Annotations: 6PCM

Crystal Structure of Mycobacterium smegmatis Topoisomerase I with ssDNA bound to both N- and C-terminal domains

External Resource: Annotation

Domain Annotation: ECOD Classification
Domain Annotation: CATH
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
B	Ribosomal_L41	e6pcmB1	A: alpha arrays	X: putative RnfG subunit of electron transport complex	H: putative RnfG subunit of electron transport complex	T: Aspartate/ornithine carbamoyltransferase	F: Ribosomal_L41	ECOD (v295.2)
A	Cation_ATPase_C,Cation_ATPase_N	e6pcmA1	A: alpha arrays	X: putative RnfG subunit of electron transport complex	H: putative RnfG subunit of electron transport complex	T: Class I glutamine amidotransferase-like	F: Cation_ATPase_C,Cation_ATPase_N	ECOD (v295.2)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
B	3.40.50.140	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold		CATH (utative)
B	1.10.290.10	Mainly Alpha	Orthogonal Bundle	Topoisomerase I	domain 4	CATH (utative)
A	3.40.50.140	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold		CATH (utative)
A	1.10.290.10	Mainly Alpha	Orthogonal Bundle	Topoisomerase I	domain 4	CATH (utative)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF01131	DNA topoisomerase (Topoisom_bac)	DNA topoisomerase	-	Family
A, B	PF01751	Toprim domain (Toprim)	Toprim domain	-	Family
A, B	PF13368	Topoisomerase C-terminal repeat (Toprim_C_rpt)	Topoisomerase C-terminal repeat	This domain is repeated up to five times to form the C-terminal region of bacterial topoisomerase immediately downstream of the zinc-finger motif.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
C, D	DNA (5'-D(PAPGPTPGPAPGPCPGPAPGPCPTPTPCPCPGPCPTPTPGPAPCPTPT)-3')	-	-	-
A, B	DNA topoisomerase 1	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 cation binding ion binding metal ion binding 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 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 organelle organization cellular process metabolic process cellular component organization or biogenesis macromolecule metabolic process	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR013497	DNA topoisomerase, type IA, central	Domain
A, B	IPR003602	DNA topoisomerase, type IA, DNA-binding domain	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	IPR025589	Topoisomerase C-terminal repeat	Repeat
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

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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.