ID A0A1Q3M3F1_9BACT Unreviewed; 796 AA.
AC A0A1Q3M3F1;
DT 12-APR-2017, integrated into UniProtKB/TrEMBL.
DT 12-APR-2017, sequence version 1.
DT 13-SEP-2023, entry version 21.
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=BGN96_09760 {ECO:0000313|EMBL:OJU53240.1};
OS Bacteroidales bacterium 45-6.
OC Bacteria; Bacteroidota; Bacteroidia; Bacteroidales.
OX NCBI_TaxID=1895719 {ECO:0000313|EMBL:OJU53240.1, ECO:0000313|Proteomes:UP000185892};
RN [1] {ECO:0000313|EMBL:OJU53240.1, ECO:0000313|Proteomes:UP000185892}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=45-6 {ECO:0000313|EMBL:OJU53240.1};
RA Kantor R.S., Huddy R.J., Iyer R., Thomas B.C., Brown C.T., Anantharaman K.,
RA Tringe S., Hettich R.L., Harrison S.T., Banfield J.F.;
RT "Genome-resolved meta-omics ties microbial dynamics to process performance
RT in biotechnology for thiocyanate degradation.";
RL Submitted (SEP-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}.
CC -!- CAUTION: Lacks conserved residue(s) required for the propagation of
CC feature annotation. {ECO:0000256|HAMAP-Rule:MF_00952}.
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:OJU53240.1}.
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DR EMBL; MKRS01000305; OJU53240.1; -; Genomic_DNA.
DR AlphaFoldDB; A0A1Q3M3F1; -.
DR Proteomes; UP000185892; 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: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; DNA TOPOISOMERASE, TYPE IA, CORE; 1.
DR PANTHER; PTHR42785:SF1; OMEGA-PROTEIN; 1.
DR Pfam; PF01131; Topoisom_bac; 2.
DR Pfam; PF01751; Toprim; 1.
DR Pfam; PF13368; Toprim_C_rpt; 3.
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 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 761..796
FT /note="Disordered"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT COMPBIAS 761..785
FT /note="Basic and acidic residues"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT ACT_SITE 287
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 155
FT /note="Interaction with DNA"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00952"
FT SITE 289
FT /note="Interaction with DNA"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00952"
FT SITE 477
FT /note="Interaction with DNA"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00952"
SQ SEQUENCE 796 AA; 90088 MW; 46EE6651014D286B CRC64;
MQKNLVIVES PAKAKTIEKF LGKDYHVLSS YGHIRDLKKK DFGIDLNNSY KPQYEVPADK
KKLVAELKKA AKEAEVVWLA SDEDREGEAI SWHLYETLGL TDDRAKRIAF HEITKDAILN
AINNPRKINF NLVDAQQARR VLDRIVGFEL SPVLWKKVKP ALSAGRVQSV AVRLIVERER
EIREFQTEAA YRVVAIFVKQ ENGNTYELKA ELPQRLKTKE EALALLEKLK TADFTIDSVV
TKPTKRSPAA PFTTSTLQQE AARKLGFTVA QTMRVAQGLY ESGKITYMRT DSVNLSSLAL
NTSKAEIIAS YGEKYTHPRN YTTKSKGAQE AHEAIRPTYM SEHTVSGSAQ EKKLYDLIWK
RTIASQMADA ELEKTTVTIS VSNSDYSFVA AGEVIKFDGF LHVYMEDSDD EQPESDSHLL
PPLHKGEVLE MAETSATERF SQRPARYTEA SLVKKMEELG IGRPSTYAPT ISTIQNREYV
EKKTIEGTPR EYNVMTLKNG FIRDEKNTEI TGADKNKLFP TDTGEVVNDF LTEFFPEIMK
YNFTARLEER FDEVAEGKEN WTELIDGFYK LFHPVVNEVM NAQTEHKIGE RVLGVDPKSG
RQISVKIGRF GPMVQIGVQE EEEKPQFASL QKDQSISTIT LEEALRLFDL PRTLGEFEEK
VMTVAIGRFG PYVRHNSQFV SLPKGCDPYS ITSEEAIELI LEKRKKDSER LIKEFTEDAE
LQILNGRYGP YITHQKNNYK IPKGKEPASL TYEEVMEIIK ATPESDKKGK RTPAKKAEAK
TSKAKSTAKK KPAAGK
//