequences. This small-sized protein modify DNA topology by cleaving and resealing one strand of duplex DNA. This domain comprises three alpha-helices plus a five strand antiparallel beta-sheet [1]. It is found associated with Pfam:PF01028.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	type I topoisomerase, putative	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	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	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR035447	DNA topoisomerase I, N-terminal domain superfamily	Homologous Superfamily
A	IPR011010	DNA breaking-rejoining enzyme, catalytic core	Homologous Superfamily
A	IPR049331	DNA topoisomerase IB, N-terminal domain	Domain
A	IPR001631	DNA topoisomerase I	Family
A	IPR013500	DNA topoisomerase I, catalytic core, eukaryotic-type	Domain
A	IPR014711	DNA topoisomerase I, catalytic core, alpha-helical subdomain, eukaryotic-type	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.