DNA gyrase negatively supercoils closed circular double- stranded DNA in an ATP-dependent manner and also catalyzes the interconversion of other topological isomers of double-stranded DNA rings, including catenanes and knotted rings. GYRA_STAEP DNA gyrase subunit A (Fragment) gyrA MAELPQSRINERNITSEMRESFLDYAMSVIVSRALPDVRDGLKPVHRRILYGLNEQGMTPDKPYKKSARIVGDVMGKYHPHGDSSIYEAMVRMA 94