ID A0A063Y137_9GAMM Unreviewed; 644 AA.
AC A0A063Y137;
DT 03-SEP-2014, integrated into UniProtKB/TrEMBL.
DT 03-SEP-2014, sequence version 1.
DT 24-JAN-2024, entry version 43.
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=ADINL_2906 {ECO:0000313|EMBL:KDE38451.1};
OS Nitrincola lacisaponensis.
OC Bacteria; Pseudomonadota; Gammaproteobacteria; Oceanospirillales;
OC Oceanospirillaceae; Nitrincola.
OX NCBI_TaxID=267850 {ECO:0000313|EMBL:KDE38451.1, ECO:0000313|Proteomes:UP000027318};
RN [1] {ECO:0000313|EMBL:KDE38451.1, ECO:0000313|Proteomes:UP000027318}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=4CA {ECO:0000313|EMBL:KDE38451.1,
RC ECO:0000313|Proteomes:UP000027318};
RX PubMed=16280482; DOI=10.1099/ijs.0.63647-0;
RA Dimitriu P.A., Shukla S.K., Conradt J., Marquez M.C., Ventosa A.,
RA Maglia A., Peyton B.M., Pinkart H.C., Mormile M.R.;
RT "Nitrincola lacisaponensis gen. nov., sp. nov., a novel alkaliphilic
RT bacterium isolated from an alkaline, saline lake.";
RL Int. J. Syst. Evol. Microbiol. 55:2273-2278(2005).
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:KDE38451.1}.
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DR EMBL; JMSZ01000042; KDE38451.1; -; Genomic_DNA.
DR RefSeq; WP_036549645.1; NZ_JMSZ01000042.1.
DR AlphaFoldDB; A0A063Y137; -.
DR STRING; 267850.ADINL_2906; -.
DR PATRIC; fig|267850.7.peg.2857; -.
DR OrthoDB; 9803554at2; -.
DR Proteomes; UP000027318; 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 Reference proteome {ECO:0000313|Proteomes:UP000027318};
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 ACT_SITE 329
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 331
FT /note="Interaction with DNA"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00953"
SQ SEQUENCE 644 AA; 72409 MW; E82213569DF1D629 CRC64;
MVKLFIAEKP SLGRALADAL PGPKQREDGY IRCGADIWVS WCIGHLLEQA EPDSYDPAYK
QWRLEHLPIL PSTWQLQPKS TTRKQLTLLR KLIKQADSLV HVGDPDREGQ LLVDEVINYS
GVNQAKREAT LRCLINDMNP DAIRKALQGL RQNSEFIPLA TSALARTRAD WLYGINMTRL
CTLLGQAAGY NGVLSIGRVQ TPVLGLVVHR DQEIEHFVSR PFYEVFVTLQ TTAGESFIAK
WKPSAACEPY MDEEGRVLSR RLAEVVLEKV KGKNGSVKAV KRDKKKQPAP LPYNLSALQI
DASKRFNLNA QKTLDICQQL YERHKLITYP RSDCRYLPNG HYAERQAVTQ AIAKTVSGLS
EAVGQADLGL KSKAWNDSKV SAHHAIIPTS RSMPAERLSQ DEQNIYELVA RQYLMQFYPP
FEYAEHQIDS EVEGGLFIAR QKSVLADGWK ALLPPQKSTR QDAEFSSVVL PNVKTGDLVN
CIDGRLDEKQ TSPPKHFTDA TLLAAMTGIA RFVSDPEIKK VLRDTDGLGT EATRAGIIEL
LFKRQFLTRK GKEIHSTDIG RLLVNSLPER MVVPDMTAHW ESQLGAISEK QMRYGEFMQP
LTQGLGELIS EVRRQDFRGL KGMGKKVVRK RRKPPAKRTV ARTN
//
