ID GYRB_SPICI Reviewed; 640 AA.
AC P34031;
DT 01-FEB-1994, integrated into UniProtKB/Swiss-Prot.
DT 01-FEB-1994, sequence version 1.
DT 08-NOV-2023, entry version 104.
DE RecName: Full=DNA gyrase subunit B {ECO:0000255|HAMAP-Rule:MF_01898};
DE EC=5.6.2.2 {ECO:0000255|HAMAP-Rule:MF_01898};
GN Name=gyrB {ECO:0000255|HAMAP-Rule:MF_01898};
OS Spiroplasma citri.
OC Bacteria; Mycoplasmatota; Mollicutes; Entomoplasmatales; Spiroplasmataceae;
OC Spiroplasma.
OX NCBI_TaxID=2133;
RN [1]
RP NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RC STRAIN=R8A2HP;
RX PubMed=7764984; DOI=10.1007/bf01570187;
RA Ye F., Renaudin J., Bove J.M., Laigret F.;
RT "Cloning and sequencing of the replication origin (oriC) of the Spiroplasma
RT citri chromosome and construction of autonomously replicating artificial
RT plasmids.";
RL Curr. Microbiol. 29:23-29(1994).
CC -!- FUNCTION: A type II topoisomerase that negatively supercoils closed
CC circular double-stranded (ds) DNA in an ATP-dependent manner to
CC modulate DNA topology and maintain chromosomes in an underwound state.
CC Negative supercoiling favors strand separation, and DNA replication,
CC transcription, recombination and repair, all of which involve strand
CC separation. Also able to catalyze the interconversion of other
CC topological isomers of dsDNA rings, including catenanes and knotted
CC rings. Type II topoisomerases break and join 2 DNA strands
CC simultaneously in an ATP-dependent manner. {ECO:0000255|HAMAP-
CC Rule:MF_01898}.
CC -!- CATALYTIC ACTIVITY:
CC Reaction=ATP-dependent breakage, passage and rejoining of double-
CC stranded DNA.; EC=5.6.2.2; Evidence={ECO:0000255|HAMAP-
CC Rule:MF_01898};
CC -!- COFACTOR:
CC Name=Mg(2+); Xref=ChEBI:CHEBI:18420;
CC Evidence={ECO:0000255|HAMAP-Rule:MF_01898};
CC Name=Mn(2+); Xref=ChEBI:CHEBI:29035;
CC Evidence={ECO:0000255|HAMAP-Rule:MF_01898};
CC Name=Ca(2+); Xref=ChEBI:CHEBI:29108;
CC Evidence={ECO:0000255|HAMAP-Rule:MF_01898};
CC Note=Binds two Mg(2+) per subunit. The magnesium ions form salt bridges
CC with both the protein and the DNA. Can also accept other divalent metal
CC cations, such as Mn(2+) or Ca(2+). {ECO:0000255|HAMAP-Rule:MF_01898};
CC -!- SUBUNIT: Heterotetramer, composed of two GyrA and two GyrB chains. In
CC the heterotetramer, GyrA contains the active site tyrosine that forms a
CC transient covalent intermediate with DNA, while GyrB binds cofactors
CC and catalyzes ATP hydrolysis. {ECO:0000255|HAMAP-Rule:MF_01898}.
CC -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000255|HAMAP-Rule:MF_01898}.
CC -!- MISCELLANEOUS: Few gyrases are as efficient as E.coli at forming
CC negative supercoils. Not all organisms have 2 type II topoisomerases;
CC in organisms with a single type II topoisomerase this enzyme also has
CC to decatenate newly replicated chromosomes. {ECO:0000255|HAMAP-
CC Rule:MF_01898}.
CC -!- SIMILARITY: Belongs to the type II topoisomerase GyrB family.
CC {ECO:0000255|HAMAP-Rule:MF_01898}.
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DR EMBL; Z19108; CAA79523.1; -; Genomic_DNA.
DR PIR; S35734; S35734.
DR AlphaFoldDB; P34031; -.
DR SMR; P34031; -.
DR STRING; 2133.SCITRI_003; -.
DR GO; GO:0005694; C:chromosome; IEA:InterPro.
DR GO; GO:0005737; C:cytoplasm; IEA:UniProtKB-SubCell.
DR GO; GO:0005524; F:ATP binding; IEA:UniProtKB-UniRule.
DR GO; GO:0003677; F:DNA binding; IEA:UniProtKB-KW.
DR GO; GO:0003918; F:DNA topoisomerase type II (double strand cut, ATP-hydrolyzing) 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 GO; GO:0006261; P:DNA-templated DNA replication; IEA:UniProtKB-UniRule.
DR CDD; cd16928; HATPase_GyrB-like; 1.
DR CDD; cd00822; TopoII_Trans_DNA_gyrase; 1.
DR CDD; cd03366; TOPRIM_TopoIIA_GyrB; 1.
DR Gene3D; 3.30.230.10; -; 1.
DR Gene3D; 3.40.50.670; -; 1.
DR Gene3D; 3.30.565.10; Histidine kinase-like ATPase, C-terminal domain; 1.
DR HAMAP; MF_01898; GyrB; 1.
DR InterPro; IPR002288; DNA_gyrase_B_C.
DR InterPro; IPR011557; GyrB.
DR InterPro; IPR003594; HATPase_C.
DR InterPro; IPR036890; HATPase_C_sf.
DR InterPro; IPR020568; Ribosomal_Su5_D2-typ_SF.
DR InterPro; IPR014721; Ribsml_uS5_D2-typ_fold_subgr.
DR InterPro; IPR001241; Topo_IIA.
DR InterPro; IPR013760; Topo_IIA-like_dom_sf.
DR InterPro; IPR000565; Topo_IIA_B.
DR InterPro; IPR013759; Topo_IIA_B_C.
DR InterPro; IPR013506; Topo_IIA_bsu_dom2.
DR InterPro; IPR018522; TopoIIA_CS.
DR InterPro; IPR006171; TOPRIM_domain.
DR InterPro; IPR034160; TOPRIM_GyrB.
DR NCBIfam; TIGR01059; gyrB; 1.
DR PANTHER; PTHR45866:SF1; DNA GYRASE SUBUNIT B, MITOCHONDRIAL; 1.
DR PANTHER; PTHR45866; DNA GYRASE/TOPOISOMERASE SUBUNIT B; 1.
DR Pfam; PF00204; DNA_gyraseB; 1.
DR Pfam; PF00986; DNA_gyraseB_C; 1.
DR Pfam; PF02518; HATPase_c; 1.
DR Pfam; PF01751; Toprim; 1.
DR PRINTS; PR01159; DNAGYRASEB.
DR PRINTS; PR00418; TPI2FAMILY.
DR SMART; SM00387; HATPase_c; 1.
DR SMART; SM00433; TOP2c; 1.
DR SUPFAM; SSF55874; ATPase domain of HSP90 chaperone/DNA topoisomerase II/histidine kinase; 1.
DR SUPFAM; SSF54211; Ribosomal protein S5 domain 2-like; 1.
DR SUPFAM; SSF56719; Type II DNA topoisomerase; 1.
DR PROSITE; PS00177; TOPOISOMERASE_II; 1.
DR PROSITE; PS50880; TOPRIM; 1.
PE 3: Inferred from homology;
KW ATP-binding; Cytoplasm; DNA-binding; Isomerase; Magnesium; Metal-binding;
KW Nucleotide-binding; Topoisomerase.
FT CHAIN 1..640
FT /note="DNA gyrase subunit B"
FT /id="PRO_0000145336"
FT DOMAIN 423..537
FT /note="Toprim"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01898"
FT BINDING 429
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="1"
FT /ligand_note="catalytic"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01898"
FT BINDING 502
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="1"
FT /ligand_note="catalytic"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01898"
FT BINDING 502
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="2"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01898"
FT BINDING 504
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="2"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01898"
FT SITE 454
FT /note="Interaction with DNA"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01898"
FT SITE 457
FT /note="Interaction with DNA"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01898"
SQ SEQUENCE 640 AA; 72763 MW; A7403DE2B098D25A CRC64;
MGDNYNSESI QILEGLEAIR KRPGMYIGAT NARGLHHLVW EIVDNSIDEV LANFANKIKI
ILNKDESITV IDNGRGIPIE IHPKTKVSTL ETVFTILHAG GKFDSNTYKI SGGLHGVGAS
VVNALSKYLK VEVRKNNKKY VMEFHNGGQI LTPIKEVGST SETGTTVTFL PDEKIFKETT
IFSFSTIQNR IKQLVFLNKG LEISLVDLRE EDEEKTVLYQ FNNGIKDYVL ELNKTIGTPL
NDVFYVEGIE DNIVVEFGLQ YNDNYSENIF SFCNNINTHE GGTHEEGARL AIVREINNYF
KNQINKNNKG NEDKFTWDDI KEGMTIIISI RHPEPQYEGQ TNQKLLNSEV KKIVSNIVGK
GLSSYLLENP EDAKKIIEKI SLSLKATIVA QRAKEITRRK IVMDSFSLPG KLSDCETKDA
KIAELYIVEG DSAGGSAKSG RNRKFQAILP LRGKILNVEK AKQIKIFENN EINSIITALG
AGIKDNFNDK KLRYQKVIIM TDADVDGAHI RILLLTFFYR YMKDLIENGN IYIAQPPLYK
VENSNQIRYV YSDNELELYK EELLKQNKNY TIQRYKGLGE MNPEQLWETT MDPERRLLLK
VSVNNAFEAN LICNELMGEN VEPRKKFIRE NAKYVKNLDV
//
