ID A0A2A9FYY7_9VIBR Unreviewed; 655 AA.
AC A0A2A9FYY7;
DT 20-DEC-2017, integrated into UniProtKB/TrEMBL.
DT 20-DEC-2017, sequence version 1.
DT 24-JAN-2024, entry version 22.
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=ATG66_2008 {ECO:0000313|EMBL:PFG55695.1};
OS Vibrio sp. ES.051.
OC Bacteria; Pseudomonadota; Gammaproteobacteria; Vibrionales; Vibrionaceae;
OC Vibrio.
OX NCBI_TaxID=1761909 {ECO:0000313|EMBL:PFG55695.1, ECO:0000313|Proteomes:UP000223114};
RN [1] {ECO:0000313|EMBL:PFG55695.1, ECO:0000313|Proteomes:UP000223114}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=ES.051 {ECO:0000313|EMBL:PFG55695.1,
RC ECO:0000313|Proteomes:UP000223114};
RA Fredrickson J.;
RT "Microbial Interactions in Extremophilic Mat Communities.";
RL Submitted (OCT-2017) 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 Note=Binds two Mg(2+) per subunit. {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 -!- CAUTION: The sequence shown here is derived from an EMBL/GenBank/DDBJ
CC whole genome shotgun (WGS) entry which is preliminary data.
CC {ECO:0000313|EMBL:PFG55695.1}.
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DR EMBL; PDJL01000004; PFG55695.1; -; Genomic_DNA.
DR AlphaFoldDB; A0A2A9FYY7; -.
DR OrthoDB; 9803554at2; -.
DR Proteomes; UP000223114; Unassembled WGS sequence.
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 Topoisomerase {ECO:0000256|ARBA:ARBA00023029, ECO:0000256|HAMAP-
KW Rule:MF_00953}.
FT DOMAIN 2..135
FT /note="Toprim"
FT /evidence="ECO:0000259|PROSITE:PS50880"
FT REGION 195..200
FT /note="Interaction with DNA"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00953"
FT REGION 612..655
FT /note="Disordered"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT ACT_SITE 332
FT /note="O-(5'-phospho-DNA)-tyrosine intermediate"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00953"
FT BINDING 8
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="1"
FT /ligand_note="catalytic"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00953"
FT BINDING 104
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="1"
FT /ligand_note="catalytic"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00953"
FT BINDING 104
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="2"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00953"
FT BINDING 106
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="2"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00953"
FT SITE 62
FT /note="Interaction with DNA"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00953"
FT SITE 171
FT /note="Interaction with DNA"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00953"
FT SITE 179
FT /note="Interaction with DNA"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00953"
FT SITE 334
FT /note="Interaction with DNA"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00953"
SQ SEQUENCE 655 AA; 73177 MW; 295A3F49A8CEE47B CRC64;
MSRLFIAEKP SLGRAIAAAL PTPQKKDQGF IRCGNGDVVT WCIGHLLEQV EPDAYDERYK
KWSMTDLPII PQQWQLRPRK SASKQLTVIR KLLKEANEVI HAGDPDREGQ LLVDEVLEHC
KLSKTKKAAT QRLLISDLNL PAVKRALSSM RSNREFIPLS VSALARSRAD WLYGMNMSRA
YTLLGQKAGY QGVLSVGRVQ TPVLGLVVRR DEEIENFVAK DFFTLHALIP YQDNNGTFDI
RARWKPSEAC QPWQDEEGRV LSRKLVENVA SRIKNQPAKV TESEQKQTKQ SAPLPYSLSA
LQIDAAKRYG LSAQQALDTC QALYEKHKLI TYPRSDCRYL PMEHYAQART VTSAIANNTK
ELQSAVQGAD LTLKSKAWND KKVDAHHAII PTPKQANVNA LSANEMKIYQ LIARQYLMQF
YPTAVYAEAK LVFDIAGGTF IAKGRQLLSS GWKVLMGKTD KDDEGIDAVP PLSEGTVLTC
REGEIKDRKT EPPKHFTEAT LLQAMTGIAR YVADKELKKI LRDTDGLGTE ATRAGILDTL
FKRQLLTRQG KSILSSQAGR GLIHALPQDA TYPDMTANWE HQLQGMSERN QAYQPFMQAL
EQRISGLMGQ VKSGPIPDSL RHLPKVDRPA FKRNKRSYAK GGAAKSGASK RKSTS
//
