ID A0A1W6MN75_9FLAO Unreviewed; 836 AA.
AC A0A1W6MN75;
DT 05-JUL-2017, integrated into UniProtKB/TrEMBL.
DT 05-JUL-2017, sequence version 1.
DT 27-MAR-2024, entry version 28.
DE RecName: Full=DNA topoisomerase 1 {ECO:0000256|HAMAP-Rule:MF_00952};
DE EC=5.6.2.1 {ECO:0000256|HAMAP-Rule:MF_00952};
DE AltName: Full=DNA topoisomerase I {ECO:0000256|HAMAP-Rule:MF_00952};
GN Name=topA {ECO:0000256|HAMAP-Rule:MF_00952};
GN ORFNames=BST97_14005 {ECO:0000313|EMBL:ARN79012.1};
OS Nonlabens spongiae.
OC Bacteria; Bacteroidota; Flavobacteriia; Flavobacteriales;
OC Flavobacteriaceae; Nonlabens.
OX NCBI_TaxID=331648 {ECO:0000313|EMBL:ARN79012.1, ECO:0000313|Proteomes:UP000193431};
RN [1] {ECO:0000313|EMBL:ARN79012.1, ECO:0000313|Proteomes:UP000193431}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=JCM 13191 {ECO:0000313|EMBL:ARN79012.1,
RC ECO:0000313|Proteomes:UP000193431};
RA Kumagai Y.;
RT "Trade-off between light-utilization and light-protection in marine
RT flavobacteria.";
RL Submitted (NOV-2016) 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_00952}.
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_00952};
CC -!- SUBUNIT: Monomer. {ECO:0000256|HAMAP-Rule:MF_00952}.
CC -!- SIMILARITY: Belongs to the type IA topoisomerase family.
CC {ECO:0000256|ARBA:ARBA00009446, ECO:0000256|HAMAP-Rule:MF_00952}.
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DR EMBL; CP019344; ARN79012.1; -; Genomic_DNA.
DR AlphaFoldDB; A0A1W6MN75; -.
DR STRING; 331648.BST97_14005; -.
DR OrthoDB; 9804262at2; -.
DR Proteomes; UP000193431; 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: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; 3.40.50.140; -; 1.
DR Gene3D; 1.10.460.10; Topoisomerase I, domain 2; 2.
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_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; IPR005733; TopoI_bac-type.
DR InterPro; IPR028612; Topoisom_1_IA.
DR InterPro; IPR025589; Toprim_C_rpt.
DR InterPro; IPR006171; TOPRIM_domain.
DR InterPro; IPR034149; TOPRIM_TopoI.
DR NCBIfam; TIGR01051; topA_bact; 1.
DR PANTHER; PTHR42785:SF1; DNA TOPOISOMERASE; 1.
DR PANTHER; PTHR42785; DNA TOPOISOMERASE, TYPE IA, CORE; 1.
DR Pfam; PF01131; Topoisom_bac; 2.
DR Pfam; PF01751; Toprim; 1.
DR Pfam; PF13368; Toprim_C_rpt; 2.
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_00952};
KW Isomerase {ECO:0000256|ARBA:ARBA00023235, ECO:0000256|HAMAP-Rule:MF_00952};
KW Magnesium {ECO:0000256|ARBA:ARBA00022842};
KW Metal-binding {ECO:0000256|ARBA:ARBA00022723};
KW Reference proteome {ECO:0000313|Proteomes:UP000193431};
KW Topoisomerase {ECO:0000256|ARBA:ARBA00023029, ECO:0000256|HAMAP-
KW Rule:MF_00952}.
FT DOMAIN 3..113
FT /note="Toprim"
FT /evidence="ECO:0000259|PROSITE:PS50880"
FT REGION 163..168
FT /note="Interaction with DNA"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00952"
FT REGION 315..341
FT /note="Disordered"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT REGION 814..836
FT /note="Disordered"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT COMPBIAS 817..836
FT /note="Basic residues"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT ACT_SITE 284
FT /note="O-(5'-phospho-DNA)-tyrosine intermediate"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00952"
FT SITE 33
FT /note="Interaction with DNA"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00952"
FT SITE 139
FT /note="Interaction with DNA"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00952"
FT SITE 140
FT /note="Interaction with DNA"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00952"
FT SITE 143
FT /note="Interaction with DNA"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00952"
FT SITE 148
FT /note="Interaction with DNA"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00952"
FT SITE 155
FT /note="Interaction with DNA"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00952"
FT SITE 286
FT /note="Interaction with DNA"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00952"
FT SITE 473
FT /note="Interaction with DNA"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00952"
SQ SEQUENCE 836 AA; 94666 MW; 0BD7055D8D1497B5 CRC64;
MSKNLVIVES PAKAKTIEKF LGKDFKVASS YGHIADLPSK ELGVDVDSDF APKYVVSSDK
KKLVSELKKQ AKNSDLIWLA SDEDREGEAI AWHLAEQLDL KKEKIKRIVF NAITKSAVQH
AIENPRGIDY DLVNAQQARR VLDRIVGYEI SPILWRKVKG GASAGRVQSV AVRLIVERED
EIINFKSEDS FRIDAEFTTD SGAVVKAKLP SNLNSLKEAQ DFLDQNIDAI FKVAELNKKP
AKKSPAPPFT TSTLQQEASR KLFFNVSRTM QLAQRLYEAG LITYMRTDSV NLSNEAKKGA
EQEIKNAYGD KFHKSRNYKG KSKGAQEAHE AIRPTDFSKH SAGNDRDQIR LYELIWKRAI
ASQMSDAQLE RTTVAIEADK HDKRFTASGE IVKFEGFLKV YLESTDDEDL EQEGLLPALE
EQQELFNQAI TATQRFTRPP YRYTEASLVK KLEELGIGRP STYAPTITTI QNRKYIEKGQ
SEGEERGYTQ LTLSNGKVKE KQLTEKTGSN KNKLVPTDVG RVVNSFLVEH FGEILDYNFT
AKVEESFDNI AEGKEEWTDM MDHFYKSFHP KVKDVAENAE REVGERELGK HPESGKPVIV
RLGRFGPMAQ IGHADDEEKP QFASLLPSQS LNTIELEEAL DLFKLPRTLG EYKGYPIEVN
QGRYGPYVKF NEKTFVSLEK TDDPMTITED RAMELIKAKE KADAPIYEYD GQPVTKGVGR
FGPFIKWAGM FISVNKKYDF DNLSNADIEM LIKDKIQKEK DKLIVDWEEE GIRIEKARWG
RHNIVKGKTK VEIGKEVDPL KVSLEKAKEL LEKKAPKKKT AAKRKSTTKL KTAKKS
//
