| ADPNP | 5′-adenylyl-β,γ-imidotriphosphate |
| CTD | C-terminal domain (of GyrA) |
| FRET | Förster resonance energy transfer |
| GHKL | GyrB-Hsp90-histidine/serine protein kinases-MutL |
| G-segment | gate segment |
| GyrA | GyrA subunit of gyrase |
| GyrB | GyrB subunit of gyrase |
| GyrBA | GyrB-GyrA fusion protein |
| NTD | N-terminal domain (of GyrA) |
| sc | supercoil |
| topo | topoisomerase |
| TOPRIM | topoisomerase-primase |
| T-segment | transport segment |
| WHD | winged-helix domain |
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