TOP3_STAAS
ID TOP3_STAAS Reviewed; 711 AA.
AC Q6G767;
DT 01-MAY-2007, integrated into UniProtKB/Swiss-Prot.
DT 19-JUL-2004, sequence version 1.
DT 03-AUG-2022, entry version 109.
DE RecName: Full=DNA topoisomerase 3 {ECO:0000255|HAMAP-Rule:MF_00953};
DE EC=5.6.2.1 {ECO:0000255|HAMAP-Rule:MF_00953};
DE AltName: Full=DNA topoisomerase III {ECO:0000255|HAMAP-Rule:MF_00953};
GN Name=topB {ECO:0000255|HAMAP-Rule:MF_00953}; OrderedLocusNames=SAS2145;
OS Staphylococcus aureus (strain MSSA476).
OC Bacteria; Firmicutes; Bacilli; Bacillales; Staphylococcaceae;
OC Staphylococcus.
OX NCBI_TaxID=282459;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=MSSA476;
RX PubMed=15213324; DOI=10.1073/pnas.0402521101;
RA Holden M.T.G., Feil E.J., Lindsay J.A., Peacock S.J., Day N.P.J.,
RA Enright M.C., Foster T.J., Moore C.E., Hurst L., Atkin R., Barron A.,
RA Bason N., Bentley S.D., Chillingworth C., Chillingworth T., Churcher C.,
RA Clark L., Corton C., Cronin A., Doggett J., Dowd L., Feltwell T., Hance Z.,
RA Harris B., Hauser H., Holroyd S., Jagels K., James K.D., Lennard N.,
RA Line A., Mayes R., Moule S., Mungall K., Ormond D., Quail M.A.,
RA Rabbinowitsch E., Rutherford K.M., Sanders M., Sharp S., Simmonds M.,
RA Stevens K., Whitehead S., Barrell B.G., Spratt B.G., Parkhill J.;
RT "Complete genomes of two clinical Staphylococcus aureus strains: evidence
RT for the rapid evolution of virulence and drug resistance.";
RL Proc. Natl. Acad. Sci. U.S.A. 101:9786-9791(2004).
CC -!- FUNCTION: Releases the supercoiling and torsional tension of DNA, which
CC is introduced during the DNA replication and transcription, by
CC transiently cleaving and rejoining one strand of the DNA duplex.
CC Introduces a single-strand break via transesterification at a target
CC site in duplex DNA. The scissile phosphodiester is attacked by the
CC catalytic tyrosine of the enzyme, resulting in the formation of a DNA-
CC (5'-phosphotyrosyl)-enzyme intermediate and the expulsion of a 3'-OH
CC DNA strand. The free DNA strand then undergoes passage around the
CC unbroken strand, thus removing DNA supercoils. Finally, in the
CC religation step, the DNA 3'-OH attacks the covalent intermediate to
CC expel the active-site tyrosine and restore the DNA phosphodiester
CC backbone. {ECO:0000255|HAMAP-Rule:MF_00953}.
CC -!- CATALYTIC ACTIVITY:
CC Reaction=ATP-independent breakage of single-stranded DNA, followed by
CC passage and rejoining.; EC=5.6.2.1; Evidence={ECO:0000255|HAMAP-
CC Rule:MF_00953};
CC -!- COFACTOR:
CC Name=Mg(2+); Xref=ChEBI:CHEBI:18420;
CC Evidence={ECO:0000255|HAMAP-Rule:MF_00953};
CC -!- SIMILARITY: Belongs to the type IA topoisomerase family.
CC {ECO:0000255|HAMAP-Rule:MF_00953}.
CC ---------------------------------------------------------------------------
CC Copyrighted by the UniProt Consortium, see https://www.uniprot.org/terms
CC Distributed under the Creative Commons Attribution (CC BY 4.0) License
CC ---------------------------------------------------------------------------
DR EMBL; BX571857; CAG43956.1; -; Genomic_DNA.
DR RefSeq; WP_000838479.1; NC_002953.3.
DR AlphaFoldDB; Q6G767; -.
DR SMR; Q6G767; -.
DR PRIDE; Q6G767; -.
DR KEGG; sas:SAS2145; -.
DR HOGENOM; CLU_002929_5_2_9; -.
DR OMA; TYPRVDT; -.
DR GO; GO:0003677; F:DNA binding; IEA:UniProtKB-KW.
DR GO; GO:0003917; F:DNA topoisomerase type I (single strand cut, ATP-independent) activity; IEA:UniProtKB-UniRule.
DR GO; GO:0000287; F:magnesium ion binding; IEA:UniProtKB-UniRule.
DR GO; GO:0006265; P:DNA topological change; IEA:UniProtKB-UniRule.
DR CDD; cd00186; TOP1Ac; 1.
DR CDD; cd03362; TOPRIM_TopoIA_TopoIII; 1.
DR Gene3D; 1.10.290.10; -; 1.
DR Gene3D; 1.10.460.10; -; 1.
DR Gene3D; 2.70.20.10; -; 1.
DR HAMAP; MF_00953; Topoisom_3_prok; 1.
DR InterPro; IPR000380; Topo_IA.
DR InterPro; IPR003601; Topo_IA_2.
DR InterPro; IPR023406; Topo_IA_AS.
DR InterPro; IPR013497; Topo_IA_cen.
DR InterPro; IPR013824; Topo_IA_cen_sub1.
DR InterPro; IPR013825; Topo_IA_cen_sub2.
DR InterPro; IPR013826; Topo_IA_cen_sub3.
DR InterPro; IPR023405; Topo_IA_core_domain.
DR InterPro; IPR003602; Topo_IA_DNA-bd_dom.
DR InterPro; IPR005738; TopoIII.
DR InterPro; IPR006171; TOPRIM_domain.
DR InterPro; IPR034144; TOPRIM_TopoIII.
DR PANTHER; PTHR11390; PTHR11390; 1.
DR Pfam; PF01131; Topoisom_bac; 1.
DR Pfam; PF01751; Toprim; 1.
DR PRINTS; PR00417; PRTPISMRASEI.
DR SMART; SM00437; TOP1Ac; 1.
DR SMART; SM00436; TOP1Bc; 1.
DR SMART; SM00493; TOPRIM; 1.
DR SUPFAM; SSF56712; SSF56712; 1.
DR TIGRFAMs; TIGR01056; topB; 1.
DR PROSITE; PS00396; TOPOISOMERASE_I_PROK; 1.
DR PROSITE; PS50880; TOPRIM; 1.
PE 3: Inferred from homology;
KW DNA-binding; Isomerase; Magnesium; Metal-binding; Topoisomerase.
FT CHAIN 1..711
FT /note="DNA topoisomerase 3"
FT /id="PRO_0000286374"
FT DOMAIN 2..135
FT /note="Toprim"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00953"
FT REGION 186..191
FT /note="Interaction with DNA"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00953"
FT REGION 691..711
FT /note="Disordered"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT ACT_SITE 305
FT /note="O-(5'-phospho-DNA)-tyrosine intermediate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00953"
FT BINDING 8
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_note="catalytic"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00953"
FT BINDING 104
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_note="catalytic"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00953"
FT SITE 60
FT /note="Interaction with DNA"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00953"
FT SITE 167
FT /note="Interaction with DNA"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00953"
FT SITE 175
FT /note="Interaction with DNA"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00953"
FT SITE 307
FT /note="Interaction with DNA"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00953"
SQ SEQUENCE 711 AA; 81524 MW; 9C67B5BAC841CBB6 CRC64;
MKSLILAEKP SVARDIADAL QINQKRNGYF ENNQYIVTWA LGHLVTNATP EQYDKNLKEW
RLEDLPIIPK YMKTVVIGKT SKQFKTVKAL ILDNKVKDII IATDAGREGE LVARLILDKV
GNKKPIRRLW ISSVTKKAIQ QGFKNLKDGR QYNDLYYAAL ARSEADWIVG INATRALTTK
YDAQLSLGRV QTPTIQLVNT RQQEINQFKP QQYFTLSLTV KGFDFQLESN QRYTNKETLE
QMVNNLKNVD GKIKSVATKH KKSYPQSLYN LTDLQQDMYR RYKIGPKETL NTLQSLYERH
KVVTYPRTDS NYLTTDMVDT MKERIQATMA TTYKDQARPL MSKTFSSKMS IFNNQKVSDH
HAIIPTEVRP VMSDLSNREL KLYDMIVERF LEALMPPHEY DAITVTLEVA GHTFVLKENV
TTVLGFKSIR QGESITEMQQ PFSEGDEVKI SKTNIREHET TPPEYFNEGS LLKAMENPQN
FIQLKDKKYA QTLKQTGGIG TVATRADIID KLFNMNAIES RDGKIKVTSK GKQILELAPE
ELTSPLLTAQ WEEKLLLIER GKYQAKTFIN EMKDFTKDVV NGIKNSDRKY KHDNLTTTEC
PTCGKFMIKV KTKNGQMLVC QDPSCKTKKN VQRKTNARCP NCKKKLTLFG KGKEAVYRCV
CGHSETQAHM DQRMKSKSSG KVSRKEMKKY MNKNEGLDNN PFKDALKNLN L
