ID   A0A0A7ECG3_9GAMM        Unreviewed;       805 AA.
AC   A0A0A7ECG3;
DT   04-MAR-2015, integrated into UniProtKB/TrEMBL.
DT   04-MAR-2015, sequence version 1.
DT   17-FEB-2016, entry version 11.
DE   RecName: Full=DNA gyrase subunit B {ECO:0000256|HAMAP-Rule:MF_01898, ECO:0000256|SAAS:SAAS00504111};
DE            EC=5.99.1.3 {ECO:0000256|HAMAP-Rule:MF_01898, ECO:0000256|SAAS:SAAS00470646};
GN   Name=gyrB {ECO:0000256|HAMAP-Rule:MF_01898,
GN   ECO:0000313|EMBL:AIY64279.1};
GN   ORFNames=OM33_03245 {ECO:0000313|EMBL:AIY64279.1};
OS   Pseudoalteromonas sp. OCN003.
OC   Bacteria; Proteobacteria; Gammaproteobacteria; Alteromonadales;
OC   Pseudoalteromonadaceae; Pseudoalteromonas.
OX   NCBI_TaxID=1348114 {ECO:0000313|EMBL:AIY64279.1, ECO:0000313|Proteomes:UP000030341};
RN   [1] {ECO:0000313|EMBL:AIY64279.1, ECO:0000313|Proteomes:UP000030341}
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=OCN003 {ECO:0000313|EMBL:AIY64279.1,
RC   ECO:0000313|Proteomes:UP000030341};
RA   Beurmann S., Videau P., Ushijima B., Smith A.M., Aeby G.S.,
RA   Callahan S.M., Belcaid M.;
RT   "Complete Genome Sequence of Pseudoalteromonas sp. Strain OCN003
RT   Isolated from Kaneohe Bay, Oahu, Hawaii.";
RL   Submitted (NOV-2014) to the EMBL/GenBank/DDBJ databases.
CC   -!- FUNCTION: A type II topoisomerase that negatively supercoils
CC       closed circular double-stranded (ds) DNA in an ATP-dependent
CC       manner to modulate DNA topology and maintain chromosomes in an
CC       underwound state. Negative supercoiling favors strand separation,
CC       and DNA replication, transcription, recombination and repair, all
CC       of which involve strand separation. Also able to catalyze the
CC       interconversion of other topological isomers of dsDNA rings,
CC       including catenanes and knotted rings. Type II topoisomerases
CC       break and join 2 DNA strands simultaneously in an ATP-dependent
CC       manner. {ECO:0000256|HAMAP-Rule:MF_01898}.
CC   -!- CATALYTIC ACTIVITY: ATP-dependent breakage, passage and rejoining
CC       of double-stranded DNA. {ECO:0000256|HAMAP-Rule:MF_01898,
CC       ECO:0000256|SAAS:SAAS00470725}.
CC   -!- COFACTOR:
CC       Name=Mg(2+); Xref=ChEBI:CHEBI:18420; Evidence={ECO:0000256|HAMAP-
CC         Rule:MF_01898};
CC       Name=Mn(2+); Xref=ChEBI:CHEBI:29035; Evidence={ECO:0000256|HAMAP-
CC         Rule:MF_01898};
CC       Name=Ca(2+); Xref=ChEBI:CHEBI:29108; Evidence={ECO:0000256|HAMAP-
CC         Rule:MF_01898};
CC       Note=Binds two Mg(2+) per subunit. The magnesium ions form salt
CC       bridges with both the protein and the DNA. Can also accept other
CC       divalent metal cations, such as Mn(2+) or Ca(2+).
CC       {ECO:0000256|HAMAP-Rule:MF_01898};
CC   -!- SUBUNIT: Heterotetramer, composed of two GyrA and two GyrB chains.
CC       In the heterotetramer, GyrA contains the active site tyrosine that
CC       forms a transient covalent intermediate with DNA, while GyrB binds
CC       cofactors and catalyzes ATP hydrolysis. {ECO:0000256|HAMAP-
CC       Rule:MF_01898}.
CC   -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000256|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
CC       topoisomerases; in organisms with a single type II topoisomerase
CC       this enzyme also has to decatenate newly replicated chromosomes.
CC       {ECO:0000256|HAMAP-Rule:MF_01898}.
CC   -!- SIMILARITY: Belongs to the type II topoisomerase family.
CC       {ECO:0000256|HAMAP-Rule:MF_01898}.
CC   -!- SIMILARITY: Contains 1 Toprim domain. {ECO:0000256|HAMAP-
CC       Rule:MF_01898}.
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DR   EMBL; CP009888; AIY64279.1; -; Genomic_DNA.
DR   RefSeq; WP_038638712.1; NZ_CP009888.1.
DR   EnsemblBacteria; AIY64279; AIY64279; OM33_03245.
DR   KEGG; pseo:OM33_03245; -.
DR   KO; K02470; -.
DR   Proteomes; UP000030341; Chromosome 1.
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-HAMAP.
DR   GO; GO:0003677; F:DNA binding; IEA:UniProtKB-HAMAP.
DR   GO; GO:0003918; F:DNA topoisomerase type II (ATP-hydrolyzing) activity; IEA:UniProtKB-HAMAP.
DR   GO; GO:0000287; F:magnesium ion binding; IEA:UniProtKB-HAMAP.
DR   GO; GO:0006265; P:DNA topological change; IEA:InterPro.
DR   GO; GO:0006261; P:DNA-dependent DNA replication; IEA:UniProtKB-HAMAP.
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; IPR003594; HATPase_C.
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.
DR   InterPro; IPR013506; Topo_IIA_bsu_dom2.
DR   InterPro; IPR013759; Topo_IIA_cen_dom.
DR   InterPro; IPR018522; TopoIIA_CS.
DR   InterPro; IPR006171; Toprim_domain.
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; PR00418; TPI2FAMILY.
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; 2.
DR   TIGRFAMs; TIGR01059; gyrB; 1.
DR   PROSITE; PS00177; TOPOISOMERASE_II; 1.
DR   PROSITE; PS50880; TOPRIM; 1.
PE   3: Inferred from homology;
KW   ATP-binding {ECO:0000256|HAMAP-Rule:MF_01898,
KW   ECO:0000256|SAAS:SAAS00470817}; Coiled coil {ECO:0000256|SAM:Coils};
KW   Complete proteome {ECO:0000313|Proteomes:UP000030341};
KW   Cytoplasm {ECO:0000256|HAMAP-Rule:MF_01898};
KW   DNA-binding {ECO:0000256|HAMAP-Rule:MF_01898};
KW   Isomerase {ECO:0000256|HAMAP-Rule:MF_01898,
KW   ECO:0000256|SAAS:SAAS00470744};
KW   Magnesium {ECO:0000256|HAMAP-Rule:MF_01898};
KW   Metal-binding {ECO:0000256|HAMAP-Rule:MF_01898};
KW   Nucleotide-binding {ECO:0000256|HAMAP-Rule:MF_01898,
KW   ECO:0000256|SAAS:SAAS00470788};
KW   Reference proteome {ECO:0000313|Proteomes:UP000030341};
KW   Topoisomerase {ECO:0000256|HAMAP-Rule:MF_01898,
KW   ECO:0000256|SAAS:SAAS00470796}.
FT   DOMAIN      419    534       Toprim. {ECO:0000259|PROSITE:PS50880}.
FT   COILED      581    601       {ECO:0000256|SAM:Coils}.
FT   METAL       425    425       Magnesium 1; catalytic.
FT                                {ECO:0000256|HAMAP-Rule:MF_01898}.
FT   METAL       499    499       Magnesium 1; catalytic.
FT                                {ECO:0000256|HAMAP-Rule:MF_01898}.
FT   METAL       499    499       Magnesium 2. {ECO:0000256|HAMAP-Rule:
FT                                MF_01898}.
FT   METAL       501    501       Magnesium 2. {ECO:0000256|HAMAP-Rule:
FT                                MF_01898}.
FT   SITE        450    450       Interaction with DNA. {ECO:0000256|HAMAP-
FT                                Rule:MF_01898}.
FT   SITE        453    453       Interaction with DNA. {ECO:0000256|HAMAP-
FT                                Rule:MF_01898}.
SQ   SEQUENCE   805 AA;  89794 MW;  401E1512C37E5E89 CRC64;
     MSENYDSSSI KVLKGLDAVR KRPGMYIGDT DDGTGLHHMV FEVVDNSIDE ALAGYCDDVY
     VTIHSDGSVS VRDNGRGIPT EIHEEEGVSA AEVIMTVLHA GGKFDDNSYK VSGGLHGVGV
     SVVNALSEKL KLTIRRGGKI HEQTYNMGEP AAPLAVVGDS ETNGTEIRFW PSAETFSDTN
     FHYDILAKRL RELSFLNSGV SIILSDERDE KRDHFKYEGG IQAFVEFLNT NKTPVNQNVF
     HFTSTREEDG ISVEVAMQWN DGFQEGIYCF TNNIPQRDGG THLAGFRSAL TRTLNTYMDK
     EGFNKKEKSS ASGDDAREGL TAVISVKVPD PKFSSQTKDK LVSSEVKSAV EQAMGEKLSE
     YLLENPQDAK IVVTKIIDAA RAREAARKAR EMTRRKGAMD LAGLPGKLAD CQEKDPALSE
     LYIVEGDSAG GSAKQGRNRK NQAILPLKGK ILNVEKARFD KMLSSQEVAT LITALGCGIG
     RDEYNPEKLR YHSIIIMTDA DVDGSHIRTL LLTFFYRQMP EIVERGYVYI AQPPLYKVKK
     GKQERYIKDD PALTEYLTTL ALDGSSLHVN EEAPGISDVA LEALVKDYQA TEAIITRLTR
     KYPLSVLNSL IYSTRINEAD LADEAKVRTW TESVVAYLTE KDVDATLFTA EVKKDEERNL
     FYPNIVIRQH GVDREHVLNY EFLTSRDYLS IAKTGEQIGN LIEEGGYIQR GEKTLQVSSF
     VEALDWLISE SKRGLYIQRY KGLGEMNPDQ LWETTMDPEV RRMLKVTIED AIGADQLFST
     LMGDQVEPRR DFIEQNALKV VNLDV
//