>TIGR01058 parE_Gpos DNA topoisomerase IV, B subunit; InterPro: IPR005740 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 . This entry represents subunit B (parE) of topoisomerase IV from Gram positive bacteria. Topoisomerase IV primarily decatenates DNA and relaxes positive supercoils, which is important in bacteria, where the circular chromosome becomes catenated, or linked, during replication . Topoisomerase IV consists of two polypeptide subunits, parC (subunit A), which is homologous to gyrA of topoisomerase II, and parE (subunit B), which is homologous to gyrB of topoisomerase II. 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, 0005694 chromosome.

Probab=98.10 E-value=8.5e-05 Score=54.11 Aligned_cols=284 Identities=19% Similarity=0.336 Sum_probs=165.3 Q ss_pred CHHHHHHHHHHHHHH----CCCCEEEEEEECCCEEEEEEEECCCCCCHHHHHHHHCCCCCCCCH--HHHHHC-------- Q ss_conf 978999999987772----699679999980984399999888998898999875024665631--244112-------- Q gi|254780399|r 22 RPSIAIKELIENSLD----AESSRVETVIAGGGKSFFQITDNGFGMTSEEIPMAVQRHCTSKIS--DDFSNI-------- 87 (594) Q Consensus 22 ~~~svVkELveNSlD----AgAt~I~v~i~~~g~~~i~V~DnG~Gi~~~dl~~~~~rh~TSKi~--~dl~~i-------- 87 (594) T Consensus 40 GLHHl~wEIvdNsvDEvl~g~a~~I~V~l~~dn--si~V~D~GRG~P~-------~~h~~~~isT~e~vlT~LHAGGKFd 110 (655) T TIGR01058 40 GLHHLVWEIVDNSVDEVLAGYADNITVTLHKDN--SISVQDDGRGIPT-------GIHKQGKISTVETVLTVLHAGGKFD 110 (655) T ss_pred CCHHHHHHHHHHHHHHHHHCCCCEEEEEEECCC--EEEEEECCCCCCC-------CHHCCCCCCCCCEEEEEEECCCCCC T ss_conf 505567878844688898226974799982787--0788757853760-------1221689885100454430773037 Q ss_pred ----C-CCCCCHHHHHHHHHHEE-EEEEEECCCCCCCEEEEE-CCCCC-CCCCCCC----CCCCCEEEEEHHHHHHHHHH Q ss_conf ----1-48840489998762024-899980489863015511-01000-0021101----25675788521012112543 Q gi|254780399|r 88 ----H-TFGFRGEALPSIGAVSH-LTLMSRPPQNNTGAQIAI-SGEKI-SSVRPVA----MNPGTIVEVRDLFFTIPARL 155 (594) Q Consensus 88 ----~-t~GFRGEAL~sIa~vs~-l~i~s~~~~~~~~~~~~~-~~g~~-~~~~~~~----~~~GT~V~V~~LF~N~PvRr 155 (594) T Consensus 111 ~~~YKtaGGLHGVGaSVVNALS~wL~v~v~R-dg~i-Yq~~f~nGGk~~~~lkkIG~tpk~ktGT~v~----F~pDp~~- 183 (655) T TIGR01058 111 QGGYKTAGGLHGVGASVVNALSSWLEVEVKR-DGKI-YQQRFENGGKIVQSLKKIGTTPKKKTGTLVH----FLPDPTI- 183 (655) T ss_pred CCCEEECCCCCCCHHHHHHHCCCCEEEEEEE-CCHH-HHHHHHCCCCEEEEEEECCCCCCCCCCCEEE----ECCCCHH- T ss_conf 8650105732230367764022633899987-8734-4578744791300010204788877773477----5567133- Q ss_pred HCCCCHHHHHHHHHHHHHHHHHCCCCCEEEEEECCCCEEEEECCCCCHHHHHHHHHHHH-HHHHHHHHHCCCCCEEEEEE Q ss_conf 10345368999999999998731899749999879830799717881048999997321-66654310022442036566 Q gi|254780399|r 156 NFLKSEQVETNLITDVIRRMAIAYPKVSFTFSTIKSNRYKMNFQSTNGNFPERISQVIG-EDFINNAVELNEKSNEITLQ 234 (594) Q Consensus 156 kflks~~~e~~~I~~~v~~~aL~~P~V~f~l~~~~~~~~~l~~~~~~~~l~~ri~~i~G-~~~~~~l~~i~~~~~~~~i~ 234 (594) T Consensus 184 --F~~~~F~~n~i~eRL~Es~FLlk~lkl~l~D~~~~~-~~~F~~~~-Gl~~F~~~~Ne~k~~l~~v~~f~ge~~~i~Ve 259 (655) T TIGR01058 184 --FKTTQFNSNIIKERLKESAFLLKKLKLTLTDKRTDK-KTVFFYEN-GLVDFVKYINEEKETLSDVIYFEGEKNGIEVE 259 (655) T ss_pred --HCCCCCCHHHHHHHHHHHHHHHHCCEEEEEEECCCC-EEEEEECC-CHHHHHHHHCCCCEECCCEEEEEECCCCEEEE T ss_conf --302456726787676688887714738999702672-17773004-47899998535500012345887647625899 Q ss_pred EEECCCCCCCCCCHHHHHHHCC-CHH----HCHHHHHHHHHH---HHHHCC---------------CCCCEEEEEEEEEE Q ss_conf 6621611033232066775152-100----075888999987---554427---------------99980799999960 Q gi|254780399|r 235 GYTGIPTFNRGNANQFYVFING-RTV----QDKFILSTIRTA---YAETIP---------------LGRYPVVVLLLEID 291 (594) Q Consensus 235 G~is~P~~~r~~~~~q~ifVNg-R~V----~~~~l~~AI~~a---Y~~~l~---------------~g~~P~~vL~i~i~ 291 (594) T Consensus 260 ~af---Qfnd~~~e~ilSF~N~vkT~eGG~HE~g~k~A~t~v~N~YaRK~~LLKEKDKNleg~diReG--L~avi~v~~P 334 (655) T TIGR01058 260 VAF---QFNDGDSENILSFANSVKTKEGGTHENGFKLAITKVINEYARKVNLLKEKDKNLEGSDIREG--LSAVISVRIP 334 (655) T ss_pred EEE---EECCCCCCEEEEEEEEEEECCCCCCHHHHHHHHHHHHHHHHHHCCCCCCCCCCCCCCHHHHH--HHHEEEEECC T ss_conf 999---74278875379864003406887207889999999986554320011100147871034532--0211553257 Q ss_pred HHHHCCCCCCHHHHHHHCCH--HHHHHHHHHHHHHHHHHCCCC Q ss_conf 65712475711112553597--999999999789887531788 Q gi|254780399|r 292 PRQVDVNVHPAKSYIRFRNP--TIIRNFIIQSIQKAINKKGIS 332 (594) Q Consensus 292 p~~vDVNVHP~K~eVrf~de--~~i~~~i~~~i~~~L~~~~~~ 332 (594) T Consensus 335 E~~~~fEGQ-TK~Kl-f~~ea~~~V~~~v~~~~~~fLeeN~~~ 375 (655) T TIGR01058 335 EELIQFEGQ-TKSKL-FSPEAREVVDEIVEDKLSFFLEENKED 375 (655) T ss_pred HHHCCCCCC-CCCCC-CCHHHHHHHHHHHHHHHHHHHHHHHHH T ss_conf 545245760-57667-876689999999988889999743578

HHsearch alignment for GI: 254780399 and conserved domain: TIGR01058