>TIGR01061 parC_Gpos DNA topoisomerase IV, A subunit; InterPro: IPR005741 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 A (parC) 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, 0006268 DNA unwinding during replication, 0005694 chromosome.

Probab=99.52 E-value=4.9e-14 Score=144.68 Aligned_cols=199 Identities=21% Similarity=0.311 Sum_probs=167.7 Q ss_pred EEEEEECCC-CEEEECHHHHHHCCCCCEEEEEECCCCEEEEEEECCCCCEEEEEECCCEEEEEEHHHCCCCCCCCCCCE- Q ss_conf 799994799-189842368620477722786615898578889618982699993698599975876235478665535- Q gi|254780182|r 647 YVVFATKHG-NVRRNKLSDFIQINRSGKIAMKLDSRDEILSVETCTQENDILLTTKLGQCVRFPISAIRVFAGRNSVGV- 724 (910) Q Consensus 647 ~Lvl~Tk~G-~VKkt~l~ef~~~r~~G~~aikLkegD~Li~v~~~~~~~~Iil~T~~G~~lrF~~~evr~~~GR~a~GV- 724 (910) T Consensus 499 ~~v~itk~GnY~K~~S~~sf~ss---~~~d~g~~~~d~l~~~~~~nttd~lL~~Ts~g~~In~pvh~La~~-rwkd~g~h 574 (745) T TIGR01061 499 LYVVITKDGNYIKRTSKRSFASS---KYDDFGLKDDDILFYQTIANTTDKLLIFTSKGNLINLPVHKLADI-RWKDLGEH 574 (745) T ss_pred CEEEEEECCCEEHHHHHHHHHHC---CCCCCCCCCCHHHHHHHHHHCCCEEEEEECCCCEEEEEEEECCCC-CHHHHHHH T ss_conf 40799844763000126676204---731157755334535465212253788761666642130314566-56689987 Q ss_pred --EEEE-CCCCCEEEEEEEECCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCHHHHCCCCCCCEEE Q ss_conf --7675-2899869998973366654200000122233333334555444444443332222232001110125686799 Q gi|254780182|r 725 --RGIS-LAKGDQVISMAIVLHADADYDERICYMKHMSAQRRLISGDTEEITSLKNDSSVEGNISEERCQELKLKEQFIL 801 (910) Q Consensus 725 --kgIk-L~~~D~Vv~~~vi~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~e~~~~~~~~~~~IL 801 (910) T Consensus 575 ls~~~~n~~~~E~iv~v~~~~~fdv-------------------------------------------------~~~~L~ 605 (745) T TIGR01061 575 LSNKITNFDENETIVAVEILNEFDV-------------------------------------------------DEAILV 605 (745) T ss_pred HCCHHHHHHCCCCEEEEEEECCCCC-------------------------------------------------CHHHHH T ss_conf 2000110210684899986132257-------------------------------------------------468989 Q ss_pred EEECCCCEEEEEHHHCCCCCC-CCCCEEEEECCCCCCCCCEEEEEECCC--CCEEEEEECCCEEEEEECCCCCCCCCCCC Q ss_conf 997599345301788486675-774148876067777686899997289--96499994599899999010554451568 Q gi|254780182|r 802 TVSEKGFGKRTSSYDFRISNR-SGKGIRATDVSKINEIGALVAVFPVND--NDQIILVSDKGTLIRVPVNEIRIASRATK 878 (910) Q Consensus 802 ~vTe~G~GKRt~~~eyr~q~R-GgkGv~~ik~~~~n~~g~lv~~~~V~~--~DeIlliT~~G~iiR~~v~~I~~~gR~a~ 878 (910) T Consensus 606 l~sklg~vKriel~~l~~~~~y~sK~~~~~~L~D~---d~li~a~~~~~Gh~~~i~lvS~~gy~l~F~~~Ei~~~~~~A~ 682 (745) T TIGR01061 606 LASKLGMVKRIELTELDIKRNYRSKAILILKLKDE---DELISAFLQKKGHDKLIILVSKLGYALLFLVEEINVVGAKAA 682 (745) T ss_pred HHHHCCCEEEEECCCCCCCCCCHHHHHHHHHCCCC---CCEEEEEEECCCCCCEEEEEEECCCEEEECCEEECCCCCCCC T ss_conf 98755874787603247786510122332111789---543899984188844189997368357730203323144667 Q ss_pred CCEEEEECCCCEEEEEEEECCCC Q ss_conf 73889808998799999835665 Q gi|254780182|r 879 GVVIFSTAKDERVVSVERIRESE 901 (910) Q Consensus 879 GV~i~~L~~~D~Vv~va~i~~~e 901 (910) T Consensus 683 GvK~mkLK~~D~v~~~~i~~~~~ 705 (745) T TIGR01061 683 GVKGMKLKEDDEVKSGLILEANE 705 (745) T ss_pred CEEEEECCCCCEEEEEEEECCCC T ss_conf 31133057676389999982799

HHsearch alignment for GI: 254780182 and conserved domain: TIGR01061