TOP1_SALTY
ID TOP1_SALTY Reviewed; 865 AA.
AC P0A2I1; P40686;
DT 15-MAR-2005, integrated into UniProtKB/Swiss-Prot.
DT 15-MAR-2005, sequence version 1.
DT 03-AUG-2022, entry version 113.
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=STM1714;
OS Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720).
OC Bacteria; Proteobacteria; Gammaproteobacteria; Enterobacterales;
OC Enterobacteriaceae; Salmonella.
OX NCBI_TaxID=99287;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=LT2 / SGSC1412 / ATCC 700720;
RX PubMed=11677609; DOI=10.1038/35101614;
RA McClelland M., Sanderson K.E., Spieth J., Clifton S.W., Latreille P.,
RA Courtney L., Porwollik S., Ali J., Dante M., Du F., Hou S., Layman D.,
RA Leonard S., Nguyen C., Scott K., Holmes A., Grewal N., Mulvaney E.,
RA Ryan E., Sun H., Florea L., Miller W., Stoneking T., Nhan M., Waterston R.,
RA Wilson R.K.;
RT "Complete genome sequence of Salmonella enterica serovar Typhimurium LT2.";
RL Nature 413:852-856(2001).
RN [2]
RP NUCLEOTIDE SEQUENCE [GENOMIC DNA] OF 856-865.
RX PubMed=3032952; DOI=10.1016/s0021-9258(18)45528-7;
RA Ostrowski J., Jagura-Burdzy G., Kredich N.M.;
RT "DNA sequences of the cysB regions of Salmonella typhimurium and
RT Escherichia coli.";
RL J. Biol. Chem. 262:5999-6005(1987).
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; AE006468; AAL20632.1; -; Genomic_DNA.
DR EMBL; M15040; AAA27044.1; -; Genomic_DNA.
DR RefSeq; NP_460673.1; NC_003197.2.
DR RefSeq; WP_000513593.1; NC_003197.2.
DR AlphaFoldDB; P0A2I1; -.
DR SMR; P0A2I1; -.
DR STRING; 99287.STM1714; -.
DR PaxDb; P0A2I1; -.
DR EnsemblBacteria; AAL20632; AAL20632; STM1714.
DR GeneID; 1253233; -.
DR KEGG; stm:STM1714; -.
DR PATRIC; fig|99287.12.peg.1811; -.
DR HOGENOM; CLU_002929_4_3_6; -.
DR OMA; PECKYTR; -.
DR PhylomeDB; P0A2I1; -.
DR BioCyc; SENT99287:STM1714-MON; -.
DR Proteomes; UP000001014; 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; IPR013263; TopoI_Znr_bac.
DR InterPro; IPR028612; Topoisom_1_IA.
DR InterPro; IPR006171; TOPRIM_domain.
DR InterPro; IPR034149; TOPRIM_TopoI.
DR PANTHER; PTHR42785; PTHR42785; 1.
DR Pfam; PF08272; Topo_Zn_Ribbon; 2.
DR Pfam; PF01131; Topoisom_bac; 1.
DR Pfam; PF01751; Toprim; 1.
DR Pfam; PF01396; zf-C4_Topoisom; 2.
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; Reference proteome;
KW Repeat; Topoisomerase; Zinc; Zinc-finger.
FT CHAIN 1..865
FT /note="DNA topoisomerase 1"
FT /id="PRO_0000145165"
FT DOMAIN 3..142
FT /note="Toprim"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00952"
FT ZN_FING 599..630
FT /note="C4-type 1"
FT ZN_FING 662..689
FT /note="C4-type 2"
FT ZN_FING 711..736
FT /note="C4-type 3"
FT REGION 37..65
FT /note="Disordered"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT REGION 192..197
FT /note="Interaction with DNA"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00952"
FT COMPBIAS 51..65
FT /note="Basic and acidic residues"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT ACT_SITE 319
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 111
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 111
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="2"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00952"
FT BINDING 113
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 168
FT /note="Interaction with DNA"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00952"
FT SITE 169
FT /note="Interaction with DNA"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00952"
FT SITE 172
FT /note="Interaction with DNA"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00952"
FT SITE 177
FT /note="Interaction with DNA"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00952"
FT SITE 184
FT /note="Interaction with DNA"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00952"
FT SITE 321
FT /note="Interaction with DNA"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00952"
FT SITE 507
FT /note="Interaction with DNA"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00952"
SQ SEQUENCE 865 AA; 97303 MW; 57EE1CBA696FEF7C CRC64;
MGKALVIVES PAKAKTINKY LGNDYVVKSS VGHIRDLPTS GSAAKKSADS TSTKTAKKPK
KDERGALVNR MGVDPWHNWD AHYEVLPGKE KVVSELKQLA EKADHIYLAT DLDREGEAIA
WHLREVIGGD DARYSRVVFN EITKNAIRQA FEQPGELNIN RVNAQQARRF MDRVVGYMVS
PLLWKKIARG LSAGRVQSVA VRLVVERERE IKAFVPEEFW EIDANTTTPS GEALPLQVTH
QNDKPFRPVN REQTLAAVSL LEKARYSVLE REDKPTSSKP GAPFITSTLQ QAASTRLGFG
VKKTMMMAQR LYEAGYITYM RTDSTNLSQD AVNMVRGYIG DNFGKKYLPD NPNQYASKEN
SQEAHEAIRP SDVAVMAESL KDMEADAQKL YQLIWRQFVA CQMTPAQYDS TTLTVGAGEF
RLKARGRILR FDGWTKVMPA LRKGDEDRTL PAVNKGDALT LLELTPAQHF TKPPARFSEA
SLVKELEKRG IGRPSTYASI ISTIQDRGYV RVENRRFYAE KMGEIVTDRL EENFRELMNY
DFTAQMEDSL DQVANHQAEW KAVLDNFFSD FTQQLDKAEK DPEEGGMRPN QMVLTSIDCP
TCGRKMGIRT ASTGVFLGCS GYALSPKERC KTTINLVPEN EVLNVLEGDD AETNALRAKR
RCQKCGTAMD SYLIDPKRKL HVCGNNPTCD GYEIEEGEFR IKGYDGPIVE CEKCGSEMHL
KMGRFGKYMA CTNDECKNTR KILRNGEVAP PKEDPVPLPE LPCEKSDAYF VLRDGAAGIF
LAANTFPKSR ETRAPLVEEL YRFRDRLPEK LRYLADAPQQ DPEGNKTVVR FSRKTKQQYV
AAEKDGKATG WSAFFVDGKW VEGKK
