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P0A2I1 (TOP1_SALTY) Reviewed, UniProtKB/Swiss-Prot

Last modified April 16, 2014. Version 76. Feed History...

Clusters with 100%, 90%, 50% identity | Documents (1) | Third-party data text xml rdf/xml gff fasta
to top of pageNames·Attributes·General annotation·Ontologies·Sequence annotation·Sequences·References·Cross-refs·Entry info·DocumentsCustomize order

Names and origin

Protein namesRecommended name:
DNA topoisomerase 1

EC=5.99.1.2
Alternative name(s):
DNA topoisomerase I
Omega-protein
Relaxing enzyme
Swivelase
Untwisting enzyme
Gene names
Name:topA
Ordered Locus Names:STM1714
OrganismSalmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720) [Reference proteome] [HAMAP]
Taxonomic identifier99287 [NCBI]
Taxonomic lineageBacteriaProteobacteriaGammaproteobacteriaEnterobacterialesEnterobacteriaceaeSalmonella

Protein attributes

Sequence length865 AA.
Sequence statusComplete.
Protein existenceInferred from homology

General annotation (Comments)

Function

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 By similarity. HAMAP-Rule MF_00952

Catalytic activity

ATP-independent breakage of single-stranded DNA, followed by passage and rejoining. HAMAP-Rule MF_00952

Cofactor

Magnesium. Binds two Mg2+ per subunit By similarity. HAMAP-Rule MF_00952

Subunit structure

Monomer By similarity. HAMAP-Rule MF_00952

Sequence similarities

Belongs to the type IA topoisomerase family.

Contains 1 Toprim domain.

Sequence annotation (Features)

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifier

Molecule processing

Chain1 – 865865DNA topoisomerase 1 HAMAP-Rule MF_00952
PRO_0000145165

Regions

Domain3 – 142140Toprim
Zinc finger599 – 63032C4-type 1 HAMAP-Rule MF_00952
Zinc finger662 – 68928C4-type 2 HAMAP-Rule MF_00952
Zinc finger711 – 73626C4-type 3 HAMAP-Rule MF_00952
Region192 – 1976Interaction with DNA By similarity

Sites

Active site3191O-(5'-phospho-DNA)-tyrosine intermediate By similarity
Metal binding91Magnesium 1; catalytic By similarity
Metal binding1111Magnesium 1; catalytic By similarity
Metal binding1111Magnesium 2 By similarity
Metal binding1131Magnesium 2 By similarity
Site331Interaction with DNA By similarity
Site1681Interaction with DNA By similarity
Site1691Interaction with DNA By similarity
Site1721Interaction with DNA By similarity
Site1771Interaction with DNA By similarity
Site1841Interaction with DNA By similarity
Site3211Interaction with DNA By similarity
Site5071Interaction with DNA By similarity

Sequences

Sequence LengthMass (Da)Tools
P0A2I1 [UniParc].

Last modified March 15, 2005. Version 1.
Checksum: 57EE1CBA696FEF7C

FASTA86597,303
        10         20         30         40         50         60 
MGKALVIVES PAKAKTINKY LGNDYVVKSS VGHIRDLPTS GSAAKKSADS TSTKTAKKPK 

        70         80         90        100        110        120 
KDERGALVNR MGVDPWHNWD AHYEVLPGKE KVVSELKQLA EKADHIYLAT DLDREGEAIA 

       130        140        150        160        170        180 
WHLREVIGGD DARYSRVVFN EITKNAIRQA FEQPGELNIN RVNAQQARRF MDRVVGYMVS 

       190        200        210        220        230        240 
PLLWKKIARG LSAGRVQSVA VRLVVERERE IKAFVPEEFW EIDANTTTPS GEALPLQVTH 

       250        260        270        280        290        300 
QNDKPFRPVN REQTLAAVSL LEKARYSVLE REDKPTSSKP GAPFITSTLQ QAASTRLGFG 

       310        320        330        340        350        360 
VKKTMMMAQR LYEAGYITYM RTDSTNLSQD AVNMVRGYIG DNFGKKYLPD NPNQYASKEN 

       370        380        390        400        410        420 
SQEAHEAIRP SDVAVMAESL KDMEADAQKL YQLIWRQFVA CQMTPAQYDS TTLTVGAGEF 

       430        440        450        460        470        480 
RLKARGRILR FDGWTKVMPA LRKGDEDRTL PAVNKGDALT LLELTPAQHF TKPPARFSEA 

       490        500        510        520        530        540 
SLVKELEKRG IGRPSTYASI ISTIQDRGYV RVENRRFYAE KMGEIVTDRL EENFRELMNY 

       550        560        570        580        590        600 
DFTAQMEDSL DQVANHQAEW KAVLDNFFSD FTQQLDKAEK DPEEGGMRPN QMVLTSIDCP 

       610        620        630        640        650        660 
TCGRKMGIRT ASTGVFLGCS GYALSPKERC KTTINLVPEN EVLNVLEGDD AETNALRAKR 

       670        680        690        700        710        720 
RCQKCGTAMD SYLIDPKRKL HVCGNNPTCD GYEIEEGEFR IKGYDGPIVE CEKCGSEMHL 

       730        740        750        760        770        780 
KMGRFGKYMA CTNDECKNTR KILRNGEVAP PKEDPVPLPE LPCEKSDAYF VLRDGAAGIF 

       790        800        810        820        830        840 
LAANTFPKSR ETRAPLVEEL YRFRDRLPEK LRYLADAPQQ DPEGNKTVVR FSRKTKQQYV 

       850        860 
AAEKDGKATG WSAFFVDGKW VEGKK 

« Hide

References

« Hide 'large scale' references
[1]"Complete genome sequence of Salmonella enterica serovar Typhimurium LT2."
McClelland M., Sanderson K.E., Spieth J., Clifton S.W., Latreille P., Courtney L., Porwollik S., Ali J., Dante M., Du F., Hou S., Layman D., Leonard S., Nguyen C., Scott K., Holmes A., Grewal N., Mulvaney E. expand/collapse author list , Ryan E., Sun H., Florea L., Miller W., Stoneking T., Nhan M., Waterston R., Wilson R.K.
Nature 413:852-856(2001) [PubMed] [Europe PMC] [Abstract]
Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
Strain: LT2 / SGSC1412 / ATCC 700720.
[2]"DNA sequences of the cysB regions of Salmonella typhimurium and Escherichia coli."
Ostrowski J., Jagura-Burdzy G., Kredich N.M.
J. Biol. Chem. 262:5999-6005(1987) [PubMed] [Europe PMC] [Abstract]
Cited for: NUCLEOTIDE SEQUENCE [GENOMIC DNA] OF 856-865.

Cross-references

Sequence databases

EMBL
GenBank
DDBJ
AE006468 Genomic DNA. Translation: AAL20632.1.
M15040 Genomic DNA. Translation: AAA27044.1.
RefSeqNP_460673.1. NC_003197.1.

3D structure databases

ProteinModelPortalP0A2I1.
SMRP0A2I1. Positions 2-595, 745-865.
ModBaseSearch...
MobiDBSearch...

Protein-protein interaction databases

STRING99287.STM1714.

Proteomic databases

PaxDbP0A2I1.
PRIDEP0A2I1.

Protocols and materials databases

StructuralBiologyKnowledgebaseSearch...

Genome annotation databases

EnsemblBacteriaAAL20632; AAL20632; STM1714.
GeneID1253233.
KEGGstm:STM1714.
PATRIC32381943. VBISalEnt20916_1811.

Phylogenomic databases

eggNOGCOG0551.
HOGENOMHOG000004018.
KOK03168.
OMAMVYKMGR.
OrthoDBEOG6S7XQ9.
ProtClustDBPRK07561.

Enzyme and pathway databases

BioCycSENT99287:GCTI-1723-MONOMER.

Family and domain databases

Gene3D1.10.460.10. 2 hits.
2.70.20.10. 2 hits.
3.40.50.140. 1 hit.
HAMAPMF_00952. Topoisom_1_prok.
InterProIPR000380. 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.
IPR013498. Topo_IA_Znf.
IPR005733. TopoI_bac-type.
IPR013263. TopoI_Znr_bac.
IPR028612. Topoisom_1_IA.
IPR006171. Toprim_domain.
[Graphical view]
PANTHERPTHR11390. PTHR11390. 1 hit.
PfamPF08272. Topo_Zn_Ribbon. 2 hits.
PF01131. Topoisom_bac. 1 hit.
PF01751. Toprim. 1 hit.
PF01396. zf-C4_Topoisom. 2 hits.
[Graphical view]
PRINTSPR00417. PRTPISMRASEI.
SMARTSM00437. TOP1Ac. 1 hit.
SM00436. TOP1Bc. 1 hit.
SM00493. TOPRIM. 1 hit.
[Graphical view]
SUPFAMSSF56712. SSF56712. 1 hit.
TIGRFAMsTIGR01051. topA_bact. 1 hit.
PROSITEPS00396. TOPOISOMERASE_I_PROK. 1 hit.
PS50880. TOPRIM. 1 hit.
[Graphical view]
ProtoNetSearch...

Entry information

Entry nameTOP1_SALTY
AccessionPrimary (citable) accession number: P0A2I1
Secondary accession number(s): P40686
Entry history
Integrated into UniProtKB/Swiss-Prot: March 15, 2005
Last sequence update: March 15, 2005
Last modified: April 16, 2014
This is version 76 of the entry and version 1 of the sequence. [Complete history]
Entry statusReviewed (UniProtKB/Swiss-Prot)
Annotation programProkaryotic Protein Annotation Program

Relevant documents

SIMILARITY comments

Index of protein domains and families