TOP1_STAAR
ID TOP1_STAAR Reviewed; 689 AA.
AC Q6GHI5;
DT 01-MAY-2007, integrated into UniProtKB/Swiss-Prot.
DT 19-JUL-2004, sequence version 1.
DT 03-AUG-2022, entry version 116.
DE RecName: Full=DNA topoisomerase 1 {ECO:0000255|HAMAP-Rule:MF_00952};
DE EC=5.6.2.1 {ECO:0000255|HAMAP-Rule:MF_00952};
DE AltName: Full=DNA topoisomerase I {ECO:0000255|HAMAP-Rule:MF_00952};
DE AltName: Full=Omega-protein;
DE AltName: Full=Relaxing enzyme;
DE AltName: Full=Swivelase;
DE AltName: Full=Untwisting enzyme;
GN Name=topA {ECO:0000255|HAMAP-Rule:MF_00952}; OrderedLocusNames=SAR1226;
OS Staphylococcus aureus (strain MRSA252).
OC Bacteria; Firmicutes; Bacilli; Bacillales; Staphylococcaceae;
OC Staphylococcus.
OX NCBI_TaxID=282458;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=MRSA252;
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_00952}.
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_00952};
CC -!- COFACTOR:
CC Name=Mg(2+); Xref=ChEBI:CHEBI:18420;
CC Evidence={ECO:0000255|HAMAP-Rule:MF_00952};
CC Note=Binds two Mg(2+) per subunit. {ECO:0000255|HAMAP-Rule:MF_00952};
CC -!- SUBUNIT: Monomer. {ECO:0000255|HAMAP-Rule:MF_00952}.
CC -!- SIMILARITY: Belongs to the type IA topoisomerase family.
CC {ECO:0000255|HAMAP-Rule:MF_00952}.
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DR EMBL; BX571856; CAG40228.1; -; Genomic_DNA.
DR AlphaFoldDB; Q6GHI5; -.
DR SMR; Q6GHI5; -.
DR KEGG; sar:SAR1226; -.
DR HOGENOM; CLU_002929_4_3_9; -.
DR OMA; PECKYTR; -.
DR Proteomes; UP000000596; Chromosome.
DR GO; GO:0005694; C:chromosome; IEA:InterPro.
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:0046872; F:metal ion binding; IEA:UniProtKB-KW.
DR GO; GO:0006265; P:DNA topological change; IEA:UniProtKB-UniRule.
DR CDD; cd00186; TOP1Ac; 1.
DR CDD; cd03363; TOPRIM_TopoIA_TopoI; 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_00952; Topoisom_1_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; IPR013498; Topo_IA_Znf.
DR InterPro; IPR005733; TopoI_bac-type.
DR InterPro; IPR028612; Topoisom_1_IA.
DR InterPro; IPR006171; TOPRIM_domain.
DR InterPro; IPR034149; TOPRIM_TopoI.
DR PANTHER; PTHR42785; PTHR42785; 1.
DR Pfam; PF01131; Topoisom_bac; 1.
DR Pfam; PF01751; Toprim; 1.
DR Pfam; PF01396; zf-C4_Topoisom; 3.
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; TIGR01051; topA_bact; 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; Repeat; Topoisomerase;
KW Zinc; Zinc-finger.
FT CHAIN 1..689
FT /note="DNA topoisomerase 1"
FT /id="PRO_0000285937"
FT DOMAIN 3..113
FT /note="Toprim"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00952"
FT ZN_FING 577..603
FT /note="C4-type 1"
FT ZN_FING 617..645
FT /note="C4-type 2"
FT ZN_FING 658..681
FT /note="C4-type 3"
FT REGION 163..168
FT /note="Interaction with DNA"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00952"
FT REGION 328..357
FT /note="Disordered"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT COMPBIAS 328..342
FT /note="Basic and acidic residues"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT ACT_SITE 298
FT /note="O-(5'-phospho-DNA)-tyrosine intermediate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00952"
FT BINDING 9
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="1"
FT /ligand_note="catalytic"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00952"
FT BINDING 82
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="1"
FT /ligand_note="catalytic"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00952"
FT BINDING 82
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="2"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00952"
FT BINDING 84
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="2"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00952"
FT SITE 33
FT /note="Interaction with DNA"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00952"
FT SITE 139
FT /note="Interaction with DNA"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00952"
FT SITE 140
FT /note="Interaction with DNA"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00952"
FT SITE 143
FT /note="Interaction with DNA"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00952"
FT SITE 148
FT /note="Interaction with DNA"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00952"
FT SITE 155
FT /note="Interaction with DNA"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00952"
FT SITE 300
FT /note="Interaction with DNA"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00952"
FT SITE 488
FT /note="Interaction with DNA"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00952"
SQ SEQUENCE 689 AA; 79071 MW; 05A19252CCC9EFDD CRC64;
MADNLVIVES PAKAKTIEKY LGKKYKVIAS MGHVRDLPRS QMGVDTEDNY EPKYITIRGK
GPVVKELKKH AKKAKNVFLA SDPDREGEAI AWHLSKILEL EDSKENRVVF NEITKDAVKE
SFKNPREIEM NLVDAQQARR ILDRLVGYNI SPVLWKKVKK GLSAGRVQSV ALRLVIDREN
EIRNFKPEEY WTIEGEFRYK KSKFNAKFLH YKNKPFKLKT KKDVEKITAA LDGDQFEITN
VTKKEKTRNP ANPFTTSTLQ QEAARKLNFK ARKTMMVAQQ LYEGIDLKKQ GTIGLITYMR
TDSTRISDTA KAEAKQYITD KYGESYTSKR KASGKQGDQD AHEAIRPSST MRTPDDMKSF
LTKDQYRLYK LIWERFVASQ MAPAILDTVS LDITQGDIKF RANGQTIKFK GFMTLYVETK
DDSDSEKENK LPKLEQGDKV TATQIEPAQH YTQPPPRYTE ARLVKTLEEL KIGRPSTYAP
TIDTIQKRNY VKLESKRFVP TELGEIVHEQ VKEYFPEIID VEFTVNMETL LDKIAEGDIT
WRKVIDGFFS SFKQDVERAE EEMEKIEIKD EPAGEDCEVC GSPMVIKMGR YGKFMACSNF
PDCRNTKAIV KSIGVKCPKC NDGDVVERKS KKNRVFYGCS KYPECDFISW DKPIGRDCPK
CNQYLVENKK GKTTQVICSN CDYKEAAQK
