GYRB_BUCBP
ID GYRB_BUCBP Reviewed; 804 AA.
AC Q89B37;
DT 23-MAY-2003, integrated into UniProtKB/Swiss-Prot.
DT 23-MAY-2003, sequence version 1.
DT 03-AUG-2022, entry version 118.
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}; OrderedLocusNames=bbp_010;
OS Buchnera aphidicola subsp. Baizongia pistaciae (strain Bp).
OC Bacteria; Proteobacteria; Gammaproteobacteria; Enterobacterales;
OC Erwiniaceae; Buchnera.
OX NCBI_TaxID=224915;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=Bp;
RX PubMed=12522265; DOI=10.1073/pnas.0235981100;
RA van Ham R.C.H.J., Kamerbeek J., Palacios C., Rausell C., Abascal F.,
RA Bastolla U., Fernandez J.M., Jimenez L., Postigo M., Silva F.J.,
RA Tamames J., Viguera E., Latorre A., Valencia A., Moran F., Moya A.;
RT "Reductive genome evolution in Buchnera aphidicola.";
RL Proc. Natl. Acad. Sci. U.S.A. 100:581-586(2003).
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; AE016826; AAO26754.1; -; Genomic_DNA.
DR RefSeq; WP_011091155.1; NC_004545.1.
DR AlphaFoldDB; Q89B37; -.
DR SMR; Q89B37; -.
DR STRING; 224915.bbp_010; -.
DR PRIDE; Q89B37; -.
DR EnsemblBacteria; AAO26754; AAO26754; bbp_010.
DR GeneID; 56470554; -.
DR KEGG; bab:bbp_010; -.
DR eggNOG; COG0187; Bacteria.
DR HOGENOM; CLU_006146_0_1_6; -.
DR OMA; LWETTMH; -.
DR OrthoDB; 205481at2; -.
DR Proteomes; UP000000601; Chromosome.
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; cd03366; TOPRIM_TopoIIA_GyrB; 1.
DR Gene3D; 3.30.230.10; -; 1.
DR Gene3D; 3.30.565.10; -; 1.
DR Gene3D; 3.40.50.670; -; 2.
DR HAMAP; MF_01898; GyrB; 1.
DR InterPro; IPR002288; DNA_gyrase_B_C.
DR InterPro; IPR011557; GyrB.
DR InterPro; IPR041423; GyrB_insert.
DR InterPro; IPR003594; HATPase_C.
DR InterPro; IPR036890; HATPase_C_sf.
DR InterPro; IPR020568; Ribosomal_S5_D2-typ_fold.
DR InterPro; IPR014721; Ribosomal_S5_D2-typ_fold_subgr.
DR InterPro; IPR001241; Topo_IIA.
DR InterPro; IPR013760; Topo_IIA-like_dom_sf.
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 Pfam; PF00204; DNA_gyraseB; 1.
DR Pfam; PF00986; DNA_gyraseB_C; 1.
DR Pfam; PF18053; GyrB_insert; 1.
DR Pfam; PF02518; HATPase_c; 1.
DR Pfam; PF01751; Toprim; 1.
DR SMART; SM00387; HATPase_c; 1.
DR SMART; SM00433; TOP2c; 1.
DR SUPFAM; SSF54211; SSF54211; 1.
DR SUPFAM; SSF55874; SSF55874; 1.
DR SUPFAM; SSF56719; SSF56719; 1.
DR TIGRFAMs; TIGR01059; gyrB; 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; Reference proteome; Topoisomerase.
FT CHAIN 1..804
FT /note="DNA gyrase subunit B"
FT /id="PRO_0000145300"
FT DOMAIN 418..533
FT /note="Toprim"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01898"
FT BINDING 424
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 498
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 498
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="2"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01898"
FT BINDING 500
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="2"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01898"
FT SITE 449
FT /note="Interaction with DNA"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01898"
FT SITE 452
FT /note="Interaction with DNA"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01898"
SQ SEQUENCE 804 AA; 92732 MW; EB654792BCA8F15D CRC64;
MKNTYTSSNI KILKGLDAVK KRPGMYIGNT DDGTGLHHMV FEVVDNSIDE ALAGFCKNII
VTIHDDNSIS IQDDGRGIPT DIHDEEGISA AEVIMTVLHA GGKFDNTSYK VSGGLHGVGV
SVVNALSKKL ELFIYRDKKI YYQIYKNGYP KNTLSIIGYT KITGTKIRFW PNLEIFTNVT
QFNWEILSKR LRELSFLNSN VSIYLDDAKK HINENFYQQG GLKEFIIYLN KNKKPIHSKI
FYFSSKKNNV EVEIAMQWNK GFQENIYCYT NNIPQQDGGT HLSGFRSALT RTMNNYLDKE
GYIKKNKINI IGDDTREGLT AIISIKINDP KFSSQTKNKL VSSEVKSALE SLVNEFLMEF
LLENPQESKN IVTKIIESSR VRNAARRARE MTRKKGTLDL IGLPGKLSDC QERDPALSEI
YLVEGDSAGG SAKQARNRKN QAILPLKGKI LNVEKARYEK MLSSQEVTTL ITALGCGIGK
NEYNPEKLRY HRIIIMTDAD VDGSHIRTLL LTFFYRYMPE IIQRGYLYIA QPPLYKVTKN
NKTRYIKDKN TMENYKLSTA LENTILESNT DKEIKIKCNY TLKKIISEYK IIQTIFFKIK
DNFPLNILNE MLYHPKLNNL NDEVYVNNWI NNFVIQLQKK SSSTRNYSAH ITFNSKDKIF
EPLIKIQKNA EVKEYKFDIT FINSYEYQKI YSLGKKLQEM IQKNIHIKKN NKTYSIKNFQ
KNFELLIQNS FKNVLIQRYK GLGEMNPEQL WKTTMNPETR RMLKITLHNI DTTNKLFNTL
MGDSVEPRKL FIELYALKAS NIDI
