Protein
Topoisomerase subunit TopoN
Organism
Mycobacterium smegmatis (strain ATCC 700084 / mc(2)155)
Function
Catalyzes the relaxation of negatively supercoiled DNA in the presence of ATP or dATP but not other nucleotides. Individual subunits have no activity. Not able to negatively supercoil DNA, it can however introduce positive supercoils in DNA. Relaxes positive supercoils in an ATP-dependent manner. Catenates and decatenates DNA. Generates dsDNA breaks in the presence of the quinolone antibiotic ciprofloxacin, showing it is a topoisomerase.
Similarity
Belongs to the type II topoisomerase family.
Sequence
MSDPASTIPPAHHPTFWRERAVSYTAADITELDDVQHTRLRPAVNLGLDVLNTALREIVDNAIEEVADPGHGGSTVTITLHADGSVSVADDGRGLPVDTDPTTGKNGIVKTLGTARAGGKFSAHKDATSTGAGLNGIGAAAAVFISARTDVTVRRDGKTFLQSFGRGYPGVFEGKEFDPEAPFTRNDTQKLRGVSNRKPDLHGTEVRILFDPAIAPDSTLDIGEVLLRAHAAARMSPGVHLVVVDEGWPGEEVPPAVLEPFSGPWGTDTLLDLMCTAAGTPLPEVRAVVEGRGEYTTGRGPTPFRWSLTAGPAEPATVAAFCNTVRTPGGGSHLTAAIKGLSEALAERASRMRDLGLAKNEEGPEPQDFAAVTALAVDTRAPDVAWDSQAKTAVSSRSLNLAMAPDVARSVTIWAANPANADTVTLWSKLALESARARRSAEGAKARARAASKAKGLGTNLSLPPKLLPSRESGRGSGAELFLCEGDSALGTIKAARDATFQAAFPLKGKPPNVYGFPLNKARAKDEFDAIERILGCGVRDHCDPELCRYDRILFASDADPDGGNINSSLISMFLDFYRPLVEAGMVYVTMPPLFVVKAGDERIYCQDESERDAAVAQLKASSNRRVEVQRNKGLGEMDADDFWNTVLDPQRRTVIRVRPDESEKKLHHTLFGGPPEGRRTWMADVAARVDTSALDLT