| IPR011773 | DNA-directed RNA polymerase, alpha subunit | Family |
| IPR011262 | DNA-directed RNA polymerase, insert domain | Domain |
| IPR011260 | RNA polymerase, alpha subunit, C-terminal | Domain |
| IPR011263 | DNA-directed RNA polymerase, RpoA/D/Rpb3-type | Domain |
| IPR036643 | DNA-directed RNA polymerase, insert domain superfamily | Homologous Superfamily |
| IPR036603 | RNA polymerase, RBP11-like subunit | Homologous Superfamily |
| IPR025249 | KH domain, NusA-like | Domain |
| IPR036555 | NusA, N-terminal domain superfamily | Homologous Superfamily |
| IPR003029 | S1 domain | Domain |
| IPR013735 | Transcription factor NusA, N-terminal | Domain |
| IPR030842 | Transcription termination/antitermination protein NusA, bacterial | Family |
| IPR010213 | Transcription termination factor NusA | Domain |
| IPR009019 | K homology domain superfamily, prokaryotic type | Homologous Superfamily |
| IPR010214 | Transcription termination factor NusA, C-terminal duplication | Repeat |
| IPR015946 | K homology domain-like, alpha/beta | Homologous Superfamily |
| IPR012340 | Nucleic acid-binding, OB-fold | Homologous Superfamily |
| IPR010995 | DNA repair Rad51/transcription factor NusA, alpha-helical | Homologous Superfamily |