ID A0A2I9E382_9FLAO Unreviewed; 829 AA.
AC A0A2I9E382;
DT 25-APR-2018, integrated into UniProtKB/TrEMBL.
DT 25-APR-2018, sequence version 1.
DT 27-MAR-2024, entry version 32.
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 ECO:0000313|EMBL:GBF22000.1};
GN ORFNames=C21_04191 {ECO:0000313|EMBL:GBF22000.1};
OS Arenibacter sp. NBRC 103722.
OC Bacteria; Bacteroidota; Flavobacteriia; Flavobacteriales;
OC Flavobacteriaceae; Arenibacter.
OX NCBI_TaxID=1113929 {ECO:0000313|EMBL:GBF22000.1, ECO:0000313|Proteomes:UP000095208};
RN [1] {ECO:0000313|EMBL:GBF22000.1}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=C-21 {ECO:0000313|EMBL:GBF22000.1};
RA Ito K., Nakajima N., Yamamura S., Tomita M., Suzuki H., Amachi S.;
RT "Draft Genome Sequence of Arenibacter sp. Strain C-21, an Iodine-
RT Accumulating Bacterium Isolated from Surface Marine Sediment.";
RL Genome Announc. 4:e01155-16(2016).
RN [2] {ECO:0000313|EMBL:GBF22000.1}
RP NUCLEOTIDE SEQUENCE.
RC STRAIN=C-21 {ECO:0000313|EMBL:GBF22000.1};
RA Gaut B.S., Morton B.R., Clegg M.T., Duvall M.R.;
RL Submitted (JAN-2018) 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: 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:GBF22000.1}.
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DR EMBL; BDGL02000028; GBF22000.1; -; Genomic_DNA.
DR RefSeq; WP_031445426.1; NZ_BDGL02000028.1.
DR AlphaFoldDB; A0A2I9E382; -.
DR Proteomes; UP000095208; 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; 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_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; 1.
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 Reference proteome {ECO:0000313|Proteomes:UP000095208};
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 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 475
FT /note="Interaction with DNA"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00952"
SQ SEQUENCE 829 AA; 93645 MW; B3E131755E98E507 CRC64;
MAKNLVIVES PAKAKTIEKF LGKEYKVESS FGHIADLPSK ELGVDVDNNF APKYIVDKDK
KALVKKLKDL ADKADTIWLA SDEDREGEAI SWHLAEELKL DKNKTKRIVF NSITKSAIQK
AIENPREINY DLVNAQQARR ILDRLVGYEL SPVLWKKIKP GLSAGRVQSV AVRLIVERER
EIEAFNPEAA FKISAEFKTN EGSIFTAKLN KTYVSQKEAE AFLKENIGAN FSVASLDKKP
AKKSPAAPFT TSTLQQEASR KLYFSVSRTM QVAQRLYEAG LITYMRTDSV NLSKDAIDAA
KDAIISNYGK EYSKVRNFTG KSKGAQEAHE AIRPTEMTNQ SPSLERDQSK LYELIWKRTL
ASQMSDAELE RTNVKIKANT HKEEFTANGE VIKFDGFLKV YLEGTDDEDI SEEQEGMLPA
LKEGEKLHNN YITATERFSR APYRFTEASL VKKLEELGIG RPSTYAPTIS TIQNRGYVEK
GTVEGTERNY VQLLLKSDKL TTKDLKENVG SDKGKMVPTD IGIIVTDFLV GHFETILDYH
FTAKVEEDFD EIASGDEDWQ KVLKNFYGDF HPKVLDVEEN ADRASGERVL GTDPKTGRQV
SVRLGRFGPM VQVGTVDDEE KPLFASLLPD QSLNTISYEE AMDLFKLPRK LGVYEGEDVE
ANVGRFGPYI RFGKKFVSLG KDENAMEIDM DRAVELIKEK QKADAPIAIY ENKEVTKGVG
RFGPFIKWDG MFINVSKKYD FDTLSKQDIE EIIEAKKQKE IDKLVQEWPE EGIRIEKARW
GRHSIIKGKI KVEVSKDVDA TKISLKDAQE LIEKKTPKKK TKAKPKAKK
//
