https://www.ncbi.nlm.nih.gov/Structure/cdd/cd00822
cd00822 (PSSM ID: 238419): Conserved Protein Domain Family TopoII_Trans_DNA_gyrase, TopoIIA_Trans_DNA_gyrase: Transducer domain, having a ribosomal S5 domain...
conserved proteindna gyrasecdddomainfamily
https://www.profoldin.com/page/page/5614257.htm
Fluorescence-based high throughput assays are available for DNA gyrase supercoiling activity and other DNA topoisomerase activities
dna gyraseassaykits