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Crystal structure of full-length E.Coli topoisomerase I in complex with ssDNA External Resource: Annotation Chains Type Family Name Domain Identifier Family Identifier Provenance Source (Version) A SCOP2B Superfamily Toprim domain-like 8055743 3000737 SCOP2B (2022-06-29) A SCOP2B Superfamily Zinc beta-ribbon 8039157 3001238 SCOP2B (2022-06-29) A SCOP2B Superfamily Prokaryotic type I DNA topoisomerase clamp domain-like 8036554 3001789 SCOP2B (2022-06-29)
Chains Family Name Domain Identifier Architecture Possible Homology Homology Topology Family Provenance Source (Version) A Topoisom_bac_2nd e4rulA9 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: Topoisom_bac_2nd ECOD (1.6) A Topoisom_bac_3rd e4rulA5 A: alpha arrays X: HTH H: HTH T: winged F: Topoisom_bac_3rd ECOD (1.6) A Topoisom_bac_1st e4rulA6 A: alpha arrays X: HTH H: HTH T: winged F: Topoisom_bac_1st ECOD (1.6) A Toprim e4rulA4 A: a/b three-layered sandwiches X: HAD domain-like H: HAD domain-related T: Toprim domain F: Toprim ECOD (1.6) A zf-C4_Topoisom e4rulA3 A: few secondary structure elements X: Rubredoxin-like H: Rubredoxin-related T: Rubredoxin-related F: zf-C4_Topoisom ECOD (1.6) A Topo_Zn_Ribbon e4rulA8 A: few secondary structure elements X: Rubredoxin-like H: Rubredoxin-related T: Rubredoxin-related F: Topo_Zn_Ribbon ECOD (1.6) A Topo_Zn_Ribbon_1 e4rulA7 A: few secondary structure elements X: Rubredoxin-like H: Rubredoxin-related T: Rubredoxin-related F: Topo_Zn_Ribbon_1 ECOD (1.6) A YrdD e4rulA2 A: few secondary structure elements X: Rubredoxin-like H: Rubredoxin-related T: Rubredoxin-related F: YrdD ECOD (1.6)
Chains Accession Name Description Comments Source PF21372 Topoisomerase I, zinc finger (TOP1_ZnF) Topoisomerase I, zinc finger This entry represents a zinc ribbon domain found at the C-terminal of topoisomerase I from bacteria (it corresponds to D6 described in [1]. Topoisomerase I has an essential function in preventing hypernegative supercoiling of DNA. The C-terminal doma ... This entry represents a zinc ribbon domain found at the C-terminal of topoisomerase I from bacteria (it corresponds to D6 described in [1]. Topoisomerase I has an essential function in preventing hypernegative supercoiling of DNA. The C-terminal domains bind ssDNA to recognise the accumulation of negative supercoils in duplex DNA [1]. Less Domain PF01396 Topoisomerase DNA binding C4 zinc finger (zf-C4_Topoisom) Topoisomerase DNA binding C4 zinc finger - Domain PF01131 DNA topoisomerase (Topoisom_bac) DNA topoisomerase - Family PF08272 Topoisomerase I zinc-ribbon-like (Topo_Zn_Ribbon) Topoisomerase I zinc-ribbon-like Some Proteobacteria topoisomerase I contain two zinc-ribbon-like domains at the C-terminus that structurally homologous to Pfam:PF01396. However, this domain no longer bind zinc. Indeed, only one of the four cysteine residues remains [1]. Domain PF01751 Toprim domain (Toprim) Toprim domain - Family
Chains Polymer Molecular Function Biological Process Cellular Component DNA topoisomerase 1 single strand DNA - - -
Chains Accession Name Type IPR013498 DNA topoisomerase, type IA, zn finger Domain IPR013497 DNA topoisomerase, type IA, central Domain IPR003602 DNA topoisomerase, type IA, DNA-binding domain Domain IPR049330 Topoisomerase I, zinc finger Domain IPR013263 DNA topoisomerase I, zinc ribbon-like, bacterial-type Domain IPR023405 DNA topoisomerase, type IA, core domain Homologous Superfamily IPR013825 DNA topoisomerase, type IA, central region, subdomain 2 Homologous Superfamily IPR003601 DNA topoisomerase, type IA, domain 2 Domain IPR028612 DNA topoisomerase I, type IA Family IPR000380 DNA topoisomerase, type IA Family IPR013826 DNA topoisomerase, type IA, central region, subdomain 3 Homologous Superfamily IPR006171 TOPRIM domain Domain IPR023406 DNA topoisomerase, type IA, active site Active Site IPR005733 DNA topoisomerase I, bacterial-type Family IPR034149 DNA topoisomerase 1, TOPRIM domain Domain IPR013824 DNA topoisomerase, type IA, central region, subdomain 1 Homologous Superfamily