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Protein

DNA topoisomerase 1B

Gene

TOP1

Organism
Vaccinia virus (strain Copenhagen) (VACV)
Status
Reviewed-Annotation score: Annotation score: 3 out of 5-Experimental evidence at transcript leveli

Functioni

Releases the supercoiling and torsional tension of DNA 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 the specific target site 5'-[CT]CCTTp site in duplex DNA. The scissile phosphodiester is attacked by the catalytic tyrosine of the enzyme, resulting in the formation of a DNA-(3'-phosphotyrosyl)-enzyme intermediate and the expulsion of a 5'-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 5'-OH attacks the covalent intermediate to expel the active-site tyrosine and restore the DNA phosphodiester backbone (By similarity).By similarity

Catalytic activityi

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

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Sitei168Involved in religationBy similarity1
Active sitei274O-(3'-phospho-DNA)-tyrosine intermediatePROSITE-ProRule annotation1

GO - Molecular functioni

GO - Biological processi

Complete GO annotation...

Keywords - Molecular functioni

Isomerase, Topoisomerase

Keywords - Ligandi

DNA-binding

Names & Taxonomyi

Protein namesi
Recommended name:
DNA topoisomerase 1B (EC:5.99.1.2)
Short name:
TopIB
Alternative name(s):
DNA topoisomerase I
Late protein H6
Gene namesi
Name:TOP1
ORF Names:H6R
OrganismiVaccinia virus (strain Copenhagen) (VACV)
Taxonomic identifieri10249 [NCBI]
Taxonomic lineageiVirusesdsDNA viruses, no RNA stagePoxviridaeChordopoxvirinaeOrthopoxvirusVaccinia virus
Virus hostiHomo sapiens (Human) [TaxID: 9606]
Proteomesi
  • UP000008269 Componenti: Genome

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
ChainiPRO_00001452151 – 314DNA topoisomerase 1BAdd BLAST314

Expressioni

Inductioni

Expressed in the late phase of the viral replicative cycle.

Keywords - Developmental stagei

Late protein

Structurei

3D structure databases

ProteinModelPortaliP68697.
SMRiP68697.
ModBaseiSearch...
MobiDBiSearch...

Family & Domainsi

Sequence similaritiesi

Belongs to the type IB topoisomerase family.Curated

Family and domain databases

CDDicd00659. Topo_IB_C. 1 hit.
Gene3Di1.20.120.380. 1 hit.
3.30.66.10. 1 hit.
3.90.15.10. 1 hit.
InterProiIPR011010. DNA_brk_join_enz.
IPR001631. TopoI.
IPR018521. TopoI_AS.
IPR014711. TopoI_cat_a-hlx-sub_euk.
IPR027362. TopoI_cat_dom2.
IPR013500. TopoI_cat_euk.
IPR015346. TopoI_N_vir.
[Graphical view]
PfamiPF01028. Topoisom_I. 1 hit.
PF09266. VirDNA-topo-I_N. 1 hit.
[Graphical view]
PRINTSiPR00416. EUTPISMRASEI.
SUPFAMiSSF56349. SSF56349. 1 hit.
PROSITEiPS00176. TOPOISOMERASE_I_EUK. 1 hit.
[Graphical view]

Sequencei

Sequence statusi: Complete.

P68697-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
MRALFYKDGK LFTDNNFLNP VSDDNPAYEV LQHVKIPTHL TDVVVYEQTW
60 70 80 90 100
EEALTRLIFV GSDSKGRRQY FYGKMHVQNR NAKRDRIFVR VYNVMKRINC
110 120 130 140 150
FINKNIKKSS TDSNYQLAVF MLMETMFFIR FGKMKYLKEN ETVGLLTLKN
160 170 180 190 200
KHIEISPDEI VIKFVGKDKV SHEFVVHKSN RLYKPLLKLT DDSSPEEFLF
210 220 230 240 250
NKLSERKVYE CIKQFGIRIK DLRTYGVNYT FLYNFWTNVK SISPLPSPKK
260 270 280 290 300
LIALTIKQTA EVVGHTPSIS KRAYMATTIL EMVKDKNFLD VVSKTTFDEF
310
LSIVVDHVKS STDG
Length:314
Mass (Da):36,666
Last modified:August 1, 1988 - v1
Checksum:iE76FBCFCBF259D27
GO

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
M35027 Genomic DNA. Translation: AAA48093.1.
PIRiG24481. QQVZH7.

Cross-referencesi

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
M35027 Genomic DNA. Translation: AAA48093.1.
PIRiG24481. QQVZH7.

3D structure databases

ProteinModelPortaliP68697.
SMRiP68697.
ModBaseiSearch...
MobiDBiSearch...

Protocols and materials databases

Structural Biology KnowledgebaseSearch...

Family and domain databases

CDDicd00659. Topo_IB_C. 1 hit.
Gene3Di1.20.120.380. 1 hit.
3.30.66.10. 1 hit.
3.90.15.10. 1 hit.
InterProiIPR011010. DNA_brk_join_enz.
IPR001631. TopoI.
IPR018521. TopoI_AS.
IPR014711. TopoI_cat_a-hlx-sub_euk.
IPR027362. TopoI_cat_dom2.
IPR013500. TopoI_cat_euk.
IPR015346. TopoI_N_vir.
[Graphical view]
PfamiPF01028. Topoisom_I. 1 hit.
PF09266. VirDNA-topo-I_N. 1 hit.
[Graphical view]
PRINTSiPR00416. EUTPISMRASEI.
SUPFAMiSSF56349. SSF56349. 1 hit.
PROSITEiPS00176. TOPOISOMERASE_I_EUK. 1 hit.
[Graphical view]
ProtoNetiSearch...

Entry informationi

Entry nameiTOP1_VACCC
AccessioniPrimary (citable) accession number: P68697
Secondary accession number(s): P08585
Entry historyi
Integrated into UniProtKB/Swiss-Prot: August 1, 1988
Last sequence update: August 1, 1988
Last modified: November 30, 2016
This is version 58 of the entry and version 1 of the sequence. [Complete history]
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programViral 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.