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Protein

DNA topoisomerase 3

Gene

topB

Organism
Salmonella typhi
Status
Reviewed-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 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, Topoisomerase

Keywords - Ligandi

DNA-binding, Magnesium, Metal-binding

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
Synonyms:top3
Ordered Locus Names:STY1816, t1177
OrganismiSalmonella typhi
Taxonomic identifieri90370 [NCBI]
Taxonomic lineageiBacteriaProteobacteriaGammaproteobacteriaEnterobacteralesEnterobacteriaceaeSalmonella
Proteomesi
  • UP000002670 Componenti: Chromosome
  • UP000000541 Componenti: Chromosome

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
ChainiPRO_00001451851 – 649DNA topoisomerase 3Add BLAST649

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

STRINGi220341.STY1816.

Structurei

3D structure databases

ProteinModelPortaliQ8Z6F5.
ModBaseiSearch...
MobiDBiSearch...

Family & Domainsi

Domains and Repeats

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

Region

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

Sequence similaritiesi

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

Phylogenomic databases

eggNOGiENOG4105C73. Bacteria.
COG0550. LUCA.
HOGENOMiHOG000086848.
KOiK03169.
OMAiTQKKCPE.

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.

Q8Z6F5-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
MRLFIAEKPS LGRAIADVLP KPHRKGDGFI ECGNGQVVTW CIGHLLEQAQ
60 70 80 90 100
PDAYDSRYAR WNLADLPIVP EKWQLQPRPS VTKQLNVIKR FLHQAGEIIH
110 120 130 140 150
AGDPDREGQL LVDEVLDYLQ LPAEKRQQVR RCLINDLNPQ AVERAIDRLR
160 170 180 190 200
ANSDFVPLCV SALARARADW LYGINMTRAY TILGRNAGYQ GVLSVGRVQT
210 220 230 240 250
PVLGLVVRRD EEIENFVAKD FFEVKAHIVT PADERFTAIW QPSEACEPYQ
260 270 280 290 300
DEEGRLLHRP LAEHVVNRIN GQPALVTSYN DKRESESAPL PFSLSTLQIE
310 320 330 340 350
AAKRFGLSAQ NVLDICQKLY ETHKLITYPR SDCRYLPEEH FAGRQAVMNA
360 370 380 390 400
ISVHAPDLLP QPVVNPDTRN RCWDDKKVDA HHAIIPTARS SSVHLTENEA
410 420 430 440 450
KVYTLIARQY LMQFCPDAVF RKCVIELEIA KGKFVAKARF LAEAGWRTLL
460 470 480 490 500
GSKERDEEND GTPLSVVAKG DELLCEKGEV VERQTQPPRH FTDATLLSAM
510 520 530 540 550
TGIARFVQDK DLKKILRATD GLGTEATRAG IIELLFKRSF LTKKGRYIHS
560 570 580 590 600
TDAGKALIHS LPEMAARPDM TAHWESVLTQ ISEKQCRYQD FMQPLVGTLY
610 620 630 640
QLIDQAKRTP VKRFRGIVAP GGGEKKKSAP RKRAGKKSPP AEETGRQTE
Length:649
Mass (Da):73,087
Last modified:March 1, 2002 - v1
Checksum:i1620030D62ED1729
GO

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AL513382 Genomic DNA. Translation: CAD02056.1.
AE014613 Genomic DNA. Translation: AAO68834.1.
RefSeqiNP_456214.1. NC_003198.1.
WP_001235869.1. NZ_LUHL01000004.1.

Genome annotation databases

EnsemblBacteriaiAAO68834; AAO68834; t1177.
CAD02056; CAD02056; CAD02056.
GeneIDi1248185.
KEGGistt:t1177.
sty:STY1816.
PATRICi18541534. VBISalEnt120419_1829.

Cross-referencesi

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AL513382 Genomic DNA. Translation: CAD02056.1.
AE014613 Genomic DNA. Translation: AAO68834.1.
RefSeqiNP_456214.1. NC_003198.1.
WP_001235869.1. NZ_LUHL01000004.1.

3D structure databases

ProteinModelPortaliQ8Z6F5.
ModBaseiSearch...
MobiDBiSearch...

Protein-protein interaction databases

STRINGi220341.STY1816.

Protocols and materials databases

Structural Biology KnowledgebaseSearch...

Genome annotation databases

EnsemblBacteriaiAAO68834; AAO68834; t1177.
CAD02056; CAD02056; CAD02056.
GeneIDi1248185.
KEGGistt:t1177.
sty:STY1816.
PATRICi18541534. VBISalEnt120419_1829.

Phylogenomic databases

eggNOGiENOG4105C73. Bacteria.
COG0550. LUCA.
HOGENOMiHOG000086848.
KOiK03169.
OMAiTQKKCPE.

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 nameiTOP3_SALTI
AccessioniPrimary (citable) accession number: Q8Z6F5
Entry historyi
Integrated into UniProtKB/Swiss-Prot: August 13, 2002
Last sequence update: March 1, 2002
Last modified: November 2, 2016
This is version 107 of the entry and version 1 of the sequence. [Complete history]
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programProkaryotic Protein Annotation Program

Miscellaneousi

Keywords - Technical termi

Complete proteome

Documents

  1. SIMILARITY comments
    Index of protein domains and families

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.