ID W0EC04_9FIRM Unreviewed; 725 AA.
AC W0EC04;
DT 19-MAR-2014, integrated into UniProtKB/TrEMBL.
DT 19-MAR-2014, sequence version 1.
DT 24-JAN-2024, entry version 49.
DE RecName: Full=DNA topoisomerase 3 {ECO:0000256|HAMAP-Rule:MF_00953};
DE EC=5.6.2.1 {ECO:0000256|HAMAP-Rule:MF_00953};
DE AltName: Full=DNA topoisomerase III {ECO:0000256|HAMAP-Rule:MF_00953};
GN Name=topB {ECO:0000256|HAMAP-Rule:MF_00953};
GN ORFNames=DESME_08280 {ECO:0000313|EMBL:AHF07068.1};
OS Desulfitobacterium metallireducens DSM 15288.
OC Bacteria; Bacillota; Clostridia; Eubacteriales; Desulfitobacteriaceae;
OC Desulfitobacterium.
OX NCBI_TaxID=871968 {ECO:0000313|EMBL:AHF07068.1, ECO:0000313|Proteomes:UP000010847};
RN [1] {ECO:0000313|EMBL:AHF07068.1, ECO:0000313|Proteomes:UP000010847}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=DSM 15288 {ECO:0000313|Proteomes:UP000010847};
RG DOE Joint Genome Institute;
RA Smidt H., Huntemann M., Han J., Chen A., Kyrpides N., Mavromatis K.,
RA Markowitz V., Palaniappan K., Ivanova N., Schaumberg A., Pati A.,
RA Liolios K., Nordberg H.P., Cantor M.N., Hua S.X., Woyke T.;
RL Submitted (DEC-2013) to the EMBL/GenBank/DDBJ databases.
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:0000256|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;
CC Evidence={ECO:0000256|ARBA:ARBA00000213, ECO:0000256|HAMAP-
CC Rule:MF_00953};
CC -!- COFACTOR:
CC Name=Mg(2+); Xref=ChEBI:CHEBI:18420;
CC Evidence={ECO:0000256|HAMAP-Rule:MF_00953};
CC -!- SIMILARITY: Belongs to the type IA topoisomerase family.
CC {ECO:0000256|ARBA:ARBA00009446, ECO:0000256|HAMAP-Rule:MF_00953}.
CC -!- CAUTION: Lacks conserved residue(s) required for the propagation of
CC feature annotation. {ECO:0000256|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; CP007032; AHF07068.1; -; Genomic_DNA.
DR RefSeq; WP_006717153.1; NZ_CP007032.1.
DR AlphaFoldDB; W0EC04; -.
DR STRING; 871968.DESME_08280; -.
DR KEGG; dmt:DESME_08280; -.
DR eggNOG; COG0550; Bacteria.
DR eggNOG; COG0551; Bacteria.
DR HOGENOM; CLU_002929_5_2_9; -.
DR OrthoDB; 9803554at2; -.
DR Proteomes; UP000010847; Chromosome.
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; 3.40.50.140; -; 1.
DR Gene3D; 1.10.460.10; Topoisomerase I, domain 2; 1.
DR Gene3D; 2.70.20.10; Topoisomerase I, domain 3; 1.
DR Gene3D; 1.10.290.10; Topoisomerase I, domain 4; 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 NCBIfam; TIGR01056; topB; 1.
DR PANTHER; PTHR11390:SF21; DNA TOPOISOMERASE 3-ALPHA; 1.
DR PANTHER; PTHR11390; PROKARYOTIC DNA TOPOISOMERASE; 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; Prokaryotic type I DNA topoisomerase; 1.
DR PROSITE; PS00396; TOPOISOMERASE_I_PROK; 1.
DR PROSITE; PS50880; TOPRIM; 1.
PE 3: Inferred from homology;
KW DNA-binding {ECO:0000256|ARBA:ARBA00023125, ECO:0000256|HAMAP-
KW Rule:MF_00953};
KW Isomerase {ECO:0000256|ARBA:ARBA00023235, ECO:0000256|HAMAP-Rule:MF_00953};
KW Magnesium {ECO:0000256|HAMAP-Rule:MF_00953};
KW Metal-binding {ECO:0000256|HAMAP-Rule:MF_00953};
KW Reference proteome {ECO:0000313|Proteomes:UP000010847};
KW Topoisomerase {ECO:0000256|ARBA:ARBA00023029, ECO:0000256|HAMAP-
KW Rule:MF_00953}.
FT DOMAIN 3..134
FT /note="Toprim"
FT /evidence="ECO:0000259|PROSITE:PS50880"
FT REGION 187..192
FT /note="Interaction with DNA"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00953"
FT ACT_SITE 309
FT /note="O-(5'-phospho-DNA)-tyrosine intermediate"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00953"
FT BINDING 9
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_note="catalytic"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00953"
FT BINDING 105
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_note="catalytic"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00953"
FT SITE 61
FT /note="Interaction with DNA"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00953"
FT SITE 168
FT /note="Interaction with DNA"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00953"
FT SITE 176
FT /note="Interaction with DNA"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00953"
FT SITE 311
FT /note="Interaction with DNA"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00953"
SQ SEQUENCE 725 AA; 82651 MW; 228324ABCD1BAB50 CRC64;
MKKSLILAEK PSVGREIARV LGCHQKGNGC LIGPQYIVTW ALGHLVTLAD PEAYDDRYKT
WRLDDLPMLP QKMELVVIKE TSKQYAAVKH LLRQPDIDEL IIATDAGREG ELVARWILAK
GGWHKPIKRL WISSQTDKAI KEGFRNLKPG QNYESLYDAA ESRAEADWYV GLNVTRALTC
KYNAQLSAGR VQTPTLALIV EREKEIKKFV PKDYWTINAY AKGFSLRWQD KKCQTRIFDN
HQAEQLLAKV SGQEAVIIDV KKEGKKELPP LAYDLTELQR DANRKYGYSA KKTSSIMQQL
YEHYKIVTYP RTDSRHLTED IVPTLPERLR TIAVGPYANL ARPILRTKIS PTKRLVDNTK
VSDHHAIIPT EEPVFLNKLS QEEARIYDLI VRRFFAVLSP AFEYEQTTVI LEIKGEIFTA
KGKNMKQKGW RNAYEDLDSS EEEREETEQT LPDLKVKERL NLLSIKSVPG KTKPPKRYTE
ATLLSAMEHP GQKVEDESLR EMLEKTSGLG TPATRADIIE KLFNSFYMER QGKEIIPTSK
GIQLIGLVPS DLKSPELTAK WEQQLNEISK GGEKRQPFVQ GIKGYARHLV SEVIASNQTF
HHDNLTRMKC PNCGKFLLKV KGKRGEMLVC QDRECGYREG LSVHSNARCP QCHKKMELRG
DGEHKIFTCT CGYREKLSAF TQRREHDGKG SVNKKEVQKY MQKQKSDVTV NTALADALAK
LKLGK
//
