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Protein

DNA topoisomerase 3

Gene

topB

Organism
Psychromonas ingrahamii (strain 37)
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)LengthDescriptionGraphical viewFeature identifierActions
Metal bindingi7 – 71Magnesium 1; catalyticUniRule annotation
Metal bindingi103 – 1031Magnesium 1; catalyticUniRule annotation
Metal bindingi103 – 1031Magnesium 2UniRule annotation
Metal bindingi105 – 1051Magnesium 2UniRule annotation
Active sitei331 – 3311O-(5'-phospho-DNA)-tyrosine intermediateUniRule annotation

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

Enzyme and pathway databases

BioCyciPING357804:GJBJ-2554-MONOMER.

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:Ping_2461Imported
OrganismiPsychromonas ingrahamii (strain 37)Imported
Taxonomic identifieri357804 [NCBI]
Taxonomic lineageiBacteriaProteobacteriaGammaproteobacteriaAlteromonadalesPsychromonadaceaePsychromonas
Proteomesi
  • UP000000639 Componenti: Chromosome

Interactioni

Sites

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Sitei61 – 611Interaction with DNAUniRule annotation
Sitei170 – 1701Interaction with DNAUniRule annotation
Sitei178 – 1781Interaction with DNAUniRule annotation
Sitei333 – 3331Interaction with DNAUniRule annotation

Protein-protein interaction databases

STRINGi357804.Ping_2461.

Structurei

3D structure databases

ProteinModelPortaliA1SXH7.
SMRiA1SXH7. Positions 1-605.
ModBaseiSearch...
MobiDBiSearch...

Family & Domainsi

Domains and Repeats

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Domaini1 – 134134ToprimInterPro annotationAdd
BLAST

Region

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Regioni194 – 1996Interaction with DNAUniRule annotation

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.
OrthoDBiPOG091H028X.

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.

A1SXH7-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
MKLYIAEKPS LARAIADALP KPHRKADGCI YVGNGDVVSW CIGHLLTQVD
60 70 80 90 100
PEAYDPEYKK WKFEHLPIIP ENWKLKSTPR TSKQLSILKK LIKQADNLVH
110 120 130 140 150
VGDPDREGQL LVDEVIHFSG VKGNKLKQVE RCLVSDLTTN AVKRSLQQLR
160 170 180 190 200
SNQEFIALST SALARTRADW LYGLNLTRVY TLQAQKSGYQ GVISVGRVQT
210 220 230 240 250
PLLGLVARRD KEIEVFVSKP FYEVEAHLTT LKPENVAAFT AKWKPSEACE
260 270 280 290 300
KYQDHEGRVL VKKLAENVAQ RISQQHAVVK SFTAKNKKQV APLPYNLSAL
310 320 330 340 350
QIDAAKRFSY TALEVLDICQ ALYEKYKLIT YPRSDSRYLP KNHLSQAGSV
360 370 380 390 400
TRAIANNQPA LKKAVSNADI SLQSRAWNDK KVDAHHAIIP TDKHQSLTSL
410 420 430 440 450
DTASQNIYAL IARQYLCQFY ADYHYGECVA EIEINNGLFI SKAKAKISDG
460 470 480 490 500
WKVLFDKQEK DSYLPALSKG QKLFCDKGEV IEKNTQPPAY FTDATLLAAM
510 520 530 540 550
SNIARYVKDG ELKAVLKETD GLGTEATRAG IIELLFKRLF LQRTGKLIKA
560 570 580 590 600
TETGRKLIES LPEMLTLPDM TAQWEMELNA ISQKEQSYQG FVVPLQNQLK
610 620 630 640
SIIEKAIADG PRALANLPSS GNVFKKTYRK KSTKKGTFKK KGS
Length:643
Mass (Da):72,153
Last modified:February 6, 2007 - v1
Checksum:iF6F166786C07A442
GO

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
CP000510 Genomic DNA. Translation: ABM04192.1.
RefSeqiWP_011770752.1. NC_008709.1.

Genome annotation databases

EnsemblBacteriaiABM04192; ABM04192; Ping_2461.
KEGGipin:Ping_2461.
PATRICi23070243. VBIPsyIng103130_2716.

Cross-referencesi

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
CP000510 Genomic DNA. Translation: ABM04192.1.
RefSeqiWP_011770752.1. NC_008709.1.

3D structure databases

ProteinModelPortaliA1SXH7.
SMRiA1SXH7. Positions 1-605.
ModBaseiSearch...
MobiDBiSearch...

Protein-protein interaction databases

STRINGi357804.Ping_2461.

Protocols and materials databases

Structural Biology KnowledgebaseSearch...

Genome annotation databases

EnsemblBacteriaiABM04192; ABM04192; Ping_2461.
KEGGipin:Ping_2461.
PATRICi23070243. VBIPsyIng103130_2716.

Phylogenomic databases

eggNOGiENOG4105C73. Bacteria.
COG0550. LUCA.
HOGENOMiHOG000086848.
KOiK03169.
OMAiFCPDAEY.
OrthoDBiPOG091H028X.

Enzyme and pathway databases

BioCyciPING357804:GJBJ-2554-MONOMER.

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 nameiA1SXH7_PSYIN
AccessioniPrimary (citable) accession number: A1SXH7
Entry historyi
Integrated into UniProtKB/TrEMBL: February 6, 2007
Last sequence update: February 6, 2007
Last modified: September 7, 2016
This is version 87 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.