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Protein

DNA topoisomerase 3

Gene

topB

Organism
Enterobacter sp. (strain 638)
Status
Unreviewed-Annotation score: Annotation score: 3 out of 5-Protein inferred from homologyi

Functioni

Releases the supercoiling and torsional tension of DNA, which is introduced during the DNA replication and transcription, by transiently cleaving and rejoining one strand of the DNA duplex. Introduces a single-strand break via transesterification at a target site in duplex DNA. The scissile phosphodiester is attacked by the catalytic tyrosine of the enzyme, resulting in the formation of a DNA-(5'-phosphotyrosyl)-enzyme intermediate and the expulsion of a 3'-OH DNA strand. The free DNA strand then undergoes passage around the unbroken strand, thus removing DNA supercoils. Finally, in the religation step, the DNA 3'-OH attacks the covalent intermediate to expel the active-site tyrosine and restore the DNA phosphodiester backbone.UniRule annotation

Catalytic activityi

ATP-independent breakage of single-stranded DNA, followed by passage and rejoining.UniRule annotationSAAS annotation

Cofactori

Mg2+UniRule annotationNote: Binds two Mg2+ per subunit.UniRule annotation

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Metal bindingi7Magnesium 1; catalyticUniRule annotation1
Metal bindingi103Magnesium 1; catalyticUniRule annotation1
Metal bindingi103Magnesium 2UniRule annotation1
Metal bindingi105Magnesium 2UniRule annotation1
Active sitei328O-(5'-phospho-DNA)-tyrosine intermediateUniRule annotation1

GO - Molecular functioni

GO - Biological processi

Complete GO annotation...

Keywords - Molecular functioni

Isomerase, TopoisomeraseUniRule annotationSAAS annotation

Keywords - Ligandi

DNA-bindingUniRule annotationSAAS annotation, MagnesiumUniRule annotation, Metal-bindingUniRule annotation

Names & Taxonomyi

Protein namesi
Recommended name:
DNA topoisomerase 3UniRule annotation (EC:5.99.1.2UniRule annotation)
Alternative name(s):
DNA topoisomerase IIIUniRule annotation
Gene namesi
Name:topBUniRule annotation
Ordered Locus Names:Ent638_1684Imported
OrganismiEnterobacter sp. (strain 638)Imported
Taxonomic identifieri399742 [NCBI]
Taxonomic lineageiBacteriaProteobacteriaGammaproteobacteriaEnterobacteralesEnterobacteriaceaeEnterobacter
Proteomesi
  • UP000000230 Componenti: Chromosome

Interactioni

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Sitei61Interaction with DNAUniRule annotation1
Sitei170Interaction with DNAUniRule annotation1
Sitei178Interaction with DNAUniRule annotation1
Sitei185Interaction with DNAUniRule annotation1
Sitei330Interaction with DNAUniRule annotation1

Protein-protein interaction databases

STRINGi399742.Ent638_1684.

Structurei

3D structure databases

ProteinModelPortaliA4W9I3.
ModBaseiSearch...
MobiDBiSearch...

Family & Domainsi

Domains and Repeats

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Domaini1 – 134ToprimInterPro annotationAdd BLAST134

Region

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Regioni194 – 199Interaction with DNAUniRule annotation6

Sequence similaritiesi

Belongs to the type IA topoisomerase family.UniRule annotationSAAS annotation
Contains 1 Toprim domain.UniRule annotation

Phylogenomic databases

eggNOGiENOG4105C73. Bacteria.
COG0550. LUCA.
HOGENOMiHOG000086848.
KOiK03169.
OMAiFCPDAEY.

Family and domain databases

CDDicd00186. TOP1Ac. 1 hit.
Gene3Di1.10.460.10. 2 hits.
2.70.20.10. 2 hits.
3.40.50.140. 1 hit.
HAMAPiMF_00953. Topoisom_3_prok. 1 hit.
InterProiIPR000380. Topo_IA.
IPR003601. Topo_IA_2.
IPR023406. Topo_IA_AS.
IPR013497. Topo_IA_cen.
IPR013824. Topo_IA_cen_sub1.
IPR013825. Topo_IA_cen_sub2.
IPR023405. Topo_IA_core_domain.
IPR003602. Topo_IA_DNA-bd_dom.
IPR005738. TopoIII.
IPR006171. Toprim_domain.
[Graphical view]
PANTHERiPTHR11390. PTHR11390. 2 hits.
PfamiPF01131. Topoisom_bac. 1 hit.
PF01751. Toprim. 1 hit.
[Graphical view]
PRINTSiPR00417. PRTPISMRASEI.
SMARTiSM00437. TOP1Ac. 1 hit.
SM00436. TOP1Bc. 1 hit.
SM00493. TOPRIM. 1 hit.
[Graphical view]
SUPFAMiSSF56712. SSF56712. 1 hit.
TIGRFAMsiTIGR01056. topB. 1 hit.
PROSITEiPS00396. TOPOISOMERASE_I_PROK. 1 hit.
PS50880. TOPRIM. 1 hit.
[Graphical view]

Sequencei

Sequence statusi: Complete.

A4W9I3-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
MRLYIAEKPS LARAIADVLP KPHRKGDGFI ECGKGQVVTW CIGHLLEQAQ
60 70 80 90 100
PDVYDSRYAR WNLNDLPIVP EKWRLQPRPS VTKQLNVIKR FLHDAAEIVH
110 120 130 140 150
AGDPDREGQL LVDEVLDYLE LAPEKRKQVQ RCLINDLNPQ AVERAISRLR
160 170 180 190 200
SNNEFIPLCV SALARARADW LYGINMTRAY TILGRNAGYQ GVLSVGRVQT
210 220 230 240 250
PVLGLVVRRD EEIENFVAKD FFEVKAHIVT PKDERFVAVW QPSEACEPYQ
260 270 280 290 300
DEEGRLLHRP LAEHVVNRIA GQPAIVTSYN DKRESEPAPL PFSLSALQIE
310 320 330 340 350
AGKRYGMSAQ NVLDICQKLY ETHKLITYPR SDSRYLPEEH FAGRHAVLNA
360 370 380 390 400
IGVHTPDLLP QPAVNLETRN RCWDDKKVDA HHAIIPTARA SNVNLTENES
410 420 430 440 450
KVYQLVARQY LMQFCADAMF RKCVIELEIA KAKFVAKARF LAEAGWRTLL
460 470 480 490 500
GNKERDEEND GTPLPVVAKN DELLCEKGEV IERQTQPPRH FTDATLLSAM
510 520 530 540 550
TGIARFVQDK DLKKILRATD GLGTEATRAG IIELLFKRGF LIKKGRYIQS
560 570 580 590 600
TDPGRALIHS LPELAARPDM TAHWESILTK ISEKECRYQD FMQPLVGTLF
610 620 630
DLINQARTTP VKNFRGMVAP GGAKKPFKKK KSAA
Length:634
Mass (Da):71,675
Last modified:May 29, 2007 - v1
Checksum:iCC95F40D72929A71
GO

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
CP000653 Genomic DNA. Translation: ABP60363.1.
RefSeqiWP_012017079.1. NC_009436.1.

Genome annotation databases

EnsemblBacteriaiABP60363; ABP60363; Ent638_1684.
KEGGient:Ent638_1684.
PATRICi20412985. VBIEntSp101211_1824.

Cross-referencesi

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
CP000653 Genomic DNA. Translation: ABP60363.1.
RefSeqiWP_012017079.1. NC_009436.1.

3D structure databases

ProteinModelPortaliA4W9I3.
ModBaseiSearch...
MobiDBiSearch...

Protein-protein interaction databases

STRINGi399742.Ent638_1684.

Protocols and materials databases

Structural Biology KnowledgebaseSearch...

Genome annotation databases

EnsemblBacteriaiABP60363; ABP60363; Ent638_1684.
KEGGient:Ent638_1684.
PATRICi20412985. VBIEntSp101211_1824.

Phylogenomic databases

eggNOGiENOG4105C73. Bacteria.
COG0550. LUCA.
HOGENOMiHOG000086848.
KOiK03169.
OMAiFCPDAEY.

Family and domain databases

CDDicd00186. TOP1Ac. 1 hit.
Gene3Di1.10.460.10. 2 hits.
2.70.20.10. 2 hits.
3.40.50.140. 1 hit.
HAMAPiMF_00953. Topoisom_3_prok. 1 hit.
InterProiIPR000380. Topo_IA.
IPR003601. Topo_IA_2.
IPR023406. Topo_IA_AS.
IPR013497. Topo_IA_cen.
IPR013824. Topo_IA_cen_sub1.
IPR013825. Topo_IA_cen_sub2.
IPR023405. Topo_IA_core_domain.
IPR003602. Topo_IA_DNA-bd_dom.
IPR005738. TopoIII.
IPR006171. Toprim_domain.
[Graphical view]
PANTHERiPTHR11390. PTHR11390. 2 hits.
PfamiPF01131. Topoisom_bac. 1 hit.
PF01751. Toprim. 1 hit.
[Graphical view]
PRINTSiPR00417. PRTPISMRASEI.
SMARTiSM00437. TOP1Ac. 1 hit.
SM00436. TOP1Bc. 1 hit.
SM00493. TOPRIM. 1 hit.
[Graphical view]
SUPFAMiSSF56712. SSF56712. 1 hit.
TIGRFAMsiTIGR01056. topB. 1 hit.
PROSITEiPS00396. TOPOISOMERASE_I_PROK. 1 hit.
PS50880. TOPRIM. 1 hit.
[Graphical view]
ProtoNetiSearch...

Entry informationi

Entry nameiA4W9I3_ENT38
AccessioniPrimary (citable) accession number: A4W9I3
Entry historyi
Integrated into UniProtKB/TrEMBL: May 29, 2007
Last sequence update: May 29, 2007
Last modified: November 2, 2016
This is version 83 of the entry and version 1 of the sequence. [Complete history]
Entry statusiUnreviewed (UniProtKB/TrEMBL)

Miscellaneousi

Keywords - Technical termi

Complete proteome, Reference proteomeImported

Similar proteinsi

Links to similar proteins from the UniProt Reference Clusters (UniRef) at 100%, 90% and 50% sequence identity:
100%UniRef100 combines identical sequences and sub-fragments with 11 or more residues from any organism into one UniRef entry.
90%UniRef90 is built by clustering UniRef100 sequences that have at least 90% sequence identity to, and 80% overlap with, the longest sequence (a.k.a seed sequence).
50%UniRef50 is built by clustering UniRef90 seed sequences that have at least 50% sequence identity to, and 80% overlap with, the longest sequence in the cluster.