>TIGR01063 gyrA DNA gyrase, A subunit; InterPro: IPR005743 DNA topoisomerases regulate the number of topological links between two DNA strands (i.e. change the number of superhelical turns) by catalysing transient single- or double-strand breaks, crossing the strands through one another, then resealing the breaks. These enzymes have several functions: to remove DNA supercoils during transcription and DNA replication; for strand breakage during recombination; for chromosome condensation; and to disentangle intertwined DNA during mitosis , . DNA topoisomerases are divided into two classes: type I enzymes (5.99.1.2 from EC; topoisomerases I, III and V) break single-strand DNA, and type II enzymes (5.99.1.3 from EC; topoisomerases II, IV and VI) break double-strand DNA . Type II topoisomerases are ATP-dependent enzymes, and can be subdivided according to their structure and reaction mechanisms: type IIA (topoisomerase II or gyrase, and topoisomerase IV) and type IIB (topoisomerase VI). These enzymes are responsible for relaxing supercoiled DNA as well as for introducing both negative and positive supercoils . Topoisomerase II (called gyrase in bacteria) primarily introduces negative supercoils into DNA. In bacteria, topoisomerase II consists of two polypeptide subunits, gyrA and gyrB, which form a heterotetramer: (BA)2. In most eukaryotes, topoisomerase II consists of a single polypeptide, where the N- and C-terminal regions correspond to gyrB and gyrA, respectively. This entry represents the A subunit (gyrA) as found predominantly in bacteria, but does not include the topoisomerase II enzymes composed of a single polypeptide, as are found in most eukaryotes. GyrA has two functional domains: an N-terminal that forms the covalent DNA-protein bridge that is responsible for the breaking- and rejoining function, and a C-terminal that can bind DNA non-specifically . More information about this protein can be found at Protein of the Month: DNA Topoisomerase .; GO: 0003677 DNA binding, 0003918 DNA topoisomerase (ATP-hydrolyzing) activity, 0005524 ATP binding, 0006265 DNA topological change, 0006268 DNA unwinding during replication, 0005694 chromosome.

Probab=100.00 E-value=0 Score=2307.74 Aligned_cols=727 Identities=40% Similarity=0.648 Sum_probs=702.8 Q ss_pred EEECCHHHHHHHHHHHHHHHHHHHCCCCCCCCCCCHHHHHHHHHHHHCCCCCCCCEEEEEHHHHHHHCCCCCCHHHHHHH Q ss_conf 66531999999888888899985104764112897046899999998689998980354053666542768874789999 Q gi|254780353|r 17 VKAVSLRFALEERYLAYALSTIKERAIPDLRDGFKPVHRRIIHAMSEMGLDFGAAFKKSARIVGEVIGKLHPHGDQSVYD 96 (753) Q Consensus 17 i~~~~i~~~~~~~y~~ya~~vi~~Ralpd~~DGlKpvqRril~~m~~~~~~~~~~~~K~ar~vg~v~gkyhPHGd~s~y~ 96 (753) T Consensus 1 i~pv~ie~E~k~SYLdYAMSVIVsRALPDvRDGLKPVHRRiLYaM~~~Gl~~d~~~kKsARIVGDV~GkYHPHGD~aiYD 80 (864) T TIGR01063 1 IVPVNIEEEMKRSYLDYAMSVIVSRALPDVRDGLKPVHRRILYAMYELGLTPDKPYKKSARIVGDVLGKYHPHGDSAIYD 80 (864) T ss_pred CCCCCHHHHHHHHHHHHHHHHHHHHCCCCCCCCCCCHHHHHHHHHHHCCCCCCCCEEECCEEEEEECCCCCCCCCCHHHH T ss_conf 94565788999998644111322211541003688504577667766278998866002428741047824898734676 Q ss_pred HHHHHCCHHHCCCCCCCCCCCCCCCCCCCCCCHHHHHHHHHHHHHHHHHHCCCCCCCCCCCCCCCEEEEEEECCCCCHHH Q ss_conf 99961001321661326788708867797100246899855999999842187861752167996324223123452676 Q gi|254780353|r 97 SLVRLAQPFVQRYPLISGQGNFGNIDGDSAAAYRYTEARMTQVAELILQGVDEDAVDFRDTYNEEDSEPVVFPSKFPNLL 176 (753) Q Consensus 97 a~v~maq~~~~~~pli~g~GnfGs~~~d~~Aa~RYte~rl~~~~~~ll~di~~~~v~~~~n~D~~~~EP~~lp~~~P~lL 176 (753) T Consensus 81 ~LVRMAQDFSlRYpLvDGQGNFGSiDGD~pAAMRYTEaRl~k~a~~ll~DIdKeTVdF~~NYDg~~~EP~VLPs~fPnLL 160 (864) T TIGR01063 81 ALVRMAQDFSLRYPLVDGQGNFGSIDGDPPAAMRYTEARLTKIAEELLRDIDKETVDFVPNYDGSEKEPTVLPSRFPNLL 160 (864) T ss_pred HHHHHCCCHHHCCCCCCCCCCCCCCCCCCHHHHHHHHHHHHHHHHHHHHHCCCCCCCCCCCCCCCCCCCCCCCCCCCHHH T ss_conf 77650587100354416888647888882676521788888999999862043631654488886258820751241456 Q ss_pred HCCCCCHHHHHHHHCCCCCHHHHHHHHHHHHHCCCCCCHHHHHHCCCCCCCCCCCCCCCHHHHHHHHHCCCCEEEEEEEE Q ss_conf 42665046777751677788999999999872865320134432036778877601069889998985033415999999 Q gi|254780353|r 177 ANGTSGIAVGMATSIPSHNVQEICEAALALIDNPEISIEKLLEYIIGPDFPTGGIIVESRESIVESYRLGRGGFRVRARW 256 (753) Q Consensus 177 ~Ng~~GIavG~at~ipphnl~ev~~a~~~~i~~~~~~~~~l~~~i~gPDFPTGG~i~~~~~~i~~~y~tG~G~i~~r~k~ 256 (753) T Consensus 161 vNGSsGIAVGMATNIPPHNL~Eiida~~~~i~Np~~~i~eLl~~i~GPDFPTgg~I~-G~~GI~~AY~TGRG~i~~Rar~ 239 (864) T TIGR01063 161 VNGSSGIAVGMATNIPPHNLGEIIDAILAYIDNPDISIEELLEVIKGPDFPTGGIIL-GRSGIREAYETGRGSIVIRARA 239 (864) T ss_pred CCCCCCCCCCCCCCCCCCCHHHHHHHHHHHHCCCCCCHHHHHCCCCCCCCCHHHHHC-CCCCHHHHHHCCCCEEEEEEEE T ss_conf 132476000222578873368999999998718998867995607711371056430-5001377733588138999989 Q ss_pred EEEECCC--CCEEEEEECCCCCCCHHHHHHHHHHHHHHCCCHHHHHHHHCC-CCCEEEEEEEECCCCCHHHHHHHHHHHC Q ss_conf 9864378--840799952420021689999999986402221345776406-7660588985045458899999875420 Q gi|254780353|r 257 CVEEVGR--GSWCIVVTEIPYQVQKSRLIEKIAELIIAKRIPLLEDIRDES-AEDVRIVLFPKNRSLDPDLLMESIFMLS 333 (753) Q Consensus 257 ~~e~~~~--~~~~ivIteiPy~v~k~~~ie~I~~lv~~~ki~gi~dirDeS-d~~~~~vi~~~~r~~~~~~vl~~Lyk~T 333 (753) T Consensus 240 ~iE~~~~~~gR~~IIvTE~PYqVNKa~LiekIAeLv~ek~ieGIsdiRDESSDr~GiRiVIE~KRD~~a~VvLN~LYk~T 319 (864) T TIGR01063 240 EIEEDSKKGGREAIIVTEIPYQVNKARLIEKIAELVREKKIEGISDIRDESSDREGIRIVIELKRDAVAEVVLNNLYKQT 319 (864) T ss_pred EEEECCCCCCCCEEEEECCCCCCHHHHHHHHHHHHHHCCCCCCCCCCCCCCCCCCCCEEEEEEECCCCCCHHHHHHHCCC T ss_conf 99864889986248886288852026888999987400000032124425668774379999742898301542121126 Q ss_pred CCCCCCCCCEEEEECCCCCCCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCC-- Q ss_conf 000122331133312689722049999998999989999999999999999999999999986410789999752000-- Q gi|254780353|r 334 DMETRFPLNMNVLSMGRVPQVMPLDGILKEWLAHRREVLFRRSSFRMQAIDRRVEILKGLLIAYLNIDEIIAIIRNED-- 411 (753) Q Consensus 334 ~Lq~sf~~N~~~l~~~~~P~~~~l~eil~~f~~~R~~vi~rr~~~~L~k~~~RlhIleGl~~a~~~ID~vI~iIR~s~-- 411 (753) T Consensus 320 ~lQ~~Fg~NmLALv~G-~Pk~lnLk~~l~~f~~HR~~Vi~RRT~feLrKA~eRaHiL~GL~~AL~niDevI~lIr~S~~~ 398 (864) T TIGR01063 320 QLQVSFGINMLALVDG-LPKVLNLKELLEAFVEHRKDVITRRTIFELRKAEERAHILEGLLIALDNIDEVIALIRASQNT 398 (864) T ss_pred CCCEECCEEEEEEECC-CCCEECHHHHHHHHHHCCEEEEEEEHHCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCCCH T ss_conf 4500148123211078-975017889999998423133552100010226557899999999997212899997427898 Q ss_pred -CCCCCCCCC------------------------CCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHC Q ss_conf -011000000------------------------2577577889988789999889999766678999988776544203 Q gi|254780353|r 412 -KPKPVMVSR------------------------FSLTENQVDAILNLRLRSLRKLEEYQIKSELDNLLAEKEKIDSLLN 466 (753) Q Consensus 412 -~~k~~L~~~------------------------f~lse~QA~aIL~mrL~rLt~le~~kl~~E~~eL~~~i~~L~~IL~ 466 (753) T Consensus 399 ~~Ak~~L~e~~W~l~di~~ll~~~~~~~l~~~g~F~l~E~QA~AILdMrL~rLTgLE~~Kl~~E~~~L~~~I~~l~~iL~ 478 (864) T TIGR01063 399 EEAKTRLVERQWELLDILPLLKLVLEVELGERGTFSLSEIQAQAILDMRLQRLTGLEREKLEEEYKELLELIADLEDILA 478 (864) T ss_pred HHHHHHHHCCCCCHHHHHHHHHHHHHHHCCCCCCCCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCC T ss_conf 89998842168607899999988767532888865448899999999887677888899999999999999999997503 Q ss_pred CHHHHHHHHHHHHHHHHHHCCCCCCCCCCCCCEEECCCHHHHHHHHCCCCCCCCEEEEECCCEEEC--------CCCCCC Q ss_conf 978878999999999987417743345554200001100000011002456670599871010202--------565544 Q gi|254780353|r 467 SGKQQWNQIACEIREVKEIFSKSTDLGRRRTTFCEVSRADKATLQQAMIEKEPITVVISNRGWIRS--------LKSHSV 538 (753) Q Consensus 467 s~~~l~~iI~~EL~eikkkfgd~~~~~~RRT~iie~~~~~~~~~~EdlI~~E~v~V~LS~~GyIKr--------~k~~~~ 538 (753) T Consensus 479 ~~~r~~~iireEL~~i~~~Fgd~-----RRT~I~~~~--~~~~D~EDLI~~E~vVvt~s~~GYvKR~p~~~Y~~Q~RGGk 551 (864) T TIGR01063 479 SEERVLEIIREELEEIKEQFGDP-----RRTEIVAEE--SEDIDIEDLIARENVVVTLSHKGYVKRVPVSAYRSQKRGGK 551 (864) T ss_pred CHHHHHHHHHHHHHHHHHHHCCC-----CCCHHHHCC--CCCCCCHHHHCCCCEEEEEECCCEEEECCHHHHHCCCCCCC T ss_conf 77689999999999999973885-----321222024--32245034414787899971686478603013325766664 Q ss_pred CCCCCCCCC-CCCCEEEEEECCCCCEEEEECCCEEEEEEHHHCCCC--CCCCCCCCCCCC-CCCCCEEEEEEE---ECCC Q ss_conf 553223455-555401211114781789806882787551121212--344442222357-676530789998---5799 Q gi|254780353|r 539 DLSALHFKE-GDSLKIALHAHTTDRILLLSTDGKAYTLPAGNLLSG--RGHGEAIQLLID-LNHNQDIVTAFV---YDST 611 (753) Q Consensus 539 ~~~~~~~Ke-gD~l~~~~~~~t~d~LLffTs~GkvY~l~a~~Ips~--~~kG~pI~~ll~-l~~~EkIv~~~~---~~~~ 611 (753) T Consensus 552 G~~g~~~~~G~D~i~~~lvasTHD~~Lfftn~G~vY~lK~Y~iP~~~R~akG~pIvNLL~G~~~dE~I~ai~~v~~f~d~ 631 (864) T TIGR01063 552 GVSGADLKDGDDFIEQLLVASTHDYLLFFTNRGKVYRLKVYQIPEASRTAKGKPIVNLLEGLQKDERITAILSVKEFEDE 631 (864) T ss_pred CCCCCCCCCCCCEEEEEEEEECCCEEEEEECCCCEEEEEEEECCCCCCCCCCCHHHHHCCCCCCCCEEEEEECCCCCCCC T ss_conf 64325312368505677883077607888188826864544178777567871288860578767668887356666855 Q ss_pred C---EEEEEECCCCEEEEEHHHHHCCCCCCEEEEEECCCCCEEEEEECCC-CE-EEEEECCCCEEEEEHH--HCCCCCH- Q ss_conf 8---5999974897899638874023335627885368980568896189-80-9999569938995578--7783361- Q gi|254780353|r 612 C---KLLVVSSKGNAFIVEESEIIANTRKGKTFLKVSSEEKMKLVVKVTG-DH-VAVVGENRKLLIFSID--QIPEMSR- 683 (753) Q Consensus 612 ~---~lll~Tk~G~ikr~~l~~~~~~~k~Gk~~ikLk~~D~li~v~~~~~-d~-iiliT~~Gk~LrF~~~--eIr~~gR- 683 (753) T Consensus 632 ~~~~yl~~aTk~G~vKk~~L~~F~~~rs~GiiAi~L~e~D~L~~v~~~~~~~~~v~l~s~~G~~~RF~~~~~~vR~mgR~ 711 (864) T TIGR01063 632 AYDLYLFLATKNGVVKKTSLTEFSNIRSNGIIAIKLDEGDELISVRLVDGDDEKVMLGSKNGKAVRFPEEDEEVREMGRA 711 (864) T ss_pred CCCEEEEEECCCCEEEEEECHHHHHHHHCCEEEEEEECCCEEEEEEEEECCCCEEEEEECCCCEEECCCCCCCHHCCCCC T ss_conf 26617999726743887400144354527869999708968999999607886588651488479836885311002455 Q ss_pred HHCCEEEECCCC----------------------------CEEEEEEEECCCCC-EEEEECCCCCCCCCHHHHCCCCCCC Q ss_conf 214133421878----------------------------75689997338883-6999417756645114322544413 Q gi|254780353|r 684 GKGVRLQSYKDG----------------------------GISDVICFKICEGL-TWIDSAGRSYNRSENDLLGWLGKRG 734 (753) Q Consensus 684 gkGVk~i~Lkd~----------------------------~~~~~~~~~~~e~~-~il~~t~~g~~k~~~~~~~~~~~Rg 734 (753) T Consensus 712 ~~GV~Gi~L~~~~~v~~~~~~~~i~~~~~D~~~~~L~~NlD~v-v~~~~~~e~~~~lL~vt~nGyGKRt~~~~yr~~~RG 790 (864) T TIGR01063 712 TRGVRGIKLKNEDSVISMTVLKGINSIKEDRNLEELGVNLDFV-VSLEVVSEESQKLLIVTENGYGKRTSIEEYRLQSRG 790 (864) T ss_pred CCCEEEEEECCCCCCCHHHHHHHHHHHHHHHHHHHCCCCEEEE-EEEEEECCCCCEEEEEEECCCCEECCHHHCCCCCCC T ss_conf 6760135406777400013443212002222465437424344-777862499837899830684200426257632656 Q ss_pred CCCCCCCCCCCCCCCEECC Q ss_conf 6660275526776861049 Q gi|254780353|r 735 GVGSLVPKGFPRSGKFLSS 753 (753) Q Consensus 735 gkG~~~~k~~~K~gklV~A 753 (753) T Consensus 791 g~Gv~~~~~~~r~G~vVga 809 (864) T TIGR01063 791 GKGVKSIKITDRNGQVVGA 809 (864) T ss_pred CCEEEEEEEECCCCCEEEE T ss_conf 6237889986468968789

HHsearch alignment for GI: 254780353 and conserved domain: TIGR01063