. "Catalysis of a DNA topological transformation by transiently cleaving one DNA strand at a time to allow passage of another strand; changes the linking number by +1 per catalytic cycle." . . "DNA topoisomerase type I activity" . "topoisomerase" . "deoxyribonucleate topoisomerase" . "DNA topoisomerase I activity" . "nicking-closing enzyme activity" . "omega-protein activity" . "relaxing enzyme activity" . "swivelase activity" . "type I DNA topoisomerase activity" . "type I topoisomerase activity" . "untwisting enzyme activity" . . .