| IPR001631 | DNA topoisomerase I |
| IPR008336 | DNA topoisomerase I, DNA binding, eukaryotic-type |
| IPR011010 | DNA breaking-rejoining enzyme, catalytic core |
| IPR013030 | DNA topoisomerase I, DNA binding, N-terminal domain 2 |
| IPR013034 | DNA topoisomerase I, DNA binding, N-terminal domain 1 |
| IPR013499 | DNA topoisomerase I, eukaryotic-type |
| IPR013500 | DNA topoisomerase I, catalytic core, eukaryotic-type |
| IPR014711 | DNA topoisomerase I, catalytic core, alpha-helical subdomain, eukaryotic-type |
| IPR014727 | DNA topoisomerase I, catalytic core, alpha/beta subdomain |
| IPR018521 | DNA topoisomerase I, active site |
| IPR025834 | Topoisomerase I C-terminal domain |