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Protein

DNA topoisomerase 3

Gene

topB

Organism
Escherichia coli 907713
Status
Unreviewed-Annotation score: -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

Keywordsi

Molecular functionDNA-bindingUniRule annotation, Isomerase, TopoisomeraseUniRule annotation
LigandMagnesiumUniRule 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
ORF Names:HMPREF1599_05273Imported
OrganismiEscherichia coli 907713Imported
Taxonomic identifieri1268986 [NCBI]
Taxonomic lineageiBacteriaProteobacteriaGammaproteobacteriaEnterobacteralesEnterobacteriaceaeEscherichia
Proteomesi
  • UP000017474 Componenti: Unassembled WGS sequence

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

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 annotation

Family and domain databases

CDDicd00186. TOP1Ac. 1 hit.
cd03362. TOPRIM_TopoIA_TopoIII. 1 hit.
Gene3Di1.10.290.10. 1 hit.
1.10.460.10. 2 hits.
2.70.20.10. 2 hits.
HAMAPiMF_00953. Topoisom_3_prok. 1 hit.
InterProiView protein in InterPro
IPR000380. Topo_IA.
IPR003601. Topo_IA_2.
IPR023406. Topo_IA_AS.
IPR013497. Topo_IA_cen.
IPR013824. Topo_IA_cen_sub1.
IPR013825. Topo_IA_cen_sub2.
IPR013826. Topo_IA_cen_sub3.
IPR023405. Topo_IA_core_domain.
IPR003602. Topo_IA_DNA-bd_dom.
IPR005738. TopoIII.
IPR006171. TOPRIM_domain.
IPR034144. TOPRIM_TopoIII.
PANTHERiPTHR11390. PTHR11390. 1 hit.
PfamiView protein in Pfam
PF01131. Topoisom_bac. 1 hit.
PF01751. Toprim. 1 hit.
PRINTSiPR00417. PRTPISMRASEI.
SMARTiView protein in SMART
SM00437. TOP1Ac. 1 hit.
SM00436. TOP1Bc. 1 hit.
SM00493. TOPRIM. 1 hit.
SUPFAMiSSF56712. SSF56712. 1 hit.
TIGRFAMsiTIGR01056. topB. 1 hit.
PROSITEiView protein in PROSITE
PS00396. TOPOISOMERASE_I_PROK. 1 hit.
PS50880. TOPRIM. 1 hit.

Sequencei

Sequence statusi: Complete.

U9Z298-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
MRLFIAEKPS LARAIADVLP KPHRKGDGFI ECGNGQVVTW CIGHLLEQAQ
60 70 80 90 100
PDAYDSRYAR WNLADLPIVP EKWQLQPRPS VTKQLNVIKR FLHEASEIVH
110 120 130 140 150
AGDPDREGQL LVDEVLDYLQ LAPEKRQQVQ RCLINDLNPQ AVERAIDRLR
160 170 180 190 200
SNSEFVPLCV SALARARADW LYGINMTRAY TILGRNAGYQ GVLSVGRVQT
210 220 230 240 250
PVLGLVVRRD EEIENFVAKD FFEVKAHIVT PADERFTAIW QPSEACEPYQ
260 270 280 290 300
DEEGRLLHRP LAEHVVNRIS GQPAIVTSYN DKRESESAPL PFSLSALQIE
310 320 330 340 350
AAKRFGLSAQ NVLDICQKLY ETHKLITYPR SDCRYLPEEH FAGRHAVMNA
360 370 380 390 400
ISVHAPDLLP QPVVDPDIRN RCWDDKKVDA HHAIIPTARS SAINLTENEA
410 420 430 440 450
KVYNLIARQY LMQFCPDAVF RKCVIELDIA KGKFVAKARF LAEAGWRTLL
460 470 480 490 500
GSKERDEEND GTPLPVVAKG DELLCEKGEV VERQTQPPRH FTDATLLSAM
510 520 530 540 550
TGIARFVQDK DLKKILRATD GLGTEATRAG IIELLFKRGF LTKKGRYIHS
560 570 580 590 600
TDAGKALFHS LPEMATRPDM TAHWESVLTQ ISEKQCRYQD FMQPLVGTLY
610 620 630 640 650
QLIDQAKRTS VRQFRGIMAP GGGEGKKKDS PRKRAPKKSP PSEEAGNGVI

I
Length:651
Mass (Da):73,234
Last modified:January 22, 2014 - v1
Checksum:i340A7A16AAECE8C2
GO

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AXUI01000229 Genomic DNA. Translation: ESA79701.1.
RefSeqiWP_001235804.1. NZ_KI522279.1.

Genome annotation databases

EnsemblBacteriaiESA79701; ESA79701; HMPREF1599_05273.
PATRICifig|1268986.3.peg.4811.

Similar proteinsi

Entry informationi

Entry nameiU9Z298_ECOLX
AccessioniPrimary (citable) accession number: U9Z298
Entry historyiIntegrated into UniProtKB/TrEMBL: January 22, 2014
Last sequence update: January 22, 2014
Last modified: February 28, 2018
This is version 31 of the entry and version 1 of the sequence. See complete history.
Entry statusiUnreviewed (UniProtKB/TrEMBL)

Miscellaneousi

Caution

The sequence shown here is derived from an EMBL/GenBank/DDBJ whole genome shotgun (WGS) entry which is preliminary data.Imported

Keywords - Technical termi

Complete proteomeImported